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A statistical survey of orthognathic surgery was per­ formed on the cases for the last 12 years, from 2000 to 2011, in the Department of Maxillofacial Surgery, Tokyo Medical and Dental University. 1. The number of orthodontic surgery cases was 577, with 257 males and 320 females. 2. The mean age at surgery was 25.4±6.2 years old. Patients in their teens and twenties accounted for 77.7% of the subjects. 3. The most common clinical diagnosis was mandibular prognathism without other condition, accounting for 53.8%. Mandibular prognathism with and without other conditions accounted for 88.0%. 4. The most common bone fixation until 2008 was screw­fixation, accounting for about 70% of the cases in a year. Miniplate fixation increased from 2009, to 79.1% of the cases in 2011. 5. The most common surgical method was sagittal split ramus osteotomy (SSRO), accounting for 80% of the cases in 2000. The combination of Le Fort I osteotomy and SSRO has been increasing. 6. The average operation time was 212.3±70.8 minutes and the amount of bleeding was 337.2±371.2ml in SSRO, and 358.5±87.5 minutes and 692.9±442.7ml respectively in the combination of Le Fort I osteotomy and SSRO. 7. The average duration of hospital stay was over 20 days in 2000, but 12 days in 2011.

Clinical Outcome of Orthognathic Surgery for the Last 12 Years in the Department of Maxillofacial Surgery, Tokyo Medical and Dental University