Tooth bleaching using hydrogen peroxide is a complex process and there is still some controversy about the roles of pH, temperature, chemical and physical activators in the process of hydrogen peroxide decomposition.
The purpose of this research is to study the influence of two physical factors - blue light (LED, 450 nm,750 mW/cm ) and electric current (2mA) on the concentration and the decomposition rate of hydrogen peroxide in two tooth bleaching products: Opalescence Boost, 40% Hydrogen Peroxide (Ultradent) and a `white gel` (20% Hydrogen Peroxide) by a chemical method-classic iodometric titration.
The results for both products were analogical. Both blue light irradiation and electrical current increased the concentration and the oxidation potential of hydrogen peroxide in both tooth bleaching products in comparison to the gradual decrease of hydrogen peroxide concentration determined in the samples without physical activation.
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