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
Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil.
Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil.
Photodiagnosis Photodyn Ther. 2023 Jun;42:103561. doi: 10.1016/j.pdpdt.2023.103561. Epub 2023 Apr 8.
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) and showed stability after the third one, for all the groups. No differences were observed among HP, HP + BL, and HP + VL groups, regardless of the evaluation time (p > 0.05). HP and C showed the greatest and smallest reduction in dentin microhardness (p < 0.05), respectively. No difference between HP + BL and HP + VL protocols (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.
评估使用35%过氧化氢并通过紫色发光二极管光激活的牙齿漂白方案对根管治疗后牙齿颜色和显微硬度的效果。
选取40个样本并随机分为4组（n = 10）：C组 - 对照组，HP组 - 35%过氧化氢组，HP + BL组 - 35%过氧化氢 + 蓝色发光二极管组，HP + VL组 - 35%过氧化氢 + 紫色发光二极管组。每组进行三次漂白疗程。每次漂白疗程后7天进行颜色分析。采用双向重复测量方差分析和Bonferroni检验来评估不同漂白方案和评估时间对因变量（∆E和∆L）的影响。在第三次漂白疗程后24小时测量牙本质显微硬度。数据采用方差分析和Tukey检验进行评估，显著性水平为5%。
在第一次和第二次漂白疗程后，所有组的∆E和∆L均有差异（p < 0.05），第三次漂白疗程后显示出稳定性。无论评估时间如何，HP组、HP + BL组和HP + VL组之间均未观察到差异（p > 0.05）。HP组和C组分别显示出牙本质显微硬度降低最多和最少（p < 0.05）。未观察到HP + BL方案和HP + VL方案之间存在差异（P > 0.05）。
用紫色发光二极管光激活的高浓度过氧化氢（35%）能有效漂白根管治疗后的牙齿。然而，相同方案对牙本质显微硬度有负面影响，但程度不如单独使用35%过氧化氢。
