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موضوع: Thermo and mechanical cycling and veneering method do not influence Y-TZP core/veneer interface bond strength

  1. #1

    تاریخ عضویت
    July 2009
    رشته
    مهندسی شیمی
    نوشته ها
    514
    پسندیده
    0

    [ مورد پسند: 46 بار در 33 پست ]

    پیش فرض Thermo and mechanical cycling and veneering method do not influence Y-TZP core/veneer interface bond strength

    a b s t r a c t
    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 0.5 mm/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.
    a r t i c l e i n f o
    Article history:
    Received 27 June 2012
    Received in revised form
    27 November 2012
    Accepted 4 December 2012
    Keywords:
    Zirconia
    Porcelain
    Shear bond strength
    Mechanical cycling
    Thermal cycling

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