Abstract
The subjects were 39 female patients with juvenile TMJ arthrosis (T group) and 30 healthy females (N group) who visited the Dept. of Oral Surgery in the Dental Clinics of Nagoya University Hospital, Dept. of Oral Surgery in the Dental Clinics of Fujita-Gakuen Health University Hospital and the Clinics of the Lion Foundation for Dental Health during a period of 3 years and one month from April 1983 to April 1986. The following evaluations were made: 1) U 5 to occlusal plane angle, 2) U 6 to occlusal plane angle, 3) U 7 to occlusal plane angle, 4) U 5 to U 6 angele, 5) U 7 to U 6 angle, 6) U 5 to FH plane angle, 7) U 6 to FH plane angle, 8) U 7 to FH plane angle, and 9) FH plane to occlusal plane angle. The following results were obtained: 1. U 7 to occlusal plane angle in the T group (82.0±6.5) was significantly smaller than that in the N group (85.7±8.2). 2. U 7 to FH plane angle in the T group (113.0±6.8) was significantly larger than that in the N group (108. 4±8.5). 3. Significant differences between the T group (15. 2±4.2) and the N group (15.0±4.0) were not seen in terms of the FH plane to occlusal plane angle. 4. In conclusion, a majority of the T group patients showed a centrifugal inclination of the upper second molar.
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