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Influence of Masseter Activity during Swallowing on Inducement of Nocturnal Bruxism
Full text linkP(論文)Bruxism during sleep may be attributable not only to attrition and periodontal disease of the teeth, but also to temporomandibular disorder. Detailed mechanisms for bruxism have not yet been established. Thus, this study was carried out in order to find out if masseter activity during swallowing has an effect on the inducement of nocturnal bruxism. Chronic recordings of the electromyogram (EMG), electroencephalogram (EEG), electrocardiogram (EGG), electro-oculogram (EOG), and respiration (RESP) during one night were made on five bruxiser (averaged age, 25.6) in a laboratory. Bruxism is usually to be defined as above 20% MVC of masseter EMG activities, and it's activity below 20% MVC was done as swallowing. The results were as follows : 1. The masseter activities of swallowing before bruxism were observed at 64.6% of all bruxisms. 2. Appearance rate of bruxism followed on swallowing was the highest at the stage 3 among sleep phases. 3. Bruxism was classified into three types, grinding, clenching and mixed types of the both. The grinding type of bruxism was observed in 49% of all bruxisms. Appearance rate of bruxism followed on swallowing was higher both in grinding and mixed types. 4. Certain changes of respiration were observed in 73% of bruxism just after swallowing. 5. HR and CVR-R tended to vary during bruxism. These results indicate that swallowing may not be necessary for bruxism, but might often induce bruxism when respiration was obstructed during deglutition.departmental bulletin pape
