The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Changes in lip and periornl soft tissue after bracket removal

브라켓 제거에 따른 입술과 주위 연조직의 변화

  • Lee, Jeong-Sub (Department of Dentistry, Wonju Christian Hospital, Yonsei University) ;
  • Choy, Kwang-Chul (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Park, Young-Chel (Oral Science Research Center, Craniofacial Deformity Research Center, Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Kim, Kyung-Ho (Oral Science Research Center, Craniofacial Deformity Research Center, Department of Orthodontics, College of Dentistry, Yonsei University)
  • 이정섭 (연세대학교 원주의과대학 치의학교실 교정과) ;
  • 최광철 (연세대학교 치과대학 교정학교실) ;
  • 박영철 (연세대학교 치과대학 교정학교실, 구강과학연구소, 두개안면기형 연구소) ;
  • 김경호 (연세대학교 치과대학 교정학교실, 구강과학연구소, 두개안면기형 연구소)
  • Published : 2007.04.30
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Abstract

Objective: Soft tissue changes due to orthodontic treatment has large individual variation. Therefore continuous evaluation during treatment is required. Patients with fixed orthodontic appliances often wonder if their lip positions will change after the removal of brackets, but only a few studies exist on this topic. The objective of this study was to evaluate the changes of the lips and perioral soft tissue after bracket removal. Methods: The sample used in this study was 19 males and 33 females. Cephalometric X-rays were taken at 3 stages - T1 (before debonding), T2 (just after debonding), T3 (1.5 months after debonding). Results: The lower lip was retruded immediately after debonding (T2-T1), and 1.5 months after debonding (T3-T2). The mean amounts of retrusion from the vertical reference plane (sG perpendicular line) were about 0.38 mm for the upper lip and 0.88 mm for the lower lip. Immediately after debonding, lip retrusion of females was greater than that of males. During the post-debonding period, lower lip of males was retruded more than that of females. Conclusion: Lips are retruded after bracket removal, and there is no gender difference 1.5 months after debonding.

교정치료에 따른 연조직 변화 양상은 개개인의 차이가 심하므로 교정치료 중 흔히 재평가가 필요하다. 이를 위해서 고정식 교정장치가 부착되어 있는 상태의 입술의 위치와 교정치료 종료 후의 위치에 대한 비교 예측이 필요하다. 이 연구는 교정치료가 종료되어 고정식 교정장치를 제거하는 52명을 대상으로 T1(장치제거 전), T2(장치제거 직후), T3(장치제거 1.5개월 후)의 측모두부방사선사진상에서 입술과 그 주위 연조직을 분석한 결과 다음과 같은 결론을 얻었다. 장치제거 직후(T2-T1) 하순이 후퇴하며 장치제거 직후부터 1.5개월 후 (T3-T2)까지도 계속 후퇴하였다. 장치제거 1.5개월 후 (T3-T1), 기준선(G-perpendicular line)에 대한 입술의 평균 후퇴양은 상순(Ls)에서 0.38mm, 하순(Li)은 0.88 mm를 보였다. 주로 장치제거 직후(T2-T1)에 하순이 후퇴하는 여자군과 달리 남자군은 장치제거 직후부터 1.5개월 후(T3-T2)가지 하순이 주로 후퇴하는 양상을 보였으나, 장치제거 1.5개월 후 (T3-T1)에는 남자군과 여자군간의 뚜렷한 차이를 보이지 않았다.

Keywords

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