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Objective: To investigate the effect of sandblasting the zirconia liner on the microtensile bond strength of manually-layered and pressed veneers to zirconia
Materials and methods: Bilayered zirconia specimens were prepared from e.max®ZirCAD framework materials and divided into four groups (at least 30 specimens per group). Two veneering techniques were used: I. Layering technique (e.max®Ceram) for group 1 and group 2 and II. Press-on technique (e.max®ZirPress) for group 3 and group 4. ZirLiner was applied onto the zirconia surfaces in group 1 and 3 and fired according to the manufacturer’s instructions. Veneering of these specimens was then performed. The surfaces of group 2 and 4 were treated similarly to group 1 and 3, except that sandblasting with 50-μm aluminum oxide particles was performed on the fired liner material. The bilayered blocks were cut into microbars with 1mm x 1mm in cross-section. All specimens were loaded to fracture using a microtensile tester. The fracture surfaces were analyzed using a scanning electron microscope to identify the mode of failure.
Results: When the liner material was blasted, the mean microtensile bond strength (MTBS) of bilayered specimens in the layering group (14.5±2.7 MPa) and the press-on group (15.5±5.0 MPa) were significantly lower than those of unblasted liner groups (16.5±3.5 MPa for layering and 19.8±6.1 MPa for press-on). Most of the fractures occurring in all groups initiated at the zirconia-veneer interface.
Conclusions: Blasting the zirconia liner material decreased the bond strength between zirconia to layered and pressed veneers. Interfacial failure was predominantly observed in all groups.
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