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      Ⅱ급1류 부정교합 치료시 제1소구치 발거가 골격치성요소의 변화에 미치는 영향 = Effect of 1st Bicuspids Extraction in Treatment of Class Ⅱ Division 1 Malocclusion on the Skeletodental Factors

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      https://www.riss.kr/link?id=A19634770

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      The purpose of this study was to evaluate the changes of skeletodental factors in Class Ⅱ, division 1 malocclusion, following treatment with or without the extraction of four first premolars. one hundred and one treated cases were devided into four ...

      The purpose of this study was to evaluate the changes of skeletodental factors in Class Ⅱ, division 1 malocclusion, following treatment with or without the extraction of four first premolars. one hundred and one treated cases were devided into four groups by sex and treatment type.
      Various skeletodental and facial factors in pre and post-treatment lateral cephalograms and study models were measured and compared by Students' t-test.
      The results were as follows;
      1. There was a facial height reduction in extraction group.
      2. Extraction treatment was more effective in retraction of upper incisors and lips.
      3. Lower incisors were titled lingually in extraction group, but labially in nonextraction group.
      4. Maxillary space deficiency was resolved by lateral maxillary expansion in nonextraction group.

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