咬合力および咬筋の筋活動量と筋横断面積を指標とした咬筋機能の評価

同时记录咬合力、咬肌厚度、咬肌横截面积与肌肉活动量的相关性。[方法]检测对象：正常齿男性15例，正常齿女性15例，年龄24±2.6岁。测量咬合力、咬合肌厚度、咬肌横截面积、最大咬合力和生理静息位的肌电。[结果]1.生理休息位咬合力与咬肌厚度、咬肌截面积的相关系数分别为0.62(p值：0.0002)和0.54(p值：0.0016)。最大咬合时相关系数分别为0.54(p值：0.0019)和0.52(p值：0.0027)。2.咬合力与肌电的相关系数为0.11(p值：0.59)。3.咬肌的变量解释通过对最大咬合力变量解释的分析，回归系数分别为-0.03和0.53。[结论]咬合力、咬肌厚度、咬肌横截面积与肌电的相关性检验表明，安静位咬合力与咬合力的相关性比咬合状态强。然而，在评价咬肌功能时，考虑静止状态下咬合力和咬合力厚度的情况更为简单。

In this study, examination was done on the correlation among bite force, thickness, cross-sectional area of masseter muscles and the quantity of muscle activities (EMG), which were recorded at the same time.【Method】 Examination objects : 15 normal dentate males and 15 normal dentate females (age : 24 ±2.6Y.). The measurement of bite force, thickness, cross-sectional area of masseter muscles and EMG were done during maximum clenching and physiological rest position. 【Analysis】 The intensity of related nature of the correlation of bite force, thickness, cross-sectional area of masseter muscles and EMG.The variable explanation of bite forces was examined by multiple regression analysis respectively.【Result】 1. The correlation coefficient of bite force and thickness, cross-sectional area of masseter muscles in physiological rest position were 0.62 (p value : 0.0002) and 0.54 (p value : 0.0016). And the correlation coefficients in maximum clenching were 0.54 (p value : 0.0019) and 0.52 (p value : 0.0027). 2. The correlation coefficient of bite force and EMG was 0.11 (p value : 0.59). 3. Variable explanation of masseter muscles according to the analysis of variable explanation of bite force in maximum clenching showed the regression coefficients were -0.03 and 0.53. And in rest position showed the regression coefficients were -0.05 and 0.52.【Conclusion】 From the examination of the correlation among bite force, thickness, Crosssectional area of masseter muscles and EMG showed that correlation between bite forces in rest position was stronger compared to the clenching condition. However, in evaluation of function of masseter muscles, it is simpler to consider the situation where the bite force and thickness in rest position.