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JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, vol.35, no.18, pp.1981-1994, 2021 (SCI-Expanded)
This in vitro study aimed to investigate the bond strength and discoloration between the zirconia framework and veneer ceramic applied after liner and argon plasma treatment with two different techniques. A total of 200 zirconium substructures of 12 mm length, 10 mm width, and 0.7 mm thickness were divided into five subgroups for the application of different thicknesses of liner: C (no liner application), L1 (0.1 mm), L2 (0.2 mm), L3 (0.1 mm + 0.1 mm) and LA (0.1 mm + 0.1 mm + argon plasma). The zirconia substructures were fabricated by two different techniques (A: layering, B: press-on). The specimens of the three subgroups Control, Group L3, and Group LA were tested for color difference. Color parameters were measured using a spectrophotometer before and after thermal cycling, and differences (CIEDE 2000 [Delta E-00]) were calculated. The shear bond strength was applied to all subgroups using a universal testing machine. The data were analyzed statistically using the Shapiro-Wilk, Levene, and Kruskal-Wallis tests. The interface and fractured surfaces of the specimens were also evaluated by scanning electron microscopy (SEM). Significant differences were found between the groups (p < 0.05) in terms of shear bond strength and color differences (p < 0.001). Group LA showed significantly higher bond strength and color stability than the other groups (p < 0.001). The results of the study demonstrated that the application of liner and argon plasma between the upper and lower structures of all-ceramic systems significantly affects the bond strength and final colour of the restorations.