| Project/Area Number |
11671951
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | Nihon University |
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Principal Investigator |
SASAHARA Hiroshige Nihon University, School of Dentistry at Matsudo, Professor and Chairman, 松戸歯学部, 教授 (70050052)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Takachika Nihon University, School of Dentistry at Matsudo, Associate Professor, 松戸歯学部, 助教授 (90153808)
NEMOTE Kimiya Nihon University, School of Dentistry at Matsudo, Professor and Chairman, 松戸歯学部, 教授 (00050039)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Occlusal sound / High-frequency component / Jaw movement / Rhythmic maximal opening and closing movements / Movement velocity |
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| Research Abstract |
For the purpose of early diagnosis of temporomandibular joint dysfunction, we examined means of improving the occlusal sound measurement system, as well as changes in the coordination of temporomandibular joint components, the biodynamic and kinematic occlusal condition, and changes in the velocity of jaw movement, in order to verify the changes in the coordination of temporomandibular joint components in disc displacement frequently observed in daily clinical practice.
1. The purpose of the accelerometer and the setting of the pressure level were examined for the occlusal sound measurement system used for measurement of the kinematic occlusal condition, and the system was improved to enable it to be used easily in daily clinical practice. The parts of wave analysis was improved into a wave data analysis system by which waveforms related to jaw movement, including not only occlusal sounds but also the tracing of jaw movement and electromyogram (EMG), can be analyzed using a personal computer.
2. Changes in the kinematic occlusal condition and changes in the velocity of jaw movement were used as indices for the examination of healthy volunteers and subjects with temporomandibular joint dysfunction involving disc displacement, using high-frequency components of the occlusal sound. The results showed that the kinematic occlusal condition and jaw movement were unstable in subjects with temporomandibular joint dysfunction involving disc displacement. This suggested that disc displacement might have disrupted coordination between the condyle and the disc or the articular capsule, thereby destabilizing the temporomandibular joint, which is the fulcrum for jaw movement.
The findings suggested the possibility that abnormal disc placement, the primary cause of the click, might be detected early by verifying changes in the kinematic occlusal condition and the velocity of jaw movement.
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