THE EFFECT OF MASTICATORY MUSCLE PAIN AND NOCTUENAL BRUZISM TO THE JOW FUNCTION

研究对象来自九州大学口腔医院的学生、大学教职员工和TMD患者。在筛选问卷后，这些人在进入研究之前用便携式肌电(EMG)记录/分析系统进行测试。根据数据，受试者被分为四组：有咀嚼肌肉疼痛的磨牙者、没有咀嚼肌肉疼痛的磨牙者、没有咀嚼肌肉疼痛的非磨牙者和没有咀嚼肌肉疼痛的非磨牙者。对咀嚼肌进行触诊检查，并检查最大颌骨张开范围。在实验持续的次极量咬合任务中，当监测右咬肌的肌内血流和肌电时，咀嚼肌肉疼痛的受试者的口颌系统对咬合任务的反应模式可能会因测量地点的不同而不同。随着实验的进行，受累血管的扩张能力降低，这取决于观察到的再灌流反应减弱的受试者。利用肌电和三维下颌运动分析系统测量下颌骨的咀嚼运动。对于咀嚼包膜的分析，垂直张开的幅度随时间有不同的趋势，对咀嚼包膜的目测显示咀嚼肌疲劳的垂直张开模式占主导地位。本研究考察了几个因素，根据咀嚼肌痛的日变化，与夜间磨牙症和肌肉疼痛没有明显的关系。

The subjects were selected from the students, university employees and TMD patients of Kyushu university Dental Hospital. After a screening questionnaire, those people were tested by the portable electromyographic (EMG) recording/analyzing system before entry into the study. From the data, subjects were divided to the four groups : the bruxer with masticatory muscle pain, bruxer without masticatory muscle pain, non-bruxer with masticatory muscle pain, and non-bruxer without masticatory muscle pain. A palpatory examination of the masticatory muscle was performed and the range of maximum jow opening was examined. It seemed that the subjects with masticatory pain decrease of the area of jow movement.When the intramuscular blood flow in the right masseter muscle and EMG was monitored during an experimentally sustained submaximal clenching task, the pattern of responses of the stomatognathic system to the clenching task could differ in the subjects with masticatory muscle pain according to the measurement sites. It depends on the subjects that the diminished reperfusion response was observed that the involved blood vessels developed a reduced ability to dilate as the experiment progressed.And the measurement of lower jaw masticatory movement were measured using the EMG and 3-dimensional Mandibular Movement Analyzing system. Regarding the analysis of the masticatory envelope, there was tendency of the differ in the amplitude of vertical opening petter with the, the visual observation of masticatory envelopes showed the dominance of the vertical opening pattern of the bruxer with masticatory muscle fatigue.Several factors was examined in this research, there was no significant relation with nocturnal bruxism and muscle pain according to the day to day variation was existed in the masticatory muscle pain.