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Abstract

Introduction: Tea, lemon tea and cola are common beverage in our life. The purpose of the present study is to investigate the corrosion behavior of self-ligating and conventional metal brackets in soft drinks. Materials and Methods: Totally, 198 brackets were used. There are Damon Q (Ormco, USA), P OPA-K (TOMY, Japan) and Tenbrook one (OrthoClass, USA).They were all made of 17-4 PH stainless steel. They were divided into four groups of immersing solutions: artificial saliva, tea, lemon tea, and cola. Brackets were immersed in these solutions at an ovan under 37°C for one day and thirty days. Immersing solutions were detected for concentration of Nickel, Chrome, and Iron by ICP-MS. Photos of brackets immersed for one day and thirty days were taken by metallioscope. P value was set at 0.05. Results: Damon Q have significantly the highest concentration of Nickel in artificial saliva, tea, and cola. Damon Q also have significantly the highest concentration of Chrome in tea, and lemon tea. Tenbrook one have significantly the highest concentration of Iron in lemon tea, and cola. Conclusion: The surface`s process and manufacture’s procedure significantly affect the corrosion behavior. The concentration of metal release from immersed metal brackets did not increase by immersing solution’s acid concentration. The concentrations of Nickel, Chrome, and Iron from immersing solutions were all below the daily intake of adults. However, to avoid of the extra release of Nickel from brackets, be careful of intake of soft drinks.

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