A fundamental study on the water durability of mechanical bonding of orthodontic brackets to tooth structure

DOI 19 References
  • TANAKA Shigeru
    Department of Orthodontics, Iwate Medical University School of Dentistry
  • ARAKI Yoshima
    Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry
  • MIURA Hiroyuki
    Department of Orthodontics, Iwate Medical University School of Dentistry

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Other Title
  • 機械的維持力による矯正ブラケットの接着耐久性に関する基礎的研究

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Abstract

To develope an orthodontic direct bonding system capable of debonding the brackets at the bracket-resin interface or in the resin layer, the adhesion strength of bovine enamel to stainless steel rod and its durability were evaluated using the mixture of the adhesive resin containing 4-META (Super bond C & B, Sun Medical) and the hydrophillic orthodontic resin (Enlight, Ormco) as an adhesive. Prior to bonding, tooth surfaces were acid-etched and stainless steel surfaces were polished (NP), roughed by sandblasting (NS) and welded with stainless steel mesh also roughed by sandblasting (MS). Measurements of the bond strength and SEM observations of the bond failure interface were performed for their butt-jointed specimens after water immersion at 37°C.<BR>As the results, initial bond strength for NP was drastically decreased by water immersion for 24 hours, and the bond failure occurred at the stainless steel surface. On the other hand, the bond strength for NS and MS were maintained after 4 week water immersion, and the bond failures were cohesive of the adhesive. That is, this adhesive has enough bond durability to enamel, but poor to a smooth stainless steel surface due to the water penetration through the adhesive layer and tooth structure. These results suggested the failurewould happen at the resin-stainless interface with less damages of tooth-resin interface when debonding the brackets.

Journal

  • Adhesive Dentistry

    Adhesive Dentistry 21 (3), 175-185, 2003

    Japan Society for Adhesive Dentistry

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