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

2013 Fiscal Year Final Research Report

• Project/Area Number: 23592837
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Prosthetic dentistry
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: NISHIYAMA Akira 東京医科歯科大学, 歯学部附属病院, 助教 (40359675)
• Co-Investigator(Kenkyū-buntansha): OTA Takenobu 東京医科歯科大学, 歯学部, 非常勤講師 (50436606) ; TSUKAGOSHI Kaori 東京医科歯科大学, 歯学部, 社会人大学院生 (60456217)
• Project Period (FY): 2011 – 2013
• Keywords: 顎関節症 / VDT作業 / 寄与因子

Research Abstract

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.