若年発症顎関節症の臨床研究 : 本症患者の顎顔面頭蓋の形態に関する検討

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The subjects were 29 patients under 20 years old (6 males and 23 females: T-group) of TMJ arthrosis who visited the Department of Oral Surgery at Nagoya University Hospital, the Department of Dent-Oral Surgery at Nagoya University Branch Hospital and the Lion Foundation for Dental Health.They were classified on the relation of the first molars occlusion with their plaster models of dentition. And so, on their cephalograms, 16 angular, 11 linear measurements and 6 ratio of two lines were analized and compared with those of 117 females under 20 years who did not have TMJ arthrosis (N-group). The following results were obtained: 1. The result of classification of their occulusion showed no existence of normal occulusion and Angle class I: 7 (male O, female 7·T-I), calss II: 15 (m. 4, f. 11: T-II), class III: 7 (m. 2, f. 5: T-III) 2. On T-I group, frontal growth of the maxilla and the ramus height of the mandible were apparently inferior to those of N group, the mandibular plane angle was larger, and the mandible showed clockwise rotation. 3. On T-II group, low frontal growth of the maxilla, more uprighting of the upper central incisor, and low growth of the ramus height and the mandibular body length, and clockwise rotation and retrusion of the mandible were observed. 4. On T-III group low frontal growth of the maxilla was observed. From the results, it was guessed that TMJ arthrosis in young people of these patterns of the growth of maxilla and mandible were closely related to discordance with Mm.masticatorii or the lack of resting occulusion.

若年発症顎関節症の臨床研究 : 本症患者の顎顔面頭蓋の形態に関する検討

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