Dalmolin Andressa, Perez Bibiana Gabardo, Gaidarji Bruna, Ruiz-López Javier, Lehr Roberta Maronesi, Pérez María M, Durand Letícia Brandão
Graduate Program in Dentistry, School of Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
Department of Optics, Faculty of Science, University of Granada, Granada, Spain.
J Esthet Restor Dent. 2021 Jul;33(5):807-814. doi: 10.1111/jerd.12740. Epub 2021 Jun 1.
Evaluate the masking ability of bleach-shade resin composites applied by multilayering techniques over colored substrates.
Disc-shaped specimens were fabricated from bleach-shade resin composites using different multilayering techniques. Substrates were produced in opaque ceramic discs simulating colored substrates (A2, A3, A3.5, C2, C3, C4) and a bleached tooth (0M1). Color coordinates were obtained using a reflectance spectrophotometer. Color difference was calculated by CIEDE2000 using coordinates of 0 M1 ceramic as standard reference. Data were analyzed by one-way ANOVA and Tukey's post-hoc test (p ≤ 0.05). Masking ability interpretation was based on perceptibility and acceptability thresholds.
All combinations presented ΔE above the acceptable threshold (ΔE >1.8), ranging from 2.49 to 7.42, regardless of the restorative system, multilayering strategy or substrate color. Multilayering combinations placed over A2, A3 and A3.5 were moderately (1.8<ΔE ≤3.6) and clearly unacceptable (3.6<ΔE ≤5.4), combinations associated with C2, C3 and C4 were clearly unacceptable and, extremely unacceptable (ΔE >5.4). Lower ΔE was observed for combinations with 0.5 mm extra white enamel layer (2.49), or 1.0 mm white dentin layer (2.69), over A2 and A3.5 substrates. Lightness difference showed the greatest contribution to ΔE .
Bleach-shade resin composite systems applied by the multilayering technique were not able to ensure effective masking ability.
Bleach-shade resin composites applied with different combinations of the multilayering technique were not effective in masking colored substrates. Alternative strategies, techniques and dental materials should be explored to obtain acceptable masking.
评估采用多层技术应用的漂白色调树脂复合材料对有色基底的遮色能力。
使用不同的多层技术，由漂白色调树脂复合材料制作圆盘形试件。基底采用不透明陶瓷圆盘制作，模拟有色基底（A2、A3、A3.5、C2、C3、C4）和漂白后的牙齿（0M1）。使用反射分光光度计获取颜色坐标。以0M1陶瓷的坐标作为标准参考，通过CIEDE2000计算色差。数据采用单因素方差分析和Tukey事后检验（p≤0.05）进行分析。遮色能力的解释基于可察觉性和可接受性阈值。
无论修复系统、多层策略或基底颜色如何，所有组合的ΔE均高于可接受阈值（ΔE>1.8），范围为2.49至7.42。置于A2、A3和A3.5上的多层组合为中度不可接受（1.8<ΔE≤3.6）和明显不可接受（3.6<ΔE≤5.4），与C2、C3和C4相关的组合为明显不可接受和极度不可接受（ΔE>5.4）。在A2和A3.5基底上，与0.5毫米额外白色釉质层（2.49）或1.0毫米白色牙本质层（2.69）组合的ΔE较低。明度差异对ΔE的贡献最大。
采用多层技术应用的漂白色调树脂复合系统无法确保有效的遮色能力。
采用不同多层技术组合应用的漂白色调树脂复合材料在遮色有色基底方面无效。应探索替代策略、技术和牙科材料以获得可接受的遮色效果。
