• Niger J Clin Pract · Nov 2019

    Evaluation of shear bond strength of zirconia-based monolithic CAD-CAM materials to resin cement after different surface treatments.

    • B Altan, S Cinar, and B Tuncelli.
    • Department of Prosthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
    • Niger J Clin Pract. 2019 Nov 1; 22 (11): 1475-1482.

    ObjectiveTo compare the shear bond strength of resin cement to zirconia-based monolithic CAD-CAM materials subjected to different surface treatments.Methods2 brands of monolithic zirconia blocks (Vita YZ HT, Sirona inCoris TZI), yttrium-stabilized tetragonal zirconia (IPS e.max ZirCAD) and zirconia-reinforced lithium silicate ceramic (Vita Suprinity) were divided into six groups according to the surface treatment received: no treatment (control), HF acid etching, sandblasting, sandblasting + Er:YAG laser irradiation, Er:YAG laser irradiation and CoJet. Composite resin cylinders were bonded to blocks with self-adhesive resin cement (Theracem). Shear bond strength was evaluated after thermocyling. Failure modes were examined using SEM. Data was analyzed statistically by using 2-way ANOVA and post-hoc Tukey's test (P < 0,05).ResultsThe bond strength was significantly affected by the surface treatment and the type of CAD-CAM blocks (P < 0,001). Surface treatment with CoJet revealed significantly higher bond strength compared to sandblasting in Y-TZP and monolithic zirconia specimens.ConclusionsMonolithic zirconia blocks showed higher bond strength values compared to Y-TZP zirconia block in sandblasting and CoJet groups. HF acid etching is more effective than sandblasting and CoJet for Vita Suprinity.

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