Buchner R, Van der Glas H W, Brouwers J E, Bosman F
Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University of Utrecht, The Netherlands.
J Oral Rehabil. 1992 Sep;19(5):495-511. doi: 10.1111/j.1365-2842.1992.tb01113.x.
A discriminant analysis has been applied on several electromyographic (EMG) parameters of the masseter and the anterior temporal muscles, related to clenching and the jaw-jerk reflex, to characterize jaw muscle function of patients with craniomandibular disorder (CMD) with respect to controls. The subject samples, matched for age, consisted of 20 females with myogenous CMD, and 20 symptom-free females. The jaw-jerk reflex was elicited by a downward-directed mandibular load, transmitted by a bite-fork causing a similar occlusion and bite-rise as a splint. The patients differed mainly from the controls by smaller maximum EMG activity in both muscle groups (P less than 0.05 with the bite-fork inserted). This finding was related to a smaller muscle strength as the EMG level did not improve with pain-free jaw muscles after therapy using a relaxation splint. Discriminating factors of secondary importance were an enhanced bilateral asymmetry in the muscle activity of the patients, and in the reflex amplitude normalized for background EMG activity. In all subject samples, the activity of the anterior temporal muscles decreased with respect to the masseter muscles when the bite-fork was inserted (P less than 0.05-0.001). The therapeutic effect of a relaxation splint may, in part, be related to a relief of the temporal muscles.
已对咬肌和颞前肌的几个与紧咬和下颌反射相关的肌电图（EMG）参数进行判别分析，以表征颅下颌疾病（CMD）患者相对于对照组的颌肌功能。年龄匹配的受试者样本包括20名肌源性CMD女性患者和20名无症状女性。下颌反射由向下的下颌负荷诱发，该负荷通过咬叉传递，导致与夹板类似的咬合和咬升。患者与对照组的主要差异在于两组肌肉的最大肌电图活动较小（插入咬叉时P小于0.05）。这一发现与肌肉力量较小有关，因为使用松弛夹板治疗后，无痛颌肌的肌电图水平并未改善。次要的判别因素是患者肌肉活动中双侧不对称性增强，以及针对背景肌电图活动进行归一化处理后的反射幅度。在所有受试者样本中，插入咬叉时，颞前肌的活动相对于咬肌有所下降（P小于0.05至0.001）。松弛夹板的治疗效果可能部分与颞肌的缓解有关。
