A clinico-statistical study of temporomandibular joint disorders

DOI 9 Citations 23 References
  • TOMA Takashi
    Department of Oral and Maxillofacial Surgery, Hiroshima City Hospital
  • IWATA Masahiro
    Department of Oral and Maxillofacial Surgery, Hiroshima City Hospital
  • NAKANO Makoto
    Department of Oral and Maxillofacial Surgery, Hiroshima City Hospital

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Other Title
  • 当科過去１０年間における顎関節症患者の臨床統計的検討

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Abstract

The etiology of temporomandibular joint disorders remains unclear, despite recent progress in several diagnostic methods. To obtain more information on this disease, we performed a clinical evaluation of 1, 660 patients with temporomandibular joint disorders, who visited our department during the 10 years from January 1990 to December 1999. They were classified into 5 types based on a new classification proposal advocated by the Japanese Society of Temporomandibular Joint in 1996. The patients consisted of 478 males and 1, 182 females, and the ratio of males to females was 1: 2.47. The distribution of age groups had two peaks, in the 20s and 50s. The type distribution in our cases was as follows: Type III was most frequent (48.4%), followed by Type II (22.3%), Type I (19.7%), Type IV (9.2%), and Others (0.4%). The recent transition is that Types III, II and IV are increasing, but Type I and Others remain on the side level. And age transition is that twenties and fifties are increasing, but another ages remain on the side level.

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