Abstract
A total of 1,337 patients underwent orthognathic surgery and evaluation for dentofacial deformity during the past 27 years from April 1991 to March 2018, in the Department of Oral and Maxillofacial Surgery, Fukuoka Dental College Medical and Dental Hospital.
The results were as follows:
1．The average number of orthodontic surgery cases was 49.5±14.4.
2．The patients were 351 males and 986 females, and the ratio of males to females was about 1 : 2.8.
3．Maxillary retrognathism＋Mandibular prognathism was the most clinical diagnosis with 282 cases（21.2％）, followed by mandibular prognathism with 217（16.2％）, and facial asymmetry with 150（11.2％）.
4．The average age of the patients was 25.1±1.5 years old（range : 14-65）, and has been rising gradually.
5．Le Fort I osteotomy（L1）＋Sagittal split ramus osteotomy（SSRO）was performed for most cases（702 cases. 52.5％）.
6．The average operation time and amount of bleeding in L1＋SSRO were 241.5±55.8 minutes and 552.1±247.1ml, respectively. Those in SSRO were 157.5±35.0 minutes and 159.9±84.2ml, respectively.
7．The duration of intermaxillary fixation is almost 5 days in recent years.
8．Hospitalization period was 27.3±2.6 days by the end of fiscal 2003. The time taken to provide a critical path, that has been 18.2±1.5 days for L1＋SSRO cases and 16.4±1.3 days for SSRO cases.
9．475 patients came from our orthodontic clinics and 655 were referred from other clinics.
