Postgraduate student, Department of Prosthodontics, Faculty of Dentistry, Bezmialem Vakif University, Istanbul, Turkey.
Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Altinbas University, Istanbul, Turkey.
J Prosthet Dent. 2018 Oct;120(4):546-552. doi: 10.1016/j.prosdent.2017.12.003. Epub 2018 Apr 25.
The color of resin cements and computer-aided-design and computer-aided-manufacturing (CAD-CAM) restorations may change with aging.
The purpose of this in vitro study was to analyze the influence of thermocycling on the color of CAD-CAM materials with underlying resin cement.
Seven different CAD-CAM materials, composite resins and glass-ceramics were cut into 0.7-mm and 1.2-mm thicknesses (n=10) and cemented with a dual-polymerizing resin cement, a light-polymerizing resin cement, and a preheated composite resin (N=420). Color values were measured by using spectrophotometry. Specimens were subjected to thermocycling (5°C and 55°C; 5000 cycles). The measured color difference (ΔE) data were analyzed by using descriptive statistics. Normality of data distribution was tested by using the Kolmogorov-Smirnov test. Three-way and 1-way ANOVA followed by the Scheffé post hoc test and unpaired 2-sample Student t test were computed to determine the significant differences among the tested parameters (α=.05).
ΔE values were significantly influenced by the CAD-CAM material (η=0.85, P<.001) and the resin composite cement (η=0.03, P=.003) but were not influenced by thickness (P=.179). Significant interactions were present among thickness, cement, and CAD-CAM materials (P<.001). Vita Suprinity and GC Cerasmart showed significantly the lowest ΔE values (P<.001). The highest ΔE values were observed for IPS Empress CAD. The dual-polymerizing resin cement showed significantly lower ΔE values than the preheated composite resin (P=.003).
Restoration materials and composite resin cement types used for cementation influence the amount of color change due to aging.
树脂水门汀和计算机辅助设计与计算机辅助制造（CAD-CAM）修复体的颜色可能会随时间老化而改变。
本体外研究的目的是分析热循环对具有底层树脂水门汀的 CAD-CAM 材料颜色的影响。
将七种不同的 CAD-CAM 材料、复合树脂和玻璃陶瓷切割成 0.7mm 和 1.2mm 厚度（n=10），并用双固化树脂水门汀、光固化树脂水门汀和预热复合树脂（n=420）粘结。使用分光光度法测量颜色值。将样本进行热循环（5°C 和 55°C；5000 次循环）。使用描述性统计分析测量的颜色差异（ΔE）数据。使用 Kolmogorov-Smirnov 检验测试数据分布的正态性。计算三向和单向方差分析，然后进行 Scheffé 事后检验和未配对的 2 样本 t 检验，以确定测试参数之间的显著差异（α=0.05）。
ΔE 值受 CAD-CAM 材料（η=0.85，P<.001）和树脂复合水门汀（η=0.03，P=.003）的显著影响，但不受厚度（P=.179）的影响。厚度、水门汀和 CAD-CAM 材料之间存在显著的相互作用（P<.001）。Vita Suprinity 和 GC Cerasmart 显示出显著较低的 ΔE 值（P<.001）。IPS Empress CAD 观察到最高的 ΔE 值。双固化树脂水门汀显示出比预热复合树脂显著更低的 ΔE 值（P=.003）。
用于粘结的修复材料和复合树脂水门汀类型会影响因老化而导致的颜色变化量。
