Abstract
In order to clarify the trend of patients undergoing surgical orthodontic treatment over the past decade at the Clinic of Orthodontics of Meikai University Hospital, a statistical analysis was performed. The general information, skeletal pattern and occlusion were examined.
The results were as follows:
1. A total of 208 cases underwent surgical orthodontic treatment. There was a gradual annual increase in the number of patients. The numbers of male and female patients were 63 (30.6%) and 145 (69.4%), respectively. The average age at the initial visit and orthognathic surgery were 21.3 and 24.1 years old, respectively. 97.6% of patients lived in Saitama prefecture where Meikai University Hospital is located. The chief complaints were facial deformity (79.3%) and occlusion (17.8%).
2. Skeletal Class I, II and III cases accounted for 14.9%, 8.7% and 76.4%, respectively. Skeletal Class III cases were divided into two groups according to whether sagittal split ramus osteotomy (SSRO) and/or intraoral vertical ramus osteotomy (IVRO) was performed (one-jaw group), or two-jaw surgery was performed (two-jaw group). Comparing the one- and two-jaw surgery groups, ANB angle was significantly smaller in the latter than the former, but there was no significant difference in Frankfort mandibular plane angle (FMA) between the two groups.
3. Patients undergoing SSRO solely accounted for 56.7%, followed by SSRO and Le Fort I osteotomy (17.3%), IVRO solely (8.7%), SSRO and IVRO (8.2%), Wassmund osteotomy solely (3.9%), and Wassmund osteotomy and SSRO (1.4%).
4. Female skeletal Class III patients tended to seek orthognathic treatment even if their intermaxillary discrepancy was mild.
5. 74.1% and 76.7% of the one- and two-jaw surgery groups, respectively, underwent first premolar extraction.
