下颌前突患者升支矢状劈开术前后咀嚼肌肌电研究.docVIP

下颌前突患者升支矢状劈开术前后咀嚼肌肌电研究[摘要]目的测量下颌前突患者行正颌手术前后的肌电值，分析矢状劈开截骨术（SSRO）后咀嚼肌系统的变化，进一步探讨肌电的改变与术后咀嚼肌适应性改建之间的关系。方法选取18例接受SSRO治疗的下颌前突患者，记录术前及术后3个月、1年时主要咀嚼肌在功能运动中的电生理指标，计算相关参数并进行统计分析。结果下颌前突患者在正常状态下，大部分肌电指标低于健康对照组；行SSRO治疗后3个月，咀嚼肌的肌电指标有所下降，部分指标明显低于术前；术后1年，肌电指标较术前有明显上升，但部分仍低于健康对照组。结论正颌术后，咀嚼肌系统的重建是一个长期的过程，与术前相比较，咀嚼肌的性能得到了一定程度的改善。 [关键词]肌电图；不对称指数；活动量指数；功能储备指数 [中图分类号]R 782.2＋4[文献标志码]A[doi]10.3969/j.issn.1673-5749.2012.02.002 Electromyography analysis on masticatory muscles of patients with mandibular prognathism before and after sagittal split ramus osteotomyCao Jun, Tang Enyi, Yang Xudong, Pu Yumei, Lu Mingxing.（Dept. of Oral and Maxillofacial Surgery, The Affiliated Stomatological Hospital, Nanjing Medical University, Nanjing 210029, China） [Abstract]ObjectiveTo record the electromyography（EMG）of mandibular prognathism patients before and after orthognathic surgery, analyse the change process of masticatory muscles system after sagittal split ramus osteotomy（SSRO）and further explore the relationship between the electromyography changes and the adaptive remodeling of masticatory muscles. MethodsWe selected 18 simply mandibular prognathism patients who will accept SSRO. Recorded the electrophysiological parameters of masticatory muscles before the operation, after 3 months, after 1 year, and then calculated and analysed the parameters. ResultsThe mandibular prognathism pa－tients had lower EMG indexes under normal conditions. 3 months after SSRO, most of EMG indexes came down which were significantly lower than preoperative group. 1 year after SSRO, most of the EMG indexes improved a lot, while some of them were still lower than control group. ConclusionReconstruction of masticatory muscle system after SSRO is a long-term process. The performance of masticatory muscles was improved by SSRO. [Key words]electromyography；asymmetry index；activity index；mastication index 下颌前突是临床上最常见的骨性错畸形之一。下颌骨的过分生长打破了颌面部的发育平衡，严重影响了患者的面部美观和咀嚼功能。单纯的正畸治疗往往难以取得满意的效果，常常需要依靠正颌手术纠正过度发育的下颌骨，在此基础上再