Kyushu University Academic Staff Educational and Research Activities Database
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toru kitahara Last modified date:2019.11.06

Lecturer / Division of Oral Health, Growth & Development, Faculty of Dental Science
Oral Health Care
Kyushu University Hospital


Graduate School
Undergraduate School


E-Mail
Homepage
http://www.ortho.dent.kyushu-u.ac.jp/
Homepage of Orthodontics of Faculty of Dental Science, Kyushu University .
Phone
092-642-6462
Fax
092-642-6398
Academic Degree
Ph.D.
Country of degree conferring institution (Overseas)
No
Field of Specialization
Orthodontics
Total Priod of education and research career in the foreign country
00years00months
Outline Activities
The purpose of my first study was to evaluate the feasibility of the mfMRI in masticatory muscles induced muscle fatigue. Muscle functional magnetic resonance imaging (mfMRI) is an innovative technique to evaluate muscle activity and differential recruitment of deep and superficial muscles following exercise.

My second study is PREOPERATIVE AND POSTOPERATIVE ORTHODONTIC TREATMENT. Jaw malrelations results from disportional facial growth. As these disportionals progressively manifest, the teeth attempt to mask the disproportional change. In the case of mandibular prognathism the lower incisors are usually lingually inclined. The maxillary incisors are frequently labially inclined. The amount of anterior dental crossbite is almost always less than the skeletal imbalance. Preoperative orthodontics consisted of removing the dental compensations, flared maxillary incisors, and lingually inclined mandibular incisors characteristic of mandibular Prognathism.
Angle Class III molar relationship with uncompensated incisor axial inclination (yellow line) and compensated incisor axial inclination. If mandibular prognathism, maxillary first premolars are extracted and the maxillary anterior teeth are retracted. The mandibular incisors are aligned by uprighting over basal bone, no teeth were extracted in the lower arch.

The purpose of my third study was to obtain quantitative values for human skull structures in a cross-sectional analysis of offspring and their parents. The offspring were classified according to age into three groups. For each 11 maxillo-facial and 9 dento-alveolar structural angular measurements, the mean and standard deviation were calculated for each set of paternal, maternal, midparent and offspring. The standard deviation unit (SDU) values were calculated from the disparity between the measured value in a given individual, i.e., father, mother, midparent, offspring, and their corresponding group mean value.
There were significant differences between the D.v. in families and those in unrelated control groups. Consistency between the S.r. for maxillo-facial and that for dento-alveolar measurements was found in the older age groups. It is concluded that individual growth of skull morphology might be more predictable using the present method.
Research
Research Interests
  • Molecular imaging of masticatory muscle fatigue by mfMRI and 31P-MRS in temporomandibular disorders.
    keyword : temporomandibular disorders,masticatory muscle fatigue,myofunction MRI,31P-MRS
    2017.04~2020.03.
  • Energy metabolism in human masseter muscle observed by mfMRI and 31P-MRS in jaw deformities
    keyword : Experimental muscle fatigue, Energy metabolism
    2014.07~2017.03.
  • The applications of musculoskeletal molecular imaging are emerging. This study investigated the energy metabolism of the masseter muscles by muscle functional MRI (mfMRI) and 31P-Magnetic Resonance Spectroscopy (MRS) under conditions of experimental muscle fatigue.
    keyword : Experimental muscle fatigue, mfMRI, musculoskeletal molecular imaging, Energy metabolism
    2011.04~2014.03.
  • The Finite Element Analysis of the Orthodontic Miniscrews: the Effect of the Insertion direction and Proximity to Teeth's roots.
    keyword : Orthodontic Miniscrews, Finite Element Analysis
    2011.07~2014.12.
  • Longitudinal study on QOL assessment in orthodontic patients required jaw surgery
    keyword : Jaw deformity, CES-D test, STAI test, SF-36 test, Orthognathic Quality of Life Questionnaire, Psychosocial impact, outocome
    2010.04~2013.03.
  • Three-Dimensional Evaluation of Posed Smile
    keyword : Posed Smile; Three-Dimensional Evaluation; High speed camera
    2008.01~2011.12It aims at the establishment toward the clinical application of the three-dimensional standard motion picture photography system which used a high-speed camera.At present, it proceeds with the analysis about a change in a position of each measure point which moved an image from the front to the center typically. I want to do the form of labia oris analysis in the function by arranging measure point onto the proper sagittal plane of the soft tissue..
  • Evaluation of the Changes in Pharyngeal Airway Space and Hyoid Bone Position after Mandibular Setback Surgery for Skeletal Class III Jaw Deformity in Japanese Female.
    keyword : Pharyngeal airway space (PAS); Hyoid bone; Class III malocclusion; Orthognathic surgery.
    2008.10~2010.12.
  • Reproducibility of portable polysomnography values in malocclusion group
    keyword : Reproducibility; Polysomnography; Apnea.
    2006.10~2008.12.
  • Quantitative evaluation of lip morphological changes in orthodontic treatment: A comparison of Class-II division 1 Malocclusion and Normal occlusion at rest and on smiling.
    keyword : Lip position; Smile; Soft-tissue.
    2006.10~2009.12.
  • Three-dimensional analysis of smile movement using high speed cameras for the subjects with normal occlusions and jaw deformities
    keyword : Smile movement; Jaw deformity; High speed camera
    2004.01~2008.12It aims at the establishment toward the clinical application of the three-dimensional standard motion picture photography system which used a high-speed camera.At present, it proceeds with the analysis about a change in a position of each measure point which moved an image from the front to the center typically. I want to do the form of labia oris analysis in the function by arranging measure point onto the proper sagittal plane of the soft tissue..
  • Three-dimensional changes in head posture induced by nasal blockage
    keyword : Head position, nasal patency, nasal obstruction.
    2005.01~2005.12.
  • Changes of Lip and Tongue Pressures before and afte℡ Surgical Orthodontic Correction and Their Eだect on Postoperative Stability
    keyword : Pressure, tongue pressure, jaw deformity, surgical orthodontic correction, relapse
    2003.01~2003.12It is the plan to measure the mensuration of the patient's labia oris pressure and the cheeks pressure by using the original device before and after the jaw corrective surgery. I will add examination how the change of the anterior tooth axis and the molar tooth axis between preoperative effect the pressure of lip and buccal soft tisuue each othoer. It is resorted with the aim of therapeutic stability after orthognathic surgery and postoperative treatment..
  • Three-dimensional dental cast analyzing system using laser scanning in orthognathic surgery.
    keyword : Laser scanner; 3D dental image; Orthognathic surgery
    2001.01~2003.12.
  • Quantitative evaluation of correlation of skull morphology in families in an attempt to predict growth change.
    keyword : Quantitative evaluation, Familial resemblance, Individual growth prediction
    1996.01~2001.03There is great interest regarding the influence in families of hereditary factors on the morphology of the skull and maxillo-facial and dento-alveolar structures. Therefore, the authors attempted to elucidate the contribution of genetic factors to these morphologies at various ages by comparing quantitative values for human skull morphology in offspring with those in both parents. We then attempted to examine a method of individual growth prediction from a clinical standpoint..
Current and Past Project
  • Muscle functional magnetic resonance imaging (mfMRI) is an innovative technique to evaluate muscle activity and differential recruitment of deep and superficial muscles following exercise.
  • The Finite Element Analysis of the Orthodontic Miniscrews: the Effect of the Insertion direction and Proximity to Teeth's roots.
  • Muscle functional magnetic resonance imaging (mfMRI) is an innovative technique to evaluate muscle activity and differential recruitment of deep and superficial muscles following exercise.
Academic Activities
Reports
1. Promotion of image data on filmless cephalometric prediction for conference and research.
Papers
1. Mhd Hassan Albogha, Toru Kitahara, 東藤 貢, Hiroto Hyakutake, Ichiro Takahashi, Maximum principal strain as a criterion for prediction of orthodontic mini-implants failure in subject-specific finite element models. , Angle Orthodontist, 86, 1, 24-31, 2016.01, [URL], Objective: To investigate the most reliable stress or strain parameters in subject-specific finite element (FE) models to predict success or failure of orthodontic mini-implants (OMIs).
Materials and Methods: Subject-specific FE analysis was applied to 28 OMIs used for anchorage. Each model was developed using two computed tomography data sets, the first taken before OMI placement and the second taken immediately after placement. Of the 28 OMIs, 6 failed during the first 5 months, and 22 were successful. The bone compartment was divided into four zones in the FE models, and peak stress and strain parameters were calculated for each. Logistic regression of the failure (vs success) of OMIs on the stress and strain parameters in the models was conducted to verify the ability of these parameters to predict OMI failure.
Results: Failure was significantly dependent on principal strain parameters rather than stress parameters. Peak maximum principal strain in the bone 0.5 to 1 mm from the OMI surface was the best predictor of failure (R2 5 0.8151).
Conclusions: We propose the use of the maximum principal strain as a criterion for predicting OMI failure in FE models..
2. Tomomi Nakamichi, Toru Kitahara, Ichiro Takahashi, Hiroto Hyakutake, Yoko Iwase, Three-dimensional dynamic evaluation of a posed smile in normal occlusion and Class II malocclusion, http://dx.doi.org/10.1016/j.odw.2013.05.005, 72, 4, 131-141, 2013.06, [URL], Purpose: The purpose of this study was to quantify the three-dimensional movements of the lips during a posed smile and to verify the differences in the dynamic characteristics among normal occlusion and Class II malocclusion. Materials and methods: The subjects included 30 healthy female volunteers with normal occlusion, 23 healthy female volunteers with dentoalveolar Class II malocclusion, and 20 adult female patients with skeletal Class II malocclusion. The three-dimensional measurements of the lips durduring a posed smile were generated using video-based tracking with three high-speed cameras. Eight landmarks on the lips were used to track lip movement. The Scheffe´ method of multiple comparisons was used to identify significant differences among the normal occlusion and both Class II groups. Results: The lower lip point moved significantly faster and farther backward in the skeletal Class II group compared with the other groups. The upper quarter point in the skeletal Class II group in the posed smile was significantly more medial than in the other groups. The vertical movements of the cheilion point of the normal occlusion group were faster than those in the other groups. Conclusion: Three-dimensional dynamic evaluation of posed smiles showed significant differences in the characteristics of lip movement between the normal occlusion and Class II subjects..
3. mariko yoshihara, toru kitahara, Three-dimensional analysis of the pharyngeal airway morphology in growing Japanese girls with and without cleft lip and palate., American journal of orthodontics and dentofacial orthopedics, 10.1016/j.ajodo.2011.09.011, 141, 4 Suppl, 92-101, 2012.04, We evaluated the 3-dimensional craniofacial skeletal and pharyngeal airway morphology in growing patients with and without cleft lip and palate..
4. Kitahara T., Hoshino Y., Maruyama K., In E., Takahashi I., Changes in the pharyngeal airway space and hyoid bone position after mandibular setback surgery for skeletal Class III jaw deformity in Japanese women., American Journal of Orthodontics and Dentofacial Orthopedics, 138, 6, 708.e1-708.e10, 2010.12.
5. Kitahara T., Islam R., Nakata S., Quantitative evaluation of lip morphology at rest and on smiling in orthognathic patients with hyperdivergent retrognathism, Orthodontic Waves, 69, 2, 50-57, 2010.07.
6. Islam R., Kitahara T., Naher L., Hara A., Nakata S., Lip Morphology Changes Following Orthognathic Surgery for Class III Malocclusion, Angle Orthod, 10.2319/031209-143.1, 80, 2, 344-353, 2010.07.
7. Kitahara T., Nakasima A., Kurahara S., Shiratsuchi Y., Hard and Soft Tissue Stability of Orthognathic Surgery Sagittal Split Ramus Osteotomy (SSRO) and Intraoral Vertical Ramus Osteotomy (IVRO), Angle Orthod, 79(1), 158-165, 2009.01.
8. Islam R., Kitahara T., Naher L., Hara A., Nakasima A., Lip Morphological Changes in Orthodontic Treatment, Angle Orthod, 79(2), 256-264, 2009.03.
9. Three-dimensional analysis of smile movement using high speed cameras for the subjects with normal occlusions and jaw deformity.
10. Orthodontic treatment of a sketal asymmetry case with lateral inclination of the occlusal plane.
11. A Skeletal Open bite case Treated by Mandibular Body Ostectomy combined with Glossectomy.
12. Morphological changes upon sagittal split ramus osteotomy for skeletal Class III cases -In relation to a morphology of mandibular symphysis-.
13. Asymmetry of facial soft tissue in TMD patients.
14. Kitahara T., Ichinose M., Nakasima A., Quantitative evaluation of correlation of skull morphology in families in an attempt to predict growth change., European Journal of Orthodontics, 10.1093/ejo/18.2.181, 18, 2, 181-191, 18(2), 181-191, 1996.01.
Presentations
1. Molecular imaging in masseter muscle observed by muscle function magnetic resonance imaging and 31P-magnetic resonance spectroscopy in jaw deformity patients.
2. Molecular imaging of masticatory muscle fatigue with skeletal class III patients by mfMRI and 31P-MRS.
3. Molecular imaging of masticatory muscle fatigue with skeletal class III patients by mfMRI and 31P-MRS.
4. Molecular Imaging of Masseter Muscle Fatigue Using Muscle Functional MRI and 31P-MRS.
5. Energy metabolism in human masseter muscle observed by mfMRI and 31P-MRS.
6. The Finite Element Analysis of the Orthodontic Miniscrews: The Effect of the Insertion Direction and Proximity to Tooth Root.
7. Morphological changes of the pharyngeal airway after mandibular setback by intra-oral vertical ramus osteotomy.
8. Lip Morphological Changes in Orthognathic Treatment.
9. Smile-Analysis of Normal Occlusion by the three-dimensional measurement system using the high speed cameras.
10. Comparison of morphological changes of hard and soft tissue between the treatment by sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO).
11. Precision of active rhinomanometry and respiration resistance for relationship between respiration and maxillofacial morphology
.
12. Three dimensional analysis of gum chewing movement using 3 high-speed video cameras.
13. Gum-chewing-analysis of the patient with facial asymmetry using three-dimensional measurement by the high speed cameras.
14. Smile-analysis of the patient with mandibular prognathism using three-dimensional measurement by the high speed cameras.
Membership in Academic Society
  • Japanese Orthodontic Society.
  • American Association of Orthodontics
  • Japanese Jaw Deformity Society
  • Kyushu Orthodontic Society
Awards
  • Molecular imaging of masticatory muscle fatigue with skeletal class III patients by mfMRI and 31P-MRS.
  • Three factors play significant role in the stability of orthodontic mini-implants
  • Nakamichi T, Kitahara T, Iwase Y, Hyakutake H, Takahashi I. Three-dimensional dynamic evaluation of a posed smile in normal occlusion and Class II malocclusion. Orthodontic Waves. 2013;72(4):131-41.
    The article mentioned above was selected as a most cited article in Orthodontic Waves journal in 2014.
  • Energy metabolism in human masseter muscle observed by mfMRI and 31P-MRS.
  • Gum-chewing-analysis of the patient with facial asymmetry using three-dimensional measurement by the high speed cameras
Educational
Educational Activities
It takes charge of spare practice of a dentistry department the fifth grade and the therapeutic practice of the sixth grade about the educational activity by the college education.And, it is being guided during the postgraduate education to the intern doctor.
Other Educational Activities
  • 2019.06.
  • 2019.01.
  • 2018.12.
  • 2015.11, The Award of Excellence and Best Presentation Award in 74th Annual Meeting of JOS.
  • 2015.03, Most Cited Orthodontic Waves Articles 2014.
  • 2007.09.
  • 2006.10.