2002 Volume 12 Issue 3 Pages 94-102
A clinical evaluation study was performed on, and a questionnaire was administered to, patients with jaw deformities in the Department of Orthodontics at Asahi University Hospital, from April 1990 to August 2000. The findings were as follows: 1) Numbers of new patients tended to increase annually, with a male: female ratio of 1: 1.5. 2) The age of new patients ranged from 7 to 42 years, with a mean of 19.9 years. 3) Regarding the geographical distribution of new patients, the majority were from Gifu prefecture (81.3%), followed by Aichi (10.0%) and Shiga prefectures (6.0%). 4) Mandibular prognathism was the most frequently (81.6%) observed type of jaw deformity. A rate of 67.5% of the patients demonstrated mandibular protrusion according to Slavicek's classification. and 88.3% were classified as skeletal Class III type according to Sugawara's classification. 5) Missing teeth except for congenital tooth absence or third molar were observed in 24.7% of patients. 6) Prevalence of TMJ disorders was 23.1%. 7) Items were investigated by inclusion in a questionnaire given to 70 patients with jaw deformities (males 15, females, 55; teenagers, 23; those in their 20s, 40; and those in their 30s, 7). Results were as follows: Patients and their families tended to display dentfacial deformity; about 40% of patients had some complex from childhood, and many patients tended to display some habits in childhood.
