Clinical Study on Orthognathic Surgeries in Our Clinic

Abstract

Orthognathic surgeries have been performed on 76 patients from 1980 to 1991 at the Department of Oral and Maxillofacial Surgery, Miyazaki Medical College Hospital. The age of patients ranged from 16 to 40 years with an average of 21.0 years. The ratio of male to female was 1: 3. Most of them were the patients with mandibular prognathism, and developmental abnormalities of the mandible including open bites and facial asymmetries occupied 85.5 % of all the patients performed by the orthognatic surgeries. Sagittal splitting osteotomy (Obwegeser-Dal Pont's method) has been carried out on 89.4 % of the patients. Two jaw surgery (upper and lower jaws) were made on 4 patients.
Autopreserved blood reinfusion, induced hypotension and osteosynthesis between splitted bone segments with miniplate have been used since 1986, 1987 and 1988, respectively.
Induced hypotension was considered to be useful to reduce operation time and blood loss. It seems that fixation of the devided bone segments with miniplates has a greater advantage for reduction of postoperative relapse of the mandible than ligatures with wire.