The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Elastic force degradation of synthetic elastomeric chain

체인형 합성고무탄성재의 탄성력 감쇄

  • HEO, Chang-Hyuck (Department of Orthodontics, College of Dentistry, Kyungpook National University) ;
  • SUNG, Jae-Hyun (Department of Orthodontics, College of Dentistry, Kyungpook National University) ;
  • KWON, Oh-Won (Department of Orthodontics, College of Dentistry, Kyungpook National University) ;
  • KYUNG, Hee-Moon (Department of Orthodontics, College of Dentistry, Kyungpook National University)
  • 허창혁 (경북대학교 치과대학 교정학교실) ;
  • 성재현 (경북대학교 치과대학 교정학교실) ;
  • 권오원 (경북대학교 치과대학 교정학교실) ;
  • 경희문 (경북대학교 치과대학 교정학교실)
  • Published : 2003.10.01
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Abstract

The purpose of this study was to evaluate the force degradation rate of synthetic elastomeric chains during space closing phase of orthodontic treatment. Two kinds of synthetic elastomeric chains(RMO, 3M) were selected which were commonly used In clinics. All of the samples were extended and tested for 4 weeks under the simulated intraoral condition. The results can be summarized as follows : 1. Time related residual force showed typical logarithm function. Residual force after 4 weeks was $41.2\~64.6\%$ of original force, and difference between two kinds of elastomeric chain existed. 2. Elastic force decreased greatly during first 10 minutes, so $20\~25\%$ of original force disappeared. After that, this decreasing tendency was diminished significantly, average rate of elastic force after 1 week to 4 weeks were $1.5\%$ demonstrating rather constant force. 3. Even though the same brand of elastomeric chiain was used, as extension rate of elastomeric chain increased, force degradation rate increased by decreasing of residual force.

본 연구는 체인형 합성고무탄성재의 시간에 따른 탄성력 감쇄의 양상을 평가하여, 이들 재료의 임상적용시 적절한 교정력의 적용을 위해 참고가 될 만한 기준을 구해보려는 목적으로 시행되었다. 공간폐쇄시 사용되는 체인형 합성고무탄성재의 탄성감쇄정도를 알아보기 위하여, 임상에 널리 사용되는 두 가지의 체인형 합성고무탄성재를 구강내 상태와 유사한 조건하에서 4주간 신장시켜 관찰한 결과 다음과 같이 요약할 수 있었다. 1. 시간에 따른 탄성력 감쇄양상은 전형적인 log함수의 형태를 보이며, 4주후 잔존탄성력은 원래의 $41.2\~64.6\%$이며 제품에 따라 차이가 있었다. 2. 신장후 초기 10분 동안 탄성력의 급격한 감소를 보여서, 초기힘의 $20\~25\%$를 상실하였으며, 이후 감소량이 줄어들어 1주이후부터 4주까지의 평균감소량은 $1.5\%$정도로 거의 일정한 힘의 크기를 보여주었다. 3. 동일한 재료를 사용하더라도, 탄성재의 신장량이 증가할수록 잔존탄성력이 감소하여 탄성감쇄율이 증가하였다

Keywords

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