Objectives: The purpose of this in vitro study was to evaluate the effect of shade and thickness of porcelain on depth of cure of two light-cured luting cements with two different shades. Methods: Porcelain samples (Empress 2 -Ivoclar) were prepared in 1mm and 2mm thickness and 10mm diameter (shade 1M2, 2M2). The test materials (RelyX and Variolink II Base; A1 and A3 shade) were cured through the porcelain samples. Depth of cure measurements were performed according to ISO 4049. Statistical analyses were performed with Tukey HSD test. Results: The highest depth of cure results were obtained with Variolink II Base (A1) covered with Empress 2 1M2 shade at 1mm thickness as (3.051±0.04mm). Lowest depth of cure was obtained with Rely X (A3)covered with Empress 2 2M2 shade at 1.8 mm thickness (0.937±0.01mm)(A3)(p<0.05). Conclusion: Darker shade of the resin-based luting material is a significant factor on decreasing depth of cure, especially for RelyX. Thickness of porcelain material influenced the depth of cure more than the shade of porcelain.

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