The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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AN EXPERIMENTAL STUDY ON THE CYTOTOXICITY OF RECYCLED BRACKETS

재생방법에 따른 교정용 브라켓의 세포독성에 관한 실험적 연구

  • Lim, Young-Kyu (Department of Orthodontics, College of Dentistry, Seoul National University) ;
  • Yang, Won-Sik (Department of Orthodontics, College of Dentistry, Seoul National University)
  • 임용규 (서울대학교 대학원 치의학과 치과교정학) ;
  • 양원식 (서울대학교 치과대학 치과교정학교실)
  • Published : 1993.06.01
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Abstract

The purpose of this stuy was to evaluated the cytotoxicity of brackets which were recycled thermally or chemically. New brackets and used brackets which had been in mouth for at least 2years were used as samples and human gingival cell culture and agar overlay technique was used to evaluate the cytotoxicity. From the experiment the following results were obtained : 1. New brackets in the as received state showed mild cytotoxicity. 2. Thermally recycled brackets except the used bracket not electropolished showed moderate cytotoxicity and among them new brackets showed greater cytotoxicity than used ones. 3. Used brackets which were thermally recycled without electropolishing showed mild cytotoxicity. 4. Among thermally recycled brackets, electropolished brackets showed greater cytotoxicity than not electro-polished ones. 5. Chemically recycled brackets showed moderate cytotoxicity, and among them, new brackets appeared to be more cytotoxic than used ones.

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