Physicochemical evaluation of hydrogen peroxide bleaching gels containing titanium dioxide catalytic agent, and their influence on dental color change associated with violet LED

Author(s)

Carlos, Natalia Russo ; Basting, Rosanna Tarkany ; do Amaral, Flavia Lucisano Botelho ; Franca, Fabiana Mantovani Gomes ; Turssi, Cecilia Pedroso ; Kantovitz, Kamila Rosamilia ; Bronze-Uhle, Erika Soares ; Lisboa Filho, Paulo Noronha ; Cavalli, Vanessa ; Basting, Roberta Tarkany

• Document type: Journal article
• Source: Photodiagnosis and Photodynamic Therapy; v. 41, p. 8-pg., 2023-01-03.

Abstract

Background: The purpose of this study was: 1) to analyze the physical-chemical properties of hydrogen peroxide (HP) agents at 7.5% (HP7) and 35% (HP35), and the association with or without TiO2 nanotubes; 2) to evaluate dental bleaching effectiveness by using HP7 and HP35 together with or without TiO2 nanotubes, and applied with or without violet LED (VL). Methodology: 80 bovine incisors were treated according to groups (n = 10): HP35; HP35 + VL; HP35T (HP35 + TiO2); HP35T + VL; HP7; HP7 + VL; HP7T (HP7 + TiO2); HP7T + VL. Bleaching effectiveness was measured at 4 time points according to the Vita Classical, CIEL*a*b*, CIEDE2000, and WID parameters. HP35, HP35T, HP7, and HP7T were evaluated for mass change, pH, mean particle size (P), polydispersity (PDI), and zeta potential (ZP), over 6 months of storage.Results: The pH of HP35 thickener was higher when associated to TiO2. At baseline, both of the bleaching gels containing TiO2 had lower P, PDI, and PZ (p < 0.05). All groups showed a significant decrease in Vita Classical color scores (p = 0.0037). There was a higher L* value, and lower b* values for HP7 when associated to VL after the 3rd session. (p < 0.05). HP35T showed higher color change (Delta Eab, Delta E00), and lower a* value in the presence of VL (p < 0.05). Delta WID presented lower values for both gels, when TiO2 was incorporated (p <= 0.05).Conclusion: The incorporation of TiO2 to the bleaching gel showed good stability with minimal variations in physical-chemical properties. The color change in HP35 was more effective than in HP7, but the VL boosted the bleaching effectiveness of HP7, whereas TiO2 did not increase bleaching effectiveness. (AU)

• FAPESP's process: 20/11031-8 - Incorporation of TiO2 in low concentration bleaching agent for in-office use associated with violet light: physical-chemical properties of the bleaching gel, influence on tooth color, cell cytotoxicity and effect on the dentin matrix
• Grantee: Roberta Tarkany Basting Höfling
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/00710-1 - Titanium dioxide nanotubes (TiO2) incorporated into bleaching agents for in-office use associated to violet light: physicochemical properties of bleaching gel, enamel color change, pulp chamber temperature, and cell cytotoxicity
• Grantee: Natália Russo Carlos
• Support Opportunities: Scholarships in Brazil - Doctorate