Metal ion release from components of orthodontic fixed appliance immersed in preprocedural oxidizing mouthwash

ObjectiveThis study aims to compare the effect of 1.5% hydrogen peroxide (HP), 0.5% povidone-iodine (PI) and artificial saliva (AS) on metal ion release of fixed orthodontic appliance components.Materials and methods20 pieces of brackets, 4 pieces of buccal tubes, upper and lower 0.018" x 0.025" nickel titanium (NiTi) archwires, and upper and lower 0.019" x 0.025" stainless steel (SS) archwires were immersed in artificial saliva (Group A), 1.5% hydrogen peroxide (Group B) and 0.5% povidone-iodine (Group C) in individual beakers. The immersion was 12 hours for brackets and buccal tubes and 6 hours for archwires. The quantitative measurement of ferrum (Fe), chromium (Cr), nickel (Ni) and manganese (Mn) ions were analysed using Inductively Coupled Plasma Optic Emission Spectrometry (ICPOES). The data was analysed with one-way ANOVA followed by Tukey's post hoc test at alpha = 0.05.ResultsThe highest mean of metal ion release were ferrum (Fe), followed by manganese (Mn), nickel (Ni) and chromium (Cr). The highest mean of ion release was observed when fixed appliances were immersed in 0.5% povidone iodine, with a significant difference when compared to artificial saliva and 1.5% hydrogen peroxide. There were no significant differences in ion release between artificial saliva and 1.5% hydrogen peroxide.ConclusionMetal fixed orthodontic appliance components subjected to prolonged exposure to 0.5% povidone iodine mouthwash had a significant amount of ion release in comparison with 1.5% hydrogen peroxide.