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KMID : 1035320190460030175
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Korean Society for Dental Materials
2019 Volume.46 No. 3 p.175 ~ p.184
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Bleaching of stained resin using nitrogen doped-TiO2 nanoparticles
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Moon Keun
Jung Sang-Bong
Seol Hyo-Joung
Kang Jung-Sook
Kwon Yong-Hoon
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Abstract
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There has been increasing use of the H2O2-based teeth bleaching agents. The purpose of this study was to evaluate thebleaching effectiveness of the laser irradiation combined with nitrogen doped-TiO2 nanoparticles (NPs) on the stained resin.
Nitrogen (N) doped-TiO2 NPs were prepared under sol-gel method. Light absorbance, X-ray diffraction patterns of NPs, andbleaching of methylene blue and stained resins were evaluated. For bleaching of stained resin, NPs-containing gel was used.
For irradiation, light of two different wavelengths was used. Unlike TiO2, N-TiO2 showed high absorbance after 400 nm.
N-TiO2, which have used TiN as a precursor, showed a new rutile phase at the TiN structure. For methylene blue solution,N-TiO2 with 3% H2O2 resulted in the greatest absorbance decrease after laser irradiation regardless of wavelength. For stainedresin test, N-TiO2 with 3% H2O2 resulted in the greatest color difference after laser irradiation, followed by group that usedN-TiO2 without 3% H2O2.
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KEYWORD
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Bleaching agent, N-doped TiO2, Absorbance, XRD, Color difference
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