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Visible Light-Activated Titanium Dioxide Photocatalysis for In-Office Dental Bleaching

Objectives: The aim of this study was to evaluate the photocatalyst effect of visible light activated titanium dioxide (TiO2) employed in hydrogen peroxide (H2O2).
Methods: The TiO2 photocatalysis effect was evaluated using H2O2 in two different concentrations (3.5 and 35%) and methylene blue (MB), with or without light activation (LA) during different times, creating seven experimental groups. It was conducted an absorbance analysis of MB as the indicator of the bleaching outcome. The solutions were light activated for 5 minutes and the total time of TiO2 contact with the solutions was 15 min. The control group was without TiO2, and photoactivated for 5 min and the total time before the second absorbance analysis was 45 min. Color analysis (ΔE) was performed on bovine teeth (n=36) using H2O2 gel 6% and 35% (GH2O235%, GH2O235%+TiO2 and GH2O26%+TiO2). The samples were light activated (LA) for 5 minutes using a LED device, and total contact time action was 15 min before the second absorbance analysis. Only for the control group (GH2O235%), the time action was 45min. Data were analyzed with one-way and two-way analysis of variance (ANOVA), and significance level of 0.05. Holm-Sidak test was utilized for multiple comparisons.
Results: Solutions containing MB, H2O2 and TiO2, followed by LA, showed a statistically significant difference when compared with the other groups tested. When the two concentrations were compared, significant difference was also found, showing greater MB reduction for 35% H2O2. In tests employed on bovine teeth, GH2O235%+TiO2 gel showed no significant difference in comparison to GH2O235% (control group). All groups showed ΔE higher than 3.3.
Conclusions: In conclusion, titanium dioxide and hydrogen peroxide association is a promisor alternative for reducing the clinical time of in-office dental bleaching.
Division: IADR/AADR/CADR General Session
Meeting: 2017 IADR/AADR/CADR General Session (San Francisco, California)
Location: San Francisco, California
Year: 2017
Final Presentation ID: 1936
Abstract Category|Abstract Category(s): Dental Materials 7: Color and Appearance (Esthetics)
Authors
  • Cuppini, Marla  ( Universidade Federal do Rio Grande do Sul , Porto Alegre , Rio Grande do Sul , Brazil )
  • De Souza, Marcela  ( Universidade Federal do Rio Grande do Sul , Porto Alegre , Rio Grande do Sul , Brazil )
  • Kopp Alves, Annelise  ( Universidade Federal do Rio Grande do Sul , Porto Alegre , Rio Grande do Sul , Brazil )
  • Werner Samuel, Susana  ( Universidade Federal do Rio Grande do Sul , Porto Alegre , Rio Grande do Sul , Brazil )
  • Castelo Branco Leitune, Vicente  ( Universidade Federal do Rio Grande do Sul , Porto Alegre , Rio Grande do Sul , Brazil )
  • Mezzomo Collares, Fabrício  ( Universidade Federal do Rio Grande do Sul , Porto Alegre , Rio Grande do Sul , Brazil )
    • Financial Interest Disclosure: NONE
    SESSION INFORMATION
    Poster Session
    Color and Appearance (Esthetics) V
    Friday, 03/24/2017 , 11:00AM - 12:15PM
    TABLES
    Changes in MB concentration [ppm] at each H2O2 solution
    Solution35% Mean (SD)3.5% Mean (SD)
    SolMB10 (0) Aa10 (0) Aa
    SolMB+ H2O23.46 (0.18) Cb8.95 (0.34) Ba
    SolMB+H2O2+LA2.67 (0.17) Db8.72 (0.38) Ba
    SolMB+TiO29.25 (0.23) Ba9.04 (0.13) Ba
    SolMB+TiO2+LA9.06 (0.17) Ba9 (0.25) Da
    SolMB+H2O2+TiO20.95 (0.16) Eb1.85 (0.38) Ca
    SolMB+H2O2+TiO2+LA0.02 (0.01) Fb1.28 (0.23) Da
    Different capital letters indicate statistical difference in the same columns. Different small letters indicate statistical difference in the same line, p < 0.05.
    ΔE mean of each experimental group
    GroupΔE Mean (SD)
    GH2O2 35% (45 min)5.39 (1.11) A
    GH2O2 35%+TiO2 (15 min)4.17 (1.62) AB
    GH2O2 6%+TiO2 (15 min)3.38 (2.01) B
    Different capital letters indicate statistical difference, p < 0.05.