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  • Title: Thermo and mechanical cycling and veneering method do not influence Y-TZP core/veneer interface bond strength.
    Author: Vidotti HA, Pereira JR, Insaurralde E, de Almeida AL, do Valle AL.
    Journal: J Dent; 2013 Apr; 41(4):307-12. PubMed ID: 23238305.
    Abstract:
    OBJECTIVES: The purpose of this study was to evaluate the influence of thermal and mechanical cycling and veneering technique on the shear bond strength of Y-TZP (yttrium oxide partially stabilized tetragonal zirconia polycrystal) core-veneer interfaces. MATERIALS AND METHODS: Cylindrical Y-TZP specimens were veneered either by layering (n=20) or by pressing technique (n=20). A metal ceramic group (CoCr) was used as control (n=20). Ten specimens for each group were thermal and mechanical cycled and then all samples were subjected to shear bond strength in a universal testing machine with a 0.5mm/min crosshead speed. Mean shear bond strength (MPa) was analysed with a 2-way analysis of variance and Tukey's test (p<0.05). Failure mode was determined using stereomicroscopy and scanning electron microscopy (SEM). RESULTS: Thermal and mechanical cycling had no influence on the shear bond strength for all groups. The CoCr group presented the highest bond strength value (p<0.05) (34.72 ± 7.05 MPa). There was no significant difference between Y-TZP veneered by layering (22.46 ± 2.08 MPa) or pressing (23.58 ± 2.1 MPa) technique. Failure modes were predominantly adhesive for CoCr group, and cohesive within veneer for Y-TZP groups. CONCLUSIONS: Thermal and mechanical cycling, as well as the veneering technique does not affect Y-TZP core-veneer bond strength. CLINICAL SIGNIFICANCE: Different methods of veneering Y-TZP restorations would not influence the clinical performance of the core/veneer interfaces.
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