Studies on temporomandibular joints in elderly Japanese:I: Macroscopic evaluation of autopsy condyles

概要

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An autopsy study was performed on 174 mandibular condyles of 96 elderly Japanese. The size, shape, frequency and type of the change on articular surface of the condyles in elderly Japanese were investigated. The mean age was 72.0 years in 59 males and 83.8 years in 37 females. The mean age in females was significantly higher than in males. The mean antero-posterior diameter of the condyles was 11.2±1.21mm in males and 10.8±1.41mm in females. The mediolateral diameter was 22.0±2.28mm in males and 20.1±2.97mm in females. The differences between the sexes were statistically significant. Concerning the shape of the condyle, the most predominant was elliptical in superior view (55.2%), slightly rounded in posterior view (62.6%), and rounded in lateral view (73.6%). There were no sex differences of the occurrence. The changes of the articular surface, such as step, concavity, projection were observed in 66 out of 168 condyles (39.3%), excluding 6 condyles with advanced deformity. The incidence was 32 out of 105 (30.5%) in males and 34 out of 63 (54.0%) in females. The occurrence was significantly higher in females than in males. In conclusion, those specimens could be utilized as a standard for Japanese elderly persons.
一般社団法人日本顎関節学会の論文