Titanium dioxide nanotubes incorporated into bleaching agents: physicochemical characterization and enamel color change

Autor: Naianne Ramos MONTEIRO, Rosanna Tarkany BASTING, Flávia Lucisano Botelho do AMARAL, Fabiana Mantovani Gomes FRANÇA, Cecilia Pedroso TURSSI, Orisson Ponce GOMES, Paulo Noronha LISBOA FILHO, Kamila Rosamilia KANTOVITZ, Roberta Tarkany BASTING
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Journal of Applied Oral Science, Vol 28 (2020)
Druh dokumentu: article
ISSN: 1678-7765
1678-7757
DOI: 10.1590/1678-7757-2019-0771
Popis: Abstract Titanium dioxide nanotubes are nanostructures that can accelerate the oxidation reaction of bleaching procedures and promote a more effective whitening effect. Objective This study evaluated physicochemical properties of bleaching agents incorporated with titanium dioxide (TiO2) nanotubes, and the effects on tooth color change at different periods. Methodology 40 premolars were treated according to the following groups (n=10): CP - 10% carbamide peroxide (1 hour daily/21 days); CPN - CP incorporated into TiO2; HP - 40% hydrogen peroxide (three 40-minute sessions/7 days apart); HPN - HP incorporated into TiO2. Color shade was evaluated at five different periods (baseline, after 7, 14 and 21 days of bleaching, and 7 days after end of treatment) according to Vita Classical, CIELab and CIEDE2000 scales. Mean particle size (P), polydispersity (PO) and zeta potential (ZP) were evaluated using dynamic light scattering. Data on the different variables were analyzed by mixed model tests for measures repeated in time (ZP e L*), generalized linear models for measures repeated in time (P, PO, Vita Classical and b*), and Friedman and Mann-Whitney tests (a* and color change/ΔE and ΔE00). Results CP and CPN presented higher P, higher PO and lower ZP than HP and HPN (p≤0.05). All groups showed a significant decrease in Vita Classical color scores after 7 days of bleaching (p0.05) in bleaching time. A significant reduction occurred in the a* and b* values for all the groups, and HPN presented lower a* and b* values (p
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