| ORIGINAL ARTICLE |
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| Year : 2020 | Volume
: 23
| Issue : 6 | Page : 558-562 |
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Microstructural effect of a laser-activated bleaching agent containing titanium dioxide on human enamel
Joao Felipe Besegato1, Aryvelto Miranda Silva1, Eran Nair Mesquita de Almeida1, Alessandra Nara de Souza Rastelli1, Ricardo Takahashi2, Cassia Cilene Dezan-Garbelini2, Márcio Grama Hoeppner3
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
 Source of Support: None, Conflict of Interest: None  | Check |
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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