Corrosive effect of disinfection solution containing hydroxyl radicals generated by photolysis of H₂O₂ on dental metals

Abstract

The purpose of the present study was to evaluate the corrosive effect of disinfection solution containing hydroxyl radicals generated by photolysis of H₂O₂on dental metals. Static immersion test was performed on four different dental metals: Ti, Type 316L stainless steel, Ag-Pd-Cu-Au alloy, and Co-Cr alloy. Metal specimens were immersed in 1 M H₂O₂(=3.4%) with or without light-emitting diode (LED) light irradiation (wavelength: 400 nm) for 1 week, and then the amounts of released ions were analyzed. Corrosive effect of the disinfection solution containing hydroxyl radicals on any dental metals tested in the present study never exceeded that of H₂O₂ alone. Therefore, disinfection systems based on the photolysis of H₂O₂ for the cleaning of dentures and treatment of oral infectious diseases would not cause problematic metal corrosion whenever the concentration of H₂O₂ does not exceed 3%, which is a concentration used as an oral disinfectant.