Microstructural effect of a laser-activated bleaching agent containing titanium dioxide on human enamel

João Felipe Besegato; Aryvelto Miranda Silva; Eran Nair Mesquita de Almeida; Alessandra Nara de Souza Rastelli; Ricardo Takahashi; Cássia Cilene Dezan-Garbelini; Márcio Grama Hoeppner

doi:10.4103/JCD.JCD_312_19

Microstructural effect of a laser-activated bleaching agent containing titanium dioxide on human enamel

J Conserv Dent. 2020 Nov-Dec;23(6):558-562. doi: 10.4103/JCD.JCD_312_19. Epub 2021 Feb 11.

Authors

João Felipe Besegato¹, Aryvelto Miranda Silva¹, Eran Nair Mesquita de Almeida¹, Alessandra Nara de Souza Rastelli¹, Ricardo Takahashi², Cássia Cilene Dezan-Garbelini², Márcio Grama Hoeppner³

Affiliations

¹ Department of Restorative Dentistry, Araraquara School of Dentistry, São Paulo State University - UNESP, Araraquara, SP, Brazil.
² Department of Oral Medicine and Paediatric Dentistry, State University of Londrina - UEL, Londrina, PR, Brazil.
³ Department of Restorative Dentistry, State University of Londrina - UEL, Londrina, PR, Brazil.

Abstract

Aim: This study aimed to evaluate the effect of a laser-activated bleaching agent containing titanium dioxide (TiO₂) nanoparticles on enamel roughness and hardness.

Materials and methods: Twenty human premolars were randomized into two groups according to the bleaching treatments performed: HP - 35% hydrogen peroxide and HP + TiO₂ - 30% hydrogen peroxide containing TiO₂ light-activated by diode laser (980 nm). It was performed two bleaching sessions with an interval of 7 days. Microhardness and roughness of the enamel were assessed at three times: T0 - Before 1^st appointment, T1 - after 2^nd appointment, and T2-7 days after 2^nd appointment.

Results: The HP + TiO₂ did not cause changes on enamel roughness and hardness and presented the same effects of the HP.

Conclusions: Both bleaching agents showed no difference between them. Then, it is possible to conclude that both are viable for clinical use during in-office dental bleaching technique regarding the microstructural changes that they might cause.

Keywords: Hardness; hydrogen peroxide; laser; roughness; titanium dioxide.