摘要
目的:探讨不同垂直颅面结构的嚼肌超声厚度和肌电活动之间的关系。方法:根据SN-MP、FH-MP和FHI,将30名女大学生分为2组(高角14例、低角16例),应用B超测量姿势位和紧咬位的嚼肌厚度,表面电极测量姿势位和紧咬位的嚼肌肌电活动。采用SPSS11.0软件包对数据进行分析,以独立样本t检验比较高、低角组间各项测量值的差异,Pearson相关分析评价嚼肌超声厚度和肌电活动之间的相关性。结果:低角组浅层嚼肌厚度在姿势位(P=0.009)和紧咬位(P=0.000)均大于高角组,具有显著性差异;在姿势位,低角组与高角组之间嚼肌肌电活动差异无统计学意义;在最大紧咬位,低角组的肌电活动显著大于高角组的肌电活动,差异有统计学意义(P=0.022);姿势位时,嚼肌厚度与最大紧咬位肌电活动呈正相关(低角组r=0.61,高角组r=0.38);紧咬位时,嚼肌厚度与最大紧咬位肌电活动也呈正相关(低角组r=0.73,高角组r=0.53)。结论:不同垂直骨面型的嚼肌形态功能不同,低角骨面型的嚼肌超声厚度与肌电活动均大于高角组。
PURPOSE： To study the relationship between ultrasonographic thickness and EMG activity of the masseter muscle in subjects with different vertical craniofacial morphology. METHODS： Thirty female students were separated into two groups （14 cases with high-angle, 16 cases with low-angle） based on SN-MP angle ,FH-MP angle, and FHI. The thickness of the masseter muscle under relaxed conditions and during maximal clenching was assessed by uhrasonography. EMG activity of the masseter muscle under relaxed conditions and during maximal clenching was recorded with bipolar surface electrodes.All measurements were analyzed with SPSS 11.0 software package. Differences between groups were tested for statistical significance using Student＇s t test. The relationship between masseter muscle thickness and its EMG activity was estimated by Pearson＇s correlation coefficient. RESULTS ： The thickness of the masseter muscle in the low- angle individuals was significantly greater than that in the high-angle individuals under relaxed conditions （P=0.009） and during maximal clenching （P=0.000）. Although there was no significant difference in resting EMG activity between the two groups, the EMG activity of masseter muscle in the low-angle individuals was also significantly higher than that in the high-angle individuals during maximal clenching （P=0.022）. Relaxed thickness of masseter muscle was significantly correlated with its mean maximum EMG activity in the low-angle group （r=0.61, P=0.003） and moderately correlated with that in the high-angle group （r=0.38, P=0.023）. Similar correlation was found between contracted thickness of masseter muscle and the mean maximum EMG activity, being significantly correlated in the low-angle group （r=0.73, P=0.002） and moderately correlated in the high-angle group （r=0.53, P=0.O06）. CONCLUSIONS： The present findings support the concept that subjects with different vertical craniofacial morphology have different form and function of masseter muscle. The uhraso
出处
《上海口腔医学》
CAS
CSCD
2008年第5期529-534,共6页
Shanghai Journal of Stomatology
关键词
嚼肌厚度
超声
肌电图
头影测量
Masseter muscle thickness
Ultrasonography
Electromyography
Cephalometry
