Harper R P, de Bruin H, Burcea I
Am J Orthod Dentofacial Orthop. 1987 Jan;91(1):70-6. doi: 10.1016/0889-5406(87)90211-3.
Electromyographic patterns of muscle activity were recorded in 11 patients with mandibular retrognathism and compared with ten normal subjects. Categorization of facial morphology was based on standard cephalometric data. Seven patients in the retrognathic group have been studied 1 year after mandibular-lengthening surgery. A computer-based data acquisition and analysis system with a Selspot movement monitoring system was used to record and quantify simultaneously both mandibular movement patterns and associated electromyographic data. Of particular interest was the pattern of activity for the lateral pterygoid muscles of all patients in the retrognathic group compared with controls. Both the ipsilateral and contralateral lateral pterygoids contracted during either right or left lateral excursions for eight of the 11 patients in the retrognathic group compared to aphasic activity during this movement as expected in the control group. However, all seven of the patients tested 1 year after mandibular lengthening demonstrated normal aphasic firing patterns of the lateral pterygoid muscles (inferior belly) during right and left lateral excursions. The retrognathic group of patients also demonstrated abnormal recruitment patterns of the lateral pterygoid muscles during border movements of the mandible in the preoperative stage. Recruitment patterns approached normal levels after mandibular advancement surgery. The number of patients studied did not permit accurate statistical analysis. However, a trend is apparent that demonstrates previously unreported abnormal activity patterns of the lateral pterygoid muscles and an adaptive response of these muscles to orthognathic surgery.
记录了11名下颌后缩患者的肌肉活动肌电图模式，并与10名正常受试者进行比较。面部形态分类基于标准头影测量数据。对下颌后缩组中的7名患者在进行下颌延长手术后1年进行了研究。使用基于计算机的数据采集和分析系统以及Selspot运动监测系统，同时记录和量化下颌运动模式及相关的肌电图数据。特别令人感兴趣的是，将下颌后缩组所有患者的翼外肌活动模式与对照组进行比较。下颌后缩组11名患者中有8名在右侧或左侧侧方运动时同侧和对侧翼外肌均收缩，而对照组在此运动时预期为失语活动。然而，下颌延长术后1年接受测试的所有7名患者在右侧和左侧侧方运动时翼外肌（下腹）均表现出正常的失语放电模式。下颌后缩组患者在术前阶段下颌边缘运动时翼外肌也表现出异常的募集模式。下颌前徙手术后募集模式接近正常水平。研究的患者数量不允许进行准确的统计分析。然而，一种趋势很明显，即显示出翼外肌以前未报告的异常活动模式以及这些肌肉对正颌手术的适应性反应。
