Effect of non-vital tooth bleaching photoactivated with blue or violet LED on color and microhardness

•35% HP associated with violet LED change the color of non-vital tooth effectively.•HP + VL and HP + BL showed the same bleaching efficacy of 35% HP used alone.•HP, HP + BL, and HP + VL decreased the dentin microhardness. To evaluate the efficacy of dental bleaching protocols using 35% hydrogen pero...

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Published in:Photodiagnosis and photodynamic therapy 2023-06, Vol.42, p.103561-103561, Article 103561
Main Authors: de Almeida, Eran Nair Mesquita, Costa, Joatan Lucas de Sousa Gomes, Besegato, João Felipe, Silva, Aryvelto Miranda, Manzoli, Tatiane Miranda, Vitória, Matheus Sousa, de Andrade, Marcelo Ferrarezi, Kuga, Milton Carlos
Format: Article
Language:English
Subjects:
Dental bleaching
Endodontics
Hydrogen peroxide
LED
Microhardness
violet
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Summary:•35% HP associated with violet LED change the color of non-vital tooth effectively.•HP + VL and HP + BL showed the same bleaching efficacy of 35% HP used alone.•HP, HP + BL, and HP + VL decreased the dentin microhardness. To evaluate the efficacy of dental bleaching protocols using 35% hydrogen peroxide photoactivated with violet LED on color and microhardness of endodontically treated teeth. Forty specimens were selected and randomized into 4 groups (n = 10): C - Control, HP - 35% hydrogen peroxide, HP + BL - 35% hydrogen peroxide + blue LED, HP + VL - 35% hydrogen peroxide + violet LED. Three bleaching sessions were performed for each group. Color analysis was performed 7 days after each bleaching session. Two-way repeated measure ANOVA and Bonferroni test were used to evaluate the effect of different bleaching protocols and evaluation times on the dependent variables (∆E and ∆L). Dentin microhardness was measured 24 h after the third bleaching session. Data were evaluated by ANOVA and Tukey's test at a significance level of 5%. Differences on ∆E and ∆L were verified after the first and second bleaching sessions (p  0.05). HP and C showed the greatest and smallest reduction in dentin microhardness (p  0.05) was observed. High concentration hydrogen peroxide (35%) photoactivated with violet LED bleached endodontically treated teeth effectively. However, the same protocol negatively affected the dentin microhardness, but not in the same level of 35% HP solely used. [Display omitted]
ISSN:1572-1000
1873-1597
DOI:10.1016/j.pdpdt.2023.103561