| Project/Area Number |
61480404
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
KOHNO Shoji Tokyo Medical and Dental University, 歯学部, 講師 (50014098)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Takahiro Tokyo Medical and Dental University, 歯学部, 助手 (70178747)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥4,700,000 (Direct Cost: ¥4,700,000)
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| Keywords | TMJ Dysfunction / Neck Muscle / Sternocleidomastoid Muscle / Occlusal Disharmony Anterior Guidance / EMG / Powerspectrum / 筋電図 / パワースペクトラム / 伸張反射 / 咬合病 |
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| Research Abstract |
TMJ patients with occlusal interferences often complain of pains not only in masticatory muscles but also in neck muscles. There are still unclarified points regarding the treatment and the causative mechanism of the pain in neck muscles. Therefore we made some studies focused on the pain in the Sternocleidomastoid Muscle ( SCM : the largest lateral neck muscle). As a result, we have made a remarkable achievements.
The outline of the results obtained will be described below.
1. We gave a guidance for the treatment of TMJ patients.
W had trported on clinical cases of TMJ patients with pain in SCM treated errectively by the reconstruction of proper anterior guidance.
2. We clarified the function of SCM during occlusal functions.
The pain in SCM occurs mainly in the insertion of the muscle (SCM-I) reather than in the middle part of the muscle (SCM-M). Therefore we made anatomical and electromyographical experiments to investigate the functional differentiation between the SCM-I and the SCM-M during occlusal functions.
From the anatomical observation, it was confirmed there are some variations between individuals in the number of belly of SCM. From the electromyographic analysis, it was revealed there are qualitative and guantitative differences between the EMG of SCM-I and that of SCM-M. The powerspectrum of the EMG from the SCM-I had low frequency band with a peak(12-13 Hz).This peak shows that the activity of the SCM-I during occlusal function can be regulated by stretch reflex of the muscle. On the other hand the EMG from the SCM-M bad higher frequency band. The power value of EMG of SCM-I was more increased than that of SCM-M in proportion to the increase of occlusal force. From these results,it reveals that SCM-I is active during occlusal functions and SCM seems to have a functional differentiation between insertion and middle part during occlusal function.
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