| Project/Area Number |
12671999
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
矯正・小児・社会系歯学
|
|---|
| Research Institution | OKAYAMA UNIVERSITY |
|---|
Principal Investigator |
MIYAWAKI Shouichi Okayama University, Dental Hospital, Assistant professor, 歯学部・附属病院, 講師 (80295807)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Teruko (TAKANO Teruko) Okayama University, Graduate School of Medicine and Dentistry, Professor, 大学院・医歯学総合研究科, 教授 (00127250)
MATSUMOTO Toshirou Kinki University, Scinece and engineering, Professor, 生物理工学部, 教授 (50110242)
|
|---|
| Project Period (FY) |
2000 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
|
| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥3,000,000 (Direct Cost: ¥3,000,000)
|
|---|
| Keywords | Temporomandibular joint / Mechanical stress / Masticatory jaw movement / Masticatory muscle activity / Temporomandibular disorder / Antetror disc displacement / Finite element model / 顎関節内障 / モデル / 筋活動 |
|---|
| Research Abstract |
Mandibular movement with 6 degrees of freedom and jaw-closing and opening muscles were taken during mastication, open-close jaw movement and voluntary clenching in 10 normal subjects, 10 patients with temporomandibular joint (TMJ) internal derangement, and 10 patients with unilateral posterior crossbite, Morphological image data were also taken in all subjects. The real time scale was transformed to normalized time. CT of head including TMJ were taken in one of above subjects. 3-D finite element model was made in a computer by using CT images and medical fast imaging finite element model making program. Using this model and morphological image data in each subject, respective finite element model was made. It was assumed that CT values on the image were proportional to the bone mineral density and the elastic moduluses of each bone were proportional to the cube root of the bone mineral density. The mechanical parameters were maximum principal and von Mises stresses on the condylar, mandibular fossa, articular disc and mandible. The forces of aforementioned muscles were derived from the equation of equilibrium of moment. The model to calculate the mechanical stress to TMJ was made by using aforementioned data and model. We revealed for the first time that the displacement of the condyle on the chewing side was greater in the direction of the mandibular fossa than that on the non-chewing side, that disc displacement inhibited the condylar motion during mastication and open-close jaw movement, and that the condyle on the posterior crossbite side moved more in the direction of the mandibular fossa, during mastication. In all subjects, almost same results were calculated by using aforementioned model. Therefore, we confirmed that our model to calculate the mechanical stress to TMJ was valid.
|
