하악 제2대구치의 발치후 제3대구치의 변화에 관한 연구

• 영문명: THIRD MOLAR CHANGES FOLLOWING LOWER SECOND MOLAR EXTRACTIONS
• 발행기관: 대한치과교정학회
• 저자명: 홍순창(Soon Chang Hong) 유영규(Young Kyu Ryu)
• 간행물 정보: 『The Korean Journal of Orthodontics』제17권 제2호, 321~333쪽, 전체 13쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1987.12.31

영문 초록

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.