부산대학교 도서관

To evaluate the relationship between the onset evants and gender, age and type of TMD, 809 of 912 patients visited and diagrosed as TMD were investigated.One hundred and ninety-eight patients (24.5% of 809 cases) noticed the onset events. The gender and age distributions were in significant. By type there were more patients belonging to type II and IV that noticed the onset events than those in type I and III, however no significant difference was observed between the other types respectively.All onset events were classified into seventeen categories, and the most frequent 4 items were: wide opening of the mouth (62 patients, 31.3%), extrinsic trauma (40 patients, 20.2%), occlusal change (37 patients, 18.7%) and masticating tough food (35 patients, 17.7%). The percentage of these 4 items was 87.9%. As for extrinsic trauma, the rate of males was significantly higher than that of females. The age of the patients who noticed the occlusal change tended to be middle age.The relationship of malocclusion, day clenching and night bruxism with the awareness of the onset event was statistically in significant.