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54 cases were diagnosed as temporomandibular joint arthrosis in young people at Nagoya University (Dent-Oral Surgery, School of Medicine), Fujita-Gakuen Health University (Dent-Oral Surgery, School of Medicine) and Lion Foundation for Dental Health between April 1983 and September 1985 (2.5-year period). They were studied in terms of clinical statistics, yielding the following results.1. The percentage of subjects at Hellman's occlusal developmental stage IV A was 87.0 %in patient group and 80.0% in normal group. The mean age was 15.8 years old in patient group, 17 years old in normal group.2. Angle's classification II and III were seen in 42.6% and 29.6% of patient group, 15.0% and 3.3% of normal group.3. The percentage of subjects with malocclusion was 90.7% in patient group, which was greater than that of normal group (60.0%). The most malocclusions in patient group were upper protrusion (29.6%) and crowding (53.6%). In normal group, 20% had upper protrusion and 33.4% had crowding.4. Of the subjects in patient group, 25.9% had 31 dentes, which was greater than the 11.7% having 31 dentes in normal group.5. In patient group, 22.2% had 3 third molars and 7.4% had 1, which exceeded normal group, in which 11.7% had 3 and 6.7% had 1. In 42.6% of patient group the dentes were asymmetric and in 31.5% of those cases the asymmetry was both vertical and horizontal.In normal group, the corresponding percentages were 26.7% and 16.7% respectively.

Odontological studies on temporomandibular joint arthrosis in young people. Studies on occlusion and tooth material.