Clinico-statistical Study of Orthognathic Surgery

Abstract

Clinico-statistical study was carried out on 248 patients who underwent orthognathic surgery at the Second Department of Oral and Maxillofacial Surgery, Osaka University from 1977 to 1994. The results were as follows:
1. Male to female ratio was 1: 1.89.
2. The average age of male patients was 22.6 years old and 22.4 years old for female.
3. The diagnosis of mandibular prognathism was made for most patients. Twenty-seven patients (10.9 %) also had cleft lip and/or palate.
4. Sagittal split osteotomy was carried out on about 80 % of the patients.
5. The average operation time for sagittal split osteotomy was 184.5 min. and for simultaneous osteotomy was 259.4 min.
6. The average blood loss for sagittal split osteotomy was 575.4 ml, and for simultaneous osteotomy was 757.2 ml.
7. Recently screw osteosynthesis was carried out after using a repositioning system on the proximal segment.
8. Tongue reduction was carried out in 28 patients.