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目的 颌面部的骨性畸型，必须通过正畸和外科手术联合的正颌治疗，才能达到功能和美观的正常。作者对正颌手术前后主要的咀嚼肌收缩力进行检查，以期发现术后口颌系统咀嚼效率的变化特征。方法 肌电图仪测试咬肌、颞肌、二腹肌在功能活动时的肌电变化，并对正颌前后作对比研究。结果 在下颌骨休息位时，肌电变化无显著性差异；功能活动时，肌电变化有显著性差异。结论 正颌后咀嚼肌的效能降低，存在不良咬牙合，提示手术后进行正畸治疗非常重要。
Purpose Bone malformations in maxillofacial region must be treated by orthognathic surgery combined with orthognathic surgery in order to achieve normal function and aesthetics. The author examined the main masticatory muscle contractility before and after orthognathic surgery in order to find out the characteristics of masticatory efficiency of the oral jaw system. Methods EMG test masseter muscle, temporal muscle, abdominal muscle in the functional activity of the EMG changes, and before and after orthognathism for comparative study. Results There was no significant difference in EMG between mandibular rest position and functional EMG. Conclusion Orthodontic masticatory muscle after orthodontic efficacy decreased, there are bad bite occlusion, suggesting that orthodontic treatment after surgery is very important.