de Almeida Eran Nair Mesquita, Silva Aryvelto Miranda, Besegato João Felipe, de Sousa Gomes Costa Joatan Lucas, Manzoli Tatiane Miranda, 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 Dentistry, Federal University of Juiz de Fora (UFJF), Campus Governador Valadares, Governador Valadares, MG, Brazil.
Photodiagnosis Photodyn Ther. 2023 Jun;42:103329. doi: 10.1016/j.pdpdt.2023.103329. Epub 2023 Feb 8.
Few studies have investigated the effect of violet LED irradiation associated or not with bleaching agents on blood-stained teeth. This in vitro study aimed to evaluate the whitening efficacy and color stability of non-vital dental bleaching using 35% hydrogen peroxide (HP) photoactivated with violet LED (VL) compared to 35% HP alone and 35% HP photoactivated with blue LED (BL).
Fifty bovine dental crowns were used to obtain specimens of 5 × 5 × 2 mm. After selection based on a previous colorimetric analysis, the specimens were blood-stained and randomly assigned into five groups (n = 10): control (no treatment); 35% HP, 35% HP/BL; 35% HP/VL; and VL. Three bleaching sessions were performed and the colorimetric analysis (∆E ∆L, and ∆WI) was recorded after 7 days, 30 days, and 9 months of the last bleaching session. Two-way repeated measures ANOVA followed by Bonferroni post-hoc test was used at a significance level of 5%.
35% HP, 35% HP/BL, and 35% HP/VL showed higher values of ∆E ∆L, e ∆WI (P < 0.05), without intra- and intergroup differences (P > 0.05). C and VL were similar in all the evaluation times (P > 0.05), showing lower values of ∆E ∆L, and ∆WI (P < 0.05).
35% HP/VL can be a viable alternative for dental bleaching in endodontically-treated teeth, showing bleaching efficacy similar to 35% HP solely used, even after a 9-month follow-up. VL used alone was not effective to bleach blood-stained teeth.
很少有研究调查紫色发光二极管（LED）照射联合或不联合漂白剂对血渍牙的影响。这项体外研究旨在评估与单独使用35%过氧化氢（HP）以及与蓝色LED（BL）光活化的35%HP相比，用紫色LED（VL）光活化的35%HP进行非活髓牙漂白的美白效果和颜色稳定性。
使用50个牛牙冠获取5×5×2毫米的样本。在基于先前的比色分析进行选择后，将样本染上血渍并随机分为五组（n = 10）：对照组（不治疗）；35%HP组、35%HP/BL组；35%HP/VL组；以及VL组。进行三次漂白疗程，并在最后一次漂白疗程后的7天、30天和9个月记录比色分析（∆E、∆L和∆WI）。采用双向重复测量方差分析，随后进行Bonferroni事后检验，显著性水平为5%。
35%HP组、35%HP/BL组和35%HP/VL组的∆E、∆L和∆WI值较高（P < 0.05），组内和组间无差异（P > 0.05）。对照组和VL组在所有评估时间相似（P >
