Department of Dentistry, State University of Maringá, Avenue Mandacaru, 1550, Maringá, 87080-000, Brazil.
Department of Physics, State University of Maringá, Avenue Colombo, 5790, Maringá, PR, 87020-900, Brazil.
Clin Oral Investig. 2022 Mar;26(3):2635-2643. doi: 10.1007/s00784-021-04232-9. Epub 2021 Oct 25.
This study aims to evaluate the opalescence (OP) and color stability of composite resins over a period of 180 days and to compare composite resins' OP with enamel's OP.
Twenty human enamel specimens (5.0 × 0.3 mm) and 9 specimens (10.0 × 1.0 mm) of 10 colors of 4 different composite resins (3 M ESPE, FGM, Ivoclar-Vivadent, Miscerium) and one brand of adhesive (3 M ESPE) were made. The results were obtained by measuring the reflectance and transmittance spectra in the visible region. After baseline measurement, composites and adhesive were analyzed after 2, 7, 30, 60, 120, and 180 days. The Lab color coordinates were used in the calculations of the OP parameter and color differences in the CIELab and CIEDE2000 methods. The data were analyzed statistically.
The materials tested showed variation and an increase in OP over time. The OP found for enamel was 18.06 ± 2.99, and some resins showed higher results. There was a strong correlation between the coordinate b*T and the OP over time. Enamel Plus was the only one material that presented no color changes during all periods in both color analyses. Filtek Z350 XT, AT, and BT did not show differences in any time when analyzed by CIELAB.
The OP of most composite resins changed during the period of 180 days and was different from the OP of tooth enamel. In general, composites demonstrated small color changes over the period tested, being this characteristic material dependent.
Natural teeth present different optical properties. Composite resins restorations should present properties similar to natural teeth and it is important that characteristics like color and opalescence remain stable over time.
本研究旨在评估复合树脂在 180 天内的乳光（OP）和颜色稳定性，并比较复合树脂的 OP 与牙釉质的 OP。
制作了 20 个人类牙釉质标本（5.0×0.3mm）和 9 个（10.0×1.0mm）10 种颜色的 4 种不同复合树脂（3M ESPE、FGM、Ivoclar-Vivadent、Miscerium）和 1 种品牌的胶粘剂（3M ESPE）的样本。通过测量可见区域的反射率和透射率光谱来获得结果。基线测量后，在 2、7、30、60、120 和 180 天后分析复合材料和胶粘剂。在 CIELab 和 CIEDE2000 方法中，使用 Lab 颜色坐标计算 OP 参数和颜色差异。对数据进行了统计分析。
测试的材料显示出随时间的变化和 OP 的增加。牙釉质的 OP 为 18.06±2.99，一些树脂的结果更高。在 b*T 坐标和 OP 之间存在很强的相关性。在两种颜色分析中，只有 Enamel Plus 在所有时期都没有显示出颜色变化。在任何时间，Filtek Z350 XT、AT 和 BT 在 CIELAB 分析中都没有差异。
大多数复合树脂的 OP 在 180 天的时间内发生变化，与牙釉质的 OP 不同。一般来说，在测试期间，复合材料表现出较小的颜色变化，这是材料依赖性的特征。
天然牙齿具有不同的光学特性。复合树脂修复体应具有与天然牙齿相似的特性，并且颜色和 OP 等特性随时间保持稳定非常重要。
