A survey of orthognathic surgery in the past 16 years from 2000 to 2015, in the Department of Oral and Maxillofacial Surgery/Orthodontics, Yokohama City University Medical Center, was performed.
The results were as follows:
1. In the past 16 years, 798 patients with dentofacial deformities underwent orthognathic surgery. In the last 5 years, the average number of patients was 72.8 per year.
2. There were 247 male and 551 female patients (ratio 1：2.2).
3. The mean age at surgery was 26.6 years old.
4. The most common clinical diagnosis was mandibular protrusion without other conditions, accounting for 38.7% of the patients. Mandibular protrusion with asymmetry and asymmetry without other conditions accounted for 16.8% and 12.0%, respectively.
5. The most common surgical procedure was the combination of Le Fort I osteotomy and sagittal split ramus osteotomy (SSRO), accounting for 59.3%. SSRO accounted for only 23.7%.
