A Clinical evaluation was carried out on 68 patients who underwent orthognathic surgery from 1981 for 10 years in the Second Department of Oral and Maxillofacial Surgery, Kagoshima University. The results were as follows: 1. The male-female ratio was 1: 2. 2. The average age was 20,8 years. 3. Mandibular prognathism was the most predominant diagnosis (66%). Ten(14%) out of 68 patient were accompanied with cleft palate. 4. The extent of mandibular set back in sagittal splitting osteotomy was

more »

... mm on the right side and 10.1mm on the left side in average. 5. Excision on the tongue in patients with possible macroglossia. The excised areas were 274.2mm2 in average (ranged from 180mm2 to 400mm2). 6. In sagittal splitting osteotomy, rigid fixation by use of metal or sapphire screws were employed with the maneuver for repositioning the mandibular condyle. In Le Fort I osteotomy, iliac bone graft and fixation with a miniplate and zygomatic suspension were employed. 7. The operation time for sagittal splitting mandiblectomy was 5hr. 41min. in average (ranged from 3hr. 12min. to 8hr.26min.), and in bimaxillary osteotomy was 7hr.12min. in average (ranged from 7hr. 17min. to 9hr.58min.). 8. The mean blood loss was 537.2m1 in the sagittal splitting mandiblectomy (ranged from 114m1 to 2140m1), 1041m1 in bimaxillary surgery (ranged from 494m1 to 2910m1). 9. The routine period of intermaxillary fixation in our department was 14 days for sagittal splitting mandiblectomy, and 21 days for Le Fort I osteotomy.