Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Riichi Ouchida Last modified date:2022.05.06

Lecturer / Division of Fixed Prosthodontics Faculty of Dental Science Kyushu University / Oral Rehabilitation / Kyushu University Hospital

1. Complication rates and types for implants provided at the Kyushu University Hospital.
2. Development of a dynamic dental implant surgical navigation system for hybrid design in a model and 3D digital CT image
3. Byunghyun Cho, Riichi Ouchida, Makoto Hashizume, Development of Surgical planning using a depth-adjustable drill
burr for dental implant placement, CARS 2017 (Computer Assisted Radiology and Surgery), 2017.06, Dental implants surgery requires accurate placement of dental implants at a desired location on the maxillary and mandibular bone. Surgical techniques using computed tomography (CT)-based dental imaging such as surgical guided template and surgical navigation have been allowing for minimally invasive surgery [1, 2].
Since surgical navigation in implant dentistry has ability to visualize an imaging of the drill in the bone and the adjacent anatomical structures such as inferior alveolar nerve in real time, it would reduce surgical risks and improve clinical results. Preoperative precise implant planning is one of the most important procedures for dental implant surgery with surgical navigation because dental implants are intraoperatively placed according to the planned computer simulation
Conventionally, the ideal location of implant is virtually planned using 3-D planning software based on CT scan data, which surgeons conduct the planning using points moved by the mouse control to establish the desired location. However, there still remain some issues to transfer the preoperative plan the to the patient’s bone such as reflecting soft tissue thickness, the difficulties for accessing posterior site by limited the mouth opening and for manipulation of software 2-D slice.
In this study, we propose dental implant navigation with surgical planning using depth-adjustable drill burr without restricting the degrees of freedom of the drill trajectory and depth and applied in 5 real clinical cases including maxillary and mandibular bone.
4. Kazuhiro Koikawa,, Ohuchida Kenoki, Riichi Ouchida, Pancreatic stellate cells lead and promote the local invasion of cancer cells, by physically remodeling the extracellular matrix with a collagen fiber alignment in pancreatic cancer., 46th Annual Meeting of the American Pancreatic Association., 2015.11, Background and Aim: A specific cell population that lead the local invasion in cancer, are called as “leading cells”. Regulating the leading cells may lead to the control of cancer cell invasion. However, the underlying mechanisms of this phenomenon have.
5. Factors on the soft tissue form between the two implants in aesthetic site.
6. Effect of staged teeth extraction method in patients shifted from a natural tooth bridge to an implant bridge..
7. Byunghyun Cho, Masamichi Oka, Nozomu Matsumoto, Riichi Ouchida, Jaesung Hong, Makoto Hashizume, Warning navigation system using real-time safe region monitoring for otologic surgery, CARS 2012 (Computer Assisted Radiology and Surgery), 2012.06, Purpose We developed a surgical navigation system that warns the surgeon with auditory and visual feedback to pro- tect the facial nerve with real-time monitoring of the safe region during drilling.
Methods Warning navigation modules were developed and integrated into a free open source software platform. To obtain high registration accuracy, we used a high-precision laser-sintered template of the patient’s bone surface to register the computed tomography (CT) images. We calcu- lated the closest distance between the drill tip and the sur- face of the facial nerve during drilling. When the drill tip entered the safe regions, the navigation system provided an auditory and visual signal which differed in each safe region. To evaluate the effectiveness of the system, we performed phantom experiments for maintaining a given safe marginfrom the facial nerve when drilling bone models, with and without the navigation system. The error of the safe margin was measured on postoperative CT images. In real surgery, we evaluated the feasibility of the system in comparison with conventional facial nerve monitoring.
Results The navigation accuracy was submillimeter for the target registration error. In the phantom study, the task with navigation (0.7±0.25 mm) was more successful with smaller error, than the task without navigation (1.37 ± 0.39 mm, P < 0.05). The clinical feasibility of the system was con- firmed in three real surgeries.
Conclusions This system could assist surgeons in preserving the facial nerve and potentially contribute to enhanced patient safety in the surgery..
8. The cases substituted from a removable partial denture for an implant bridge by the staged teeth extraction method .
9. The cases substituted from a natural tooth bridge for an implant bridge by the staged teeth extraction method .
10. Cases of single implant placement from the perspective of the adjacent bundle bone in the aesthetic area.
11. Cases of multiple implant placement from the perspective of the type of adjacent tooth in the aesthetic area.
12. A case of successful implant treatment in the aesthetic site combined with clinical crown-lengthening to adjacent teeth..
13. The role of bundle bone of adjacent natural teeth for single implant placement in the aesthetic site.
14. Effect of staged teeth extraction method in patients shifted from a removable partial denture to an implant bridge.