Abstract
A clinical evaluation was carried out on 284 patients who underwent orthognathic surgery from October 1975 for 19 years and 6 months at our hospital.
The results were as follows.
1) The male-female ratio was 1: 2.3.
2) The average age was 21.0 years.
3) Most of the patients (81.7%) came from Kumamoto Prefecture.
4) Mandibular prognathism was the predominant diagnosis (74.3%).
5) Sagittal splitting ramus osteotomy (Obwegeser-Dal Pont method) was performed on 268 patients.
6) The average operation time and the average bleeding amount during the operation were 2hr. 43min.±38min. and 192ml.±143ml. respectively for sagittal splitting ramus osteotomy.
7) From 1975 to 1993, 241 patients underwent circumferential wiring with 6-week intermaxillary fixation.
From 1993, 27 patients underwent rigid fixation by screws without intermaxillary fixation.
8) It was found that the incidence of temporomandibular joint symptoms in patients who underwent screw fixation was not much different from that of patients underwent circumferential wiring after surgery.
