肌电生物反馈在调节咀嚼肌群肌电活动中的作用

目的研究肌电生物反馈在调节咀嚼肌群肌电活动中的作用。方法选取安氏Ⅱ类下颌后缩畸形青少年病人20例，年龄
10~14岁，ANB角>6°，性别不限，记录肌电生物矫治前最大咬合位颞肌与嚼肌的肌电活动値及其活动比率作为对照组，记录肌
电生物反馈治疗期间和治疗结束后颞肌、嚼肌的肌电活动值及其比率变化作为实验组。分析肌电生物反馈治疗前后颞肌和嚼
肌肌电活动值及其颞肌/嚼肌活动比率的变化，探讨肌电生物反馈在调节颞肌和嚼肌肌电活动值及其活动比率的作用。结果
肌电生物反馈能有效加强颞肌的肌电活动值，颞肌肌电活动值治疗后比治疗前有效加强（P<0.05），颞肌/嚼肌活动比率升高，从
治疗前1.76±1.46，治疗后4.71±4.03，治疗后1 d 升至2.57±2.07，（t=4.86，P<0.05）。结论肌电生物反馈治疗能有效调节颞肌、嚼
肌的肌电活动值，维持颞肌/嚼肌肌电活动比值的升高。

Effect of biofeedback in regulation of masseter muscle myoelectric activities

Objective To investigate the effect of the biofeedback in regulating the myoelectric activities of the masseter muscles.
Methods Twenty orthodontic patients aged from 10 to 14 years with Angle Class II malocclusion, retrusive mandible, and an
ANB angle >6° were enrolled in this study. The muscular activities of the anterior temporal muscle and the masseter muscle
were evaluated before, during, and after biofeedback treatment by assessing the average integrated electromyogram and
temporal/masseter (T/M) ratio in the clenching status. Results The patients’ myoelectric activities of the anterior temporal
muscle was significantly increased after biofeedback treatment (P<0.05). The patients’ T/M ratio in the clenching status was
increased after the treatment (1.76±1.46 before treatment, 4.71±4.03 immediately after treatment, and 2.57±2.07 at 1day after
treatment; t=4.86, P<0.05). Conclusion Biofeedback treatment can regulate the activities of the anterior temporal and masseter
muscles and increase the T/M ratio in the clenching status.