Clinical Study of Jaw Deformity Patients in Osaka Dental University Hospital

Abstract

A clinical statistical study was carried out on surgical correction of jaw deformation in patients who visited Osaka Dental University.
1) The annual number of the new patients with jaw deformation slightly increased. A marked increase was observed after 1990.
2) The male/female ratio in the new patients was about 1: 2.
3) The mean age at the time of initial consultation was 20.4 years for males and 20.3 years for females.
4) According to age groups, the number of patients aged 16-20 years accounted for 47.6% and that of patients aged 21-25 years for 30% of all patients.
5) Concerning area distribution in the new patients, Osaka prefecture accounted for the highest percentage (71%), followed in order by Hyogo, Nara, and Oyoto prefectures.
6) According to the type of jaw deformation, skeletal mandibular protrusion accounted for the highest percentage (84%).