Korean J Orthod.  1983 Mar;13(1):63-72.

A study of types and distribution of patients in the department of orthodontics, infirmary of dental college, Y-university

• Oh YJ
• Ryu YK

Abstract

The author was to study the types and distrbution 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 persions(32.5%) were due to the undergrowth of the mandible, and deep bith 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 the 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 time then that of male. 6. In the age distrbution of the patientsm 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.

MeSH Terms

Crowding
Female
Humans
Male
Malocclusion
Mandible
Open Bite
Orthodontics*