| Summary: | 碩士 === 中山醫學大學 === 口腔材料科學研究所 === 95 === This study was to evaluate the effect of home bleaching treatment on metal ions release from stainless steel orthodontic brackets, including 3M Unitek, Dentaurum, and Tomy. Six different bleaching treatments were used in this study. The amounts of iron, chromium, and nickel ions release from brackets were detected by inductively coupled plasma mass spectrometry. A scanning electron microscope and an atomic force microscopy were used to analyze the surface morphology and roughness, respectively. Results showed that the bleaching treatment and the bracket brand had a statistically significant influence on metal ions release (p<0.0001). Among the tested brackets, Tomy bracket treated with 10% H2O2 had the highest iron and nickel ions release, 3M Unitek bracket treated with 10% H2O2 had the highest chromium ions release. However, the amounts of the released metal ions were still below the critical value to induce a biological negative effect. Different surface topography was present among the tested brackets. The difference in surface topography with bleaching treatment did not correspond with metal ions release.
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