A survey over a 9-year period from 2005 to 2013 was performed on orthognathic surgery at the Maxillofacial Unit of Oita Oka Hospital.
The results were as follows:
1. The total number of cases of patients who underwent orthognathic surgery under general anesthesia was 394. The annual number of operations has markedly increased since 2005.
2. The male-female ratio was 1: 2.6.
3. The mean age (standard deviation) was 24.5 (8.3) years old.
4. The most predominant diagnosis was mandibular protrusion (60.9% of the cases).
5. Sagittal split ramus osteotomy (SSRO) alone was performed in 79.4% of the cases.
6. The mean operation time and blood loss were 68min (34-305min) and 100ml (10-971ml) in SSRO, 149min (97-276min) and 149ml (10-540ml) in LF-1+SSRO, respectively.
7. The mean duration of hospitalization was 9 days.
8. The introduction rate was 84.1%. The number of participating orthodontic clinics was 23.
