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Abstract

Introduction: This in vitro study evaluates the home bleaching treatment effect on the surface corrosion of stainless steel orthodontic brackets. Materials and Methods: Three types of brackets, 3M Unitek (U), Dentaurum (D) and Tomy (T), were immersed in either one of six bleaching treatments at 37 ℃ for 28 days. After immersion, the amounts of iron, chromium, and nickel ions released from the brackets were detected using inductively coupled plasma mass spectrometry (ICP-MS). A scanning electron microscope and an atomic force microscope were used to analyze the surface morphology and roughness, respectively. Two-way ANOVA and Tukey’s post-hoc, α = 0.05, were used to analyze the test data for different brackets and bleaching treatments. Results: The bleaching treatment and bracket brand had a statistically significant influence on metal ion release (p<0.01). Among the tested brackets treated with 10% H2O2, the Tomy bracket had the highest iron and nickel ion released while the 3M Unitek bracket had the highest chromium ion released. Conclusion: These findings suggest that using home bleaching agents on stainless steel brackets could result in metal ions release, especially Nickel ions. However, the amount of released nickel ions was still below the critical value for inducing a negative biological effect.

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