2018 Volume 28 Issue 1 Pages 28-33
A statistical analysis was performed for patients who underwent orthognathic surgery during the last 12 years, from 2005 to 2016, in the Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Tokyo Medical University.
The results were as follows:
1．The number of orthognathic surgery operations increased yearly.
2．There were 313 patients （109 males and 204 females） in the 12 years.
3．The average age of the patients was 29.0 years old （range: 16-58）. Patients in their twenties accounted for the largest number （47.9％）.
4．The most common diagnosis was mandibular prognathism （50.5％）, followed by mandibular retrognathism （11.8％）, and mandibular prognathism with open bite （9.3％）.
5．The most frequently performed operation was sagittal split ramus osteotomy （SSRO）, accounting for 47.9％, followed by the combination of Le Fort I osteotomy and SSRO （L1＋SSRO） at 27.5％.
6．The average operation time and amount of bleeding for SSRO were 231 minutes and 316ml, and those for L1＋SSRO were 408min and 810ml, respectively.
7．The number of clinics referring patients to our department is increasing.
