Investigation of effects of VDT work on the onset, duration, and deterioration of TMD

本研究旨在确定在日本工作人群中影响颞下颌关节紊乱病(TMD)发病率的因素。受试者包括来自这四家日本公司的4771名员工。受试者使用问卷进行评估，包括TMD、影响因素(使用5分数字评分表)和视觉显示终端(VDT)的工作时间。从问卷上的4个项目(使用5分数字评分标准，0-4)测量TMD。TMD组占受试者的7.7%。Logistic回归分析显示，女性、一侧咀嚼、过度紧张、疲劳、躯体疼痛和下颌骨高速公路间隙消失是影响TMD表现的重要因素。TMD组VDT作业时间明显长于非TMD组。

This study aimed at identifying the factors that influence the incidence of temporomandibular disorders (TMD) in a Japanese working population. Subjects comprised of 4771 employees from the four Japanese companies. The subjects were assessed using a questionnaire that covered TMD, contributing factors (using a 5-point numeric rating scale) and the time of visual display terminal (VDT) work. TMD were measured from 4 items on the questionnaire (using a 5-point numeric rating scale, 0-4). The TMD group constituted 7.7% of the subjects. Logistic regression analyses indicated that female gender, one side chewing, excessive tension, tiredness, body pain, and the disappearance of the mandibular freeway space were significant contributors to the manifestation of TMD. The VDT work time was significantly longer in the TMD group than in the non-TMD group.