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Gurdal, Isil; Atay, Ayse; Eichberger, Marlis; Cal, Ebru; Usumez, Aslihan; Stawarczyk, Bogna (2018): Color change of CAD-CAM materials and composite resin cements after thermocycling. In: Journal of Prosthetic Dentistry, Vol. 120, No. 4: pp. 546-552
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Statement of problem. The color of resin cements and computer-aided-design and computeraided-manufacturing (CAD-CAM) restorations may change with aging. Purpose. 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. . Material and methods. 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 degrees C and 55 degrees C;5000 cycles). The measured color difference (Delta E) 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 Scheffe post hoc test and unpaired 2-sample Student t test were computed to determine the significant differences among the tested parameters (alpha=.05). Results. Delta E values were significantly influenced by the CAD-CAM material (eta(2)(p)=0.85, P<.001) and the resin composite cement (eta(2)(p)=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 Delta E values (P<.001). The highest Delta E values were observed for IPS Empress CAD. The dual-polymerizing resin cement showed significantly lower Delta E values than the preheated composite resin (P=.003). Conclusion. Restoration materials and composite resin cement types used for cementation influence the amount of color change due to aging.