抄録
In this study, we conducted a clinical analysis of 1,239 patients with jaw deformities who had undergone orthognathic surgery at our hospital over the 22 years from January 2001 to December 2022. The participants included 450 male and 789 female patients with a mean age of 26.8 years （range, 13-65 years） at the time of surgery. Various surgical methods are used at our hospital, the two most common being sagittal split ramus osteotomy （SSRO） and combined Le Fort Ⅰ osteotomy with SSRO （LF-1＋SSRO）. The average operative time for SSRO was 188.8min, whereas that for LF-1＋SSRO was 296.7min. The average blood loss after SSRO was 346.1mL, whereas that after LF-1＋SSRO was 325.8mL. Improvements in postoperative stability and facial appearance have become increasingly important. Furthermore, LF-1＋SSRO procedures have become more complex, leading to an increase in average operative time.
