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LED/laser photoactivation enhances the whitening efficacy of low concentration hydrogen peroxide without microstructural enamel changes.
- Source :
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Photodiagnosis and photodynamic therapy [Photodiagnosis Photodyn Ther] 2021 Dec; Vol. 36, pp. 102511. Date of Electronic Publication: 2021 Aug 29. - Publication Year :
- 2021
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Abstract
- Background: The association of low concentration hydrogen peroxide (HP) and a light source has been widely used to achieve efficient bleaching. We investigated the colorimetric and microstructural changes of bovine enamel bleached with 6% HP associated or not with a hybrid light source system of violet light and laser (LED/laser).<br />Methods: Twenty bovine crowns were used to obtain specimens of 7 × 7 × 2 mm. Then, they were randomized in two groups (n=10): 6% HP and 6% HP + LED/laser. After staining with dark tea solution, three bleaching sessions were performed. Colorimetric evaluation (∆L*, ∆a*, ∆b*, ∆E <subscript>00</subscript> [CIEDE2000] and WI <subscript>D</subscript> ) after 24 hours of each session and 7 days after the final bleaching session was performed. Enamel Vickers microhardness at baseline, 24 hours and 7 days after the last bleaching session were also evaluated. Two-way repeated measures ANOVA and Bonferroni post-test was used at a significance level of 5%.<br />Results: 6% HP and 6% + HP LED/laser showed satisfactory bleaching results. The group photoactivated showed higher WI <subscript>D</subscript> values (p<0.05). Differences between groups were observed for ∆E <subscript>00</subscript> , ∆L* and ∆a* (p<0.05), except for ∆b* (p>0.05). Intra-group differences were also found (p<0.05). Regarding microhardness, no inter or intra-group differences were observed (p>0.05).<br />Conclusions: The photoactivation with LED/laser enhanced the whitening efficacy of 6% HP compared to the group without photoactivation. Thus, the LED/laser activation appears to be a good option when using low concentration HP-based agents. In addition, both bleaching protocols did not cause changes on enamel microhardness.<br /> (Copyright © 2021. Published by Elsevier B.V.)
Details
- Language :
- English
- ISSN :
- 1873-1597
- Volume :
- 36
- Database :
- MEDLINE
- Journal :
- Photodiagnosis and photodynamic therapy
- Publication Type :
- Academic Journal
- Accession number :
- 34469795
- Full Text :
- https://doi.org/10.1016/j.pdpdt.2021.102511