Updated on 2024/11/18

Information

 

写真a

 
IKIRU ATSUTA
 
Organization
Faculty of Dental Science Department of Dental Science Professor
Title
Professor
Tel
0926426441
Profile
Aim of our research: The dental implant treatment has emerged as most important prosthetic therapy option for completely and partially edentulous patients. However, it is a current state that a lot of unsettled matters have been left as for the adhesive mechanism of Peri-implant epithelium and the implant body. Therefore, this research will clarify these matters.
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Research Areas

  • Life Science / Prosthodontics

Degree

  • DDS

Research History

  • Faculty of Dental Science, Kyushu University Division of Advanced Dental Devices and Therapeutics Associate Plofessor 

    2019 - Present

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    Country:Japan

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Research Interests・Research Keywords

  • Research theme: 間葉系幹細胞

    Keyword: 間葉系幹細胞

    Research period: 2024

  • Research theme: 口腔粘膜上皮

    Keyword: 口腔粘膜上皮

    Research period: 2024

  • Research theme: 再生

    Keyword: 再生

    Research period: 2024

  • Research theme: インプラント

    Keyword: インプラント

    Research period: 2024

  • Research theme: Injection timing of Mesenchymal Stem Cells to promote the soft tissue sealing around titanium implant

    Keyword: Mesenchymal stem cells, Dental implant, Epithelial cell, Titanium, Adhesion molecule

    Research period: 2012.4 - 2014.4

  • Research theme: Complete denture research

    Keyword: Complete denture

    Research period: 2011.4 - 2018.6

  • Research theme: Re-generation of Peri-implant epithelium

    Keyword: implant epithelium re-generation

    Research period: 2000.10

Awards

  • 優秀発表者(共同)

    2022.9   第52回日本口腔インプラント学会学術大会  

  • 優秀発表者(共同)

    2022.9   第52回日本口腔インプラント学会学術大会  

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  • 最優秀発表賞(共同)

    2021.12   日本歯科理工学会九州地方会冬期セミナー  

  • 優秀研究者賞(IF部門)(共同)

    2021.2   九大歯学  

  • 優秀研究発表賞(共同)

    2020.11   日本歯科理工学会九州地方会秋期セミナー  

  • 2019年度デンツプライシロナ賞

    2019.6   公益社団法人日本補綴歯科学会  

  • The 10 Best E-poster Presentation (Copresentater)

    2019.3   Academy of Osseointegration  

  • 優秀研究発表賞(共同)

    2017.9   日本口腔インプラント学会  

  • デンツプライシロナ賞(共同)

    2017.7   日本補綴歯科学会  

  • 奨励論文賞(共同)

    2016.6   日本補綴歯科学会  

  • 奨励論文賞(共同)

    2015.6   日本補綴歯科学会  

  • 第42回日本口腔インプラント学会学術大会デンツプライ賞

    2013.9   日本口腔インプラント学会学術大会  

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    1. インシュリン様成長因子-Iを用いたインプラント周囲における上皮封鎖性の向上

  • 優秀研究発表賞

    2012.9   第42回公益社団法人日本口腔インプラント学会学術大会  

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    インシュリン様成長因子-Iを用いたインプラント周囲における上皮封鎖性の向上.

  • 優秀研究発表賞

    2008.9   第38回日本口腔インプラント学会学術大会  

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    2. プラットホームスイッチングシステムは上皮封鎖性の向上に有効か?

  • 課題口演コンペティション優秀賞

    2006.7   日本補綴歯科学会  

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    インプラント表面への口腔上皮細胞の接着に対するIGF-Iの効果

  • Best Poster Presentation Award

    2006.4   The 2006 Annual Scientific Meeting of the Korean Academy of Prosthodontics and 3rd Joint Academic Meeting with Japan Prosthodontic Society, Seoul  

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    Role of PI3-kinase on adhesion of oral epitherial cells to titanium.

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Papers

  • Soft tissue sealing around dental implants based on histological interpretation. Reviewed International journal

    熱田 生

    J Prosthodont Res   2016.1

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Therapeutic interaction of systemically-administered mesenchymal stem cells with peri-implant mucosa. Reviewed International journal

    熱田 生

    PLoS One   2014.5

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    Language:English   Publishing type:Research paper (scientific journal)  

  • 間葉系幹細胞を用いてインプラント周囲における上皮封鎖性は改善出来るか?

    熱田 生

    日本補綴歯科学会誌第6巻1号   2014.4

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    Language:Japanese  

  • The role of phosphoinositide 3-kinase in adhesion of oral epithelial cells to titanium

    ATSUTA IKIRU, Yasunori AYUKAWA, kiyoshi koyano

    ARCHIVES OF ORAL BIOLOGY   58 ( 11 )   2013.11

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    Language:English  

    DOI: 10.1016/j.archoralbio.2013.07.013

  • IL-17-mediated M1/M2 macrophage alteration contributes to pathogenesis of bisphosphonate-related osteonecrosis of the jaws. International journal

    ATSUTA IKIRU

    Clin Cancer Res.   2013.5

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Mesenchymal stem cells inhibit multiple myeloma cells via the Fas-L/Fas pathway International journal

    ATSUTA IKIRU

    Stem Cell Res Ther   2013.4

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Promotive effect of insulin-like growth factor-1 for epithelial sealing to titanium implants Reviewed International journal

    ATSUTA IKIRU

    2013.4

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Expression of Integrin beta-4 and alpha-3 subunits on the process of peri-implant epithelium formation International journal

    Ikiru Atsuta, Yasunori Ayukawa, Takayoshi Yamaza, Akihiro Furuhashi, Ryosuke Kondo, Kiyoshi Koyano

    2013.3

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  • In vivo and in vitro studies of epithelial cell behavior around titanium implants with machined- and rough-surface.

    ATSUTA IKIRU

    2013.1

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    Language:English  

  • Evaluations of epithelial sealing and peri-implant epithelial down-growth around “step-type” implants Reviewed International journal

    ATSUTA IKIRU

    2012.9

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    Language:English   Publishing type:Research paper (scientific journal)  

  • インプラント周囲の軟組織構造はどこまで解明されているのか?

    熱田 生・鮎川保則・古谷野 潔

    歯界展望   114巻 ( 2号 )   2009.8

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    Language:Japanese  

  • Ultrastructural localization of laminin-5 (gamma2 chain) in the rat peri-implant oral mucosa around a titanium-dental implant by immuno-electron microscopy.

    I.Atsuta

    2008.5

  • Changes in the distribution of laminin-5 during peri-implant epithelium formation after immediate titanium implantation in rats.

    ATSUTA IKIRU

    1900

  • Synergistic Effect of Nano Strontium Titanate Coating and Ultraviolet C Photofunctionalization on Osteogenic Performance and Soft Tissue Sealing of poly(ether-ether-ketone)

    Tianjie Chen, Yohei Jinno, Ikiru Atsuta, Akira Tsuchiya, Sora Obinata, Riku Iimori, Takashi Kimura, Yasunori Ayukawa

    ACS Biomaterials Science and Engineering   10 ( 2 )   825 - 837   2024.2

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    Language:Others   Publishing type:Research paper (scientific journal)  

    This study aimed to evaluate the bioactivity of poly(ether ether ketone) (PEEK) after surface modification by persistent photoconductive strontium titanate (SrTiO3) magnetron sputtering and ultraviolet (UV) C irradiation. According to the different modifications, the PEEK specimens were randomly divided into five groups (n = 38/group): PEEK, Sr100-PEEK, Sr200-PEEK, UV/PEEK, and UV/Sr200-PEEK. Then, the specimens of Sr100-PEEK and Sr200-PEEK groups were, respectively, coated with 100 and 200 nm thickness photocatalyst SrTiO3 on the PEEK surface by magnetron sputtering. Subsequently, UV-C light photofunctionalized the specimens of PEEK and Sr200-PEEK groups to form UV/PEEK and UV/Sr200-PEEK groups. The specimens were characterized by a step meter, scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDX), and a water contact angle meter. The release test of the Sr ion was performed by inductively coupled plasma mass spectrometry (ICP-MS). In vitro study, osteogenic activity (MC3T3-E1 osteoblast-like cells) and epithelial and connective tissue attachment (gingival epithelial cells GE1 and fibroblasts NIH3T3) were analyzed in five groups. Surface morphology of the specimens was changed after coating, and the Sr content on the Sr-PEEK surface was increased with increasing coating thickness. In addition, the contact angle was increased significantly after magnetron sputtering. After UV-C photofunctionalization, the content of surface elements changed and the contact angle was decreased. The release of Sr ion was sustained, and the final cumulative release amount did not exceed the safety limit. In vitro experiments showed that SrTiO3 improved the cell activity of MC3T3-E1 and UV-C irradiation further enhanced the osteogenic performance of PEEK. Besides, UV-C irradiation also significantly promoted the cell viability, development, and expression of adhesion proteins of GE1 and NIH3T3 on PEEK. The present investigation demonstrated that nano SrTiO3 coating with UV-C photofunctionalization synergistically enhanced the osteogenic properties and soft tissue sealing function of PEEK in vitro.

    DOI: 10.1021/acsbiomaterials.3c01684

  • Current surface modification strategies to improve the binding efficiency of emerging biomaterial polyetheretherketone (PEEK) with bone and soft tissue: A literature review.

    Tianjie Chen, Yohei Jinno, Ikiru Atsuta, Akira Tsuchiya, Michele Stocchero, Eriberto Bressan, Yasunori Ayukawa

    Journal of prosthodontic research   67 ( 3 )   337 - 347   2023.7

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    Language:English  

    PURPOSE: The aim of this study was to review the literature on current surface modification strategies used to improve the binding efficiency of an emerging biological material, polyetheretherketone (PEEK), with bone and soft tissues. STUDY SELECTION: This review was based on articles retrieved from PubMed, Google Scholar, Web of Science, and ScienceDirect databases. The main keywords used during the search were "polyetheretherketone (PEEK)," "implant," "surface modification," "biomaterials," "bone," "osseointegration," and "soft tissue." RESULTS: The suitability of PEEK surface modification strategies has been critically analyzed and summarized here. Many cell and in vivo experiments in small animals have shown that the use of advanced modification technologies with appropriate surface modification strategies can effectively improve the surface inertness of PEEK, thereby improving its binding efficiency with bone and soft tissues. CONCLUSIONS: Surface modifications of PEEK have revealed new possibilities for implant treatment; however, most results are based on in vitro or short-term in vivo evaluations in small animals. To achieve a broad application of PEEK in the field of oral implantology, more in vivo experiments and long-term clinical evaluations are needed to investigate the effects of various surface modifications on the tissue integration ability of PEEK to develop an ideal implant material.

    DOI: 10.2186/jpr.JPR_D_22_00138

  • Promotional Effect and Molecular Mechanism of Synthesized Zinc Oxide Nanocrystal on Zirconia Abutment Surface for Soft Tissue Sealing. International journal

    J Hu, I Atsuta, Y Luo, X Wang, Q Jiang

    Journal of dental research   102 ( 5 )   505 - 513   2023.5

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    Studies have confirmed that tooth loss is closely related to systemic diseases, such as obesity, diabetes, cardiovascular diseases, some types of tumors, and Alzheimer's disease. Among many methods for tooth restoration, implant restoration is the most commonly used method. After implantation, long-term stability of implants requires not only good bone bonding but also good soft tissue sealing between implants and surrounding soft tissues. The zirconia abutment is used in clinical implant restoration treatment, but due to the strong biological inertia of zirconia, it is difficult to form stable chemical or biological bonds with surrounding tissues. In this study, we investigated synthesized zinc oxide (ZnO) nanocrystal on the zirconia abutment surface by the hydrothermal method to make it more beneficial for soft tissue early sealing and the molecular mechanism. In vitro experiments found that different hydrothermal treatment temperatures affect the formation of ZnO crystals. The crystal diameter of ZnO changes from micron to nanometer at different temperatures, and the crystal morphology also changes. In vitro, scanning electron microscopy, energy dispersive spectrometry, and real-time polymerase chain reaction results show that ZnO nanocrystal can promote the attachment and proliferation of oral epithelial cells on the surface of zirconia by promoting the binding of laminin 332 and integrin β4, regulating the PI3K/AKT pathway. In vivo, ZnO nanocrystal ultimately promotes the formation of soft tissue seals. Collectively, ZnO nanocrystal can be synthesized on a zirconia surface by hydrothermal treatment. It can help to form a seal between the implant abutment and surrounding soft tissue. This method is beneficial to the long-term stability of the implant and also can be applied to other medical fields.

    DOI: 10.1177/00220345221150161

  • Reconsideration of Soft Tissue Sealing around Dental Implants

    ATSUTA Ikiru, KOYANO Kiyoshi, AYUKAWA Yasunori

    Journal of Japanese Society of Oral Implantology   36 ( 1 )   32 - 38   2023.3   ISSN:09146695 eISSN:21879117

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    Language:Japanese   Publisher:Japanese Society of Oral Implantology  

    <p>Oral implant treatment has become an important prosthetic option for defects. Osseointegration is important for the implant body to function in the oral cavity, but soft tissue sealing is essential for long-term functioning. The mechanism of sealing around the implant is similar in structure to the biological widths around natural teeth, but its performance is clearly lower. Due to the anatomical lack of blood flow around the implant, the amount of adhesion-related protein that intervenes histologically with the implant body is small, and epithelial cells adhere weakly to titanium. To improve the soft tissue sealing around the implant, research on the material of the implant body, the surface texture, and the cell activity of the surrounding tissue is still under way. We believe that these considerations affect the prognosis of implant treatment, and that maintenance considering soft tissue clearly extends the life of the implant.</p>

    DOI: 10.11237/jsoi.36.32

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  • Evaluation of carbonate apatite as a bone substitute in rat extraction sockets from the perspective of mesenchymal stem cells

    Ryosuke TAKAHASHI, Ikiru ATSUTA, Ikue NARIMATSU, Takayoshi YAMAZA, Xiaoxu ZHANG, Yuki EGASHIRA, Kiyoshi KOYANO, Yasunori AYUKAWA

    Dental Materials Journal   42 ( 2 )   282 - 290   2023   ISSN:0287-4547 eISSN:1881-1361

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society for Dental Materials and Devices  

    Carbonate apatite (CO3Ap) is a major inorganic bone component and an effective bone substitute. To clarify the function of CO3Ap, we compared differences among CO3Ap, hydroxyapatite (HAp), and β-tricalcium phosphate (β-TCP) by focusing on mesenchymal stem cells (MSCs) that have a role in wound healing. For in vivo experiments, maxillary molars were removed and the bone substitute was inserted. MSC accumulation around extraction sockets was significantly promoted in CO3Ap and β-TCP groups. For in vitro experiments, MSCs were cultured with bone substitutes. The differentiation potential and amount of calcium deposition were significantly lower in CO3Ap and HAp groups than in the β-TCP group. Increases in insulin-like growth factor-I and vascular endothelial growth factor were found only in the CO3Ap group. CO3Ap-filled extraction sockets accumulated MSCs, and MSCs cultured in the presence of CO3Ap produced large amounts of growth factors. These results suggest that CO3Ap promotes healing of tooth extraction sockets.

    DOI: 10.4012/dmj.2022-040

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  • Synergistic Effect of Carbonate Apatite and Autogenous Bone on Osteogenesis International journal

    Ikiru Atsuta, Tokihisa Mizokami, Yohei Jinno, Bin Ji, Tingyu Xie, Yasunori Ayukawa

    Materials   15 ( 22 )   2022.11

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    Bone augmentation using artificial bone is an important option in dental defect prostheses. A bone substitute using carbonate apatite (CO3Ap), an inorganic component of bone, was reported to have promising bone formation and bone replacement ability. However, the osteoinductivity of artificial bone is less than autogenous bone (AB). In this study, CO3Ap with AB is demonstrated as a clinically effective bone substitute. For in vitro experiments, an osteoclast-like cell (RAW-D) was cultured in the presence of AB, CO3Ap, or both (Mix), and the number of osteoclasts was evaluated. Osteoblasts were also cultured under the same conditions, and the number of adherent cells was evaluated. For in vivo experiments, a few holes were created in the rat tibia and AB, CO3Ap, or Mix were added. At 0, 14, and 21 days, the tissue morphology of the wound area was observed, and the thickness of the cortical bone was measured. In vitro, Mix did not increase the number of osteoclasts or osteoblasts. However, in vivo, the rate of bone replacement remarkably increased with Mix on dome-shape. A bone-grafting material combining osteoinductive AB with abundant artificial bone is expected to be clinically easy to use and able to form bone.

    DOI: 10.3390/ma15228100

  • Oral Health-Related Quality of Life Changes after Clinical Remounting of Existing Dentures. International journal

    Chi-Hsiang Cheng, Ikiru Atsuta, Kiyoshi Koyano, Yasunori Ayukawa

    Healthcare (Basel, Switzerland)   10 ( 10 )   2022.10

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    The clinical remount is an accurate and efficient way to reset the occlusion of delivered removable dentures if major occlusal correction is required. Although previous studies have reported that clinical remounting of existing dentures enhances patients' oral function, little subjective feedback is available. This retrospective study reports short-term changes in oral-health-related quality of life (OHRQoL) and masticatory function after clinical remounting of existing dentures. Three time points were defined: before adjustment (T0), immediately after adjustment (T1), and 1 week after adjustment (T2). The medical records of seven patients were analyzed. The mean age of participants was 77.71 years, and the mean service period of their prostheses was 9.43 months. The mean scores of the OHIP-EDENT-J questionnaire at the respective time points were 35, 21.14, and 22.14. The mean readings of masticatory function at the respective time points were 76.71, 89.29, and 111.86. Significant differences in the OHIP-EDENT-J were found between T0 and T1, and T0 and T2; and in masticatory function between T1 and T2, and T0 and T2. The results indicated that after rebalancing of the occlusion of the existing dentures, the patient-reported OHRQoL was improved immediately and maintained at least for a short time, and masticatory function was enhanced over a 1-week period.

    DOI: 10.3390/healthcare10101960

  • The effect of oral appliances on sleep bruxism and temporomandibular disorders: A randomized controlled trial

    OKI Kyosuke, OHO Kohei, TSUKIYAMA Yoshihiro, ATSUTA Ikiru, KANEKO Megumi, AYUKAWA Yasunori, KOYANO Kiyoshi

    Journal of the Japanese Society for the Temporomandibular Joint   34 ( 2 )   38 - 48   2022.8   ISSN:09153004 eISSN:18844308

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    Language:Japanese   Publisher:The Japanese Society for Temporomandibular Joint  

    <p>Oral appliances (OA) are widely used in daily clinical practice as a reversible and conservative therapy for masticatory muscle pain and sleep bruxism (SB). However, there is insufficient evidence for their therapeutic effect. Hence, the objectives of this randomized clinical trial were to clarify the effects of OA on masticatory muscle pain and SB activity. Sixteen patients who were referred to the TMD clinic at Kyushu University Hospital with masticatory muscle pain and SB participated in this study. They were randomly allocated to either the splint group, who wore OA during sleep, or the control group. Electromyographic activity of the masseter muscle during sleep was recorded at baseline, immediately after, and 1, 4, and 6 weeks after the insertion of OA. At baseline and 6 weeks after starting the treatment, masticatory muscle pain was evaluated by a visual analog scale and muscle palpation, and Oral Health Impact Profile-49 (OHIP-49) scores were recorded. There were statistically significant differences in the muscle palpation index and OHIP-49 total score between the OA and control groups. There was a significant reduction in SB events immediately after wearing OA, but no change at 1, 4, or 6 weeks after starting the treatment. A simple correlation between SB activity and pain parameters was not found. In conclusion, OA had positive effects on both masticatory muscle pain and SB, but effects on SB were transient.</p>

    DOI: 10.11246/gakukansetsu.34.38

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  • Therapeutic Effect of Benidipine on Medication-Related Osteonecrosis of the Jaw. International journal

    Ken Matsunaka, Mikio Imai, Koma Sanda, Noriyuki Yasunami, Akihiro Furuhashi, Ikiru Atsuta, Hiroko Wada, Yasunori Ayukawa

    Pharmaceuticals (Basel, Switzerland)   15 ( 8 )   2022.8

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    Medication-related osteonecrosis of the jaw (MRONJ) is an intractable disease that is typically observed in patients with osteoporosis or tumors that have been treated with either bisphosphonate (BP) or antiangiogenic medicine. The mechanism of MRONJ pathogenesis remains unclear, and no effective definitive treatment modalities have been reported to date. Previous reports have indicated that a single injection of benidipine, an antihypertensive calcium channel blocker, in the vicinity of a tooth extraction socket promotes wound healing in healthy rats. The present study was conducted to elucidate the possibility of using benidipine to promote the healing of MRONJ-like lesions. In this study, benidipine was administered near the site of MRONJ symptom onset in a model rat, which was then sacrificed two weeks after benidipine injection, and analyzed using histological sections and CT images. The analysis showed that in the benidipine groups, necrotic bone was reduced, and soft tissue continuity was recovered. Furthermore, the distance between epithelial edges, length of necrotic bone exposed in the oral cavity, necrotic bone area, and necrotic bone ratio were significantly smaller in the benidipine group. These results suggest that a single injection of benidipine in the vicinity of MRONJ-like lesions can promote osteonecrotic extraction socket healing.

    DOI: 10.3390/ph15081020

  • 睡眠時ブラキシズムを有する顎関節症患者へ用いたオーラルアプライアンスの効果に関するランダム化比較試験

    大木 郷資, 大穂 耕平, 築山 能大, 熱田 生, 金子 めぐみ, 鮎川 保則, 古谷野 潔

    日本顎関節学会雑誌   34 ( 2 )   38 - 48   2022.8   ISSN:0915-3004

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    Language:Japanese   Publisher:(一社)日本顎関節学会  

    オーラルアプライアンス(OA)は,顎関節症(TMD)および睡眠時ブラキシズム(SB)の治療に広く用いられているが,そのエビデンスは不十分である。そこで本研究では,ランダム化比較試験によりOAの治療効果を調査し,TMDとSBの相互関係を調べることを目的とした。九州大学病院を受診したTMD患者のうち,咀嚼筋痛およびSBを有する者16名を対象として,OA装着群と非装着群(各8名)に無作為割付を行った。各群において6週間にわたり咀嚼筋痛の程度,口腔関連QoL(Oral Health Impact Profile-49,OHIP-49),SB(携帯型筋電図)の記録を行い,比較検討した。また,治療効果に関連する因子とそれらの関与程度を調査するため,心理学的因子とダイアリーの記録を行った。咀嚼筋痛に関して,VASによる痛みの主観的評価では群間に有意差は認められなかったが,筋圧痛スコアおよびOHIP-49スコアにおいてはOA装着群のほうが有意に改善していた。また,SBはOA装着直後において有意に減少したが,1,4,6週後には差はみられなかった。SBと咀嚼筋痛との間に相関関係は認められなかった。OA治療は,咀嚼筋痛の緩和に有効であること,また1週間程度ではあるがSBの減弱にも効果があることが明らかとなった。(著者抄録)

  • Hypothetical Model of How a Clinical Remount Procedure Benefits Patients with Existing Dentures: A Narrative Literature Review. International journal

    Chi-Hsiang Cheng, Ikiru Atsuta, Kiyoshi Koyano, Yasunori Ayukawa

    Healthcare (Basel, Switzerland)   10 ( 6 )   2022.6

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    The clinical remount procedure, which involves remounting the dentures on an articulator with interocclusal records, can effectively reduce occlusal discrepancies. This procedure can be applied not only to new dentures but also to those already in service; however, research in this field is still scarce. This narrative review aims to establish a hypothetical mechanism and possible indications and contraindications for this technique as a basis for further research. Current studies have revealed a high prevalence of malocclusion in delivered dentures. Performing a clinical remount on these existing dentures would enhance the oral function of the denture wearer and would enable effective and accurate correction of the accumulated errors in the jaw relationship in a stable working environment. This technique should be performed if a patient has poor masticatory function or occlusion-related complaints. However, performing a clinical remount on dentures with an excessive anterior-posterior discrepancy between the centric relation and the maximal intercuspal position or on dentures with extremely low occlusal vertical dimension, is considered less effective. The clinical remount procedure remains an essential skill both for fabricating quality dentures and maintaining those already in service.

    DOI: 10.3390/healthcare10061067

  • Oral Function Rehabilitation with the Simplified Lauritzen Clinical Remount Technique in a Patient with Bimaxillary Alveolar Exostoses: A Case Report. International journal

    Chi-Hsiang Cheng, Ikiru Atsuta, Yuki Egashira, Kiyoshi Koyano, Yasunori Ayukawa

    Healthcare (Basel, Switzerland)   10 ( 4 )   2022.4

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    This case report describes a 70 year-old man with IVA lung cancer who required oral function rehabilitation by fabricating dentures with a simplified clinical remount technique. A pair of dentures were fabricated for a 70-year-old man with stage IVA lung cancer. Due to severe bimaxillary exostoses, the dentures could not properly extend and achieve a peripheral seal. The treatment philosophy was to stabilize the dentures and achieve proper function with optimized occlusion. The simplified Lauritzen clinical remount technique was performed at the time of denture delivery and 3 months later. After the second clinical remount procedure, the patient was able to eat meals with the dentures and maintained in a stable condition. Compared with the original technique, the simplified Lauritzen clinical remount omits the facebow transfer and keeps the condylar guidance setting and the Bennett angle unchanged during the adjustment. The prostheses are mounted to a type 3, non-arcon type articulator with anterior stop screws attached to the bilateral condylar parts. With the aid of anterior stop screws, the eccentric movement of dentures can be differentiated on a millimeter scale and balanced easily. It is effective to use occlusal-optimized dentures and the clinical remount technique, especially in difficult cases.

    DOI: 10.3390/healthcare10040682

  • Effect of carbonate apatite as a bone substitute on oral mucosal healing in a rat extraction socket: in vitro and in vivo analyses using carbonate apatite. International journal

    Yuki Egashira, Ikiru Atsuta, Ikue Narimatsu, Xiaoxu Zhang, Ryosuke Takahashi, Kiyoshi Koyano, Yasunori Ayukawa

    International journal of implant dentistry   8 ( 1 )   11 - 11   2022.3

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    BACKGROUND: Low bone quantity and quality are serious problems that affect the prognosis of implants in the cosmetic field. Therefore, artificial bone substitutes are frequently used. However, whether there is a difference in the effect of either bone substitute on soft tissue healing is unclear given their greatly different absorbability. In this study, we used hydroxyapatite (HAp) and carbonate apatite (CO3Ap) as bone substitutes to analyze the epithelial and connective tissue healing after tooth extraction. METHODS: In vitro, oral mucosa-derived epithelial cells (OECs) collected from 4-day-old Wistar rats were seeded on HAp or CO3Ap and evaluated for adhesion, proliferation, migration, apoptosis, and morphology. Fibroblasts (FBs) were also analyzed for their ability to express collagen. In vivo, the extraction of maxillary right first (M1) and second molars (M2) of 6-week-old male Wistar rats was performed, followed by insertion of HAp or CO3Ap granules into the M1 and M2 sites. The oral mucosal healing process was then evaluated histochemically after 7 and 14 days. RESULTS: In vitro, high collagen expression by FBs in the CO3Ap group was observed and the surface analysis showed spreading of the FBs on the CO3Ap surface. However, the activity of OECs was suppressed on CO3Ap. Two weeks after CO3Ap implantation, soft tissue healing was observed, and recovery of the connective tissue was observed on the remaining CO3Ap. CONCLUSIONS: Our results suggest that the formation of soft tissues, including connective tissue, was promoted by CO3Ap in the extraction socket within a short period.

    DOI: 10.1186/s40729-022-00408-4

  • Replacement Process of Carbonate Apatite by Alveolar Bone in a Rat Extraction Socket. International journal

    Xiaoxu Zhang, Ikiru Atsuta, Ikue Narimatsu, Nobuyuki Ueda, Ryosuke Takahashi, Yuki Egashira, Jing-Qi Zhang, Jiong-Yan Gu, Kiyoshi Koyano, Yasunori Ayukawa

    Materials (Basel, Switzerland)   14 ( 16 )   2021.8

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    The objective of this study was to investigate a bone graft substitute containing carbonate apatite (CO3Ap) to analyze bone replacement and the state of bone formation in vitro and in vivo compared with autogenous bone (AB) or control. An osteoclast precursor cell line was cultured with AB or CO3Ap, and morphological analysis using scanning electron microscopy and a tartrate-resistant acid phosphatase activity assay were performed. The right maxillary first and second molars of Wistar rats were extracted and compensated by AB or CO3Ap granules. Following implantation, the bone formation state was evaluated after 3, 5, 7, 14, and 28 days of surgery by micro-computed tomography and immunohistostaining. The osteoclast-like cell morphology was typical with many cell protrusions in the AB and CO3Ap groups. Additionally, the number of osteoclast-like cells formed in the culture increased in each group; however, there was no significant difference between the AB and CO3Ap groups. Five days after tooth extraction, osteoclasts were observed near CO3Ap. The bone thickness in the CO3Ap group was significantly increased than that in the control group and the bone formation in the CO3Ap group increased by the same level as that in the AB group. CO3Ap is gradually absorbed by osteoclasts in the extraction socket and is easily replaced by alveolar bone. The process of bone replacement by osteoclasts is similar to that of autologous bone. By observing the process of bone replacement in more detail, it may be possible to gain a better understanding of the bone formation and control the amount of bone after surgery.

    DOI: 10.3390/ma14164457

  • Assessment of the Soft-Tissue Seal at the Interface between the Base of the Fixed Denture Pontic and the Oral Mucosa. International journal

    Ikiru Atsuta, Ikue Narimatsu, Taichiro Morimoto, Chi-Hsiang Cheng, Kiyoshi Koyano, Yasunori Ayukawa

    Materials (Basel, Switzerland)   14 ( 14 )   2021.7

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    Fixed dentures (bridges) are often selected as a treatment option for a defective prosthesis. In this study, we assess the contact condition between the base of the pontic and oral mucosa, and examine the effect of prosthetic preparation and material biocompatibility. The molars were removed and replaced with experimental implants with a free-end type bridge superstructure after one week. In Experiment 1, we assessed different types of prosthetic pre-treatment: (1) the untreated control group (Con: mucosa recovering from the tooth extraction); (2) the laser irradiation group (Las: mucosa recovering after the damage caused by a CO2 laser); and (3) the tooth extraction group (Ext: mucosa recovering immediately after the teeth extraction). In Experiment 2, five materials (titanium, zirconia, porcelain, gold-platinum alloy, and self-curing resin) were placed at the base of the bridge pontic. Four weeks after the placement of the bridge, the mucosa adjacent to the pontic base was histologically analyzed. In Experiment 1, the Con and Las groups exhibited no formation of an epithelial sealing structure on the pontic base. In the Ext group, adherent epithelium was observed. In Experiment 2, the sealing properties at the pontic interface were superior for titanium and the zirconia compared with those made of porcelain or gold-platinum alloy. In the resin group, a clear delay in epithelial healing was observed.

    DOI: 10.3390/ma14143997

  • The need for polishing and occlusal adjustment of zirconia prostheses for wear on antagonist teeth.

    Keishu Tachibana, Ikiru Atsuta, Yoshihiro Tsukiyama, Rika Kuwatsuru, Takehiro Morita, Hiroya Yoshimatsu, Yasuyuki Matsushita, Ikue Narimatsu, Yasunori Ayukawa, Yoshinori Sawae, Kiyoshi Koyano

    Dental materials journal   40 ( 3 )   650 - 656   2021.5

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    The attrition of enamel when opposed by ceramics is of great concern. The purpose of this study was to evaluate enamel wear against high translucent zirconia (Zr), lithium disilicate (LD), gold (Au), and enamel (E) with different surface and contact conditions. The materials were divided into two groups: polished and ground (n=8 each). Two-body wear tests were performed against human enamel with vertical and horizontal, horizontal, and vertical repetitive movements as experiments 1 to 3 respectively. The surface roughness of all materials except Zr changed throughout the experiments. In experiment 1, Zr and Au showed less antagonist wear when polished than when ground. In experiment 2, polished groups showed less antagonist wear than ground groups in all materials. In experiment 3, Zr and LD exerted greater antagonist wear than E, regardless of Ra. These findings confirm the importance of polishing and occlusal adjustment of zirconia.

    DOI: 10.4012/dmj.2020-190

  • Soft Tissue Interface with Various Kinds of Implant Abutment Materials. International journal

    Akihiro Furuhashi, Yasunori Ayukawa, Ikiru Atsuta, Yunia Dwi Rakhmatia, Kiyoshi Koyano

    Journal of clinical medicine   10 ( 11 )   2021.5

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    Various materials, such as titanium, zirconia and platinum-gold (Pt-Au) alloy, have been utilized for dental implant trans-mucosal parts. However, biological understanding of soft tissue reaction toward these materials is limited. The aim of this study was to compare the response of cell lines and soft tissue to titanium, zirconia and Pt-Au substrata. The surface hydroxyl groups and protein adsorption capacities of the substrata were measured. Next, gingival epithelial-like cells (Sa3) and fibroblastic cells (NIH3T3) were cultured on the materials, and initial cell attachment was measured. Immuno-fluorescent staining of cell adhesion molecules and cytoskeletal proteins was also performed. In the rat model, experimental implants constructed from various materials were inserted into the maxillary tooth extraction socket and the soft tissue was examined histologically and immunohistochemically. No significant differences among the materials were observed regarding the amount of surface hydroxyl groups and protein adsorption capacity. Significantly fewer cells of Sa3 and NIH3T3 adhered to the Pt-Au alloy compared to the other materials. The expression of cell adhesion molecules and a well-developed cytoskeleton was observed, both Sa3 and NIH3T3 on each material. In an animal model, soft tissue with supracrestal tissue attachment was observed around each material. Laminin-5 immuno-reactivity was seen in epithelia on both titanium and zirconia, but only in the bottom of epithelia on Pt-Au alloy. In conclusion, both titanium and zirconia, but not Pt-Au alloy, displayed excellent cell adhesion properties.

    DOI: 10.3390/jcm10112386

  • Relationship between Maximum Tongue Pressure Value and Age, Occlusal Status, or Body Mass Index among the Community-Dwelling Elderly. International journal

    Hiroki Suzuki, Yasunori Ayukawa, Yoko Ueno, Ikiru Atsuta, Akio Jinnouchi, Kiyoshi Koyano

    Medicina (Kaunas, Lithuania)   56 ( 11 )   1 - 8   2020.11

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    Background and objectives: In an aging society, the maintenance of the oral function of the elderly is of importance for the delay or prevention of frailty and long-term care. In the present study, we focused on the maximum tongue pressure (MTP) value and analyzed the relationship between MTP and age, occlusal status, or body mass index (BMI). Materials and Methods: This one-center observatory study was conducted using a cohort consisting of 205 community-dwelling outpatients over 65 years old. The MTP values of all subjects were measured using a commercially available tongue pressure measurement device and statistically analyzed. In addition, the correlation between MTP value and BMI was analyzed. Results: The MTP value decreased with age, especially in subjects classified as Eichner B and C. The difference in occlusal status did not show any statistically significant influence on MTP value. The correlation between BMI and MTP value was indicated in the tested groups other than an age of 65-74 and Eichner A groups. Conclusions: Although MTP value decreased with age, the difference in occlusal status did not have an impact on MTP value. The correlation between BMI and MTP value was not shown in the youngest group or a group with sufficient occlusal units. The results presented in the present study may imply that, even if MTP is low, younger age and/or better occlusal status compensate for the inferior MTP value in the cohort studied.

    DOI: 10.3390/medicina56110623

  • Localization of Integrin Beta-4 Subunit at Soft Tissue-Titanium or Zirconia Interface. International journal

    Yasunori Ayukawa, Ikiru Atsuta, Yasuko Moriyama, Yohei Jinno, Kiyoshi Koyano

    Journal of clinical medicine   9 ( 10 )   1 - 7   2020.10

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    Currently, along with titanium (Ti), zirconia is widely used as an abutment material for dental implants because it makes it possible to avoid gingival discoloration; however, the epithelial sealing capability of zirconia remains unknown. The purpose of the present study is to elucidate the localization of integrin β4 subunit (Inβ4), one of the main proteins in the attachment structure between gingival junctional epithelial (JE) cells and substrata. Maxillary first molars were extracted from rats, and implants were placed with Ti or zirconia transgingival parts; then, the localization of Inβ4 was observed. Morphological and functional changes in rat oral epithelial cells (OECs) cultured on a culture dish (Dish) and Ti and zirconia plates were also evaluated with Inβ4 immunofluorescence histochemistry and Western blotting. After four weeks of implant placement, the morphology of the peri-implant epithelium (PIE) and the localization of Inβ4 around the Ti and zirconia transgingival parts were similar. However, both exhibited markedly shorter Inβ4-positive bands in the PIE than in the JE around natural teeth. Decreased expression levels of Inβ4 were observed in OECs cultured on Ti and zirconia plates compared with those cultured on Dish. In conclusion, although inferior to natural teeth, zirconia implants are thought to have epithelial sealing properties comparable to those of titanium.

    DOI: 10.3390/jcm9103331

  • The impact of surface alteration on epithelial tissue attachment after the mechanical cleaning of titanium or zirconia surface. International journal

    Jiangqi Hu, Ikiru Atsuta, Yasunori Ayukawa, Xudiyang Zhou, Yunia Dwi Rakhmatia, Kiyoshi Koyano

    Journal of oral rehabilitation   47 ( 9 )   1065 - 1076   2020.9

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    OBJECTIVE: Mechanical plaque removal may alter the surface morphology of the gingival penetration part of the implant. We applied an air-powered abrasive system (AP), titanium curette (TC), stainless curette (SC), ultrasound scaler (US), and titanium brush (TB) which are commonly used to remove plaque, to titanium or zirconia and the changes in surface morphology and the epithelial attach against substrata. MATERIALS AND METHODS: (a) The morphological changes of titanium and zirconia after mechanical cleaning were assessed by scanning electron microscopy and a roughness analyser. (b) Oral epithelial cells of rats were inoculated on the surface of the materials after mechanical cleaning, and the adherence of epithelial cells was observed. (c) The maxillary first molars were extracted from the rats and replaced by experimental titanium or zirconia implants. The length of the immunoreactive laminin-332 band was observed at the implant-peri-implant epithelium interface. RESULTS: (a) The surface roughness increased in experimental groups except the AP group. (b) Among the experimental groups, the AP group showed the highest number of attached cells. (c) The length of the immunoreactive laminin-332 band was longer in the control group than those in all five experimental groups. Among the experimental groups, the AP group showed the longest band. CONCLUSION: All mechanical cleaning methods increased the surface roughness of the materials except AP. AP did not cause distinct implant surface alterations. Surface alteration caused by mechanical cleaning may evoke inferior for epithelial attachment and reduce resistance against foreign infiltration.

    DOI: 10.1111/joor.12920

  • Effect of Calcium Chloride Hydrothermal Treatment of Titanium on Protein, Cellular, and Bacterial Adhesion Properties. International journal

    Takuya Haraguchi, Yasunori Ayukawa, Yukie Shibata, Toru Takeshita, Ikiru Atsuta, Yoichiro Ogino, Noriyuki Yasunami, Yoshihisa Yamashita, Kiyoshi Koyano

    Journal of clinical medicine   9 ( 8 )   1 - 12   2020.8

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    Topographical modification of the dental implant surface is one of the main topics for the improvement of the material, however, the roughened surface has some risks for peri-implantitis. A hydrothermal treatment (HT) of titanium with calcium chloride solution was reported to improve osseointegration and soft tissue sealing without changing the surface topography; however, its mechanism is unclear. We herewith investigated the interaction between extracellular matrix (ECM) protein and HT titanium. Furthermore, we also clarified the bacterial interaction. We employed two kinds of HT, HT with water (DW-HT) and HT with calcium chloride solution (Ca-HT). As a result, the adsorptions of both laminin-332 and osteopontin onto the Ca-HT surface were enhanced. In contrast, the adsorption of albumin, which was reported to have no cell adhesion capacity, was not influenced by Ca-HT. Osteoblast adhesion onto Ca-HT was also enhanced. Although Ca-HT was reported to enhance both epithelial cell attachment strength and in vivo peri-implant epithelial bonding, the number of epithelial cell attachment was not increased even after HT. Ca-HT had no impact in the adhesion of Streptococcus gordonii. These results suggest that Ca-HT enhances cell adhesion onto titanium without increasing bacterial adhesion, and the improvement of ECM protein adsorption is supposed to contribute to cell adhesion.

    DOI: 10.3390/jcm9082627

  • Effects of Different Divalent Cation Hydrothermal Treatments of Titanium Implant Surfaces for Epithelial Tissue Sealing. International journal

    Xudiyang Zhou, Ikiru Atsuta, Yasunori Ayukawa, Ikue Narimatsu, Tianren Zhou, Jiangqi Hu, Kiyoshi Koyano

    Materials (Basel, Switzerland)   13 ( 9 )   2020.4

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    The improvement of peri-implant epithelium (PIE) adhesion to titanium (Ti) may promote Ti dental implant stability. This study aims to investigate whether there is a positive effect of Ti hydrothermally treated (HT) with calcium chloride (CaCl2), zinc chloride (ZnCl2), and strontium chloride (SrCl2) on promoting PIE sealing. We analyzed the response of a rat oral epithelial cell (OEC) culture and performed an in vivo study in which the maxillary right first molars of rats were extracted and replaced with calcium (Ca)-HT, zinc (Zn)-HT, strontium (Sr)-HT, or non-treated control (Cont) implants. The OEC adhesion on Ca-HT and Zn-HT Ti plates had a higher expression of adhesion proteins than cells on the Cont and Sr-HT Ti plates. Additionally, the implant PIE of the Ca-HT and Zn-HT groups revealed better expression of immunoreactive laminin-332 (Ln-322) at 2 weeks after implantation. The Ca-HT and Zn-HT groups also showed better attachment at the implant-PIE interface, which inhibited horseradish peroxidase penetration. These results demonstrated that the divalent cations of Ca (Ca2+) and Zn (Zn2+)-HT improve the integration of epithelium around the implant, which may facilitate the creation of a soft barrier around the implant to protect it from foreign body penetration.

    DOI: 10.3390/ma13092038

  • Preventive effect of fluvastatin on the development of medication-related osteonecrosis of the jaw. International journal

    Naomi Adachi, Yasunori Ayukawa, Noriyuki Yasunami, Akihiro Furuhashi, Mikio Imai, Koma Sanda, Ikiru Atsuta, Kiyoshi Koyano

    Scientific reports   10 ( 1 )   5620 - 5620   2020.3

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    Medication-related osteonecrosis of the jaw (MRONJ) occurs in patients undergoing oral surgery while medicated with bisphosphonate, denosumab or anti-angiogenic agents. We employed a MRONJ-like rat model to investigate whether injecting fluvastatin at extraction sites prevents MRONJ-like lesion. A MRONJ-like model was created by treating rats with zoledronate and dexamethasone, extracting teeth, and immediately injecting fluvastatin at the extraction site. The experimental group comprised three subgroups treated with low (0.1 mg/kg; FS-L), medium (1.0 mg/kg; FS-M) and high concentrations (10 mg/kg; FS-H) of fluvastatin. Necrotic bone exposure was significantly lower in the FS-M (p = 0.028) and FS-H (p = 0.041) groups than in the MRONJ group. The distance between the edges of the epithelial surfaces was significantly shorter in the FS-M (p = 0.042) and FS-H (p = 0.041) groups. The area of necrotic bone and the necrotic bone ratio were significantly smaller in the FS-H group (p = 0.041 and p = 0.042 respectively). Bone volume fraction calculated on μ-CT images was significantly larger in the FS-H group than in the MRONJ group (p = 0.021). Our findings suggest that a single local injection of fluvastatin following tooth extraction can potentially reduce the chance of developing MRONJ-like lesion in rats.

    DOI: 10.1038/s41598-020-61724-6

  • Novel application method for mesenchymal stem cell therapy utilizing its attractant-responsive accumulation property

    Nobuyuki Ueda, Ikiru Atsuta, Yasunori Ayukawa, Takayoshi Yamaza, Akihiro Furuhashi, Ikue Narimatsu, Yuri Matsuura, Ryosuke Kondo, Yu Watanabe, Xiaoxu Zhang, Kiyoshi Koyano

    Applied Sciences (Switzerland)   9 ( 22 )   2019.11

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    Stem cell therapy is an emerging treatment modality for various diseases. Because mesenchymal stem cells (MSCs) are known to accumulate at the site of damage, their possible clinical application has been investigated. MSCs are usually administered using intravenous injection, but this route carries a risk of pulmonary embolism. In contrast, topical injection of MSCs reportedly has an inferior therapeutic effect. We developed a remote administration method that uses collagen gel as a scaffold and investigated the effect of this scaffold on the retention of stemness, homing ability, and therapeutic effect using a mouse tooth extraction model. After verifying the retention of stemness of MSCs isolated from the bone marrow of donor mice in the scaffold, we administered MSCs subcutaneously into the back of the recipient mice with scaffold and observed the accumulation and the acceleration of healing of the extraction socket of the maxillary first molar. The MSCs cultured with scaffold retained stemness, the MSCs injected into back skin with scaffold successfully accumulated around the extraction socket, and socket healing was significantly enhanced. In conclusion, administration of MSCs with collagen scaffold at a remote site enhanced the lesion healing without the drawbacks of currently used administration methods.

    DOI: 10.3390/app9224908

  • Epithelial and Connective Tissue Sealing around Titanium Implants with Various Typical Surface Finishes. International journal

    Ikue Narimatsu, Ikiru Atsuta, Yasunori Ayukawa, Wakana Oshiro, Noriyuki Yasunami, Akihiro Furuhashi, Kiyoshi Koyano

    ACS biomaterials science & engineering   5 ( 10 )   4976 - 4984   2019.10

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    Soft tissue barrier around a dental implant plays a crucial role in the success of dental implants because it protects underlying hard tissue structures. A number of surface alteration procedures of implants have been introduced to improve bone-implant contact, but there has been little research on the peri-implant soft tissue (PIS) seal. The present study focuses on the "biologic width" of epithelial and connective tissue seals around implants with various typical surface finishes by testing surfaces that have been machined (Ms), roughened by sandblasting and acid etching (Rs), treated hydrothermally with CaCl2 (Cs), or anodized (As). Ms, Rs, and As techniques are commonly used to finish surfaces of commercially available dental implants. The Cs technique was reported to produce strong epithelial cell-titanium adhesion. For culture study, rat oral epithelial cells (OECs) and fibroblasts were cultured on Ms, Rs, Cs, and As titanium plates. There was less cell adherence of OECs and more collagen expression when cultured on Rs and As plates than when cultured on Ms and Cs plates. For the in vivo study, implants with Ms, Rs, Cs, and As surfaces were placed in the rats' oral cavity. Although the PIS structure was similar to that around natural teeth, a horseradish peroxide assay revealed that the sealing ability around the Ms and Rs implants was weaker than that around Cs implants. After 16 weeks, Rs implants exhibited peri-implant epithelial apical down-growth and had lost bone support. Thus, although a smooth surface (Ms and Cs) showed better epithelial attachment, rough surfaces (Rs and As) are more suitable for binding to the connective tissue. Strong epithelium-implant attachment seems to be a fundamental defense against foreign body penetration. Selecting suitable surfaces to ensure strong sealing is important for implant success.

    DOI: 10.1021/acsbiomaterials.9b00499

  • Long Term Retention of Gingival Sealing around Titanium Implants with CaCl2 Hydrothermal Treatment: A Rodent Study. International journal

    Yasunori Ayukawa, Wakana Oshiro, Ikiru Atsuta, Akihiro Furuhashi, Ryosuke Kondo, Yohei Jinno, Kiyoshi Koyano

    Journal of clinical medicine   8 ( 10 )   2019.9

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    We previously reported that CaCl2 hydrothermal-treated (Ca-HT) titanium (Ti) implants induced a tight sealing at the interface between the implant and peri-implant epithelium (PIE) after implantation. However, it is not clear how long this improved epithelium sealing can be maintained. We subsequently investigated whether the positive effect of Ca-HT to promote sealing between the PIE and implant was sustained longer term. Maxillary molars were extracted from rats and replaced with either Ca-HT implants (Ca-HT group), distilled water-HT implants (DW-HT group) or non-treated implants (control group). After 16 weeks, the majority of implants in the Ca-HT group remained at the maxillary with no apical extension of the PIE. Conversely, half the number of control implants was lost following down-growth of the PIE. The effect of Ca-HT on migration and proliferation of rat oral epithelial cells (OECs) was also investigated. In OECs cultured on Ca-HT Ti plates, protein expression in relation to cell migration decreased, and proliferation was higher than other groups. Surface analysis indicated HT enhanced the formation of surface TiO2 layer without altering surface topography. Consequently, Ca-HT of Ti reduced PIE down-growth via tight epithelial attachment to the surface, which may enhance implant capability for a longer time post-implantation.

    DOI: 10.3390/jcm8101560

  • Effect of Hydrothermal Treatment with Distilled Water on Titanium Alloy for Epithelial Cellular Attachment. International journal

    Yasushige Sakamoto, Yasunori Ayukawa, Akihiro Furuhashi, Michimasa Kamo, Junji Ikeda, Ikiru Atsuta, Takuya Haraguchi, Kiyoshi Koyano

    Materials (Basel, Switzerland)   12 ( 17 )   2019.8

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    The enhancement of oral epithelial adhesion to the trans-mucosal material of dental implants may improve their long-term stability. The aim of this study is to investigate whether hydrothermal treatment with distilled water (HT-DW) applied to a Ti-6Al-4V (Ti64) alloy could improve epithelial cellular attachment. We hypothesized that this treatment would enhance the adsorption of proteins and the adhesion of gingival epithelial GE1 cells. This treatment changed the surface crystal structure into an anatase type of titanium oxide without an apparent change of surface roughness or topography. Nitrogen was not detected on the HT-DW-treated Ti64, which indicates decontamination. HT-DW-treated Ti64 exhibited a hydrophilic surface with a less than 10° angle of water contact. Adsorption of laminin-332 to the HT-DW-treated Ti64 was significantly greater than that of the untreated Ti64 plates (64). The number of GE1 cells on the HT-DW-treated Ti64 at 1 and 3 days was significantly lower than that on 64; however, cell adhesion strength on HT-DW was greater, with a higher expression of integrin β4, compared with 64. This indicates that the HT-DW treatment of Ti64 improves the integration of GE1 cells, which might facilitate the development of a soft tissue barrier around the implant.

    DOI: 10.3390/ma12172748

  • Epithelial sealing effectiveness against titanium or zirconia implants surface. International journal

    Ikiru Atsuta, Yasunori Ayukawa, Akihiro Furuhashi, Ikue Narimatsu, Ryosuke Kondo, Wakana Oshiro, Kiyoshi Koyano

    Journal of biomedical materials research. Part A   107 ( 7 )   1379 - 1385   2019.7

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    The aims of implant treatment now involve not only restoration of mastication function, but also recovery of esthetics. Currently, zirconia is widely used as an esthetic material for implant abutment. Therefore, it is very important to understand the efficacy of zirconia for epithelial sealing as an implant material. We compared the effects of materials on the sealing of the peri-implant epithelium (PIE) to titanium (Ti) or zirconia (Zr) implants, for application to clinical work. Maxillary first molars were extracted from rats and replaced with Ti or Zr implants. The sealing of the PIE to the implants was evaluated with immunohistochemistry observation and HRP analysis. The morphological and functional changes in rat oral epithelial cells (OECs) cultured on Ti or Zr plates were also evaluated. After 4 weeks, the PIE on the Ti and Zr implants showed similar structures. The Zr implants appeared to form a weak epithelial seal at the tissue-implant interface, and exhibited markedly less adhesive structures than the Ti implants under electron microscopic observation. In the in vitro experiments, decreased expression levels of adhesion proteins were observed in OECs cultured on Zr plates compared with those cultured on Ti plates. In addition, the cell adherence on Zr plates was reduced, while the cell migration was low on Ti plates. Zr is a better choice for an esthetic implant material, but needs further improvement for integration with the epithelial wound healing process around a dental implant. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2019.

    DOI: 10.1002/jbm.a.36651

  • Effect of a Single Injection of Benidipine-Impregnated Biodegradable Microcarriers on Bone and Gingival Healing at the Tooth Extraction Socket. International journal

    Mikio Imai, Yasunori Ayukawa, Noriyuki Yasunami, Akihiro Furuhashi, Yoko Takemura, Naomi Adachi, Jiangqi Hu, Xudiyang Zhou, Yasuko Moriyama, Ikiru Atsuta, Kosaku Kurata, Kiyoshi Koyano

    Advances in wound care   8 ( 3 )   108 - 117   2019.3

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    Objective: A dihydropyridine-type calcium channel blocker, benidipine (BD), is extensively used in hypertension therapy. In vitro study reported BD promoting bone metabolism. We evaluated the effect of sustained release of BD-loaded poly(lactic-co-glycolic acid) (PLGA) microcarriers on the promotion of bone and gingival healing at an extraction socket in vivo. In addition, the effect of BD on osteoblasts, osteocytes, fibroblasts, and epithelial cells was evaluated in vitro. Approach: The maxillary first molar of rats was extracted. Next, PLGA microcarriers containing BD were directly injected into the gingivobuccal fold as a single dose. After injection, bone and soft-tissue healing was histologically evaluated. Effect of BD on proliferation, migration, and gene expression of gingival and bone cell was also examined in vitro. Results: After tooth extraction, BD significantly augmented bone volume and density, and also epithelial wound healing. During in vitro studies, BD promoted significant proliferation and migration of fibroblasts and epithelial cells. Real-time RT-PCR revealed that BD upregulated messenger RNA expression of Ahsg (alpha 2-HS glycoprotein) and Csf2 (colony-stimulating factor 2) in osteoblasts. Innovation: The prevention of bone and soft-tissue reduction associated with tooth extraction has been eagerly anticipated in the field of dentistry. This study first reported the effect of BD on extraction socket healing. Conclusion: A single dose of topically administered BD-loaded PLGA microcarriers promoted bone and soft-tissue healing at the extraction site of tooth.

    DOI: 10.1089/wound.2018.0834

  • Exogenous nitric oxide stimulates the odontogenic differentiation of rat dental pulp stem cells. Invited Reviewed International journal

    Sonoda S, Mei YF, Atsuta I, Danjo A, Yamaza H, Hama S, Nishida K, Tang R, Kyumoto-Nakamura Y, Uehara N, Kukita T, Nishimura F, Yamaza T.

    2018.6

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  • The effective design of zirconia coping on titanium base in dental implant superstructure.

    Maiko Mieda, Ikiru Atsuta, Yasuyuki Matsushita, Takehiro Morita, Yasunori Ayukawa, Yoshihiro Tsukiyama, Yoshinori Sawae, Kiyoshi Koyano

    Dental materials journal   37 ( 2 )   237 - 243   2018.3

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    Zirconia exhibits good tissue compatibility and nontoxicity, making it a widely used esthetic replacement material for implant abutments. To avoid abutment-fracture, the parts composed of zirconia with a bonded metal component connected to the implant can be used. The purpose of this study was to design titanium and zirconia components with high fracture resistance at the zirconia component's edge line. Three edge line designs of the titanium base and zirconia sleeve were made: chamfer, shoulder, and back-taper. To assess the strength of the abutment design, static loads were applied vertically and 30 degrees from the vertical axis. A test of tensile strength was also performed after chewing simulation. Conventional zirconia components mounted on a chamfer-type titanium base showed significantly lower fracture resistance than shoulder and back-taper types. This study suggests that to improve the durability of zirconia abutments with a titanium base, a back-tapered edge design is recommended.

    DOI: 10.4012/dmj.2017-022

  • Exogenous nitric oxide stimulates the odontogenic differentiation of rat dental pulp stem cells. Reviewed International journal

    Sonoda S, Mei YF, Atsuta I, Danjo A, Yamaza H, Hama S, Nishida K, Tang R, Kyumoto-Nakamura Y, Uehara N, Kukita T, Nishimura F, Yamaza T

    Scientific reports   8 ( 1 )   3419 - 3419   2018.2

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    Exogenous nitric oxide stimulates the odontogenic differentiation of rat dental pulp stem cells.
    Nitric oxide (NO) is thought to play a pivotal regulatory role in dental pulp tissues under both physiological and pathological conditions. However, little is known about the NO functions in dental pulp stem cells (DPSCs). We examined the direct actions of a spontaneous NO gas-releasing donor, NOC-18, on the odontogenic capacity of rat DPSCs (rDPSCs). In the presence of NOC-18, rDPSCs were transformed into odontoblast-like cells with long cytoplasmic processes and a polarized nucleus. NOC-18 treatment increased alkaline phosphatase activity and enhanced dentin-like mineralized tissue formation and the expression levels of several odontoblast-specific genes, such as runt related factor 2, dentin matrix protein 1 and dentin sialophosphoprotein, in rDPSCs. In contrast, carboxy-PTIO, a NO scavenger, completely suppressed the odontogenic capacity of rDPSCs. This NO-promoted odontogenic differentiation was activated by tumor necrosis factor-NF-κB axis in rDPSCs. Further in vivo study demonstrated that NOC-18-application in a tooth cavity accelerated tertiary dentin formation, which was associated with early nitrotyrosine expression in the dental pulp tissues beneath the cavity. Taken together, the present findings indicate that exogenous NO directly induces the odontogenic capacity of rDPSCs, suggesting that NO donors might offer a novel host DPSC-targeting alternative to current pulp capping agents in endodontics.

    DOI: 10.1038/s41598-018-21183-6

  • The influence of systemically or locally administered mesenchymal stem cells on tissue repair in a rat oral implantation model. Invited Reviewed International journal

    Kanazawa M, Atsuta I, Ayukawa Y, Yamaza T, Kondo R, Matsuura Y, Koyano K.

    2018.2

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  • The influence of systemically or locally administered mesenchymal stem cells on tissue repair in a rat oral implantation model. International journal

    Miya Kanazawa, Ikiru Atsuta, Yasunori Ayukawa, Takayoshi Yamaza, Ryosuke Kondo, Yuri Matsuura, Kiyoshi Koyano

    International journal of implant dentistry   4 ( 1 )   2 - 2   2018.1

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    BACKGROUND: Multipotent mesenchymal stem cells (MSCs) are used clinically in regenerative medicine. Our previous report showed systemically injected MSCs improved peri-implant sealing and accelerated tissue healing. However, the risks of systemic MSC administration, including lung embolism, must be considered; therefore, their local application must be assessed for clinical safety and efficacy. We investigated differences in treatment effect between local and systemic MSC application using a rat oral implantation model. METHODS: Rat bone marrow-derived MSCs were isolated and culture-expanded. The rat's right maxillary first molars were extracted and replaced with experimental titanium implants. After 24 h, MSCs (1 × 106/ml) were systemically or locally injected into recipient rats via the tail vein (systemic group) or buccal subcutaneous tissue (local group), respectively. Rats treated in the absence of MSCs were included as a control (control group). The maxillary epithelium was assessed histologically after 4 weeks to evaluate laminin-332 (Ln-332) distribution and horseradish peroxidase invasion, as indicators of peri-implant epithelium (PIE) formation and PIE sealing to the implant surface, respectively. The effect of MSCs on rat oral epithelial cell (OEC) morphology was determined by coculture. RESULTS: Systemic group MSCs accumulated early at the peri-implant mucosa, while local group MSCs were observed in various organs prior to later accumulation around the implant surface. PIE formation and Ln-332-positive staining at the implant interface were enhanced in the systemic group compared with the local and control groups. Furthermore, OEC adherence on implants was reduced in high-density compared with low-density MSC cocultures. CONCLUSIONS: Local MSC injection was more ineffective than systemic MSC injection at enhancing PIE sealing around titanium implants. Thus, although local MSC administration has a wide range of applications, further investigations are needed to understand the exact cellular and molecular mechanisms of this approach prior to clinical use.

    DOI: 10.1186/s40729-017-0112-4

  • Histopathological comparison of the onset of peri-implantitis and periodontitis in rats. International journal

    Yuzo Takamori, Ikiru Atsuta, Hirotaka Nakamura, Takashi Sawase, Kiyoshi Koyano, Yoshitaka Hara

    Clinical oral implants research   28 ( 2 )   163 - 170   2017.2

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    BACKGROUND AND OBJECTIVE: There are a few experimental models that clearly describe the pathological differences in tissue destruction between periodontitis and peri-implantitis. We recently reported that the formation of immune complexes accelerates site-specific loss of attachment and alveolar bone resorption when an antigen is topically applied in the gingival sulcus of an immunized rat. We applied this model to the peri-implant tissues and compared peri-implant destruction to periodontitis without using a ligature. MATERIAL AND METHODS: Twenty-five rats were used in this study and were divided into five groups. Implantation was performed immediately after extraction of right first molars in rats. The left first molars were left untreated to be examined as natural teeth. The immunized group consisted of rats that had received intraperitoneal lipopolysaccharide (LPS), whereas the nonimmunized group received only phosphate-buffered saline (PBS). The untreated baseline group received only implantation. After intraperitoneal booster injection, half of each group received topical application of LPS in the palatal gingival sulcus daily for 3 days. The other half of the groups received PBS. Histopathological and histometrical findings were observed with hematoxylin and eosin staining, collagen fibers were observed with Azan staining, and formation of immune complexes was immunohistologically evaluated by C1qB expression. RESULT: Peri-implant tissue destruction was greater in the immunized and LPS-applied groups than in the other groups. No periodontal destruction was observed. Formation of immune complexes was observed in the junctional epithelium and adjacent connective tissue in the immunized groups. CONCLUSION: Antigen-induced peri-implant tissue destruction occurs faster than periodontal tissue destruction.

    DOI: 10.1111/clr.12777

  • Tissue Reaction to a Novel Bone Substitute Material Fabricated With Biodegradable Polymer-Calcium Phosphate Nanoparticle Composite. International journal

    Hideo Shimizu, Yohei Jinno, Yasunori Ayukawa, Ikiru Atsuta, Takaaki Arahira, Mitsugu Todo, Kiyoshi Koyano

    Implant dentistry   25 ( 5 )   567 - 74   2016.10

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    PURPOSE: The aim of this study was to evaluate the effectiveness of a novel bone substitute material fabricated using a biodegradable polymer-calcium phosphate nanoparticle composite. METHODS: Porous structured poly-L-lactic acid (PLLA) and hydroxyapatite (HA) nanoparticle composite, which was fabricated using solid-liquid phase separation and freeze-drying methods, was grafted into bone defects created in rat calvarium or tibia. Rats were killed 4 weeks after surgery, and histological analyses were performed to evaluate new bone formation. RESULTS: Scanning electron microscopic observation showed the interconnecting pores within the material and the pore diameter was approximately 100 to 300 μm. HA nanoparticles were observed to be embedded into the PLLA beams. In the calvarial implantation model, abundant blood vessels and fibroblastic cells were observed penetrating into pores, and in the tibia model, newly formed bone was present around and within the composite. CONCLUSIONS: The PLLA-HA nanoparticle composite bone substitute developed in this study showed biocompatibility, elasticity, and operability and thus has potential as a novel bone substitute.

    DOI: 10.1097/ID.0000000000000447

  • Medication-related osteonecrosis of the jaw; what should we do as prosthodontists?

    Shinichiro Kuroshima, Masaru Kaku, Takashi Matsuura, Ikiru Atsuta, Yasunori Ayukawa, Takashi Sawase

    Journal of prosthodontic research   60 ( 4 )   229 - 230   2016.10

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    DOI: 10.1016/j.jpor.2016.01.004

  • Therapeutic interactions between mesenchymal stem cells for healing medication-related osteonecrosis of the jaw. International journal

    Yuri Matsuura, Ikiru Atsuta, Yasunori Ayukawa, Takayoshi Yamaza, Ryosuke Kondo, Akira Takahashi, Nobuyuki Ueda, Wakana Oshiro, Yoshihiro Tsukiyama, Kiyoshi Koyano

    Stem cell research & therapy   7 ( 1 )   119 - 119   2016.8

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    BACKGROUND: Mesenchymal stem cells (MSCs) have been isolated from a variety of tissues, including bone marrow, adipose, and mucosa. MSCs have the capacity for self-renewal and differentiation. Reports have been published on the systemic administration of MSCs leading to functional improvements by engraftment and differentiation, thus providing a new strategy to regenerate damaged tissues. Recently, it has become clear that MSCs possess immunomodulatory properties and can therefore be used to treat diseases. However, the therapeutic effect mechanisms of MSCs are yet to be determined. Here, we investigated these mechanisms using a medication-related osteonecrosis of the jaw (MRONJ)-like mouse model. METHODS: To generate MRONJ-like characteristics, mice received intravenous zoledronate and dexamethasone two times a week. At 1 week after intravenous injection, maxillary first molars were extracted, and at 1 week after tooth extraction, MSCs were isolated from the bone marrow of the mice femurs and tibias. To compare "diseased MSCs" from MRONJ-like mice (d-MSCs) with "control MSCs" from untreated mice (c-MSCs), the isolated MSCs were analyzed by differentiation and colony-forming unit-fibroblast (CFU-F) assays and systemic transplantation of either d-MSCs or c-MSCs into MRONJ-like mice. Furthermore, we observed the exchange of cell contents among d-MSCs and c-MSCs during coculture with all combinations of each MSC type. RESULTS: d-MSCs were inferior to c-MSCs in differentiation and CFU-F assays. Moreover, the d-MSC-treated group did not show earlier healing in MRONJ-like mice. In cocultures with any combination, MSC pairs formed cell-cell contacts and exchanged cell contents. Interestingly, the exchange among c-MSCs and d-MSCs was more frequently observed than other pairs, and d-MSCs were distinguishable from c-MSCs. CONCLUSIONS: The interaction of c-MSCs and d-MSCs, including exchange of cell contents, contributes to the treatment potential of d-MSCs. This cellular behavior might be one therapeutic mechanism used by MSCs for MRONJ.

    DOI: 10.1186/s13287-016-0367-3

  • Soft tissue sealing around dental implants based on histological interpretation.

    Ikiru Atsuta, Yasunori Ayukawa, Ryosuke Kondo, Wakana Oshiro, Yuri Matsuura, Akihiro Furuhashi, Yoshihiro Tsukiyama, Kiyoshi Koyano

    Journal of prosthodontic research   60 ( 1 )   3 - 11   2016.1

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    PURPOSE: The aim of this study was to provide an overview on the biology and soft tissue sealing around dental implants and teeth. STUDY SELECTION: This is a narrative review performed through scientific articles published between 1977 and 2014, indexed in MEDLINE and PubMed databases. The study selected articles that focused on epithelial sealing around dental implant or teeth with cell biology and histology of soft tissue. RESULTS: Implant therapy has been widely applied in dental rehabilitation for many years, with predictable long-term results. The longevity and functionality of dental implants is dependent on both osseointegration around the implant body and the establishment of a soft tissue barrier that protects the underlying hard tissue structures and the implant itself. The health and stability of the peri-implant mucosa also affects the esthetics of the implant. The healing and maintenance of the epithelial and connective tissues around implants are increasingly recognized as being fundamental to implant success. However, there has been little research into the function or formation of the soft tissue seal around dental implants, and the roles of this unique mucosal interface remain unclear. CONCLUSIONS: This narrative review explores the extent of the current knowledge of soft tissue barriers around implants from both a basic and clinical perspective, and aims to consolidate this knowledge and highlight the most pertinent questions relating to this area of research.

    DOI: 10.1016/j.jpor.2015.07.001

  • Additional Effects of Platelet-Rich Fibrin on Bone Regeneration in Sinus Augmentation With Deproteinized Bovine Bone Mineral: Preliminary Results. International journal

    Hideaki Tanaka, Takeshi Toyoshima, Ikiru Atsuta, Yasunori Ayukawa, Masanori Sasaki, Yasuyuki Matsushita, Ryu Hiraoka, Kiyoshi Koyano, Seiji Nakamura

    Implant dentistry   24 ( 6 )   669 - 74   2015.12

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    PURPOSE: Platelet-rich fibrin (PRF) has been reported to contribute to bone regeneration; however, little is known about details with deproteinized bovine bone mineral (DBBM). This study aims to evaluate additional effects of PRF on bone regeneration in sinus augmentation with DBBM. MATERIALS AND METHODS: Sinus augmentations were made with DBBM/PRF mixture as lateral approach for 4 sinuses from 4 patients. Bone biopsies were obtained from posterior maxilla at the implant placements 7 or 10 months after sinus augmentations. Histological observations and histomorphometric analyses from augmented areas were performed. RESULTS: The new bone formation was found around the DBBMs with very good contact while surfaces of DBBMs were partly resorbed. Osteoclasts recognized the DBBMs for remodeling, followed by new bone running. The histomorphometric analyses revealed that mean percentages of newly formed bone were 31.7 ± 1.2&#37;, 21.0 ± 1.0&#37;, 38.0 ± 0.6&#37;, and 47.0 ± 0.6&#37;, respectively (mean 34.5 ± 5.7&#37;). CONCLUSIONS: Additional effects of PRF could be found because of higher percentages of newly bone formation by DBBM/PRF mixture than those by DBBM individual in previous reports.

    DOI: 10.1097/ID.0000000000000306

  • Acceleration of hard and soft tissue healing in the oral cavity by a single transmucosal injection of fluvastatin-impregnated poly (lactic-co-glycolic acid) microspheres. An in vitro and rodent in vivo study. International journal

    Noriyuki Yasunami, Yasunori Ayukawa, Akihiro Furuhashi, Ikiru Atsuta, Yunia Dwi Rakhmatia, Yasuko Moriyama, Tomohiro Masuzaki, Kiyoshi Koyano

    Biomedical materials (Bristol, England)   11 ( 1 )   015001 - 015001   2015.12

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    Antihyperlipidemic drug statins reportedly promote both bone formation and soft tissue healing. We examined the effect of sustained-release, fluvastatin-impregnated poly(lactic-co-glycolic acid) (PLGA) microspheres on the promotion of bone and gingival healing at an extraction socket in vivo, and the effect of fluvastatin on epithelial cells and fibroblasts in vitro. The maxillary right first molar was extracted in rats, then one of the following was immediately injected, as a single dose, into the gingivobuccal fold: control (no administration), PLGA microspheres without a statin (active control), or PLGA microspheres containing 20 or 40 μg kg(-1) of fluvastatin. At days 1, 3, 7, 14, and 28 after injection, bone and soft tissue healing were histologically evaluated. Cell proliferation was measured under the effect of fluvastatin at dosages of 0, 0.01, 0.1, 1.0, 10, and 50 μM. Cell migration and morphology were observed at dosages of 0 and 0.1 μM. Following tooth extraction, the statin significantly enhanced bone volume and density, connective tissue volume, and epithelial wound healing. In the in vitro study, it promoted significant proliferation and migration of epithelial cells and fibroblasts. A single dose of topically administered fluvastatin-impregnated PLGA microspheres promoted bone and soft tissue healing at the extraction site.

    DOI: 10.1088/1748-6041/11/1/015001

  • Effects of CaCl2 hydrothermal treatment of titanium implant surfaces on early epithelial sealing. International journal

    Wakana Oshiro, Yasunori Ayukawa, Ikiru Atsuta, Akihiro Furuhashi, Jyunichi Yamazoe, Ryosuke Kondo, Mami Sakaguchi, Yuri Matsuura, Yoshihiro Tsukiyama, Kiyoshi Koyano

    Colloids and surfaces. B, Biointerfaces   131   141 - 7   2015.7

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    Improvement of oral epithelial adhesion to titanium (Ti) may significantly enhance the efficacy of dental implants. We aimed to investigate whether calcium chloride (CaCl2) hydrothermally treated (HT) Ti could promote sealing of the peri-implant epithelium (PIE) around the implant. Right maxillary first molars were extracted from rats and replaced with either CaCl2-HT implants (Ca-HT group), distilled water-HT implants (DW-HT group), or untreated implants (Cont group). After 4 weeks, the implant-PIE interface of the Ca-HT group exhibited a band of immunoreactive laminin-332, similar to the tooth-junctional epithelium interface, which was absent in the Cont and DW-HT groups at the upper portion. We also investigated the effect of Ca-HT on the attachment of rat oral epithelial cells (OECs). OEC adherence onto Ca-HT Ti plates was stronger with higher expression levels of adhesion proteins compared with Cont and DW-HT groups. These results indicate that HT with CaCl2 improves the integration of soft tissue cells with the Ti implant at 4 weeks after implantation, which might facilitate the development of a soft tissue barrier around the implant.

    DOI: 10.1016/j.colsurfb.2015.04.025

  • Fibroblast attachment onto novel titanium mesh membranes for guided bone regeneration.

    Yunia Dwi Rakhmatia, Yasunori Ayukawa, Ikiru Atsuta, Akihiro Furuhashi, Kiyoshi Koyano

    Odontology   103 ( 2 )   218 - 26   2015.5

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    Titanium mesh is used in orthopedic surgery as a barrier membrane, as it offers suitable characteristics, which allow mechanical support during the formation of new bone. An ideal membrane would facilitate cell attachment onto its surface, thereby helping to stabilize the blood clot and integrate the membrane into the tissue. However, currently available titanium mesh has millimeter-level pore sizes, which lead to soft tissue ingrowth through the pores. Therefore, the aim of this study was to investigate the fibroblast attachment and migration on different designs of novel titanium mesh with micrometer pore size for guided bone regeneration treatment. Six types of novel titanium mesh membrane and three groups of commercially available membranes were used in this study. Fibroblasts were isolated from 4-day-old green fluorescence protein rats and seeded onto membrane surfaces. At 24 h, the cells attached to the membrane surfaces were fixed and stained with DAPI. The blue-stained nuclei on membrane surfaces, and both upper and lower sides were counted. It was shown that different membrane materials, structure and design differ considerably in their capacity for cell attachment to the membrane surface. The novel membranes, especially mesh with 12 pores compared with mesh with multi-pores, allowed the fibroblast attachment on the membrane surface, but hindered the fibroblast migration through the pores into the lower side of the membrane, which is associated with the defect area in the clinical condition.

    DOI: 10.1007/s10266-014-0151-8

  • In vivo and in vitro studies of epithelial cell behavior around titanium implants with machined and rough surfaces. International journal

    Ikiru Atsuta, Yasunori Ayukawa, Akihiro Furuhashi, Yoichiro Ogino, Yasuko Moriyama, Yoshihiro Tsukiyama, Kiyoshi Koyano

    Clinical implant dentistry and related research   16 ( 5 )   772 - 81   2014.10

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    BACKGROUND: The surface roughness of a dental implant affects the epithelial wound healing process and may significantly enhance implant prognosis. PURPOSE: We explored the influence of surface roughness on peri-implant epithelium (PIE) sealing and down-growth by comparing machine-surfaced (Ms) and rough-surfaced (Rs) implants. MATERIALS AND METHODS: (1) Maxillary first molars were extracted from rats and replaced with Ms or Rs implants. (2) We also compared changes in the morphology of cultured rat oral epithelial cells (OECs) grown on Ms or Rs titanium (Ti) plates. RESULTS: (1) After 4 weeks, the PIE around Ms and Rs implants showed a similar structure to junctional epithelium (JE). At 16 weeks, Rs implants appeared to form a weak epithelial seal at the tissue-implant interface and exhibited markedly less PIE down-growth than Ms implants but was deeper than that observed in natural teeth. (2) We observed less expression of adhesion proteins in OECs cultured on Rs plates than in cells grown on Ms plates. Additionally, cell adherence, migration, and proliferation on Rs plates were lower, whereas apoptosis was reduced on Ms plates. CONCLUSION: Ms implants are a better choice for integration with an epithelial wound healing process.

    DOI: 10.1111/cid.12043

  • The role of phosphoinositide 3-kinase in adhesion of oral epithelial cells to titanium. International journal

    Ikiru Atsuta, Yasunori Ayukawa, Takayoshi Yamaza, Akihiro Furuhashi, Kiyoshi Koyano

    Archives of oral biology   58 ( 11 )   1696 - 708   2013.11

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    BACKGROUND: Oral epithelial cells (OECs) adhesion to titanium may improve the success rate of implant restoration. PURPOSE: We investigated the mechanism by which OECs adhere to titanium dental implants. MATERIALS AND METHODS: (1) After culturing rat OECs on titanium plates (Ti) or culture dishes in the presence or absence of a phosphoinositide 3-kinase (PI3K) activator or inhibitors and/or growth factors, and OEC morphology under these conditions were analyzed. (2) Right maxillary first molars were extracted and replaced with experimental implants. The rats were treated with or without growth factors. RESULTS: (1) Cell adherence was lower of OECs on Ti than in those on culture dishes, as were the levels of integrin β4 and the continuity of F-actin structures. After PI3K inhibition, markedly reducing adherence to both substrates. In contrast, PI3K activation with activator or insulin-like growth factor restored the OEC adherence and the expression of adhesion molecules on Ti to the levels seen in OECs cultured on dishes. Cell migration was inhibited by PI3K activation. (2) High expression of integrin β4 was observed in the peri-implant epithelia of PI3K-activated rats. CONCLUSION: These findings suggest that PI3K plays an important role in the adhesion of OECs to Ti.

    DOI: 10.1016/j.archoralbio.2013.07.013

  • Promotive effect of insulin-like growth factor-1 for epithelial sealing to titanium implants. International journal

    Ikiru Atsuta, Yasunori Ayukawa, Akihiro Furuhashi, Takayoshi Yamaza, Yoshihiro Tsukiyama, Kiyoshi Koyano

    Journal of biomedical materials research. Part A   101 ( 10 )   2896 - 904   2013.10

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    Improvement of oral epithelial adhesion to titanium (Ti) may significantly enhance the efficacy of dental implants. Here, we investigated whether insulin-like growth factor-1 (IGF-1) improved the sealing of the peri-implant epithelium (PIE) around the implant. Right maxillary first molars were extracted from rats and replaced with experimental implants. After 4 weeks of IGF-1 treatment, the implant-PIE interface exhibited a band of immunoreactive laminin-332 (Ln-5), similar to the tooth-junctional epithelium interface, that was partially absent in the untreated group. Immunoelectron microscopy showed a characteristic Ln-5-positive band including hemidesmosomes at both the apical and upper portions of the implant-PIE interface in the IGF-1-treated group. We also investigated the effects of IGF-1/PI3K inhibitors on the dynamics of rat oral epithelial cells (OECs) grown on Ti plates. In OECs cultured with IGF-1, adhesion protein expression increased, cell adherence to Ti plates was higher, and proliferation was faster, whereas migration and apoptosis were induced in the absence of IGF-1 or in the presence of both IGF-1 and a PI3K inhibitor. These data suggest that PI3K mediates the promotive effects of IGF-1, and that IGF-1 is effective at enhancing epithelial integration around Ti implants.

    DOI: 10.1002/jbm.a.34608

  • IL-17-mediated M1/M2 macrophage alteration contributes to pathogenesis of bisphosphonate-related osteonecrosis of the jaws. International journal

    Qunzhou Zhang, Ikiru Atsuta, Shiyu Liu, Chider Chen, Shihong Shi, Songtao Shi, Anh D Le

    Clinical cancer research : an official journal of the American Association for Cancer Research   19 ( 12 )   3176 - 88   2013.6

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    PURPOSE: Osteonecrosis of the jaw (ONJ) is emerging as one of the important complications in cancer patients treated with antiresorptive agents. This study explored the potential role of interleukin (IL)-17-mediated M1/M2 macrophage alterations in the pathogenesis of bisphosphonate-related osteonecrosis of the jaw (BRONJ). EXPERIMENTAL DESIGN: The expression of IL-17 and M1 and M2 macrophage markers at the local mucosal site of human BRONJ lesions was examined by immunofluorescence studies. BRONJ-like disease was induced in C57BL/6 mice and multiple myeloma-burdened mice by intravenous injection of zoledronate to evaluate the correlation of elevated IL-17 levels with changes in M1 and M2 macrophage phenotypes and the therapeutic effects of blocking IL-17 on pathogenesis of BRONJ-like disease. RESULTS: Increased T-helper (TH)17 cells and IL-17 cytokine correlate with an increase in M1/M2 macrophages ratio at the local mucosal site of both murine and human BRONJ lesion. Convincingly, in mice burdened with multiple myeloma, a combination of elevated suprabasal level and drug-induced IL-17 activity augmented the incidence of BRONJ; both systemic increase of IL-17 and disease severity could be reversed by adoptive transfer of ex vivo expanded M2 macrophages. Targeting IL-17 via specific neutralizing antibodies or a small inhibitory molecule, laquinimod, significantly decreased M1/M2 ratio and concomitantly suppressed BRONJ-like condition in mice. Mechanistically, IL-17 enhanced IFN-γ-induced M1 polarization through augmenting STAT-1 phosphorylation while suppressing IL-4-mediated M2 conversion via inhibiting STAT-6 activation. CONCLUSIONS: These findings have established a compelling linkage between activated IL-17-mediated polarization of M1 macrophages and the development of BRONJ-like conditions in both human disease and murine models.

    DOI: 10.1158/1078-0432.CCR-13-0042

  • A subset of IL-17(+) mesenchymal stem cells possesses anti-Candida albicans effect. International journal

    Ruili Yang, Yi Liu, Peyman Kelk, Cunye Qu, Kentaro Akiyama, Chider Chen, Ikiru Atsuta, WanJun Chen, Yanheng Zhou, Songtao Shi

    Cell research   23 ( 1 )   107 - 21   2013.1

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    Bone marrow mesenchymal stem cells (MSCs) comprise a heterogeneous population of postnatal progenitor cells with profound immunomodulatory properties, such as upregulation of Foxp3(+) regulatory T cells (Tregs) and downregulation of Th17 cells. However, it is unknown whether different MSC subpopulations possess the same range of immunomodulatory function. Here, we show that a subset of single colony-derived MSCs producing IL-17 is different from bulk MSC population in that it cannot upregulate Tregs, downregulate Th17 cells, or ameliorate disease phenotypes in a colitis mouse model. Mechanistically, we reveal that IL-17, produced by these MSCs, activates the NFκB pathway to downregulate TGF-β production in MSCs, resulting in abolishment of MSC-based immunomodulation. Furthermore, we show that NFκB is able to directly bind to TGF-β promoter region to regulate TGF-β expression in MSCs. Moreover, these IL-17(+) MSCs possess anti-Candida albicans growth effects in vitro and therapeutic effect in C. albicans-infected mice. In summary, this study shows that MSCs contain an IL-17(+) subset capable of inhibiting C. albicans growth, but attenuating MSC-based immunosuppression via NFκB-mediated downregulation of TGF-β.

    DOI: 10.1038/cr.2012.179

  • Technetium-99 conjugated with methylene diphosphonate ameliorates ovariectomy-induced osteoporotic phenotype without causing osteonecrosis in the jaw. International journal

    Yinghua Zhao, Lei Wang, Yi Liu, Kentaro Akiyama, Chider Chen, Ikiru Atsuta, Tao Zhou, Xiaohong Duan, Yan Jin, Songtao Shi

    Calcified tissue international   91 ( 6 )   400 - 8   2012.12

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    Technetium-99 conjugated with methylene diphosphonate ((99)Tc-MDP) is a novel bisphosphonate derivative without radioactivity and has been successfully used to treat arthritis in China for years. Since bisphosphonate therapy has the potential to induce bisphosphonate-related osteonecrosis of the jaw (BRONJ), we examined whether (99)Tc-MDP represents a new class of bisphosphonate for antiresorptive therapy to ameliorate estrogen deficiency-induced bone resorption with less risk of causing BRONJ. We showed that (99)Tc-MDP-treated, ovariectomized (OVX) mice had significantly improved bone mineral density and trabecular bone volume in comparison to the untreated OVX group by inhibiting osteoclasts and enhancing osteogenic differentiation of bone marrow mesenchymal stem cells. To determine the potential of inducing BRONJ, (99)Tc-MDP/dexamethasone (Dex) or zoledronate/Dex was administered into C57BL/6J mice via the tail vein, followed by extraction of maxillary first molars. Interestingly, (99)Tc-MDP treatment showed less risk to induce osteonecrosis in the maxillary bones compared to zoledronate treatment group, partially because (99)Tc-MDP neither suppressed adaptive regulatory T cells nor activated the inflammatory T-helper-producing interleukin-17 cells. Taken together, our findings demonstrate that (99)Tc-MDP therapy may be a promising approach in the treatment of osteoporosis with less risk of causing BRONJ.

    DOI: 10.1007/s00223-012-9649-7

  • Effect of titanium surface calcium and magnesium on adhesive activity of epithelial-like cells and fibroblasts. International journal

    Hideyuki Okawachi, Yasunori Ayukawa, Ikiru Atsuta, Akihiro Furuhashi, Mami Sakaguchi, Koichi Yamane, Kiyoshi Koyano

    Biointerphases   7 ( 1-4 )   27 - 27   2012.12

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    In the present study, we investigated the hydrothermal treatment of titanium with divalent cation solutions and its effect in promoting the adhesion of gingival epithelial cells and fibroblasts in vitro. Gingival keratinocyte-like Sa3 cells or fibroblastic NIH3T3 cells were cultured for 1 h on experimental titanium plates hydrothermally-treated with CaCl(2) (Ca) or MgCl(2) (Mg) solution, or distilled water (DW). The number and adhesive strengths of attached cells on the substrata were then analyzed. The number of Sa3 cells adhering to the Ca- and Mg-treated plates was significantly larger than in the DW group, but the strength of this adhesion did not differ significantly between groups. In contrast, NIH3T3 cell adhesion number and strength were increased in both the Ca and Mg groups compared to the DW group. Fluorescent microscopic observation indicated that, in all groups, Sa3 had identical expression levels of integrin β4 and development of actin filaments, whereas NIH3T3 cells in the Ca and Mg groups displayed much stronger punctate cytoplasmic signals for vinculin and more bundle-shaped actin filaments than cells in the DW group. As a result, it was indicated that the hydrothermal treatment of titanium with Ca or Mg solution improved the integration of soft tissue cells with the substrata, which may facilitate the development of a soft tissue barrier around the implant.

    DOI: 10.1007/s13758-012-0027-9

  • Stem cells in dentistry--Part II: Clinical applications.

    Hiroshi Egusa, Wataru Sonoyama, Masahiro Nishimura, Ikiru Atsuta, Kentaro Akiyama

    Journal of prosthodontic research   56 ( 4 )   229 - 48   2012.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    New technologies that facilitate solid alveolar ridge augmentation are receiving considerable attention in the field of prosthodontics because of the growing requirement for esthetic and functional reconstruction by dental implant treatments. Recently, several studies have demonstrated potential advantages for stem-cell-based therapies in regenerative treatments. Mesenchymal stem/stromal cells (MSCs) are now an excellent candidate for tissue replacement therapies, and tissue engineering approaches and chair-side cellular grafting approaches using autologous MSCs represent the clinical state of the art for stem-cell-based alveolar bone regeneration. Basic studies have revealed that crosstalk between implanted donor cells and recipient immune cells plays a key role in determining clinical success that may involve the recently observed immunomodulatory properties of MSCs. Part II of this review first overviews progress in regenerative dentistry to consider the implications of the stem cell technology in dentistry and then highlights cutting-edge stem-cell-based alveolar bone regenerative therapies. Factors that affect stem-cell-based bone regeneration as related to the local immune response are then discussed. Additionally, pre-clinical stem cell studies for the regeneration of teeth and other oral organs as well as possible applications of MSC-based immunotherapy in dentistry are outlined. Finally, the marketing of stem cell technology in dental stem cell banks with a view toward future regenerative therapies is introduced.

    DOI: 10.1016/j.jpor.2012.10.001

  • The difference of fibroblast behavior on titanium substrata with different surface characteristics.

    Akihiro Furuhashi, Yasunori Ayukawa, Ikiru Atsuta, Hideyuki Okawachi, Kiyoshi Koyano

    Odontology   100 ( 2 )   199 - 205   2012.7

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    Connective tissue, one of the main components of peri-implant soft tissue, is key to the formation of the peri-implant mucosal seal and helping to prevent epithelial ingrowth. Rough surfaces (Rs), machined surfaces (Ms) or microgrooved surface (MG) are used in the neck area of commercially available titanium implants. In this paper, we aimed to evaluate the influence of surface topography of titanium substratum on connective tissue fibroblasts to gain a better understanding of this effect. Fibroblasts were cultured on titanium plates with Rs, Ms and MG. Adhesion cell number at day 3 was compared and protein distribution of both F-actin and vinculin was determined to observe cellular structure and adhesion. Cell adhesion strength was compared on each surface. At day 3, the number of fibroblasts attached on each substratum was in the order of MG ≈ Ms > Rs. Fibroblasts strongly expressed vinculin in the peripheral area on Ms and MG, and showed strong F-actin architecture. Decreased expression of vinculin and weaker continuity of F-actin were observed on Rs. Fibroblasts on MG were aligned along the grooves, with a significantly higher cell density, whereas cells on Ms and Rs had no clear orientation. The cell adhesion strength was significantly lower on Rs, and no significant difference was seen between MG and Ms. Both MG and Ms showed greater adhesion cell numbers and adhesion strength of fibroblasts when compared with Rs at day 3. The cell density on MG was greater than those on other substrata.

    DOI: 10.1007/s10266-011-0029-y

  • Stem cells in dentistry--part I: stem cell sources.

    Hiroshi Egusa, Wataru Sonoyama, Masahiro Nishimura, Ikiru Atsuta, Kentaro Akiyama

    Journal of prosthodontic research   56 ( 3 )   151 - 65   2012.7

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    Stem cells can self-renew and produce different cell types, thus providing new strategies to regenerate missing tissues and treat diseases. In the field of dentistry, adult mesenchymal stem/stromal cells (MSCs) have been identified in several oral and maxillofacial tissues, which suggests that the oral tissues are a rich source of stem cells, and oral stem and mucosal cells are expected to provide an ideal source for genetically reprogrammed cells such as induced pluripotent stem (iPS) cells. Furthermore, oral tissues are expected to be not only a source but also a therapeutic target for stem cells, as stem cell and tissue engineering therapies in dentistry continue to attract increasing clinical interest. Part I of this review outlines various types of intra- and extra-oral tissue-derived stem cells with regard to clinical availability and applications in dentistry. Additionally, appropriate sources of stem cells for regenerative dentistry are discussed with regard to differentiation capacity, accessibility and possible immunomodulatory properties.

    DOI: 10.1016/j.jpor.2012.06.001

  • Evaluations of epithelial sealing and peri-implant epithelial down-growth around "step-type" implants. International journal

    Ikiru Atsuta, Yasunori Ayukawa, Yoichiro Ogino, Yasuko Moriyama, Yohei Jinno, Kiyoshi Koyano

    Clinical oral implants research   23 ( 4 )   459 - 66   2012.4

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    OBJECTIVE: Implant designs that can stimulate and integrate with an epithelial wound-healing process may significantly enhance the efficacy of dental implants. Here, we evaluated the potential of "step-type" implant systems to improve the sealing between the peri-implant epithelium (PIE) and the implant surface, and investigated the effect of implant structure on PIE down-growth. MATERIALS AND METHODS: Right maxillary first molars were extirpated from rats and implanted with either a straight-type or a step-type implant varying in step height and/or width (N(s): 0.8 mm height, 0.1 mm width; W(s): 0.8 mm height, 0.2 mm width; H(s): 0.4 mm height, 0.1 mm width). Maxillae were harvested at various time points over 16 weeks to evaluate laminin-5 distribution as an indicator of wound healing and PIE formation, horse-radish peroxidase (HRP) penetration as a measurement of epithelial sealing, and PIE down-growth formation. RESULTS: In all implant models, the PIE formed from the oral sulcular epithelium and spread apically along the implant surface. In the W(s) group, HRP penetration was detected only in the coronal region of the PIE at 4 weeks, whereas in the straight-type, it was observed in the apical region and the connective tissue. At 16 weeks, the W(s) implants exhibited markedly less PIE down-growth than the Con, N(s) or H(s) implants, and were equivalent to that observed in natural teeth. CONCLUSION: The step-type implant system may have the potential for improving epithelial sealing at the tissue-implant interface, as well as reducing apical PIE down-growth, thus enhancing dental implant efficacy.

    DOI: 10.1111/j.1600-0501.2011.02163.x

  • The effect of a single remote injection of statin-impregnated poly (lactic-co-glycolic acid) microspheres on osteogenesis around titanium implants in rat tibia. International journal

    Tomohiro Masuzaki, Yasunori Ayukawa, Yasuko Moriyama, Yohei Jinno, Ikiru Atsuta, Yoichiro Ogino, Kiyoshi Koyano

    Biomaterials   31 ( 12 )   3327 - 34   2010.4

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    The aim of this study was to evaluate the effects of newly developed injectable poly (lactic-co-glycolic acid) (PLGA) microspheres containing fluvastatin on osteogenesis around titanium implants in the rat tibia. After confirmation of the sustained-release profile of fluvastatin from the microspheres by an in vitro assay, the microspheres were administered to the back skin of the rats by a single transdermal injection. At 2 and 4 weeks after the implant surgery, the fluvastatin groups showed enhanced new bone formation around the titanium implants without any influence on the serum biochemistry. In addition, the fluvastatin groups showed increased three-point bending strengths of their femurs. The results of this study indicate that a single remote injection of PLGA/fluvastatin microspheres safely and successfully stimulated bone formation around titanium implants and increased the mechanical properties of bone.

    DOI: 10.1016/j.biomaterials.2010.01.016

  • Local application of fluvastatin improves peri-implant bone quantity and mechanical properties: a rodent study. International journal

    Yasuko Moriyama, Yasunori Ayukawa, Yoichiro Ogino, Ikiru Atsuta, Mitsugu Todo, Yoshihiro Takao, Kiyoshi Koyano

    Acta biomaterialia   6 ( 4 )   1610 - 8   2010.4

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    Statins are known to stimulate osteoblast activity and bone formation. This study examines whether local application of fluvastatin enhances osteogenesis around titanium implants in vivo. Ten-week-old rats received a vehicle gel (propylene glycol alginate (PGA)) or PGA containing fluvastatin (3, 15, 75 or 300 microg) in their tibiae just before insertion of the implants. For both histological and histomorphometric evaluations undecalcified ground sections were obtained and the bone-implant contact (BIC), peri-implant osteoid volume and mineralized bone volume (MBV) were calculated after 1, 2 and 4 weeks. Using the same models mechanical push-in tests were also performed to evaluate the implant fixation strength. After 1 week the MBV and push-in strength were significantly lower in the 300 microg fluvastatin-treated group than in the other groups (P<0.01). At 2 weeks, however, the BIC and MBV were both significantly higher in the 75 microg fluvastatin-treated group than in the non-fluvastatin-treated groups (P<0.01). Similar tendencies were observed at week 4. Furthermore, the data showed a good correlation between the MBV and the push-in strength. These results demonstrate positive effects of locally applied fluvastatin on the bone around titanium implants and suggest that this improvement in osseointegration may be attributed to calcification of the peri-implant bone.

    DOI: 10.1016/j.actbio.2009.10.045

  • インプラント周囲骨形成に対するスタチン遠隔単回投与の効果 骨粗鬆症モデルラットを用いた組織学的研究

    益崎 与泰, 鮎川 保則, 森山 泰子, 熱田 生, 神野 洋平, 古谷野 潔

    日本再生歯科医学会誌   7 ( 1 )   86 - 86   2009.12

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  • Vertical bone augmentation with fluvastatin in an injectable delivery system: a rat study. International journal

    Yohei Jinno, Yasunori Ayukawa, Yoichiro Ogino, Ikiru Atsuta, Yoshihiro Tsukiyama, Kiyoshi Koyano

    Clinical oral implants research   20 ( 8 )   756 - 60   2009.8

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    OBJECTIVES: HMG-CoA reductase inhibitors (statins) are widely used for hyperlipidemia. Previous studies demonstrate that statins stimulate bone morphogenetic protein-2 (BMP-2) expression and lead to bone formation. The aim of this study was to evaluate whether percutaneously injected statin with a novel statin delivery system achieved vertical bone augmentation. MATERIAL AND METHODS: As experimental groups, atelocollagen-alpha-tricalcium phosphate (alphaTCP) composites containing 3.3 mg (low dose) or 6.7 mg (high dose) of fluvastatin were injected (one shot) subcutaneously over the calvarial periosteum of rats. The animals were then sacrificed 1, 2, and 4 weeks after injection. Vertically augmented bone was assessed by histomorphometric procedures, i.e., by measuring new bone thickness (NBT) and bone density (BD). RESULTS: In control groups, no newly formed bone could be seen over the calvarial bone. In the experimental groups, in contrast, a large amount of newly formed bone could be seen over the preexisting calvarial bone. The newly formed bone was seen to be in direct contact with the preexisting bone. During the entire observation, significant NBT was observed in the experimental groups (P<0.05). At the final stage of observation (4 weeks), NBT was 66.7&#37; (low-dose group) and 59.7&#37; (high-dose group), while they were from 1&#37; to 16.3&#37; in the control groups. In the experimental groups, BD significantly increased in a time-dependent manner. CONCLUSION: Percutaneously applied fluvastatin (one shot) with a composite of alphaTCP and collagen has great potential to augment the height of the bone.

    DOI: 10.1111/j.1600-0501.2008.01665.x

  • Local application of statin promotes bone repair through the suppression of osteoclasts and the enhancement of osteoblasts at bone-healing sites in rats. International journal

    Yasunori Ayukawa, Eisuke Yasukawa, Yasuko Moriyama, Yoichiro Ogino, Hiroko Wada, Ikiru Atsuta, Kiyoshi Koyano

    Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics   107 ( 3 )   336 - 42   2009.3

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    OBJECTIVE: We investigated whether the local administration of simvastatin affected both the cellular events and the bone formation at surgically created bone defects in rat. STUDY DESIGN: Simvastatin (or a vehicle) was injected into a rat bony defect for 3 consecutive days from the day of surgery. Five or ten days after the injection, new bone tissue was collected, and the gene expressions of bone-related proteins were examined. For the histomorphometry, new bone area was measured. RESULTS: At day 5, the statin group demonstrated significantly larger new bone area. The number of tartrate-resistant acid phosphatase-positive multinucleated cells in the statin group was less than in the control group. In the statin group, the expressions of both alkaline phosphatase and bone morphogenetic protein 2 mRNA significantly increased. In contrast, the expression of cathepsin K was significantly suppressed in the statin group. Although the levels of both RANK and osteoprotegerin were not affected by statin, the expression of RANKL was depressed. At day 10, there were no significant differences among the groups in either histomorphometric or reverse-transcription polymerase chain reaction analyses. CONCLUSION: New bone area increased under the influence of simvastatin; however, the effect did not continue when the administration was terminated. Osteoclast suppression may be the consequence of RANKL depression.

    DOI: 10.1016/j.tripleo.2008.07.013

  • プラットホームスイッチングシステムは上皮封鎖性の向上に有効か?

    熱田 生, 鮎川 保則, 荻野 洋一郎, 森山 泰子, 神野 洋平, 古橋 明大, 古谷野 潔

    日本口腔インプラント学会誌   21 ( 特別号 )   137 - 137   2008.8

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  • Topical application of statin affects bone healing around implants. International journal

    Yasuko Moriyama, Yasunori Ayukawa, Yoichiro Ogino, Ikiru Atsuta, Kiyoshi Koyano

    Clinical oral implants research   19 ( 6 )   600 - 5   2008.6

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    OBJECTIVES: 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) are widely used for hyperlipidemia. Recent studies demonstrate that statins stimulate bone morphogenetic protein-2 expression and lead to bone formation. The aim of this study was to evaluate whether the topical application of statin enhances the osteogenesis around a titanium implant. MATERIALS AND METHODS: Ten-week-old female rats received pure titanium rods in both tibiae with or without fluvastatin. Propylene glycol alginate (PGA) was used as a carrier. The rats were divided into five groups: implant-only group, implant with PGA group, low-dose group [implant+PGA containing 3 microg of fluvastatin (FS)], medium-dose group (15 microg of FS), and high-dose group (75 microg of FS). The animals were sacrificed at 1 and 2 weeks after implantation. Peri-implant bone formation was assessed by histomorphometric procedures, i.e., measuring the bone-implant contact (BIC) and peri-implant bone volume (BV). A mechanical push-out test was also performed to evaluate the implant fixation strength. Statistical differences among the groups were determined by ANOVA and P < 0.05 was considered significant. RESULTS: At week 1, there was no significant difference in BIC among the groups, however, BV and the push-out strength were significantly higher in the high-dose group than in the implant-only group. At week 2, BIC and BV had significantly increased in the high-dose group in comparison with the non-statin groups. The fluvastatin-treatment group showed a significant increase in push-out strength compared with the non-statin groups. CONCLUSION: Our histomorphometrical and mechanical evaluations revealed the positive effect of topically applied fluvastatin on the bone around the implant.

    DOI: 10.1111/j.1600-0501.2007.01508.x

  • 新規ドラッグデリバリーシステムを用いたスタチンによる骨増生

    神野 洋平, 鮎川 保則, 荻野 洋一郎, 熱田 生, 古谷野 潔

    日本口腔インプラント学会誌   21 ( 1 )   77 - 78   2008.3

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  • Sequential expression of endothelial nitric oxide synthase, inducible nitric oxide synthase, and nitrotyrosine in odontoblasts and pulp cells during dentin repair after tooth preparation in rat molars. International journal

    Yu Feng Mei, Takayoshi Yamaza, Ikiru Atsuta, Atsushi Danjo, Yoshio Yamashita, Mizuho A Kido, Masaaki Goto, Akifumi Akamine, Teruo Tanaka

    Cell and tissue research   328 ( 1 )   117 - 27   2007.4

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    Nitric oxide (NO) stimulates osteoblast differentiation, but whether NO contributes to odontoblast differentiation during dentin repair is unknown. By using reverse transcription/polymerase chain reaction and immunostaining, we investigated the gene expression and/or immunolocalization of endothelial NO synthase (eNOS), inducible NOS (iNOS), and nitrotyrosine (a biomarker for NO-derived peroxinitrite), and alkaline phosphatase (ALP) and osteocalcin (early and terminal differentiation markers of odontoblasts, respectively) in dental pulp tissue after rat tooth preparation. At the early stage (1-3 days) post-preparation, markedly increased expression of iNOS and nitrotyrosine was found in odontoblasts and pulp cells beneath the cavity, whereas eNOS expression was significantly decreased. ALP mRNA expression was significantly increased after 1 day but decreased after 3 days, whereas ALP activity was weak in the dentin-pulp interface under the cavity after 1 day but strong after 3 days. Osteocalcin mRNA expression was significantly increased at this stage. At 7 days post-preparation, tertiary dentin was formed under the cavity. All the molecules studied were expressed at control levels in odontoblasts/pulp cells beneath the cavity. These findings show that abundant NO is released from odontoblasts and pulp cells at an early stage after tooth preparation and indicate that, after tooth preparation, the up-regulation of iNOS and nitrotyrosine in odontoblasts is synchronized with increased cellular expression of ALP and osteocalcin. Therefore, the NO synthesized by iNOS after tooth preparation probably participates in regulating odontoblast differentiation during tertiary dentinogenesis.

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Presentations

  • ONJの病因論と細胞治療の可能性

    熱田 生

    公益社団法人日本補綴歯科学会 第124回学術大会  2015.5 

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    Event date: 2016.5

    Language:Japanese  

    Country:Japan  

  • 解剖学的に見る概形印象の重要性

    熱田 生

    公益社団法人日本補綴歯科学会 第123回学術大会  2014.5 

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    Event date: 2016.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台   Country:Japan  

  • インプラント周囲の軟組織封鎖性はどこまで明らかにされているか?

    熱田 生

    社団法人日本補綴歯科学会第124回学術大会  2015.9 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Venue:岡山   Country:Japan  

  • インプラント表面への口腔上皮細胞の接着に対するIGF-Ιの効果

    ○熱田 生, 鮎川 保則, 荻野 洋一郎, 安川 英輔, 古谷野 潔

    第115回(社)日本補綴歯科学会学術大会  2006.7 

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    Venue:札幌   Country:Japan  

  • インプラント表面性状の違いがラット口腔粘膜上皮に与える影響

    熱田 生

    社団法人日本補綴歯科学会第121回学術大会 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Inhibitory effects of Mesenchymal Stem Cells for myeloma cells.

    ATSUTA IKIRU

    Seminar in Center for Craniofacial Molecular Biology  2011.11 

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    Country:Japan  

  • インプラント周囲上皮封鎖性の向上を目指した間葉系幹細胞治療 Invited

    熱田 生, 鮎川 保則, 古谷野 潔

    公益社団法人日本補綴歯科学会 第122回学術大会  2013.6 

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    Country:Japan  

  • インプラント周囲における上皮封鎖性のしくみについて Invited

    熱田 生, 鮎川 保則, 古谷野 潔

    第56回春季日本歯周病学会学術大会  2013.5 

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    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • インプラント表面性状の違いがラット口腔粘膜上皮に与える影響

    熱田 生, 鮎川 保則, 古谷野 潔

    社団法人日本補綴歯科学会第121回学術大会  2012.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Injection timing of Mesenchymal Stem Cells to promote the soft tissue sealing around titanium implant International conference

    ATSUTA IKIRU, Yasunori AYUKAWA, kiyoshi koyano

    Biennial Joint Congress of CPS-JPS-KAP  2013.4 

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    Country:Korea, Republic of  

  • Mesenchymal stem cells promote soft tissue sealing around titanium implants International conference

    ATSUTA IKIRU, Yasunori AYUKAWA, kiyoshi koyano

    86th Annual Meeting of the American Prosthodontic Society  2014.2 

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    Language:English  

    Country:United States  

  • インプラント表面性状の違いがラット口腔粘膜上皮に与える影響

    熱田 生

    社団法人日本補綴歯科学会第121回学術大会 

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    Country:Japan  

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  • 歯冠補綴装置に上皮付着は存在するか?(ブリッジのポンティック底部は口腔粘膜と接着するのか?)

    熱田 生, 鮎川保則, 森本太一郎, 古橋明大, 成松生枝, 近藤綾介, 古谷野潔

    平成29年度 日本歯科理工学会九州地方会夏期セミナー  2017.8 

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    Event date: 2018.8

    Language:Japanese  

    Venue:北九州市旧大阪商船2F「海峡ロマンホール」.   Country:Japan  

  • ジルコニア製インプラントにおける軟組織封鎖性の検討(ラットを用いた実験)

    熱田 生, 鮎川保則, 古橋明大, 成松生枝, 古谷野潔

    平成28年度日本歯科理工学会九州地方会夏期セミナー  2016.8 

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    Event date: 2018.6

    Language:Japanese  

    Country:Japan  

  • ブリッジにおけるポンティック底部は口腔粘膜と接着するのか?

    熱田 生, 鮎川保則, 森本太一郎, 古橋明大, 成松生枝, 近藤綾介, 古谷野潔

    日本補綴歯科学会第126回学術大会  2017.7 

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    Event date: 2018.6

    Language:Japanese  

    Country:Japan  

  • 歯冠補綴装置に上皮付着は存在するか?

    熱田 生, 鮎川保則, 古橋明大, 成松生枝, 古谷野潔

    平成29年度日本歯科理工学会九州地方会夏期セミナー  2017.8 

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    Event date: 2018.6

    Language:Japanese  

    Country:Japan  

  • アスピリンを用いたインプラント周囲上皮封鎖性に対する間葉系幹細胞効果の増強

    熱田 生, 鮎川 保則, 近藤 綾介, 松浦 由梨, 古橋 明大, 成松 生枝, 上田 将之, 古谷野 潔

    公益社団法人日本口腔インプラント学会. 第35回九州支部学術大会  2018.1 

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    Event date: 2018.1

    Language:Japanese  

    Venue:北九州国際会議場.   Country:Japan  

  • インプラント周囲における軟組織封鎖を基礎から考える Invited

    熱田 生

    東京インプラント研究会  2017.10 

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    Event date: 2017.10 - 2018.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 精密義歯BPSデンチャーの臨床 Invited

    熱田 生

    平成29年度高松市歯科医師会学術講演  2017.10 

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    Event date: 2017.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高松市歯科医師会   Country:Japan  

  • 基礎から見直す全部床義歯の臨床

    熱田 生

    九州大学病院再生歯科・インプラント研究会.  2017.8 

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    Event date: 2017.8

    Language:Japanese  

    Venue:福岡   Country:Japan  

  • インプラントオーバーデンチャーをメインテナンスから「再考」する Invited

    熱田 生

    8020セミナー  2017.2 

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    Event date: 2017.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • インプラント周囲軟組織における封鎖性の解明について

    熱田生

    日本口腔インプラント学会第39回学術大会  2009.9 

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    Event date: 2009.9 - 2010.12

    Language:Others   Presentation type:Symposium, workshop panel (public)  

    Venue:大阪   Country:Japan  

  • Comparative Studies of the peri-implant epithelium of rat gingivae between “platform-switched” and “non-switched” implant system International conference

    Ikiru Atsuta, Yasunori Ayukawa, Yoichiro Ogino, Kiyoshi Koyano

    5th Biennial Congress of Asian Academy of Prosthodontics 

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    Country:Japan  

  • Role of PI3-kinase on adhesion of oral epithelial cells to titanium International conference

    Ikiru Atsuta1, Yasunori Ayukawa1, Yoichiro Ogino1, Masao Yoshinari2, Teruo Tanaka3, Kiyoshi Koyano1

    第3回大韓補綴歯科学会・日本補綴歯科学会合同学術大会 

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    Country:Japan  

  • 新義歯作製に向けた下顎位の安定をゴシックアーチにより評価した症例

    ○ 熱田 生, 鳥谷 浩平, 鮎川 保則, 荻野 洋一郎, 古谷野 潔

    平成18年度日本補綴歯科学会九州支部学術大会(鹿児島10/22) 

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    Country:Japan  

  • インプラント周囲上皮の再生研究と今後の展望について

    ○熱田生, 鮎川保則, 山座孝義, 荻野洋一郎, 安川英輔, 田中輝男, 古谷野潔

    平成18年度日本補綴歯科学会九州支部学術大会(鹿児島10/22) 

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    Language:Others  

    Country:Japan  

  • インプラント周囲上皮の再生研究と今後の展望について

    ○熱田生, 鮎川保則, 山座孝義, 荻野洋一郎, 安川英輔, 田中輝男, 古谷野潔

    第2回口腔組織の再生・再建医療研究プロジェクトセミナー 

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    Country:Japan  

  • インプラント埋入後の歯肉の治癒過程

    第44回 歯科基礎医学会学術大会  2002.1 

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    Venue:東京   Country:Japan  

  • インプラント治療のための付着上皮再生

    第1回 口腔組織の再生の総合的開発研究会 九州大学リサーチコア(歯学研究会)  2003.1 

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    Venue:福岡   Country:Japan  

  • チタンプレート上における口腔粘膜上皮細胞の動態について

    第32回 九大生体材料・力学研究会 

  • チタンプレートに対する口腔粘膜上皮細胞接着でのphosphatidylinositol 3 kinaseの役割について

    第25回 日本バイオマテリアル学術大会 

  • Effect of wortmannin on adhesion of oral keratinocytes to titanium.

    82nd International Association for Dental Research, Hawaii, 2004 

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    Country:United States  

  • チタンへの口腔粘膜上皮細胞の接着に対するインスリン様増殖因子—1(IGF-1)の効果

    第46回 歯科基礎医学会学術大会 

  • Comparative Studies of the peri-implant epithelium of rat gingivae between “platform-switched” and “non-switched” implant system. International conference

    ○Atsuta I, Ayukawa Y, Ogino Y, Koyano K.

    5th Biennial Congress of Asian Academy of Prosthodontics.  2007.4 

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    Venue:Kobe   Country:Japan  

  • Peri-implant epithelium around “platform-switched” implant. International conference

    ○Atsuta I, Ayukawa Y, Ogino Y, Moriyama Y, Jinno Y, Koyano K.

    European Associaton for Osseointegration 16th Annual Scientific Meeting.  2007.10 

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    Country:Japan  

  • カルシウム修飾およびマグネシウム修飾が上皮細胞および線維芽細胞のチタン接着性に与える影響について

    熱田 生, 鮎川 保則, 古谷野 潔

    第33回日本バイオマテリアル学会大会  2011.11 

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    Country:Japan  

  • いつまでも美味しく食べるための歯科医療

    熱田 生

    第27回佐賀NST研究会  2023.6 

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  • インプラント周囲組織構築に向けた 間葉系幹細胞の応用

    熱田 生

    日本口腔インプラント学会 第53回学術大会  2023.9 

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  • 解剖学から考える全部床義歯治療を 成功に導くポイント

    熱田 生

    中津歯科医師会 定期講演会  2023.3 

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  • ポンティック周囲における軟組織構造を基礎研究から考える

    熱田 生

    第7回補綴歯科臨床研鑽会「プロソ’22」  2022.10 

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  • インプラント周囲における軟組織封鎖性を考える

    熱田 生

    日本口腔インプラント学会 第51回学術大会  2021.12 

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  • 若手歯科医師が初めて全部床義歯症例を担当するときに押さえておきたいポイント

    熱田 生

    Doctorbook Academy 1Day総義歯セミナー はじめての全部床義歯 成功へのポイント  2019.11 

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  • オルガノイドカルチャーに向けたスキャフォールドの検討.

    古橋明大, 鮎川保則, 熱田生, ラフマティアユニアドゥイ, 安波礼之, 古谷野潔

    平成29年度 日本歯科理工学会九州地方会夏期セミナー.  2018.8 

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  • Back to the Basics -ゴシックアーチは本当に必要か? -

    熱田 生

    日本補綴歯科学会第126回学術大会.  2017.7 

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  • インプラント周囲組織における生物学的幅径及び軟組織封鎖性の検討.

    成松生枝, 鮎川保則, 熱田生, 大城和可奈, 安波礼之, 古橋明大, 古谷野潔

    日本補綴歯科学会第126回学術大会.  2017.7 

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  • インプラント表面性状の違いが上皮および結合組織による軟組織封鎖性に与える影響.

    成松生枝, 鮎川保則, 熱田生, 大城和可奈, 安波礼之, 古橋明大, 古谷野潔

    第47回公益社団法人日本口腔インプラント学会学術大会.  2017.9 

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  • ジルコニア製インプラントにおける軟組織封鎖性の検討.

    熱田生, 鮎川保則, 古橋明大, 成松生枝, 古谷野潔

    日本歯科理工学会. 九州地方会夏期セミナー  2016.8 

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  • 全部床義歯を進化させる(新技術と伝統の融合)インプラントオーバーデンチャーをメインテナンスから再考する.

    熱田 生

    歯科医学会  2016.10 

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  • 各種歯冠補綴材料による対合エナメル質の摩耗:表面性状と接触状態の違いによる評価.

    橘慶州, 桑鶴利香, 築山能大, 熱田生, 森田健敬, 川上裕嗣, 野間公介, 松下恭之, 澤江義則, 古谷野潔

    第125回日本補綴歯科学会学術大会.  2016.7 

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  • インプラント周囲組織における生物学的幅径及び軟組織封鎖性の検討.

    成松生枝, 鮎川保則, 熱田生, 大城和可奈, 安波礼之, 古橋明大, 古谷野潔

    日本補綴歯科学会第126回学術大会.  2017.7 

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  • インプラント表面性状の違いが上皮および結合組織による軟組織封鎖性に与える影響.

    成松生枝, 鮎川保則, 熱田生, 大城和可奈, 安波礼之, 古橋明大, 古谷野潔

    第47回公益社団法人日本口腔インプラント学会学術大会.  2017.9 

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  • ジルコニア製インプラントにおける軟組織封鎖性の検討.

    熱田生, 鮎川保則, 古橋明大, 成松生枝, 古谷野潔

    日本歯科理工学会. 九州地方会夏期セミナー  2016.8 

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  • 全部床義歯を進化させる(新技術と伝統の融合)インプラントオーバーデンチャーをメインテナンスから再考する.

    熱田 生

    歯科医学会  2016.10 

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  • 各種歯冠補綴材料による対合エナメル質の摩耗:表面性状と接触状態の違いによる評価.

    橘慶州, 桑鶴利香, 築山能大, 熱田生, 森田健敬, 川上裕嗣, 野間公介, 松下恭之, 澤江義則, 古谷野潔

    第125回日本補綴歯科学会学術大会.  2016.7 

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  • 解剖学から考える全部床義歯治療を 成功に導くポイント

    熱田 生

    中津歯科医師会 定期講演会  2023.3 

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  • 薬剤関連顎骨壊死に対するベニジピンの治療効果の検証

    松中 健, 今井 実喜生, 三田 公麿, 安波 礼之, 古橋 明大, 熱田 生, 鮎川 保則

    日本口腔インプラント学会誌  2022.9  (公社)日本口腔インプラント学会

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  • 義歯調整におけるリマウント法の有効性の検討(Re-consideration of clinical remounting of existing complete dentures)

    鄭 繼祥, 熱田 生, 古谷野 潔, 鮎川 保則

    日本補綴歯科学会誌  2023.5  (公社)日本補綴歯科学会

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  • 炭酸アパタイト製骨補填材と自家骨との併用による骨形成への有用性について

    熱田 生, 溝上 宗久, 神野 洋平, 成松 生枝, 高橋 良輔, 江頭 優希, 鮎川 保則

    日本口腔インプラント学会誌  2023.3  (公社)日本口腔インプラント学会

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  • 炭酸アパタイト製骨補填材が間葉系幹細胞に及ぼす影響について

    高橋 良輔, 熱田 生, 成松 生枝, 張 暁旭, 江頭 優希, 古谷野 潔, 鮎川 保則

    日本口腔インプラント学会誌  2022.9  (公社)日本口腔インプラント学会

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  • 未来のインプラント治療に貢献しうる幹細胞研究 インプラント周囲における幹細胞の異常性とその治療法を考える

    熱田 生

    日本口腔インプラント学会誌  2023.9  (公社)日本口腔インプラント学会

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  • 新義歯作製に向けた下顎位の安定をゴシックアーチにより評価した症例

    ○ 熱田 生, 鳥谷 浩平, 鮎川 保則, 荻野 洋一郎, 古谷野 潔

    平成18年度日本補綴歯科学会九州支部学術大会(鹿児島10/22) 

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  • 抜歯窩に填入した炭酸アパタイト製骨補填材を被覆する口腔粘膜の治癒について

    江頭 優希, 熱田 生, 成松 生枝, 張 暁旭, 高橋 良輔, 古谷野 潔, 鮎川 保則

    日本口腔インプラント学会誌  2022.9  (公社)日本口腔インプラント学会

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  • 基礎研究から考える「サイトランスグラニュールの臨床応用法」

    熱田 生

    日本口腔科学会雑誌  2022.7  (NPO)日本口腔科学会

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  • 上口唇有棘細胞癌術後開口障害患者における複製義歯を用いた義歯形態の模索(Scrutinintion of the outline form of complete dentures with duplicate dentures in a patient with upper lip squamous cell carcinoma: A case report)

    鄭 繼祥, 神野 洋平, 熱田 生, 鮎川 保則

    日本補綴歯科学会誌  2022.11  (公社)日本補綴歯科学会

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  • ポンティック周囲における軟組織構造を基礎研究から考える

    熱田 生

    第7回補綴歯科臨床研鑽会「プロソ’22」  2022.10 

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    Presentation type:Symposium, workshop panel (nominated)  

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  • チタンプレート上における口腔粘膜上皮細胞の動態について

    第32回 九大生体材料・力学研究会 

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  • チタンプレートに対する口腔粘膜上皮細胞接着でのphosphatidylinositol 3 kinaseの役割について

    第25回 日本バイオマテリアル学術大会 

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  • チタンへの口腔粘膜上皮細胞の接着に対するインスリン様増殖因子—1(IGF-1)の効果

    第46回 歯科基礎医学会学術大会 

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  • オーラルアプライアンス装着による睡眠時プラキシズムおよび睡眠の質への影響

    大木 郷資, 築山 能大, 熱田 生, 金子 めぐみ, 鮎川 保則, 古谷野 潔

    日本顎関節学会雑誌  2022.7  (一社)日本顎関節学会

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  • インプラント周囲組織構築に向けた 間葉系幹細胞の応用

    熱田 生

    日本口腔インプラント学会 第53回学術大会  2023.9 

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  • インプラント周囲上皮の再生研究と今後の展望について

    ○熱田生, 鮎川保則, 山座孝義, 荻野洋一郎, 安川英輔, 田中輝男, 古谷野潔

    第2回口腔組織の再生・再建医療研究プロジェクトセミナー 

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  • インプラント周囲上皮の再生研究と今後の展望について

    ○熱田生, 鮎川保則, 山座孝義, 荻野洋一郎, 安川英輔, 田中輝男, 古谷野潔

    平成18年度日本補綴歯科学会九州支部学術大会(鹿児島10/22) 

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  • インプラント周囲における炭酸アパタイトと自家骨填入後の硬組織および軟組織の変化(Effects of Bone Graft with Carbonate Apatite or Autogenous Bone on Tissue Integration with the Titanium Implant Surface)

    解 汀雨, 熱田 生, 成松 生枝, 紀 斌, 古谷野 潔, 鮎川 保則

    日本口腔インプラント学会誌  2024.3  (公社)日本口腔インプラント学会

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  • いつまでも美味しく食べるための歯科医療

    熱田 生

    第27回佐賀NST研究会  2023.6 

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  • SrTiO3ナノコーティング及び紫外線照射がPEEK表面への骨形成・軟組織付着に与える影響(Effect of magnetron sputtering nano-scale SrTiO3 coating with UV irradiation on the osteogenic activity and soft tissue sealing function of PEEK)

    陳 天杰, 神野 洋平, 熱田 生, 鮎川 保則

    日本補綴歯科学会誌  2022.11  (公社)日本補綴歯科学会

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  • Role of PI3-kinase on adhesion of oral epithelial cells to titanium International conference

    Ikiru Atsuta1, Yasunori Ayukawa1, Yoichiro Ogino1, Masao Yoshinari2, Teruo Tanaka3, Kiyoshi Koyano1

    第3回大韓補綴歯科学会・日本補綴歯科学会合同学術大会 

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  • P(LA/CL)二層性メンブレン周囲における粘膜治癒について

    熱田 生, 成松 生枝, 古谷野 潔, 鮎川 保則

    日本補綴歯科学会誌  2022.7  (公社)日本補綴歯科学会

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  • P(LA/CL)二層性メンブレンのGBR適応における有用性

    熱田 生, 成松 生枝, 張 暁旭, 高橋 良輔, 江頭 優希, 古谷野 潔, 鮎川 保則

    日本口腔インプラント学会誌  2022.3  (公社)日本口腔インプラント学会

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  • Effect of wortmannin on adhesion of oral keratinocytes to titanium.

    82nd International Association for Dental Research, Hawaii, 2004 

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  • Comparative Studies of the peri-implant epithelium of rat gingivae between “platform-switched” and “non-switched” implant system International conference

    Ikiru Atsuta, Yasunori Ayukawa, Yoichiro Ogino, Kiyoshi Koyano

    5th Biennial Congress of Asian Academy of Prosthodontics 

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  • 【審美領域へのインプラント治療の成功基準】インプラント周囲における軟組織封鎖性を考える

    熱田 生, 古谷野 潔, 鮎川 保則

    日本口腔インプラント学会誌   36 ( 1 )   32 - 38   2023.3   ISSN:0914-6695

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    口腔インプラント治療は欠損補綴において重要な選択肢となっている.インプラント体を口腔内で機能させるためには骨組織との結合性が重要であることは以前から知られているが,その機能を長期間継続させるには軟組織による封鎖性が不可欠であることも忘れてはいけない.この封鎖機構は,天然歯周囲に存在する生物学的幅径と類似した構造を有している.しかし,インプラント周囲における封鎖機能は,天然歯周囲と比較して明らかに低く脆弱である.その原因として,骨に直接埋入される口腔インプラントの周囲では歯根膜が存在せず,解剖学的に血流が不足していることが挙げられる.さらに組織学的にインプラント体と接着する上皮などの封鎖構造が天然歯と比べて明らかに限局的で少なく,上皮細胞のチタンに対する接着性がそもそも低いことなどから,わずかに存在する接着構造も封鎖機能が低いとされている.そのため,このインプラント周囲における軟組織封鎖性を向上させるため,インプラント体の材質,表面性状,さらに周囲組織の細胞活性に関するさまざまな研究が現在も進められているわけである.このような基礎的研究に対する理解は,適応症例の選別やインプラント体や手技の選択,さらには軟組織を考慮したメインテナンスの実践に役立ち,インプラント治療の長期間の成功につながると期待している.(著者抄録)

  • 初めてのサイトランス®グラニュール

    今井実喜生, 熱田 生, 鮎川保則

    デンタルダイヤモンド 2022年4月号   2022.4

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  • クリニカル・アドバンス 初めてのサイトランスグラニュール ソケットプリザベーション(顎堤保存術)における活用

    今井 実喜生, 熱田 生, 鮎川 保則

    DENTAL DIAMOND   47 ( 5 )   168 - 175   2022.4   ISSN:0386-2305

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  • 初めてのサイトランス®グラニュール

    今井実喜生, 熱田 生, 鮎川保則

    デンタルダイヤモンド 2022年4月号   2022.4

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  • 間葉系幹細胞の研究から考える生物科学としての補綴歯科治療

    熱田生, 秋山謙太郎, 加来賢

    日本補綴歯科学会誌(Web)   2021.2

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    Prosthodontics as biological science-mesenchymal stem cell perspective-

  • ラット抜歯窩の治癒過程から見る炭酸アパタイト製骨補填材の有効性

    張 暁旭, 熱田 生, 鮎川 保則, 成松 生枝, 上田 将之, 高橋 良輔, 江頭 優希, 張 旌旗, 顧 炯炎, 古谷野 潔

    日本歯科理工学会誌   2020.12

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  • 炭酸アパタイト製骨補填材が口腔粘膜の治癒に及ぼす影響について

    熱田 生, 江頭 優希, 鮎川 保則, 成松 生枝, 張 暁旭, 杉 友貴, 高橋 良輔, 古谷野 潔

    日本口腔インプラント学会誌   2020.9

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  • ラット抜歯モデルを用いた炭酸アパタイト製骨補填材の有用性の検討

    張 暁旭, 熱田 生, 鮎川 保則, 成松 生枝, 上田 将之, 張 旌旗, 顧 炯炎, 古谷野 潔

    日本口腔インプラント学会誌   2020.9

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  • 【はじめての全部床義歯】(Chapter 6)診療2日目 最終印象/ろう堤付きトレーを用いた方法

    大木 郷資, 熱田 生

    歯界展望   2019.11

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  • 【はじめての全部床義歯】(Chapter 9)診療3日目 咬合採得 水平的顎間関係

    近藤 綾介, 熱田 生

    歯界展望   2019.11

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  • 【はじめての全部床義歯】(Chapter 15)診療6日目 義歯装着

    古橋 明大, 熱田 生

    歯界展望   2019.11

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  • 【はじめての全部床義歯】(Chapter 3)診療1日目 概形印象

    今井 実喜生, 熱田 生

    歯界展望   2019.11

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  • 口腔粘膜上皮はブリッジのポンティック底部に対して接着性を有するか?

    熱田 生, 鮎川 保則, 森本 太一朗, 古橋 明大, 成松 生枝, 古谷野 潔

    日本補綴歯科学会誌   2019.5

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  • 【インプラント周囲軟組織は現在どこまで解明されているのか?-臨床家が気になる疑問にエビデンスで迫る-】

    熱田 生, 鬼原 英道, 森本 太一朗

    Quintessence DENTAL Implantology   2019.5

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  • ベニジピン含有マイクロスフィア単回投与が抜歯窩の骨および歯肉の治癒におよぼす影響

    今井 実喜生, 鮎川 保則, 安波 礼之, 古橋 明大, 冨田 陽子, 足立 奈織美, 森山 泰子, 熱田 生, 古谷野 潔

    日本補綴歯科学会誌   2019.5

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  • 「噛める」から「食べられる」を目指して―舌圧の重要性を再考する―

    鈴木宏樹, 荻野洋一郎, 熱田 生

    ザ・クインテッセンス 2019年1月号   2019.1

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  • 高脂血症治療薬statinの局所投与による骨増生

    神野 洋平, 鮎川 保則, 荻野 洋一郎, 熱田 生, 古谷野 潔

    日本再生歯科医学会誌   2018.12

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  • 組織再生と細胞・足場・生理活性物質

    鮎川 保則, 熱田 生, 古谷野 潔

    顎顔面補綴   2018.12

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  • インプラント臨床を発展させる日本のバイオマテリアル 間葉系幹細胞によるインプラント周囲軟組織封鎖性の改善

    熱田 生

    Journal of Oral Biosciences Supplement   2018.9

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  • アスピリンを用いたインプラント周囲上皮封鎖性に対する間葉系幹細胞効果の増強

    熱田 生, 鮎川 保則, 近藤 綾介, 松浦 由梨, 古橋 明大, 成松 生枝, 上田 将之, 古谷野 潔

    日本口腔インプラント学会誌   2018.9

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  • Back to the basics ゴシックアーチは本当に必要なのか

    兒玉 直紀, 熱田 生, 松丸 悠一, 松田 謙一

    日本補綴歯科学会誌   2018.1

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    Back to the basics ゴシックアーチは本当に必要なのか
    全部床義歯治療を成功させるうえで咬合採得の占める割合は非常に高く、なかでも水平的顎間関係の決定には客観的な指標が乏しく苦慮していると推察される。ゴシックアーチ描記装置は、下顎の限界運動を記録できる装置であり、水平的顎間関係の決定法の一つとして長い間用いられてきた。しかし、近年その利用数は減少しているように思われる。さらに米国の教科書ではゴシックアーチ描記法(以下、GoAとする)の記載がなくなり、徐々に教育されなくなっている。本論文では、1)GoAの有用性とその意義、2)GoAの問題点と注意点、3)咬合採得のゴールをどこに定めるか、について解説し、全部床義歯治療におけるGoAの必要性について改めて検討したい。(著者抄録)

  • インプラント周囲組織における生物学的幅径および軟組織封鎖性の検討

    成松 生枝, 鮎川 保則, 熱田 生, 大城 和可奈, 安波 礼之, 古橋 明大, 古谷野 潔

    日本補綴歯科学会誌   2017.6

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  • 【若手補綴医に訊く 総義歯印象が上手くなる~知識と臨床のポイント】総義歯における概形印象の重要性

    熱田 生

    歯界展望   2016.12

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  • PLGA-フルバスタチン複合体局所単回投与による抜歯窩及びインプラント周囲組織治癒促進効果の検討

    安波 礼之, 鮎川 保則, 古橋 明大, 熱田 生, 古谷野 潔

    日本口腔インプラント学会誌   2015.8

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  • Anodized surface and its clinical performance

    Kiyoshi Koyano, Ikiru Atsuta, Yohei Jinno

    Implant Surfaces and their Biological and Clinical Impact   2015.1

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    Many implant surfaces and surface-modification techniques have been examined, and anodized surface on dental implant has been in continued clinical use and has demonstrated good stability during the healing phase. This proof has provided the basis for treatment modality of immediate function. In this chapter, the evidences based on the clinical and basic study reporting the success of osseointegrated implants regarding anodized surface will be reviewed. An understanding of the current evidence may facilitate the most appropriate utilization of this important dental resource.

    DOI: 10.1007/978-3-662-45379-7_10

  • 病態の異なるhost‐MSCの相互作用について~BRONJモデルマウスを用いて~

    松浦由梨, 熱田生, 鮎川保則, 高橋良, 近藤綾介, 古谷野潔

    日本再生歯科医学会学術大会および総会プログラム・抄録集   2014.12

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    病態の異なるhost‐MSCの相互作用について~BRONJモデルマウスを用いて~

  • 間葉系幹細胞の直接的/間接的な組織再生への関与を考える 間葉系幹細胞誘導性インプラント周囲粘膜の構築

    熱田 生, 鮎川 保則, 山座 孝義, 近藤 綾介, 松浦 由梨, 古谷野 潔

    Journal of Oral Biosciences Supplement   2014.9

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  • チタンに対する上皮封鎖性向上法の探求―塩化カルシウム水熱処理の効果―

    大城和可奈, 鮎川保則, 熱田生, 古橋明大, 古谷野潔

    日本口腔インプラント学会誌   2014.8

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    チタンに対する上皮封鎖性向上法の探求―塩化カルシウム水熱処理の効果―

  • 質の高い全部床義歯の印象を目指して 印象法の考察と重要なポイント

    熱田 生, 佐藤 佑介, 松丸 悠一

    日本補綴歯科学会誌   2014.5

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  • 生体内分解性高分子化合物を用いた骨組織再生用新規マテリアルの開発

    清水秀夫, 神野洋平, 鮎川保則, 熱田生, 古谷野潔

    日本口腔インプラント学会誌   2013.9

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    生体内分解性高分子化合物を用いた骨組織再生用新規マテリアルの開発

  • インプラント―生体界面の統合的理解と持続性ある界面獲得のストラテジー

    鮎川保則, 熱田生, 古谷野潔

    日本歯科医学会誌   2013.3

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    インプラント―生体界面の統合的理解と持続性ある界面獲得のストラテジー

  • 二価カチオン処理チタンに対する口腔上皮様細胞および線維芽細胞接着性の検討

    鮎川保則, 大川内秀幸, 古橋明大, 熱田生, 古谷野潔

    日本口腔インプラント学会誌   2012.9

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    二価カチオン処理チタンに対する口腔上皮様細胞および線維芽細胞接着性の検討

  • アバットメント材料の違いはソフトティッシュインテグレーションに影響するか?

    古橋明大, 鮎川保則, 熱田生, 安波礼之, 古谷野潔

    日本口腔インプラント学会誌   2012.9

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    アバットメント材料の違いはソフトティッシュインテグレーションに影響するか?

  • インシュリン様成長因子‐Iを用いたインプラント周囲における上皮封鎖性の向上

    熱田生, 鮎川保則, 古橋明大, 古谷野潔

    日本口腔インプラント学会誌   2012.9

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    インシュリン様成長因子‐Iを用いたインプラント周囲における上皮封鎖性の向上

  • インプラント表面性状の違いがラット口腔粘膜上皮に与える影響

    熱田生, 鮎川保則, 古橋明大, 荻野洋一郎, 森山泰子, 築山能大, 古谷野潔

    日本補綴歯科学会学術大会プログラム・抄録集   2012.5

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    インプラント表面性状の違いがラット口腔粘膜上皮に与える影響

  • チタンインプラントに対する口腔粘膜上皮細胞接着 : PI3-kinase の役割について

    熱田 生, 鮎川 保則, 荻野 洋一郎, 森山 泰子, 神野 洋平, 古谷野 潔

    日本補綴歯科学会誌. 特別号, 社団法人日本補綴歯科学会学術大会プログラム・抄録集 = Program and abstracts, the ... scientific meeting of Japan Prosthodontic Society   2010.8

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    The Adhesion of Oral Epithelial Cells to the Titanium Implant : The Role of Phosphatidylinositol 3-Kinase

  • Simvastatin enhances bone formation around titanium implants in rat tibiae

    Y. Ayukawa, Y. Ogino, Y. Moriyama, I. Atsuta, Y. Jinno, M. Kihara, Y. Tsukiyama, K. Koyano

    JOURNAL OF ORAL REHABILITATION   2010.2

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    Statins are cholesterol-lowering drugs that have been reported to promote bone formation. The purpose of this study was to investigate the effect of simvastatin on the enhancement of bone formation around titanium implants. Thirty-week-old female rats received pure titanium implants in both tibiae. The animals were intra-peritoneally administered 0, 0.125, 1, 5 or 10 mg kg(-1) of simvastatin daily. After 30 days, the animals were sacrificed, and specimens were prepared. The bone contact ratio of the implant, bone density in the medullary canal and percentage of cortical bone were obtained. Markers for bone turnover were also measured using sera collected at the time of euthanasia. In the medullary canal, a scanty amount of bone was observed in the 0, 0 125 and 1 mg kg(-1) groups. In contrast, in both the 5 and 10 mg kg(-1) groups, thicker bone trabeculae were abundant. Histometric observations showed that the bone contact ratio and the bone density of both groups were significantly greater than those of the other groups ( ANOVA, P < 0.01). However, no significant difference in the percentage of cortical bone was found between groups. Serum chemistry showed that statin increased bone formation markers and decreased bone resorption markers. In conclusion, although the dose equivalent to that used in human patients with hypercholesterolemia was not effective, a simvastatin dose of 5 mg kg(-1) or higher increased medullary bone formation around the titanium. In contrast, no effect of simvastatin on pre-existing cortical bone was indicated.

    DOI: 10.1111/j.1365-2842.2009.02011.x

  • 長期徐放性キャリアを用いたフルバスタチン遠隔単回投与がインプラント周囲骨に与える影響

    益崎 与泰, 鮎川 保則, 森山 泰子, 神野 洋平, 熱田 生, 築山 能大, 古谷野 潔

    日本口腔インプラント学会誌   2009.8

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  • Platelet-rich plasma suppresses osteoclastogenesis by promoting the secretion of osteoprotegerin

    Y. Ogino, Y. Ayukawa, T. Kukita, I. Atsuta, K. Koyano

    JOURNAL OF PERIODONTAL RESEARCH   2009.4

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    Platelet-rich plasma is characterized by containing fundamental protein growth factors. Although many in vitro studies have documented the capability of platelet-rich plasma to induce the growth of osteoblasts or osteoblast-like cells, the effect of platelet-rich plasma on osteoclastogenesis has not yet been studied. The aim of the present study was to evaluate the effects of platelet-rich plasma and platelet-poor plasma on osteoclastogenesis with rat bone marrow cell culture.
    Platelet-rich plasma and platelet-poor plasma were produced from the whole blood of rat. For cell culture, rat bone marrow cells were isolated from rat tibiae and then treated with 1,25 alpha dihydroxy vitamin D(3) and with different concentrations of platelet-rich plasma or platelet-poor plasma. After 4 d of culture, rat bone marrow cells were stained with tartrate-resistant acid phosphatase (TRAP), and TRAP-positive cells that had more than three nuclei (TRAP-positive multinucleated cells) were counted as osteoclast-like cells. Osteoprotegerin, known as an osteoclastogenesis-related factor, cells was quantified using an enzyme-linked immunosorbent assay (ELISA).
    Although platelet-poor plasma had no effect on the formation of TRAP-positive multinucleated cells, platelet-rich plasma decreased the number of TRAP-positive multinucleated cells in a dose-dependent manner. The amount of osteoprotegerin produced from rat bone marrow cells and from MC3T3-E1 cells was enhanced in platelet-rich plasma-treated groups.
    Under our experimental conditions, platelet-rich plasma decreased the formation of TRAP-positive multinucleated cells and increased the secretion of osteoprotegerin. This study suggests that platelet-rich plasma suppresses osteoclastogenesis, therefore inhibiting bone resorption. In addition we also demonstrated that platelet-rich plasma increased the secretion of osteoprotegerin, an inhibitor for osteoclast formation, thus suggesting that the enhancement of osteoprotegerin secretion induces this inhibitory effect.

    DOI: 10.1111/j.1600-0765.2008.01109.x

  • 高脂血症治療薬statinの局所投与による骨増生

    神野 洋平, 鮎川 保則, 荻野 洋一郎, 熱田 生, 古谷野 潔

    日本再生歯科医学会誌   2008.12

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  • Comparative Studies of the Peri-implant Epithelium of Rat Gingivae between "Step-type" and "Straight-type" Implant System

    ATSUTA I, AYUKAWA Y, OGINO Y, MORIYAMA Y, JINNO Y, KOYANO K

    日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society   2008.6

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    Comparative Studies of the Peri-implant Epithelium of Rat Gingivae between "Step-type" and "Straight-type" Implant System

  • Responses of Osteoclast Progenitors to Bone Morphogenetic Protein-2 in the Different Culture Systems

    OGINO Yoichiro, AYUKAWA Yasunori, ATSUTA Ikiru, KOYANO Kiyoshi

    日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society   2007.5

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    Responses of Osteoclast Progenitors to Bone Morphogenetic Protein-2 in the Different Culture Systems

  • Comparative Studies of the Peri-implant Epithelium of Rat Gingivae between "Platform-switched" and "Non-switched" Implant System

    ATSUTA Ikiru, AYUKAWA Yasunori, OGINO Yoichiro, KOYANO Kiyoshi

    日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society   2007.5

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    Comparative Studies of the Peri-implant Epithelium of Rat Gingivae between "Platform-switched" and "Non-switched" Implant System

  • スタチン含β-TCPの骨補填材としての応用 ラットを用いた組織学的研究

    安川 英輔, 鮎川 保則, 荻野 洋一郎, 熱田 生, 神野 洋平, 森山 泰子, 古谷野 潔

    日本口腔インプラント学会誌   2007.3

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  • 高脂血症治療薬 statin の局所投与が骨形成に及ぼすメカニズム

    安川 英輔, 鮎川 保則, 和田 裕子, 熱田 生, 古谷野 潔

    日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society   2006.7

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    The Mechanism of the Local Application of Statins on the Bone Healing

  • インプラント表面への口腔上皮細胞の接着に対するIGF-Iの効果

    熱田 生, 鮎川 保則, 荻野 洋一郎, 安川 英輔, 古谷野 潔

    日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society   2006.7

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    Effect of IGF-I on Adhesion of Oral Epithelial Cells to Implant Surface

  • Statin 局所投与がインプラント周囲骨形成に及ぼす効果

    森山 泰子, 鮎川 保則, 荻野 洋一郎, 熱田 生, 古谷野 潔

    日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society   2006.7

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    Topical Application of Fluvastatin Affects the Bone Healing around Implants

  • Ultrastructural localization of laminin-5 (gamma 2 chain) in the rat peri-implant oral mucosa around a titanium-dental implant by immuno-electron microscopy

    Atsuta, I, T Yamaza, M Yoshinari, T Goto, MA Kido, T Kagiya, S Mino, M Shimono, T Tanaka

    BIOMATERIALS   2005.11

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    Laminin-5 (Ln-5) is an important molecule associated with epithelial cell adhesion and migration. In the gingiva around the tooth. Ln-5 localizes within basement membranes between the junctional epithelium (JE), and the tooth or connective tissue. Recently, we reported that in the oral mucosa around a dental implant, Ln-5 is expressed within the basement membranes at the implant-peri-implant epithelium (PIE) interface, and at the PIE-connective tissue interface. However, the ultrastructural localization of Ln-5 within or along the PIE has not yet been reported. Therefore, peri-implant oral mucosa was treated with anti-Ln-5 ((7)2 chain) antibody and examined using immuno-electron microscopy. Ln-5 was localized in the cells of the innermost-third layer and basal layer of the PIE. A 100-nm-wide Ln-5-positive internal basal lamina (basement membrane) and hemidesmosomes as adhesion structures were formed at the apical portion of the implant-PIE interface. However, at the upper-middle portion of the interface, these adhesion structures were not observed. Furthermore. at the PIE connective tissue interface. the Ln-5-positive external basal lamina (basement membrane) and hemidesmosomes were partially deficient. Judging from these findings. we concluded that Ln-5 contributes to the attachment of the PIE to the titanium surface, and that PIE attached to titanium at the apical portion of the dental implant-PIE interfaced (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biomaterials.2005.03.046

  • Changes in the distribution of laminin-5 during peri-implant epithelium formation after immediate titanium implantation in rats

    Atsuta, I, T Yamaza, M Yoshinari, S Mino, T Goto, MA Kido, Y Terada, T Tanaka

    BIOMATERIALS   2005.5

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    Laminin-5 (Ln-5), a component of the basement membrane (BM), regulates epithetial cell migration and adhesion. This study used anti-Ln-5 (gamma2chain) antibody to investigate the distribution of Ln-5 during the formation of peri-implant epithelium (PIE) in rats, and compared it to the distribution of Ln-5 during oral mucosa formation after tooth extraction. One day after extraction. the junctional epithelium (JE) had disappeared. After 3 days, new epithelium formed from the oral sulcular epithelium (OSE) and extended horizontally over the wound with Ln-5-positive cells at the leading edge. After 5 days, the epithelium exiending from the OSE on each side of the wound joined and formed additional new epithelium. The new epithelium expressed Ln-5 in the BM - After 1-2 weeks, the oral epithelium (OE) extending from the sides of the wound joined in the center. Thereafter. OSE and new epithelium disappeared, and only OE remained covering the wound. Three days after implantation (titanium), no JE remained. New epithehium formed from the keratinized OSE extending apically with Ln-5-positive cells. After 1-2 weeks. the new epithelium became the PIE and spread further apically facing the implant surface. Ln-5 was expressed at the PIE-connective tissue interface. but no( at the implant-PIE interface. Finally, after 4 weeks, Ln-5 was expressed at the implant-PIE interface. and the PIE was non-keratinized epithelium. These findings suggest that Ln-5 induces cell migration clurinq PIE formation. and that PIE originates from OSE. Furthermore, they support the hypothesis that Ln-5 contributes to the attachment of PIE 10 titanium. regardless of the delay in the synthesis and deposition of Ln-5 at the titanium-PIE interface. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biomaterials.2004.05.033

  • The bisphosphonate pamidronate on the surface of titanium stimulates bone formation around tibial implants in rats

    H Kajiwara, T Yamaza, M Yoshinari, T Goto, S Iyama, Atsuta, I, MA Kido, T Tanaka

    BIOMATERIALS   2005.2

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    Many materials with differing surfaces have been developed for clinical implant therapy in dentistry and orthopedics. We analyzed the quantity of new bone formed in vivo around caleium-immobilized titanium implants with surfaces modified using pamidronate (PAM), a nitrogen-containing bisphosphonate (N-BP), implants of pure titanium, and titanium implants immobilized with calcium ions. New bone formation was visualized using fluorescent labeling (calcein blue and alizarin complexone) with intravenous injection at 1 and 3 weeks after implantation. After 4 weeks, undecalcified sections were prepared, and new bone formation around the implants was examined by morphometry using confocal laser scanning microscopy images. After 1 week, more new bone formed around the PAM-immobilized implant than around the calcium-immobilized and pure titanium implants. This was also seen with the new bone formation after 3 weeks. After 4 weeks, significantly more new bones were formed around the BP-immobilized implant than around the calcium ion-implanted and pure titanium implants. The new N-BP-modified titanium surface stimulates new bone formation around the implant, which might contribute to the success of implant therapy. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biomaterials.2004.02.072

  • 破骨細胞におけるIba1の局在

    山座 孝義, 鍵谷 忠慶, 熱田 生, 城戸 瑞穂, 田中 輝男

    Journal of oral biosciences   2004.9

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  • チタンへの口腔粘膜上皮細胞の接着に対するインスリン様増殖因子-1(IGF-1)の効果

    熱田 生, 山座 孝義, 吉成 正雄, 城戸 瑞穂, 寺田 善博, 田中 輝男

    Journal of oral biosciences   2004.9

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  • Oxidative Stress-induced DNA Damage in the Synovial Cells of the Temporomandibular Joint in the Rat

    YAMAZA T., MASUDA K. F., ATSUTA I., NISHIJIMA K., KIDO M. A., TANAKA T.

    Journal of dental research   2004.8

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    Oxidative Stress-induced DNA Damage in the Synovial Cells of the Temporomandibular Joint in the Rat

  • 破骨細胞の膜輸送過程におけるPI3キナーゼの関与について

    山座 孝義, 熱田 生, 鍵谷 忠慶, 室谷 春江, 城戸 瑞穂, 後藤 哲哉, 田中 輝男

    歯科基礎医学会雑誌   2003.9

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  • ラットの口蓋及び舌におけるカプサイシン受容体の発現について

    室谷 春江, 城戸 瑞穗, 山座 孝義, 熱田 生, 寺田 善博, 田中 輝男

    歯科基礎医学会雑誌   2003.9

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  • Phosphatidylinositol-3 kinase plays a role in vesicle transport in the secretory pathway of cathepsin K and cystatin C in osteoclasts

    T Yamaza, Atsuta, I, Y Tsuji, T Goto, T Tanaka

    BONE   2003.5

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  • 破骨細胞におけるカテプシンKおよびシスタチンCの遺伝子ならびに動態

    山座 孝義, 辻 康夫, 熱田 生, 室谷 春江, 後藤 哲哉, 田中 輝男

    歯科基礎医学会雑誌   2002.9

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  • インプラント体周囲粘膜上皮の形成過程におけるラミニン5の発現

    熱田 生, 山座 孝義, 吉成 正雄, 白岩 昌, 室谷 春江, 城戸 瑞穂, 寺田 善博, 田中 輝男

    歯科基礎医学会雑誌   2002.9

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  • ラットの口蓋及び舌におけるカプサイシン受容体の発現について

    室谷 春江, 城戸 瑞穂, 山座 孝義, 熱田 生, 寺田 善博, 田中 輝男

    歯科基礎医学会雑誌   2002.9

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Professional Memberships

  • 日本口腔インプラント学会

  • バイオマテリアル学会

  • 日本補綴歯科学会

  • 日本歯周病学会

  • International and American Association for Dental Research

  • The Japanese Society for Dental Materials and Devices

  • 日本老年歯科医学会

  • 日本補綴歯科学会

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  • 日本老年歯科医学会

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  • 日本歯周病学会

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  • 日本口腔インプラント学会

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  • International and American Association for Dental Research

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  • バイオマテリアル学会

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Committee Memberships

  • 日本補綴歯科学会   特命 副委員長  

    2023.7   

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  • 日本口腔インプラント学会   教育研修委員会  

    2022.6   

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  • 日本補綴歯科学会   補綴学会誌 編集委員会  

    2020.6   

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  • 日本補綴歯科学会   理事長幹事  

    2012.4   

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Research Projects

  • 骨補填材が硬・軟組織治癒に及ぼす影響と間葉系幹細胞に着目したメカニズムの解明

    Grant number:24K13008  2024.4 - 2028.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    成松 生枝, 熱田 生, 鮎川 保則

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    Grant type:Scientific research funding

    骨欠損部には骨補填材が移植されるが、侵襲性や供給量の問題から人工骨も多く選択される。しかし、骨補填材の軟組織への影響は不明であり、治癒に与えるメカニズムは未知なところも多い。
    本研究では創傷治癒の観点より、骨補填材の骨置換および軟組織の反応を評価する。また、これらがなぜ生じるのか間葉系幹細胞(MSC)の役割に着目して検討する。
    本研究結果は人工骨を使用する上でリスクとなる感染を回避し、硬・軟組織から治癒の予測とコントロールを可能にすると考える。

    CiNii Research

  • Novel Treatment for Medication-Related Osteonecrosis of the Jaw with Mucosal Closure Deficiency Using Stem Cell-Derived Mitochondria

    Grant number:24K02634  2024.4 - 2028.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    熱田 生, 神野 洋平, 上田 将之, 鮎川 保則, 古橋 明大

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    本研究では3つの「問い」を解明する。すなわち、1)MRONJの病態の一つである口腔粘膜の閉鎖不全は上皮細胞のミトコンドリアの異常によるものか?2)MSCによる不良ミトコンドリアの交換がOECの局所的な異常性も改善し、MRONJの治療に寄与できるか? 3)細胞投与ではなく、ミトコンドリアを直接治療に生かすことができるか?である。

    CiNii Research

  • 薬剤関連顎骨壊死の粘膜閉鎖不全に対する幹細胞由来ミトコンドリアを用いた新規治療法

    2024 - 2027

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • Conceptualization of mesenchymal stem cell-related diseases and elucidation of their etiology and treatment modality

    Grant number:23K27782  2023.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    鮎川 保則, 熱田 生, 高橋 良

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    間葉系幹細胞(MSC)は種々の疾患の治療能力を有していることが明らかになりつつある.一方で,一部の疾患において「MSCの劣化」が症状増悪の一端を担っていると仮定しうる状況も見られるようになってきた.本研究ではこれを「間葉系幹細胞関連疾患」と定義し,疾患治療のターゲットを「劣化MSCの治療」に置くという視点を提示したい.そのために,まずMSCの疾患治療能力の謎を解明し,劣化MSCの機能改善・向上を通して新規治療法や創薬に結びつけることを目標とする.

    CiNii Research

  • Therapeutic interactions between mesenchymal stem cells for healing medication-related osteonecrosis of the jaw via mitochondria

    Grant number:23K21491  2021.4 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    熱田 生, 神野 洋平, 鮎川 保則, 上田 将之, 鬼村 由梨

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    本研究ではMSCのミトコンドリアに注目し、細胞自体ではなく細胞小器官であるミトコンドリアを対象とした治療の可能性を示すことが目的である。ミトコンドリアに注目してMSCによる疾患の制御を解明すること自体が、学術的独自性や創造性が高いと思われる。また本件研究によって得られた結果は、MRONJに留まらず種々の疾患の新たな治療法として提案できる可能性がある。

    CiNii Research

  • 間葉系幹細胞の不良ミトコンドリアを標的とした薬剤関連顎骨壊死の新規治療法の構築

    Grant number:21H03133  2021 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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  • 間葉系幹細胞の不良ミトコンドリアを標的とした薬剤関連顎骨壊死の新規治療法の構築

    Grant number:21H03133  2021 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 再生医療へ向けた新規3次元的細胞制御への試み

    Grant number:20K10055  2020 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 間葉系幹細胞由来エクソソームの解析と治療効果の検討

    Grant number:20H03879  2020 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • インプラント治療とMesenchymal stem cell aging

    Grant number:19H03843  2019 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 薬剤関連顎骨壊死の治療と予防を目指した間葉系幹細胞の新規投与法

    Grant number:18K09662  2018 - 2020

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 薬剤関連顎骨壊死の治療と予防を目指した間葉系幹細胞の新規投与法

    Grant number:18K09662  2018 - 2020

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 新規三次元培養技術の再生医療への応用

    Grant number:17K11756  2017 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • インプラントの早期機能、長期的維持を可能にする新規表面処理法の開発

    Grant number:16K20506  2016 - 2018

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • ブリッジポンティックと口腔粘膜との界面に上皮付着は存在するか? International coauthorship

    2015.10

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    Authorship:Principal investigator 

  • デンタルインターフェイスにおける応力-セルシグナル変換の解明と個体差医療への展開

    Grant number:15H02573  2015 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 未分化間葉系幹細胞を用いた力を起因とする歯科疾患の超早期自律診断と予防治療の開発

    Grant number:15H05029  2015 - 2018

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 歯肉由来間葉系幹細胞が有する疾患治療能のアスピリンによる増強

    Grant number:15K15710  2015 - 2016

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • インプラントの細胞骨格制御能に注目したオッセオインテグレーションへのアプローチ

    Grant number:26462924  2014 - 2016

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 表面改質によるプラークフリーインプラントアバットメントの開発

    Grant number:26462926  2014 - 2016

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • チタンをニッチとしたヒト歯肉由来間葉系幹細胞によるインプラント周囲組織の再生治療

    2014 - 2015

    Grants-in-Aid for Scientific Research  Grant-in-Aid for challenging Exploratory Research

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • チタンをニッチとしたヒト歯肉由来間葉系幹細胞によるインプラント周囲組織の再生治療

    Grant number:26670839  2014 - 2015

    Grants-in-Aid for Scientific Research  Grant-in-Aid for challenging Exploratory Research

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • チタンをニッチとしたヒト歯肉由来間葉系幹細胞によるインプラント周囲組織の再生治療

    Grant number:26670839  2014 - 2015

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 間葉系幹細胞を用いたインプラント周囲炎の治療

    2013.8

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    Authorship:Principal investigator 

  • チタン親和性を有する間葉系幹細胞の開発と歯科インプラント治療への応用

    Grant number:25670833  2013 - 2014

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 自己細胞侵入型新規骨補填材の開発―海綿骨を模倣する―

    Grant number:25463005  2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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  • インプラント界面成立機構の解明と機能的界面の維持に関する研究

    Grant number:24249089  2012 - 2014

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • チタンをニッチとした間葉系幹細胞による新規インプラント治療

    Grant number:23592888  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • チタンをニッチとした間葉系幹細胞による新規インプラント治療.

    2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • ビスホスホネート投与患者における骨および上皮治癒不全の原因

    2009.4

  • インプラント周囲における上皮封鎖性の向上

    2009.4

  • 間葉系幹細胞を用いた癌治療

    2009.4

  • チタン・生体双方へのアプローチによるインターフェースの構築・維持に関する研究

    Grant number:21390520  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 審美的・機能的なインプラント治療を目指した真の付着上皮再生

    2008 - 2010

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

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    Grant type:Scientific research funding

  • 戦略的補綴治療としての補綴前骨増生を手術なしで行う手法の開発とその原理の検討

    Grant number:20390490  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 審美的・機能的なインプラント治療を目指した真の付着上皮再生

    Grant number:20791432  2008 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • インプラント周囲骨吸収に対する負担荷重の関与の解明-特に感染との関連について-

    Grant number:20659301  2008 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • ティッシュエンジニアリングを応用した審美的・機能的インプラント周囲組織の構築

    Grant number:18791444  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant type:Scientific research funding

  • 口腔組織の再生・再建医療研究プロジェクト

    2005.12

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    Authorship:Principal investigator 

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Educational Activities

  • REGENERATION STUDY OF PERI-IMPLANT

Class subject

  • 部分床義歯補綴学

    2018.10 - 2019.3   Second semester

  • 全部床義歯学

    2018.4 - 2018.9   First semester

  • 臨床予備実習

    2015.4 - 2016.3   Full year

  • 基礎実習

    2013.4 - 2014.3   Full year

  • 生物科学Ⅲ

    2013.4 - 2013.9   First semester

  • 口腔機能修復学研究入門

    2009.4 - 2010.3   Full year

  • 臨床基礎演習

    2009.4 - 2010.3   Full year

  • 口腔機能修復学特論

    2009.4 - 2010.3   Full year

  • クラウンブリッジ補綴学(高年次) D

    2024.12 - 2025.2   Winter quarter

  • クラウンブリッジ補綴学(低年次) D

    2024.12 - 2025.2   Winter quarter

  • クラウンブリッジ補綴学(コア) D

    2024.12 - 2025.2   Winter quarter

  • Fixed Prosthodontics (Lower-grade) D

    2024.12 - 2025.2   Winter quarter

  • クラウンブリッジ補綴学(高年次) C

    2024.10 - 2024.12   Fall quarter

  • クラウンブリッジ補綴学(低年次) C

    2024.10 - 2024.12   Fall quarter

  • クラウンブリッジ補綴学(コア) C

    2024.10 - 2024.12   Fall quarter

  • Fixed Prosthodontics (Lower-grade) C

    2024.10 - 2024.12   Fall quarter

  • クラウンブリッジ補綴学臨床実習Ⅳ

    2024.4 - 2025.3   Full year

  • クラウンブリッジ補綴学臨床実習Ⅲ

    2024.4 - 2025.3   Full year

  • クラウンブリッジ補綴学臨床実習Ⅱ

    2024.4 - 2025.3   Full year

  • クラウンブリッジ補綴学臨床実習Ⅰ

    2024.4 - 2025.3   Full year

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Other educational activity and Special note

  • 2015  Special Affairs  イボクラ社の推奨するシステムとしてBPSを導入し、全部床義歯教育において貢献した

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    イボクラ社の推奨するシステムとしてBPSを導入し、全部床義歯教育において貢献した

  • 2013  Special Affairs  全学教育に携わり、歯科分野以外の学生教育にも貢献出来るよう努める

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    全学教育に携わり、歯科分野以外の学生教育にも貢献出来るよう努める

  • 2009  Special Affairs  大学教育の一環として行われている学部生による研究の技術的指導を行い、学内発表のサポートを行った。

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    大学教育の一環として行われている学部生による研究の技術的指導を行い、学内発表のサポートを行った。

Travel Abroad

  • 2010.4 - 2012.3

    Staying countory name 1:United States   Staying institution name 1:USC(南カリフォルニア大学:University of Sothern California) CCMB(Center of Craniofacial Molecular Biology)

Specialized clinical area

  • Biology / Medicine, Dentistry and Pharmacy / Dentistry / Prosthetic Science and Engineering Dentistry

Year of medical license acquisition

  • 2001