单侧下颌骨发育过度畸形咀嚼肌肌电活性的研究

目的：研究下颌骨发育性不对称畸形患者下颌骨附丽肌的功能状况，探讨该类畸形与咀嚼肌肌电活性的关系。方法：以１０例成年单侧下颌骨过度发育性不对称畸形患者为研究对象，通过肌电图仪测试双侧颞肌、咬肌、二腹肌在功能活动时的肌电变化，进行该类患者双侧咀嚼肌肌电活性比较；并以１０例正常下颌骨双侧咀嚼肌肌电活性作为对照。结果：在单侧下颌骨发育过度性不对称畸形患者中，双侧咀嚼肌的肌电活性具有显著差异，其双侧肌电活性

Surface electromyogrphy analysis of masticatory muscles in the cases with unilateral mandibular hyperplasia

Ojective:To study the masticatory muscle activity in the cases with unilateral mandibular hyperplasia and the relationship between the deformity and the muscle activity.Methods:Surface electromyography (EMG) of temporalis,masseter and digastric was recorded in 10 adult cases with unilateral mandibular hyperplasia,The EMG of the normal side was compared with that of the abnormal.Meanwhile,the EMG of the 10 cases was compared with that of 10 healthy subjects.Results:The results showed that there was significant difference between the integrals of EMG obtained from two sides in 10 cases.The EMG of temporalis and masseter of the abnormal side was weaker than that of the normal side ( P <0.05), while that of digastric of normal side was weaker than that of the abnormal side( P <0.01).The differences of the integrals of EMG of temporalis,masseter and digastric of both sides in the cases with unilateral mandibular hyperplasia were stronger than those in healtly contrds.Conclusion:Mandibular hyperplasia may result in unbalance of the functions of masticatory muscles of two sides.