若年発症顎関節症の歯科学的研究 不正こう合と歯列弓計測

Abstract

Values for eleven orthodontological parameters were obtained in 42 cases of TMJ arthrosis in girls (T group; averageage: 15 years 11 months) who sought examination at the Department of Oral Surgery at the Attached Hospital of the Nagoya University School of Medicine, the Department of Oral Surgery at the Fujita-Gakuen Health University Hospital and at the Lion Foundation for Dental Health. The values were also obtained in 49 control females (N group; average age: 18 years 2 months). The parameters studied were: 1. Angle's classification, 2.Σ 5-5 (mesio-distal crown diameter)(A), 3.Σ 3-3 (mesio-distal crown diameter)(B), 4. Basal arch length, 5. Basal arch width, 6. Coronal arch length, 7. Coronal arch width, 8. Inter canine length, 9. Inter canine width, 10. B. A. L./A, B. A. W./A, C. A. L./A, C. A. W./A, I. C. L./A, I. C. W./A. 11. I. C. L./B, I. C. W./B etc. The values obtained were subjected to stochastic analysis (t-test) and the following results were obtained: 1. With respect to Angle's classification in the T group, 9.5% were found to have normal occlusion and 45.2% were found to be Angle II cases. In the N group, 30.6% had normal occlusion and 14.3% were Angle II cases. 2. Maxillary basal arch length in the T group was 19.826±2.9081mm, while mandibular basal arch length was 18.3667±4. 7735mm. In the N group, maxillary basal arch length was 23.2775±2.6377 mm, while mandibular basal arch length was 20.2877±4.1162 mm. Therefore smaller values were obtained in the T group. 3. With respect to occlusion status, abnormalities in the dental arch analysis were found to be frequent among normal occlusion, Angle I and Angle III cases in the T group. 4. Abnormalities in the dental arch analysis were not found in Angle II cases.