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Microstructural effect of a laser-activated bleaching agent containing titanium dioxide on human enamel
João Felipe Besegato1, Aryvelto Miranda Silva1, Eran Nair Mesquita de Almeida1
1Department of Restorative Dentistry, Araraquara School of Dentistry, São Paulo State University - UNESP, Araraquara, SP, Brazil.
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 1st appointment, T1 - after 2nd appointment, and T2-7 days after 2nd 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.
