Liner effect on the bond strength of feldspathic ceramic to zirconia using a slow cooling protocol
DOI:
https://doi.org/10.17533/udea.rfo.v27n1a3Keywords:
Zirconia, Ceramics, LinerAbstract
Introduction: the aim of this study was to compare the influence of a liner on veneering porcelain bond strength to two zirconia systems using a slow cooling protocol. Methods: twenty zirconia blocks were fabricated (12 x 11 x 4 mm), sintered, and layered with a veneering porcelain (5 x 11 x 4 mm, IPS e.max Ceram, Ivoclar Vivadent) using a slow cooling protocol. Four groups were evaluated: IPS e.max ZirCAD (Ivoclar Vivadent) with liner (IL) and without liner (IX), and Ecco-Zirconia (Amann Girrbach) with liner (EL) and without liner (EX) liner. Shear bond strength (SBS) test was conducted and failure modes were recorded. Results: the one-way ANOVA test yielded no significant statistical differences among the four groups (p = 0.662). The mean SBS values (±SD) in MPa were 15.2 (±1.7) MPa for EX, 15.3 (±2.0) MPa for EL, 16.4 (±4.2) MPa for IX, and 13.5 (±1.4) MPa for IL. All the samples showed a combined adhesive/cohesive failure. Conclusions: application of a liner did not alter the bond strength between veneering porcelain and zirconia when using a slow cooling protocol. No differences were found among the tested zirconia blocks.
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