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성인에서 골격형 Ⅲ급 부정합자와 정상교합자의 근활성도에 관한 연구
김택수,손병화 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.3
The purpose of this study was to investigate the relationship among the activity of the craniofacial muscle and craniofacial form and occlusal state. In this study, subjects were consisted of 23 male adults with skeletal Class Ⅲ malocclusion and 30 male adults with normal occlusion. The measurements in oral exam, lateral cephalogram, and E.M.G. recordings of anterior temporal, masseter, and upper lip muscles at rest position, clenching in centric occlusion, chewing of gum, swallowing of juice, were analyzed with SPSS system. The results were as follows : 1. As rest position upper lip muscle activity of skeletal Class Ⅲ group was significantly higher than that of normal group. 2. Both clenching and chewing masseter and temporal muscle activity of normal group were significantly higher than tat of skeletal Class Ⅲ group. 3. During swallowing of juice, upper lip muscle activity of skeletal Class Ⅲ group were significantly higher than that of normal group. 4. The activities of masseter and anterior temporal muscle during clenching and chewing were significantly correlate with hypodivergent facial form and number of occluded teeth. 5. The activity of upper lip during swallowing had positive correlation with mandibular prognathism.