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KMID : 1035320220490040153
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Korean Society for Dental Materials
2022 Volume.49 No. 4 p.153 ~ p.160
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Photocatalytic effect of doped-TiO2 nanoparticles on discolored teeth
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Shin Un-chul
Seol Hyo-Joung
Kwon Yong-Hoon
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Abstract
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The aim of this study was to determine the photocatalytic effect of doped-TiO2 nanoparticles (NPs) on teeth bleaching with an aid of 3% H2O2 and laser irradiation. For the study, Mo-N-TiO2 NPs were prepared. The characteristics of the prepared NPs, NPs morphology and light absorbance, were evaluated. Photocatalytic reactions of NPs were tested using 10 ppm methylene blue (MB) solution. Extracted teeth were pasted using carbomer gel for color differences measurements. Mo-N-TiO2 NPs have close to round shape with some tens nm size. Their absorbance was higher and longer than that of TiO2 NPs. For MB solution, Mo-N-TiO2 with 3% H2O2 condition showed much decrease in absorbance after laser irradiation for 20 min. Also, regardless of wavelength, Mo-N-TiO2 NPs produced much greater color difference (whitening) on teeth after 3 h than that by 15% H2O2.
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KEYWORD
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Bleaching agent, Mo-N-doped TiO2, Absorbance, Photocatalytic effect, Color difference
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