Korean J Dent Mater.  2019 Sep;46(3):175-184. 10.14815/kjdm.2019.46.3.175.

Bleaching of stained resin using nitrogen doped-TiOâ‚‚ nanoparticles

  • 1Department of Oral Biochemistry, School of Dentistry, Pusan National University, Korea.
  • 2Department of Dental Materials, School of Dentistry, Pusan National University, Korea. y0k0916@pusan.ac.kr


There has been increasing use of the Hâ‚‚Oâ‚‚-based teeth bleaching agents. The purpose of this study was to evaluate the bleaching effectiveness of the laser irradiation combined with nitrogen doped-TiOâ‚‚ nanoparticles (NPs) on the stained resin. Nitrogen (N) doped-TiOâ‚‚ NPs were prepared under sol-gel method. Light absorbance, X-ray diffraction patterns of NPs, and bleaching 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 TiOâ‚‚, N-TiOâ‚‚ showed high absorbance after 400 nm. N-TiOâ‚‚, which have used TiN as a precursor, showed a new rutile phase at the TiN structure. For methylene blue solution, N-TiOâ‚‚ with 3% Hâ‚‚Oâ‚‚ resulted in the greatest absorbance decrease after laser irradiation regardless of wavelength. For stained resin test, N-TiOâ‚‚ with 3% Hâ‚‚Oâ‚‚ resulted in the greatest color difference after laser irradiation, followed by group that used N-TiOâ‚‚ without 3% Hâ‚‚Oâ‚‚.


Bleaching agent; N-doped TiOâ‚‚; Absorbance; XRD; Color difference
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