矯正治療를 爲한 拔齒頻度에 關한 硏究

A study on the frequency of tooth extraction for orthodontic treatment

To study diagnosis and treatment plan of malocclusion, comparison of race and nation and consideration of treatment technique, 885 orthodontic patients of the department of orthodontics, Infirmary of dental college, Chosun University were evaluated. The frequency and pattern of tooth extraction were studied according to malocclusion types and developmental stages of occlusion and sex. The following results were obtained. 1. Average frequency of tooth extraction for orthodontic treatment was 38.3%. 2. The frequency of tooth extraction was 43.7% in class I malocclusion, 34.2% in class II malocclusion and 32.1 % in class III malocclusion. 3. The drequency of tooth extraction was the highest in permanent dentition (49.2%). 4. The frequency of tooth extraction was not different between male and female. 5. The frequency of 3-4 premolars extraction was the highest (57.5%) and that of lower incisor extraction was the lowest (2.9%) in patterns of tooth extraction. 6. Both frequency of unilateral and single arch extraction were the highest in class III malocclusion.