The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A comparison of on masse retraction of six anterior teeth with separate canine retraction

6전치 일괄(on masse) 견인과 견치 견인 후 4전치 견인 시 공간폐쇄 양상에 관한 연구

  • Heo, Wook (Department of Orthodontics, College of Dentistry, Seoul National University) ;
  • Nahm, Dong-Seok (Department of Orthodontics, College of Dentistry, Seoul National University)
  • 허욱 (서울대학교 치과대학 교정학교실) ;
  • 남동석 (서울대학교 치과대학 교정학교실)
  • Published : 2002.06.01
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Abstract

The purpose of this study was to compare on masse retraction of six anterior teeth with separate canine retraction in the amount of the anchorage loss and the retraction of the anterior teeth. The subjects consisted of 30 adult female patients with Angle Class 1 malocclusions who were treated by .022' straight wire appliance with 4 first permolar extraction. They were composed of two groups. Group 1 consisted of 15 subjects, whose six anterior teeth were retracted by on masse retraction. Group 2 consisted of 15 subjects, whose canines were retracted separately. Pre-treatment and post-treatment lateral cephalometric radiographs were analyzed. All data were processed statistically with independent samples t-test, and the conclusions were as follows. 1. There was no significant difference in the amount of the anchorage loss between two groups(p>0.05). 2. There was no significant difference in the amount of the retraction of the anterior teeth between two groups(p>0.05). 3. There was a significant difference in the amount of the inclinational change of the upper incisors between two groups. It was greater in Group 2. 4. There was a significant difference in the vertical positional change of the upper incisal edges between two groups. The upper incisal edges in Group 2 were more extruded than Group 1 by about 1mm. 5. There was no significant difference in the vertical positional change of the root apex of the upper incisors between two groups(p>0.05). And there was no significant difference in the vertical positional change of the upper molar(p>0.05).

본 연구의 목적은 상하악 제 1소구치를 발거하고, 6전치 일괄(en masse)견인과, 견치 견인 후 4전치 견인 시, 구치부의 고정원 소실과 전치부의 후방이동량, 치축변화량, 전치부와 구치부의 수직적변화에 대해 비교하는 것이다. 만 17세 이상의 성인 여자이며, 1급 구치 관계이고, 상하악 밀생(crowding)이 각각 4mm이하인 전돌(protrusion) 환자이며, 상하악 제 1소구치를 발거하고 .022" straight wire appliance로 치료하였으며, TPA를 사용하지 않았고, head gear와 같은 구외고정원을 사용하지 않은 총 30명의 환자를 대상으로 하였다. 그중 6전치 일괄(on masse) 견인을 시행한 제 1군 15명과 견치 견인 후4전치 견인을 시행한 제 2군 15명에 대해, 치료전후의 두부방사선 계측사진을 투사하여 비교 분석하였다. 각 군에 대한 치료 전 후의 변화를 independent samples t-test를 이용하여 통계처리 하였으며, 다음과 같은 결론을 얻었다. 1. 두 군에서 구치부의 고정원 소실량에는 차이가 없었다. 2. 두 군에서 전치부의 후방이동량에는 차이가 없었다. 3. 두 군에서 전치부의 치축변화량은 제 2군에서 다소 컸다. 4. 두 군에서 전치부 절단연의 수직적 변화는, 제 2군에서 약 1mm 정도의 정출이 더 나타났다. 5. 두 군에서 전치부 치근첨과 구치부의 수직적 변화에는 차이가 없었다.

Keywords

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