EFFECTS OF COLORING PROCEDURES ON SHEAR BOND STRENGTH BETWEEN RESIN CEMENT AND COLORED ZIRCONIA
Purpose: Debonding is a common failure in restorations with a zirconium core. The aim of this study is to evaluate the shear bond strength between resin cement and colored zirconium oxide core materials.
Materials and Methods: Zirconium discs (15 mm x 12 mm x 1.6 mm) were divided into 11 groups of 12 discs each. Groups were colored according to the VITA classical shade scale: A3, B1, C4, D2, and D4. Each group was colored for the duration of either 3 seconds or 60 seconds. The control group was not treated. Samples were then bonded to 3 mm thick and 3 mm wide translucent resin cement. These samples were subjected to shear test in a universal testing machine with a crosshead speed of 1 mm per minute. Two-way analysis of variance (ANOVA) and Tukey's HSD test were used for pairwise comparisons. A paired t-test was used for groups of the same color but having different shading times.
Results: Shear bond strength did not vary significantly depending on color and shading times. Among 11 study groups, B1 (60 seconds of coloring) had the highest bond strength (10.05 MPa), while A3 (60 seconds of coloring) showed the lowest bond strength (6.72 MPa). However, these differences were not found to be statistically significant.
Conclusion: The coloring procedures applied in this study did not affect the shear bond strength between resin cement and zirconia.
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