Clinico-statistical Analysis of the Orthognathic Surgery at the Department of Oral and Maxillofacial Surgery, Saga Medical School

Orthognathic surgery has been performed on 180 patients from 1980 to 1992 in our clinic.Male to female ratio of the total patients was 1: 2.2. The average age of male patients was 20.9 y. o. and 21.0 y. o. for females. Eighty percent of 180 patients were diagnosed as mandibular prognathism with open bite or facial asymmetries. Sagittal splitting ramus osteotomy was carried out on 70.4% of the patients.The average time of operation was recorded as follows: 3hr. and45min for sagittal splitting ramus osteotomy, 7hr. and 45 min for-two jaw surgery, 5hr. and45min for the combination of sagittal splitting ramus osteotomy and upper alveolar segmental osteotomy.The average blood loss during operation was as follows: 366.4ml in sagittal splitting ramus osteotomy, 666.7ml in two-jaw surgery, 575.3ml in combination of sagittal splitting ramus osteotomy and upper alveolar segmental osteotomy. Five patients received allogeneic blood transfusions, and one patient received autologous blood.Fixation of bone fragments was done as follows: 130 patients with circumferential wiring and 17 patients with bicortical screw fixation.The average period of intermaxillary fixation was 28.6 days in the case of circumferential wiring, 12.6 days with lag screws, 28.0 days with miniplates and 27.9 days with interosseous wiring.