Effect of Silane on the Resin Cements/Zirconia-Reinforced Lithium-Silicate Bond Strength

Objectives: This study evaluated the effect of silane on the bond strength of resin cements used in combination with universal adhesives to zirconia-reinforced lithium-silicate(ZLS).
Methods: Forty 12mm x 14mm x 5mm ZLS (Celtra duo, Dentsply, shade A3 LT) were fabricated. The specimens were embedded into acrylic resin. The surface of the specimens was etched (5% HF, 30s). The specimens were randomly divided into 4 groups (n=10/gp); Group A, Single bond universal (SBU, 3M ESPE); Group B, Silane (S, Porcelain primer, Bisco) and SBU; Group C, All-bond universal (ABU, Bisco); Group D, S and ABU. A pre-cured composite-resin cylinder with a diameter of 0.8mm was bonded to treated ZLS using dual-cure resin cement (Group A,B: RelyX ultimate (3M ESPE); Group C,D: Duo-link universal (Bisco)). The specimens were stored (37°C water, 24h) and subjected to μSBS test. The data were statistically analyzed (ANOVA, Turkey’s, p<0.05).
Results: Group B (22.48±3.98MPa) showed a significantly higher bond strength than group A (17.47±3.54MPa). Group D (23.08±5.10MPa) showed a significantly higher bond strength than group C (17.13±4.37MPa) (p<0.05).
Conclusions: 1. The silane contained in SBU was not effective in optimizing the resin cement/ZLS bond than separate silane.
2. The silane treatment prior to applying the universal adhesive significantly improved the bond strength between resin cement and ZLS.