Objective: The objective of this study was to evaluate the effects of a 405 nm diode laser on bleaching reaction of H2O2 and VL-TiO2 on methylene blue (MB) dye. Background data: Visible light activating titanium dioxide photocatalyst (VL-TiO2) may improve efficacy of hydrogen peroxide (H2O2) bleaching agents used in dentistry while contributing to their safety by lowering the required concentration of peroxide. Methods: The experimental solution was prepared with H2O2, VL-TiO2, MB, and pure water. The final concentration of H2O2 was 3.5% and that of MB was 10 ppm. The experimental solution of 3 mL in a quartz cell was irradiated by a 405 nm diode laser with various powers, duty cycles, and pulse durations for 7 min. Results: In all irradiation conditions, the increase in laser irradiation time gradually decreased the MB concentration. Irradiation by higher output power showed more reduction of MB concentration. Pulse durations as short as 5 ms with duty cycle reduced to 25% did not affect the degree of the reduction in MB concentration compared with continuous wave irradiation at the same average output power. Conclusions: It was concluded that using 405 nm diode laser, the bleaching effects of VL-TiO2 depended upon the irradiation time and the average output power, regardless of pulse duration or duty cycle.
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