The purpose of this study was to standardize and classify the coordination pattern among the chewing side and non-chewing side masseter and anterior temporal muscles, in terms of EMG values on lateral excursion, clenching, and mastication in prescence of the ocdusal interferance of the nonchewing side and canine guidance after the occlusal interferance of the non-chewing side.
In this study, 25 subjects were selected for experiment of lateral excursion, clenching and mastication and EMG value of the masseter and anterior temporal muscle on both sides were recored 2 times respectively. The bioelectric processor model EM2(Myo-tronics Research, Inc. U.S.A.) with the surface electrodes were used to record the EMG activity during all experimental procedures.
The rest´ `s were as follows
1. During lateral excursion on interferance of non-chewing side, the EMG values of the temporal muscle were significantly more promminant than -those of the masseter muscle on the chewing side and those of the masseter were significantly more prominant than those of the temporal muscle on the non.-chewing side. The EMG values of non-chewing side were significantly mare promir?.ant than those of chewing side on the both side masseter muscle and those of chewing side were significantly more prominant than those of non-chewing side on the both side temporal muscle.
2 During clenching on the occlusal interferance, the EMG values of non-chewing side masseter muscle were most prominent.
3. During mastication on the occlusal interferance, the EMG values of the chewing side temporal . muscle were most prominant and those of non -chewing side temporal muscle were the lowest. 4. The EMG values of temprral muscle of non-chewing side on interferance were significantly more
prominant than those of canine guidance during lateral excursion.
5. During clenching on the occlusal interferance, the EMG values of the masseter and the temporal muscles of the non-chewing side were significantly more promint than canine guidance, but those of chewing side temporal muscle on canine guidance were significantly more prominent than those of interferance.
6. During mastication on canine guidance, the EMG values of the temporal muscle on the chewing side, the masseter muscle on the chewing side and the temporal muscle on the
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