The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Changes in frictional resistance between stainless steel bracket and various orthodontic wires according to a change in moment

모멘트 변화에 따른 브라켓과 교정용 선재 사이의 마찰력 변화

  • Jeong, Hye-Jin (Department of Orthodontics, School of Dentistry, Chosun University) ;
  • Kim, Kwang-Won (Department of Orthodontics, School of Dentistry, Chosun University) ;
  • Lim, Sung-Hoon (Department of Orthodontics, School of Dentistry, Chosun University)
  • 정혜진 (조선대학교 치과대학 교정학교실) ;
  • 김광원 (조선대학교 치과대학 교정학교실) ;
  • 임성훈 (조선대학교 치과대학 교정학교실)
  • Published : 2007.04.30
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Abstract

Objective: The purpose of this study was to compare changes in frictional resistance between the bracket and wire under dry and wet conditions according to a change in moment. Methods: A stainless steel bracket of $0.022"{\times}0.028"$ slot, and $0.019"{\times}0.025"$ stainless steel, beta-titanium, and nickel-titanium wires were used. A 10 mm length lever was attached to the test (sliding) brackets to generate a moment. The experimental model was designed to allow tipping until contacts were established between the wire and the mesiodistal edges of the bracket slot. The moment was generated by suspending a 100 g or 200 g weight on the end of the lever. The moments applied were $1000g{\cdot}mm\;(100g{\times}10mm)\;and\;2000g{\cdot}mm\;(200g{\times}10mm)$. The test brackets were ligated with elastomeric ligature for a constant ligation force and the fixed brackets were ligated with stainless steel ligature. Brackets were moved along the wire by means of an universal testing machine, and maximum frictional resistances were recorded. Results: Stainless steel wire showed least frictional resistance and there was no significant difference between beta-titanium and nickel-titanium except at $2000g{\cdot}mm$ moment in wet conditions. Frictional resistance of all wires increased as the moment increased from $1000g{\cdot}mm\;to\;2000g{\cdot}mm$. Under wet conditions, the frictional resistance of stainless steel wires increased in both $1000g{\cdot}mm\;and\;2000g{\cdot}mm$ moment conditions, but frictional resistance of nickel-titanium and beta-titanium increased only in $2000g{\cdot}mm$ conditions. Conclusion: These results indicated that various conditions influence on frictional resistance. Therefore, laboratory studies of frictional resistance should simulate clinical situation.

본 연구의 목적은 모멘트 변화에 따른 건조 환경과 타액 환경에서의 스테인리스강 브라켓과 여러 종류의 교정용 선재 사이의 마찰력을 비교하는 것이었다. 실험에는 $0.022"{\times}0.028"$ 스테인리스강 브라켓과 $0.019"{\times}0.025"$ 스테인리스강, 베타-티타늄, 니켈-티타늄 선재가 사용되었다. 활주 이동될 브라켓에는 0.9 mm 직경의 스테인리스강 선재로 제작된 길이 10 mm의 레버를 부착하였으며 레버에 100 g, 200 g의 추를 부착함으로써 브라켓에 각각 $1000g{\cdot}mm$ $(100g{\times}10mm)$, $2000g{\cdot}mm$ $(200g{\times}10mm)$의 모멘트를 가하고 만능시험기를 이용하여 마찰력을 측정하였다. 모든 조건에서 스테인리스강 선재가 가장 작은 마찰력을 보였으며 베타-티타늄과 니켈-티타늄 선재 사이에서는 $2000g{\cdot}mm$ 모멘트의 인공타액 하의 조건에서를 제외하고는 마찰력의 유의한 차이가 없었다 모든 선재에서 모멘트가 $1000g{\cdot}mm$인 때보다 $2000g{\cdot}mm$일 때 마찰력이 더 컸다. 건조 환경과 타액 환경의 비교에 있어서 $1000g{\cdot}mm$의 모멘트 하에서 인공타액에 의해 스테인리스강 선재의 마찰력은 증가하였으나 베타-티타늄과 니켈-티타늄의 마찰력은 증가하지 않았으며, $2000g{\cdot}mm$의 모멘트 하에서 인공타액에 의해 모든 종류의 선재에서 마찰력이 증가하였다.

Keywords

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