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- W1769133091 abstract "Objective: The purpose of this study was to evaluate the efficiency of experimental light-activated bleaching procedures. Background data: The improved color effect may be attributed to the potential photochemical effect of light-emitting diode (LED405), organic LED (OLED), and femtosecond laser rather than to the photothermal effect of conventional lights used for tooth bleaching. Materials and methods: Specially made pastilles of hydroxylapatite were immersed in green tea for 8 h and randomly divided into four groups (n=50) specified by the type of light source applied during a 30 min bleaching treatment: LED405, OLED, and femtosecond laser, or its absence (control group). Each group was treated with five bleaching gels: 10%, 16%, and 30% carbamide peroxide (CP), and 25% and 38% hydrogen peroxide (HP). Changes in color were determined by red–green–blue (RGB) colorimeter and ultraviolet-visible–near-infrared (UV/Vis/NIR) spectroscopy. Results: Regardless of the applied bleaching gel, LED405 produced a larger increase in the value of RGB index than did OLED and bleaching without light activation (p<0.05). Femtosecond laser also produced significantly better results in combination with 16% CP and 38% HP. Furthermore, application of a bleaching agent with a higher concentration of peroxide boosted the value of the RGB index. Spectroscopic measurements revealed similar results, although treatments with OLED were rated relatively better than in RGB analysis. Conclusions: The mechanisms of light-activated bleaching procedures had a significant effect on the color change. The bleaching activation with LED405 and higher concentrations of peroxide in bleaching agents promoted better whitening effect." @default.
- W1769133091 created "2016-06-24" @default.
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- W1769133091 date "2014-03-01" @default.
- W1769133091 modified "2023-09-26" @default.
- W1769133091 title "Optical Effects of Experimental Light-Activated Bleaching Procedures" @default.
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- W1769133091 doi "https://doi.org/10.1089/pho.2013.3658" @default.
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