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

研究对象选自九州大学牙科医院的学生、大学职员和TMD患者。经过筛选问卷调查后，这些人在进入研究前进行了便携式肌电图（EMG）记录/分析系统的测试。根据数据，受试者被分为四组：磨牙伴咀嚼肌疼痛组、磨牙不伴咀嚼肌疼痛组、非磨牙伴咀嚼肌疼痛组和非磨牙不伴咀嚼肌疼痛组。对咀嚼肌进行触诊检查，并检查最大下颌开口范围。在实验性持续亚极量紧咬过程中，通过右咬肌肌内血流量和肌电监测，发现咀嚼肌痛受试者口颌系统对紧咬任务的反应模式因测量部位不同而不同。随着实验的进行，受试者的再灌注反应逐渐减弱，血管扩张能力逐渐减弱。采用肌电和三维下颌运动分析系统测量下颌咀嚼运动。在咀嚼肌包络分析中，咀嚼肌垂直开口的振幅有随咀嚼肌疲劳程度的增加而变化的趋势，咀嚼肌包络的视觉观察显示磨牙者咀嚼肌的垂直开口模式占优势。咀嚼肌痛存在着日变化，与夜间磨牙症和肌痛无明显关系。

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.