Development of pathophysiology and clinical research diagnostic criteria for tooth clenching habit

本研究项目的第一部分是评估清醒时无疼痛的健康受试者在清醒时不知道磨牙症的自发口面部行为的发生和模式。受试者默读30分钟，同时在音频视频监控下进行测谎记录。对口面部行为进行评分，并计算咬肌爆发的活跃度和持续时间。在自发的口面部行为中，吞咽是最常见的。在所有检测到的咬肌爆发中，55%的咬肌爆发与功能性口面部行为有关，而45%被认为是非功能性的。大多数咬肌爆发持续不到2秒，活动不到最大自愿握紧的20%。这些值在相关的口面部行为类型之间没有差异。自发性的口面部行为可以用测谎仪来明确识别……更多的记录，因此非功能性咬肌肌电活动可以与功能性咬肌肌电活动区分开来。项目的第二部分旨在通过测谎和录音录像的方式，比较有和没有意识到咬牙习惯的受试者自发的口面部行为和咬肌活动的发生和形态。无论是口面部行为事件的数量、主观心理/感官测量还是未受刺激的全唾液流量在两组之间都没有差异。然而，与上述行为无关的咬咬发作在有意识的受试者中比对照组更频繁地发生，尽管两组之间的发作活动和持续时间没有差异。结果表明，在无压力的实验条件下，具有咬牙意识的非疼痛受试者出现了更多的非功能性咬肌爆发。因此，研究结果表明，在未来的研究中，肌电图测量可以建立生理诊断标准。少

First part of this research project was conducted to assess the occurrence and the modality of spontaneous orofacial behaviors of waking non-pain healthy subjects unaware of bruxism during wakefulness. Subjects read silently for 30 minutes while polygraphic recordings were made with simultaneous audio video monitoring. Orofacial behaviors were scored and the activity and duration of masseter muscle bursts was calculated for the types of orofacial behaviors. Among spontaneous orofacial behaviors, swallowing was most frequently observed. Out of all masseter muscle bursts detected, Fiftey-five percent of all masseter bursts were associated with functional orofacial behaviors while 45% were regarded as non-functional. Most masseter bursts lasted for less than 2 seconds with an activity less than 20% of maximal voluntary clenching. These values did not differ between the types of associated orofacial behaviors. Spontaneous orofacial behaviors can be specifically identified with polygraphic … More recording and thereby non-functional masseter EMG activity can be differentiated from functional masseter EMG activity.The second part of the project aimed to compare the occurrence and the modality of spontaneous orofacial behaviors and masseter activity between subjects with and without awareness of tooth clenching habit, using polygraphic and audio-video recordings. Neither the number of events for orofacial behaviors, subjective psychological/sensory measures nor unstimulated whole salivary flow rate did not differ between the groups. However, masseter bursts unrelated to the above behaviors occurred more frequently in subjects with awareness than controls although the burst activity and duration did not differ between two groups. The results suggest that non-pain subjects with awareness of tooth clenching showed the increased number of non-functional masseter bursts under non-stressful laboratory condition. Thus, the results suggest that the physiological diagnostic criteria could be established using EMG measures in the future study. Less