Clinicostatistical Study on Orthognathic Surgery for 11 Years at Second Department of Oral and Maxillofacial Surgery, Osaka Dental University.

Orthognathic surgery was performed on 362 patients from 1987 to 1997 at the Second Department of Oral and Maxillofacial Surgery, Osaka Dental University.The results were as follows: 1. The male-female ratio was 1: 2.4.2. The mean age was 22.4 years old.3. The diagnosis of mandibular prognathism was made for most of the patients (89.2%).4. Sagittal splitting ramus osteotomy (SSRO) was performed on 274 cases (75.7%).5. The mean time of operation for SSRO was 3hr. 7 min±57min, and for mandibular body osteotomy was 3hr. 15min±60.7min.6. The mean blood loss during operation for SSRO was 275.8±221.4ml and for mandibular body osteotomy was 171.8±147.5ml.7. Paresthesia of the lip and mental area was observed in 404 sides after opration. 80.7% of patients treated for SSRO recovered within a year.8. TMJ were examined in 202 cases for 1 year after SSRO. The symptom of TMJ was recognized in 5 cases.