The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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In vitro physical, chemical, and biological evaluation of commercially available metal orthodontic brackets

  • Kim, Joo Hyoung (GIO Dental Clinic) ;
  • Cha, Jung Yul (Department of Orthodontics, College of Dentistry, Institute of Craniofacial Deformity, Yonsei University) ;
  • Hwang, Chung Ju (Department of Orthodontics, College of Dentistry, Institute of Craniofacial Deformity, Yonsei University)
  • Received : 2012.04.21
  • Accepted : 2012.08.02
  • Published : 2012.12.25
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Abstract

Objective: This in vitro study was undertaken to evaluate the physical, chemical, and biological properties of commercially available metal orthodontic brackets in South Korea, because national standards for these products are lacking. Methods: Four bracket brands were tested for dimensional accuracy, (manufacturing errors in angulation and torque), cytotoxicity, composition, elution, and corrosion: Archist (Daeseung Medical), Victory (3M Unitek), Kosaka (Tomy), and Confidence (Shinye Odontology Materials). Results: The tested rackets showed no significant differences in manufacturing errors in angulation, but Confidence brackets showed a significant difference in manufacturing errors in torque. None of the brackets were cytotoxic to mouse fibroblasts. The metal ion components did not show a regular increasing or decreasing trend of elution over time, but the volume of the total eluted metal ions increased: Archist brackets had the maximal Cr elution and Confidence brackets appeared to have the largest volume of total eluted metal ions because of excessive Ni elution. Confidence brackets showed the lowest corrosion resistance during potentiodynamic polarization. Conclusions: The results of this study could potentially be applied in establishing national standards for metal orthodontic brackets and in evaluating commercially available products.

Keywords

Acknowledgement

Supported by : Food & Drug Administration

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