A Survey of Orthognathic Surgeries in the Kyoto Oral Health Care Center, Rakuwakai Otowa Hospital in Last Six Years

A survey was conducted on 516 cases of orthognathic surgery at Kyoto Oral Health Care Center, Rakuwakai Otowa Hospital from 2002 to 2008.The results were as follows:1.The total number of patients was 516 cases, approximately 40.2% of the total number of inpatients. The annual number of operations has markedly increased since 2002.2. The male-female ratio was 1: 3.0.3. The mean age was 25.8±7.6 years old.4.The most predominant diagnosis was mandibular prognathism (33.9%).5. Intraoral vertical ramus osteotomy (IVRO) only was performed in 18.2% of all cases, while sagittal split ramus osteotomy (SSRO) only was performed in 14.5%.6. The mean operation time and blood loss in IVRO were 2 hr and 6 min and 71 g, and those in SSRO were 2 hr and 37 min and 157 g.7. Osteosynthesis of bone fragments in SSRO was carried out with plate fixation by an intraoral system.8. The mean duration of hospitalization was 6.7 days.9. The introduction rate was 96.4%. The number of participating orthodontic dental clinics was 30.