Y대학교 부속병원 교정과에 내원한 부정교합 환자의 분류 및 분포에 관한 연구

A STUDY OF TYPES AND DISTRIBUTION OF PATIENTS IN THE DEPARTMENT OF ORTHODONTICS, INFIRMARY OF DENTAL COLLEGE, Y-UNIVERSITY

The author was to study the types and distribution of malocclusion in the 1217 patients with diagnostic charts, cephalograms and study models, who have been treated from March, 1973 to August, 1982 in the Department of orthodontics, Infirmary of Dental College, Yon Sei University. The results were as follows; 1. In the Angle's classification of malocclusion, it was presented that class I malocclusion was 671 persons $(55.1\%)$, class II division 1 malocclusion was 241 persons $(19.8\%)$, class II division 2 malocclusion was 30 persons $(2.5\%)$ and class III malocclusion was 275 persons $(22.6\%)$. 2. In the Angle's class I malocclusion, the crowding was most remarkable $(39\%)$ 3. In the Angle's class II malocclusion, 88 persons $(32.5\%)$ were due to the undergrowth of the mandible, and deep bite was most frequent. 4. In the Angle's class II malocclusion, 94 persons $(34.2\%)$ were .in the pseudo type, 84 persons $(29.8\%)$ were due to the overgrowth of the mandible, and openbite and edge to edge bite were most frequent. 5. In the sexual distribution of the patients, female patients were 791 persons $(65\%)$, male patients were 426 persons $(35\%)$, and the number of females was 1.8 times than that of males. 6. In the age distribution of the patients, 572 persons $(47\%)$ were in the 9-13 years old. 7. In the regional distribution of the patients, most of them lived near the hospital.