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ABSTRACT
In order to discover the prevalence of signs and symptoms of temporomandibular disorders (TMD) in Japan, and the difference in the prevalence among various sex and age groups in the Japanese population, 672 individuals (304 males and 368 females, age range 20–92 years) were selected randomly in Okayama City, Japan, and were investigated by means of questionnaires and clinical examinations. The reported frequency of symptoms was: TMJ sounds 24%, facial-TMJ-jaw pain 11%, headache 27%, teeth clenching 30%, and grinding 34%. The percent frequency of the following signs was: impaired mouth opening 5%, clicking 46%, reciprocal clicking 20%, crepitus 19%, TMJ tenderness 6%, and masticatory muscle tenderness 21%. The subjects with TMJ clicking were more frequently females than males. TMD signs and symptoms were found to be common in all age groups, but they were fewer in the older than in the younger age group. The younger-aged subjects with clicking appeared with significant frequency, whereas crepitus was populated with significant frequency by the oldest age group.
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Notes on contributors
Yoshizo Matsuka
Dr. Yoshizo Matsuka received his D.D.S. degree from the Okayama University Dental School and his Ph.D. degree from the same University in 1992. Dr. Matsuka is a research associate and a clinical instructor in the Department of Fixed Prosthodontics, Okayama University Dental School.
Hirofumi Yatani
Dr. Hirofumi Yatani received his D.D.S. degree from the Osaka University Faculty of Dentistry in 1980 and his Ph.D. degree from Hiroshima University School of Dentistry in 1985. Dr. Yatani is an associate professor in the Department of Fixed Prosthodontics, Okayama University Dental School.
Takuo Kuboki
Dr. Takuo Kuboki received his D.D.S. degree from the Okayama University Dental School in 1986 and his Ph.D. degree from the same University in 1990. He worked as a visiting scholar in the Diagnosis Sciences & Orofacial Pain Department of the University of California Los Angeles from 1994 to 1995. Dr Kuboki is an assistant professor in the Department of Fixed Prosthodontics, Okayama University Dental School.
Atsushi Yamashita
Dr. Atsushi Yamashita received his D.D.S. degree from the Osaka Dental University in 1958 and his Ph.D. from the same University in 1965. Dr. Yamashita is a professor and a chairman in the Department of Fixed Prosthodontics, Okayama University Dental School. He is also a visiting professor at the Osaka Dental University and Hiroshima University School of Dentistry.