| Project/Area Number |
07672224
|
|---|
| 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 | Nagsaki University |
|---|
Principal Investigator |
SUZUKI Hiroyuki Nagasaki University Dept of Orthodontics Assoc.Prof., 歯学部, 助教授 (70018753)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TANAKA Ryuichi Nagasaki University Dept of Orthodontics Assis.Prof, 歯学部, 助手 (10188352)
CHIKUBA Satoshi Nagasaki University Dept of Orthodontics Assis.Prof, 歯学部・附属病院, 助手 (50244075)
|
|---|
| Project Period (FY) |
1995 – 1996
|
| Project Status |
Completed (Fiscal Year 1996)
|
| Budget Amount *help |
¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
|
|---|
| Keywords | bone morphometry / bone remodeling / stress analysis / finite element methods / orthodontic force |
|---|
| Research Abstract |
The purpose of this study was to predict (1) the morphological changes in the treatment of reversed occlusion with chin-cap appliance, based on the reletionship between of stress generated in bone and piezo and stream potential. (2) the change of direction and attached portion of masster influenced the stress distribution in the maxilla and mandible. Relationship between bone remodeling (direction of haversian canals) and stress distribution in upper and lower jaw.
The vascular system provides many of the undifferentiated cells that are partly responsible for reconstructinal changes. The osteoclasts seem tobe deriverd from cells transported by way of the blood vessels while osteoblasts and fibroblasts are derived from local cells. The transmission of mechanical stimuli into specific cellular activity, such an increased mitotic activity and differentiation of specialized cells in the periodontal ligament of a tooth that has been exposed to an external force, is not fully understood. The canges that occur in alveolar bone during tooth movement have also been interpreted in relation to a piezoelectric effect through strain-generated potentials, arising as a result of mechanically induced deformation of collargenor hydroxyapatite crystals.
Results : Remarkable principal stress distribution in the antrior portion of condyloid process and menton.area.
When the attached portion of masster changed posteriorly, the occlusive force decreased and the principal compression stress decreassed in the anterior portion of mandible and increased in the posterior portion of mandible. The size of principal stress in high angle case was smaller than that in low angle case in the alveolar bone and greater in the anterior and posterior border of mandible ramus,
|
