| Project/Area Number |
20791599
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Orthodontic/Pediatric dentistry
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| Research Institution | Aichi Gakuin University |
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Principal Investigator |
MORITA Takumi Aichi Gakuin University, 歯学部, 講師 (60367612)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 顎関節症 / 下顎頭 / 関節円板 / 咬合高径 / 顎運動 / ウサギ / 外側翼突筋 / 咬筋 / 筋電図 / 顎関節 |
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| Research Abstract |
In decreased occlusal vertical dimension, jaw movement and electromyogram activity were recorded. And we studied the relation between movements of the mandibular condyle and alteration of occlusion. The experiment which after cut the articular tubercle visualizes stress as mandibular condyle movement in the articular tubercle direction was conducted as preliminary step for investigate influence of cut the molar region. In tubercle cutting side was working side case, modification in the movement caused as project forward in occlusal phase. Additionally, trajectory of motion shifted in an anterosuperior direction in the period when activity of the jaw closing muscle does not occur as opening phase. This shows that articular tubercle received stress by resting tension of jaw closing muscle and elastic force of skin. Moreover when cut the molar region on the ipsilateral side, project forward movement in occlusal phase and trajectory of motion forward shift increased. This suggest that stress for articular tubercle increased.
Pathogenesis of temporomandibular disorder is considered multifactor, for example, occlusal abnormality, increase in muscle tone, lifestyle habit, mental stress. However, abnormal stress loading and abnormal jaw movement are essential for morphological defect of temporomandibular joint and abnormal position of articular disk.
This studies are expected to play an important role in revealing the pathogenesis of anterior dislocation of articular disk.
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