The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A STUDY ON THE FREQUENCY OF TOOTH EXTRACT10N FOR ORTHODONTIC TREATMENT

교정치료를 위한 발치빈도에 관한 연구

  • Cho, Kju-Young (Department of Orthodontics, College of Dentistry, Chosun National University) ;
  • Lee, Dong-Joo (Department of Orthodontics, College of Dentistry, Chosun National University)
  • 조규영 (조선대학교 치과대학 교정학교실) ;
  • 이동주 (조선대학교 치과대학 교정학교실)
  • Published : 1988.03.01
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Abstract

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. Thefollowingresultswereobtained. 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.

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