The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A STUDY OF THE ETIOLOGY OF UNILATERAL CLASS II, DIVISION 1 MALOCCLUSION

편측성 II급 1류 부정교합의 교합특성에 관한 연구

  • Lee, Byung-Kook (Department of Orthodontics, Division of Dentistry Kyung Hee University) ;
  • Lee, Ki-Soo (Department of Orthodontics, Division of Dentistry Kyung Hee University)
  • 이병국 (경희대학교 치과대학 교정학교실) ;
  • 이기수 (경희대학교 치과대학 교정학교실)
  • Published : 1988.03.01
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Abstract

The purpose of this study was to verify the class I molar relationship in skeletal class II and class II molar relationship in skeletal clan I malocclusion with unilateral class II, division 1 malocclusion. The sample consisted of lateral cephalometric radiographs and upper and lower dental casts of 30 unilateral class II, division 1 malocclusion. The results of this study were as follows: 1. Skeletal class I malocclusion was $43\%$, and skeletal class II malocclusion was $57\%$ in 30 cases of unilateral class II, division 1 malocclusion. 2. In the skeletal class II with unilateral class II, division 1 malocclusion, mandibular first molar on the class I side showed more mesial migration than the opposite side. 3. In the skeletal class I with unilateral class II, division 1 malocclusion, maxillary first molar on the class II side showed more mesial migration than the opposite side. 4. Midline deviation of upper or lower dental arch was $90\%$ in 30 cases of unilateral class II, division 1 malocclusion.

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