McCarroll R S, Naeije M, Hansson T L
Department of Masticatory Function, ACTA, Academic Centre for Dentistry, University of Amsterdam, The Netherlands.
J Oral Rehabil. 1989 Sep;16(5):441-6. doi: 10.1111/j.1365-2842.1989.tb01363.x.
The balance in the electromyographic (EMG) activities of the left and the right masseter and the left and right anterior temporal muscles during chewing and during submaximal clenching at 10% and 50% of the maximum voluntary contraction in the inter-cuspal position was investigated in twenty healthy adults. Muscular asymmetry patterns during chewing and clenching were positively correlated for both pairs of masticatory muscles investigated at the 50% level (P less than 0.01-P less than 0.001) and for the masseter muscles, also at the 10% level (P less than 0.01). Stronger correlations in muscular asymmetry were found for the masseter muscles and at the higher submaximal clenching level. In general, the masseter muscles displayed a greater degree of asymmetric activity than the anterior temporal muscles during both chewing and clenching (0.05 less than P less than 0.1-P less than 0.025). The average EMG amplitudes of both masseter or both anterior temporal muscles within each subject showed no correlation between clenching and chewing. The correlations between muscular asymmetries observed during static (clenching) and dynamic (chewing) conditions suggest that there are common factors influencing these activities.
在20名健康成年人中，研究了在牙尖交错位时，咀嚼过程以及最大自主收缩的10%和50%的次最大紧咬过程中，左右咬肌和左右颞前肌的肌电图（EMG）活动平衡。在50%水平时，所研究的两对咀嚼肌在咀嚼和紧咬过程中的肌肉不对称模式呈正相关（P小于0.01 - P小于0.001），咬肌在10%水平时也呈正相关（P小于0.01）。在咬肌和更高的次最大紧咬水平上，发现肌肉不对称的相关性更强。总体而言，在咀嚼和紧咬过程中，咬肌的不对称活动程度均高于颞前肌（0.05小于P小于0.1 - P小于0.025）。每个受试者的双侧咬肌或双侧颞前肌的平均EMG幅度在紧咬和咀嚼之间无相关性。在静态（紧咬）和动态（咀嚼）条件下观察到的肌肉不对称之间的相关性表明，存在影响这些活动的共同因素。
