Journal of Conservative Dentistry
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ORIGINAL ARTICLE
Year : 2020  |  Volume : 23  |  Issue : 6  |  Page : 558-562

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


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

Correspondence Address:
Dr. Joao Felipe Besegato
Department of Restorative Dentistry, Araraquara School of Dentistry, 1680 Humaitá Street - 3rd Floor, ZIP Code: 14801-903, Araraquara, SP
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JCD.JCD_312_19

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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.


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