São Leopoldo Mandic Research Institute, Division of Cariology and Restorative Dentistry, Campinas, São Paulo, Brazil.
São Leopoldo Mandic Research Institute, Division of Cariology and Restorative Dentistry, Campinas, São Paulo, Brazil,
Am J Dent. 2024 Jun;37(3):154-158.
To evaluate the effect of filled and unfilled modeler liquids on the cohesive strength and color stability when applied in between the resin composite layers in the stratification technique and on the uppermost surface layer.
For the cohesive strength test (n= 10), 30 cylindrical samples were packed into a Teflon mold (6x2 mm) in 2 mm increments. Firstly, a dentin-shade resin composite (Empress Direct) was placed, followed by the accommodation of a body-shade resin composite (Filtek Z350 XT) and an enamel-shade resin composite (Estelite Omega). Before photoactivation of each increment, an unfilled (Signum Liquid) or filled (Modeling Resin) modeler liquid was applied between the first and second layers and on the uppermost surface layer. The control group (n= 10) did not receive modeler liquid. Cohesive strength was measured in a universal testing machine. For the color test (n= 10), the other 30 samples were fabricated for the cohesive strength test, except for the difference in the diameter (6x6 mm). Before and after the staining of the samples, color was measured using the CIELab* system with a spectrophotometer (EasyShade). Data were submitted to ANOVA, Kruskal-Wallis test, or Mann-Whitney test (α= 5%).
Modeler liquids significantly increased cohesive strength (P= 0.008), while ΔEab (P= 0.003) and ΔE₀₀ (P= 0.005) values presented significantly lower changes for the groups that received modeler liquids, with no significant difference between unfilled and filled modeler liquids.
Apart from increasing the interfacial strength of stratified restorations, modeler liquids minimized staining.
评估分层技术中在树脂复合材料层之间以及最上层应用填充和未填充模型液对粘合力和颜色稳定性的影响。
为了进行粘合力测试（n=10），将 30 个圆柱形样本以 2mm 的增量装入聚四氟乙烯模具（6x2mm）中。首先，放置一层牙本质色树脂复合材料（Empress Direct），然后容纳一层体瓷色树脂复合材料（Filtek Z350 XT）和一层釉质色树脂复合材料（Estelite Omega）。在每个增量的光固化之前，在第一层和第二层之间以及最上层应用未填充（Signum Liquid）或填充（Modeling Resin）的模型液。对照组（n=10）未接收模型液。在万能试验机上测量粘合力。对于颜色测试（n=10），另外 30 个样本用于进行粘合力测试，除了直径的差异（6x6mm）。在对样本进行染色前后，使用分光光度计（EasyShade）用 CIELab*系统测量颜色。数据提交给 ANOVA、Kruskal-Wallis 检验或 Mann-Whitney 检验（α=5%）。
模型液显著提高了粘合力（P=0.008），而对于接受模型液的组，ΔEab（P=0.003）和ΔE₀₀（P=0.005）值的变化显著较小，未填充和填充模型液之间没有显著差异。
除了提高分层修复体的界面强度外，模型液还最大限度地减少了染色。
