Clinico-statistical Observations on 305 Patients(314 Cases) Undergoing Orthognathic Surgery.

概要

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A clinico-statistical observation was carried out on 305 patients (314 cases) who underwent orthognathic surgery between 1981 and 1994 at Second Department of Oral and Maxillofacial Surgery, Showa University Dental Hospital. The results were as follows: 1. The number of patients with jaw deformity has increased in recent years. The average number of patients per year was 22, about 12.4% of the total number of inpatients. 2. The age of patients ranged from 15 to 40 years with a mean of 22.3 years. 3. The patients were 85 males and 220 females, and the male-female ratio was 1: 2.6. 4. The most frequent chief complaint was malocclusion. 5. Of these patients, 272 cases (89.2%) had mandibular prognathism with or without another jaw deformity. 6. Sagittal splitting ramus osteotomy (SSRO) was performed on 266 cases (84.8%). 7. The average operation time and blood loss in SSRO were 4hr. 25min.±1hr. 2min. and 471.7ml±339.1ml, respectively. 8. Osteosynthesis of bone fragments in SSRO was carried out as follows: 36 cases with circumferential wiring, 16 cases with sapphire lag screw, 161 cases with two-dimensional positioning screw, 13 cases with three-dimensional positioning screw, and 40 cases with mini-plate fixation.
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