Abstract
We evaluated statistically the status of orthognathic surgery in our department between 2013 and 2018.
The results were as follows:
1．The number of orthognathic surgery operations increased yearly.
2．There were 194 patients （47 males and 147 females） in the 6 years.
3．The mean age at the time of operation was 24.7±7.8 years old （range: 15-55）. Patients in their twenties accounted for the largest number （39.1％）.
4．The most common diagnosis was mandibular protrusion （69.6％）, followed by maxillary retrusion （9.3％） and mandibular retrusion （8.2％）.
5．The most frequently performed operation was sagittal split ramus osteotomy （SSRO）, accounting for 61.3％, followed by the combination of SSRO and Le Fort Ⅰ
osteotomy （SSRO+LF1） at 32.0％.
6．The average operation time and amount of bleeding for SSRO were 165.1 minutes and 129.2ml, and those for SSRO+LF1 were 256.3 minutes and 186.4ml, respectively.
7．The number of orthodontic clinics referring patients to our department is increasing.
