Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University - UNESP, 1680 Humaitá Street - 3rd floor, Centro, Mail Box: 331, ZIP Code 14801-903, Araraquara, São Paulo, Brazil.
Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University - UNESP, 1680 Humaitá Street - 3rd floor, Centro, Mail Box: 331, ZIP Code 14801-903, Araraquara, São Paulo, Brazil.
Photodiagnosis Photodyn Ther. 2022 Sep;39:103028. doi: 10.1016/j.pdpdt.2022.103028. Epub 2022 Jul 21.
Bleaching protocols using low concentration hydrogen peroxide (HP) photoactivated with LED sources have been widely discussed. Herein, we evaluated the whitening efficacy of 15% HP photoactivated with blue or violet LED compared to 35% HP.
Thirty bovine crowns were sectioned into 5 × 5 × 2 mm specimens. After staining in black tea, the specimens were randomized into three groups (n = 10): 35% HP, 15% HP + blue LED and 15% HP + violet LED. Two bleaching sessions were performed and the color assessment (∆L*, ∆a*, ∆b*, ∆E [CIELab], ∆E [CIEDE2000] and WI) was performed before, 24h after each session, 7 days and 1 month after the last session. Data were evaluated by two-way repeated measures ANOVA and Bonferroni post-test at a significance level of 5%.
All groups showed effective and similar results over 1 month of follow-up (p > 0.05), with only intragroup differences among the time intervals (p < 0.05).
The use of 15% HP photoactivated with blue or violet LED showed similar whitening efficacy compared to 35% HP. Thus, the association of low concentration bleaching gels with blue or violet LED sources can provide successful and less-aggressive treatment in terms of color change.
使用低浓度过氧化氢（HP）并通过 LED 光源进行光激活的漂白方案已经得到了广泛的讨论。在此，我们评估了与 35% HP 相比，用蓝光或紫光 LED 光激活的 15% HP 的美白效果。
将 30 个牛牙冠切成 5×5×2mm 的标本。在红茶染色后，将标本随机分为三组（n=10）：35% HP、15% HP+蓝光 LED 和 15% HP+紫光 LED。进行两次漂白疗程，并在每次疗程前、疗程后 24 小时、7 天和最后一次疗程后 1 个月进行颜色评估（∆L*、∆a*、∆b*、∆E[CIELab]、∆E[CIEDE2000]和 WI）。使用双向重复测量方差分析和 Bonferroni 事后检验评估数据，显著性水平为 5%。
所有组在 1 个月的随访中均显示出有效且相似的结果（p>0.05），只有各时间间隔内的组内差异（p<0.05）。
与 35% HP 相比，用蓝光或紫光 LED 光激活的 15% HP 显示出相似的美白效果。因此，将低浓度漂白凝胶与蓝光或紫光 LED 源联合使用可以在颜色变化方面提供成功且较不激进的治疗。
