当科における顎矯正術施行例の臨床的検討

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We made a clinical evaluation of fifty patients who underwent a surgical correction in the Second Department of Oral Surgery, Fukuoka Dental College during the past 9 years. The results were as follows: 1. The number of patients showed a tendency to increase every year. 2. The ratio between males and females was 1: 5.3. The age ranged from 11.3 to 30.8 years with a mean age of 19.6 years. 4. All the patients were diagnosed as mandibular prognathism except one with only open bite. 5. As concerns operating methods, they were as follows: 27 cases by step ostectomy, 12 cases by Obwegeser-Dal Pont method and 5 cases by vertical ostectomy. 6. 20 cases with jaw deformities were done under pre or post-operative orthodontic treatment. 7. Bone resection in body ostectomy was mostly done on the first molars. 8. The extraction in body ostectomy was mostly done at both sides of premolar teeth. 9. On the condition and the number of extraction teeth, most of them had had dental prosthesis and conservation. 10. The average time of the operations was 3° 30 with a range from 2° 13 to 6°. 11. The average of bleeding was 209ml with a range from 31 to 626. 12. The average period of intermaxillary fixation was 51.4 days with a range from 25 to 68. 13. According to radiographic cephalometric investigation. (1) A-B difference ranged from-13.5° to 5° with an average of-3.8°. (2) According to Hanadas classification, they were classified as follows: 16 cases to group A, 7 cases to group B, 2 cases to group C, 9 cases to group D and 10 cases to group E. (3) On dento-facial changes after surgical correction, L1, Pog, and point B tended to move posteriorly on an average. U1, Gonial angle, Mandibular plane angle hardly changed. The change of overjet was more than that of overbite. Difference by operating methods was little.

当科における顎矯正術施行例の臨床的検討

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