EMG Analysis of Jaw Closing Muscle Reflex in Patients with Mandibular Prognathism. Chin Tap Silent Period.:Chin Tap Silent Period

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概要

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• The purpose of this study was to investigate the neurophysiological function of jaw closing muscles in patients with mandibular prognathism by using a polysynaptic jaw reflex electromyographically. Silent period (SP) was evoked in 5 normal subjects (C group: 5 males) and 5 patients with mandibular prognathism without skeletal asymmetry (P group: 5 males) during maximum clenching by tapping the center of the chin with a reflex hammer (20times), in which a microswitch was embedded to indicate the time of its contact with the chin. The latency and duration of SP in bilateral temporal and masseter muscles were analyzed electromyographically.<BR>The results were as follows:<BR>1. Both the latency and duration of SP in temporal and masseter muscles did not differ between habitual and nonhabitual chewing sides in both the C and P groups.<BR>2. The latency of SP in temporal and masseter muscles in the P group were not different as compared with the C group.<BR>3. The duration of SP in the P group showed significant prolongation as compared with the C group. In the P group, the duration of SP in temporal muscle was significantly prolonged as compared with that in masseter muscle, indicating the characteristic findings of mandibular prognathism.<BR>These results suggested that SP of jaw closing muscle, as a polysynaptic reflex, in patients with mandibular prognathism might have a depressive factor in the clenched state, especially in temporal muscle.

• 特定非営利活動法人 日本口腔科学会の論文

特定非営利活動法人 日本口腔科学会 | 論文

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