Post-graduate Program in Dentistry, Dental School, University of Passo Fundo, Passo Fundo, Rio Grande do Sul, Brazil.
Faculty of Science, Department of Optics, University of Granada, Granada, Spain.
J Esthet Restor Dent. 2019 Mar;31(2):132-139. doi: 10.1111/jerd.12443. Epub 2018 Nov 29.
To evaluate the influence of a 35% hydrogen peroxide gel on color and whiteness changes of resin-based composites (RBC).
Discs (n = 10; shade A3.5 enamel; and 8 mm diameter and 2 mm thick) were fabricated from three RBC (DF- Durafill, Heraeus Kulzer; ED- IPS Empress Direct, Ivoclar Vivadent; and AP- Amelogen Plus, Ultradent Products). Three subgroups were obtained for each RBC: before bleaching (T ) and after first (T ) and second (T ) bleaching applications. A dental spectrophotometer (VITA Easyshade, Vita Zahnfabrik) was used to obtain CIELAB color coordinates and whiteness index for dentistry (WI ) in all periods. CIELAB ( ) and CIEDE2000 (ΔE ) color differences were also obtained. Perceptibility (PT) and acceptability (AT) thresholds were used to analyze values of , ΔE , and ΔWI . Two-way analysis of variance (ANOVA; for L*, a*, b*, and WI ) and one-way ANOVA and Tukey tests (for and ΔE ) were used to analyzed the results (α = 0.05).
L* and WI values from all RBC did not change after bleaching applications (T and T ) (P > .05). There were no significant differences in color differences ( and ΔE ) among all RBC evaluated after bleaching applications (T -T and T -T ; P > .05). Regardless of the RBC, mean values of ΔE between all different periods were always below 50%:50% PT value.
The 35% hydrogen peroxide bleaching gel influences on color and whiteness of resin-based composites. However, color changes were not clinically perceived and whiteness variations were clinically acceptable.
Patients should be advised that existing composite restorations might not match the natural tooth color after bleaching, and their replacement may be required.
评价 35%过氧化氢凝胶对树脂基复合材料（RBC）颜色和白度变化的影响。
从三种 RBC（DF- Durafill，Heraeus Kulzer；ED- IPS Empress Direct，Ivoclar Vivadent；AP- Amelogen Plus，Ultradent Products）中制备（n=10；釉质 A3.5 色；直径 8 毫米，厚 2 毫米）圆盘。每个 RBC 获得三个亚组：漂白前（T ）和第一次（T ）和第二次（T ）漂白应用后。使用牙科分光光度计（VITA Easyshade，Vita Zahnfabrik）在所有阶段获取 CIELAB 颜色坐标和牙科白度指数（WI ）。还获得了 CIELAB（ ）和 CIEDE2000（ΔE ）颜色差异。使用感知（PT）和可接受（AT）阈值分析 、ΔE 和ΔWI 的值。使用双向方差分析（ANOVA；对于 L*、a*、b* 和 WI ）和单向方差分析和 Tukey 检验（对于 和 ΔE ）分析结果（α=0.05）。
所有 RBC 的 L*和 WI 值在漂白应用后（T 和 T ）没有变化（P>.05）。在所有 RBC 中，漂白应用后（T -T 和 T -T ）的颜色差异（ 和 ΔE ）没有显著差异（P>.05）。无论 RBC 如何，所有不同时期之间的ΔE 的平均值始终低于 50%：50% PT 值。
35%过氧化氢漂白凝胶会影响树脂基复合材料的颜色和白度。然而，颜色变化未被临床察觉，且白度变化在临床可接受范围内。
应告知患者，现有复合修复体在漂白后可能与天然牙齿颜色不匹配，可能需要更换。
