Botelho André Luís, Silva Bruno Caetano, Gentil Flávio Henrique Umeda, Sforza Chiarella, da Silva Marco Antonio Moreira Rodrigues
Faculty of Odontology of Ribeirão Preto, University of São Paulo Dept. of Ondontology Restoration, SP, Brazil.
Cranio. 2010 Oct;28(4):266-73. doi: 10.1179/crn.2010.034.
The aim of this study was to analyze the immediate effect of resilient splints through surface electromyography testing and to compare the findings with the electromyographic profiles of asymptomatic subjects. The participants were 30 subjects, 15 patients with TMD (TMD Group) and 15 healthy subjects (Control Group), classified according to Research Diagnostic Criteria (RDC/TMD) Axis I. A resilient occlusal splint was made for each patient in the TMD Group from two mm thick silicon to cover all teeth. The EMG examination was performed before and immediately after installing the splint. Three tests were performed as follows: 1. Maximum Voluntary Contraction (MVC) using cotton rolls (standards test); 2. MVC in maximal intercuspation position; and 3. MVC with the splint in position. The EMG signal was recorded for five seconds. EMG indices were calculated to assess muscle symmetry, jaw torque, and impact. There was a statistically significant difference when comparing the results among the study groups. The symmetry index values in the Control Group were higher than the TMD Initial Group and similar to the TMD Group after the installation of the splint. The index values of torque were higher in TMD Initial Group when compared with the Controls. Impact values were lower than normal values in the TMD Initial Group and restored upon installation of the splint. The resilient occlusal splints may be used as complementary or adjunctive treatment of temporomandibular disorders.
本研究的目的是通过表面肌电图测试分析弹性夹板的即时效果，并将结果与无症状受试者的肌电图特征进行比较。研究对象为30名受试者，其中15名颞下颌关节紊乱病患者（颞下颌关节紊乱病组）和15名健康受试者（对照组），根据研究诊断标准（RDC/TMD）轴I进行分类。为颞下颌关节紊乱病组的每位患者制作了一个由两毫米厚硅胶制成的弹性咬合夹板，以覆盖所有牙齿。在安装夹板之前和之后立即进行肌电图检查。进行了以下三项测试：1. 使用棉卷的最大自主收缩（MVC）（标准测试）；2. 最大牙尖交错位的MVC；3. 夹板就位时的MVC。肌电图信号记录五秒。计算肌电图指标以评估肌肉对称性、颌扭矩和影响。比较各研究组的结果时存在统计学显著差异。对照组的对称性指数值高于颞下颌关节紊乱病初始组，且与安装夹板后的颞下颌关节紊乱病组相似。与对照组相比，颞下颌关节紊乱病初始组的扭矩指数值更高。颞下颌关节紊乱病初始组的影响值低于正常值，安装夹板后恢复。弹性咬合夹板可作为颞下颌关节紊乱病的补充或辅助治疗方法。
