The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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THIRD MOLAR CHANGES FOLLOWING LOWER SECOND MOLAR EXTRACTIONS

하악 제2대구치의 발치후 제3대구치의 변화에 관한 연구

  • Hong, Soon Chang (Dept of Orthodontics, College of Dentistry, Yonsei University) ;
  • Ryu, Young Kyu (Dept of Orthodontics, College of Dentistry, Yonsei University)
  • 홍순창 (연세대학교 치과대학 교정학교실) ;
  • 유영규 (연세대학교 치과대학 교정학교실)
  • Published : 1987.09.30
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Abstract

The purpose of this study was to observe the changes of the lower 3rd molars following the extraction of the lower 2nd molars by Lateral Cephalograms and Orthopantomograms. The subjects consisted of twenty malocclusion, 7 males 13 females, were 19 year 5 month old at the removal of the lower 2nd molars, 19 year 1 month old at the end of the orthodontic supervision after the removal of the lower 2nd molars (mean age) The obtained results were as follows, 1 It is recommended to extract the lower 2nd molars when the lower 3rd molars are Nolla's Stage 4 or 5 2 With the pre-extraction variables obtained by factor analysis, it was possible to predict the long axis of the lower 3rd molars after 2nd molar extraction. 3 There were no impacted 3rd molars.

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