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目的:建立咀嚼肌表面肌电图(sEMG)与下颌运动轨迹描记仪(MKG)同步记录技术,联合分析正常牙合下颌运动的特性。方法:应用sEMG和MKG同步记录20例正常牙合青年志愿者在牙尖交错位(ICP)、下颌姿势位(MPP)、咀嚼等7种下颌运动状态下咬肌、二腹肌前腹的肌电活动和下颌运动轨迹,并进行时域和相关性分析。结果:sEMG时域分析显示,不仅各咀嚼肌肌电的幅值、平均肌电值(AEMG)和峰值在不同下颌运动中有不同程度的差异,而且在同一种下颌运动中各咀嚼肌肌电的幅值、平均肌电值AEMG和峰值均有显著性差异(除在ICP和MPP的幅值、峰值,在ICP和最大开闭口的AEMG外)。MKG的同步检测和分析表明各参数中倾斜度(Slant)、垂直位移(Vertical)、前后位移(A./P.)在不同下颌运动中也具有显著性差异,并与sEMG参数有一定的相关性。结论:通过sEMG与MKG同步记录和联合分析下颌运动的方法,可以分析下颌运动的特征性参数。
Objective: To establish a synchronous recording technique of sEMG and MKG to analyze the characteristics of mandibular movement of normal occlusion. Methods: Twenty males of normal occlusion were recorded simultaneously with sEMG and MKG in masseter muscles of the mandibular movement state including the cusp position (ICP), mandibular position (MPP) and chewing. The anterior abdominal muscles Electrical activity and mandibular motion trajectory, and time-domain and correlation analysis. Results: The time-domain analysis of sEMG showed that not only the amplitude of EMG, average EMG and peak value of different masticatory muscles were different in different mandibular movements, but also in the same kind of mandibular movement, The mean EMG AEMG and peak values were significantly different (except for the amplitude and peak values of ICP and MPP, except for ICP and maximum AEMG opening and closing ports). Simultaneous detection and analysis of MKG showed that Slant, Vertical and anterior / posterior displacement (A./P.) In each parameter also had significant difference in different mandibular movements and had some correlation with sEMG parameters Sex. CONCLUSIONS: The characteristic parameters of mandibular motion can be analyzed by synchronously recording and analyzing the jaw movement with sEMG and MKG.