Abstract
A clinical survey was performed on 252 patients who underwent orthognathic surgery at the Department of Oral and Maxillofacial Surgery, Chubu Rosai Hospital, during the 7 years from April 1, 2017 to December 31, 2023. The results were as follows.
1．During the 7 years, 252 patients （74 males and 178 females） with dentofacial deformities underwent orthognathic surgery.
2．The average age of the patients was 27.7±7.4 years old （16-57）. Patients in their twenties accounted for the largest number （53.6％）.
3．The most common diagnosis was mandibular asymmetry＋mandibular prognathism （25.8％）, followed by mandibular prognathism （21.0％）.
4．The most frequently performed operation was sagittal split ramus osteotomy （SSRO）, accounting for 133 cases （52.8％）, followed by the combination of Le Fort Ⅰ osteotomy and SSRO （LF1＋SSRO） with 55 cases （21.8％）.
5．The average operation time and amount of bleeding for SSRO were 209±38 minutes and 130±121mL, and those for LF1＋SSRO were 366±85 minutes and 336±244mL, respectively.
6．The mean hospital stay was 11±3.0 days in SSRO and 15±3.8 days in LF1＋SSRO.
7．The number of clinics referring patients to our department increased yearly.
8．The most common intraoperative and postoperative complications were inferior alveolar nerve palsy with 65 cases （25.8％） and postoperative nausea with 65 cases （25.8％）.
