背景:很少有研究调查了与漂白剂相关或不相关的紫色LED照射对血液染色牙齿的影响。这项体外研究旨在评估使用35%过氧化氢(HP)光活化的紫色LED(VL)与35%HP单独和35%HP光活化的蓝色LED(BL)相比,非生命牙齿漂白的美白功效和颜色稳定性。
方法:用50个牛牙冠获得5×5×2mm的标本。在根据先前的比色分析进行选择之后,将标本进行血液染色,并随机分为五组(n=10):对照组(未治疗);35%HP,35%HP/BL;35%HP/VL;和VL。进行了三次漂白试验和比色分析(ΔEab,ΔL,和ΔWID)在7天后记录,30天,和9个月的最后一次漂白会议。在5%的显著性水平下使用双向重复测量ANOVA和随后的Bonferroni事后检验。
结果:35%生命值,35%HP/BL,和35%HP/VL显示更高的ΔEab值,ΔL,eΔWID(P<0.05),无组内和组间差异(P>0.05)。C和VL在所有评估时间上相似(P>0.05)。显示ΔEab的较低值,ΔL,和ΔWID(P<0.05)。
结论:35%HP/VL可以作为牙髓治疗牙齿漂白的可行替代方法,显示类似于单独使用的35%HP的美白功效,即使经过9个月的随访。单独使用的VL不能有效漂白染血的牙齿。
BACKGROUND: 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).
METHODS: 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 (∆Eab, ∆L, and ∆WID) 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%.
RESULTS: 35% HP, 35% HP/BL, and 35% HP/VL showed higher values of ∆Eab, ∆L, e ∆WID (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 ∆Eab, ∆L, and ∆WID (P < 0.05).
CONCLUSIONS: 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.