Clinicostatistical Study of Orthognathic Surgery in Our Department for 10 Years.

Orthognathic surgery was performed on 180 patients from 1984 to 1993 in our clinic. There were 42 male and 138 female patients with a mean age of 20 years. 154 patients (85.5%) were diagnosed with mandibular prognathism. 160 patients (88.9%) underwent sagittal splitting ramus osteotomy (Obwegeser-Dal Pont's method). 29 patients underwent Le Fort I osteotomy. The average time of operation and the average blood loss during operation were 3 hr 41 min and 583 ml for sagittal splitting ramus osteotomy with tongue reduction, 3 hr 13 min and 580 ml for sagittal splitting ramus osteotomy, 4 hr 51 min and 926 ml for Le Fort I osteotomy, 5 hr 49 min and 1, 091ml for two jaw surgery. Tongue reduction (Egyedi-Obwegeser's method) was carried out on 113 patients (62.8%) 169 patients (93.9%) received autologous blood transfusion, and 72% of blood loss was replenished by autologous blood transfusion.