Influence of Y-TZP ceramic treatment and different resin cements on bond strength to dentin

ObjectivesEvaluating the bond strength (σ) of resin cement systems (RXA – RelyX ARC; RXU – RelyX U100; and PF – Panavia F) to dentin and yttria-stabilized zirconia-based ceramic (YZ – In-Ceram YZ) after different surface treatments and aging.MethodsOcclusal dentin of 54 human molars was exposed and conditioned following manufacturers’ instructions. Fifty-four YZ blocks were sintered and divided into two groups according to surface treatment: PA – airborne particle abrasion, and SC – tribochemical silica coating. All treated YZ blocks were cemented to dentin using one of the cement systems (RXA, RXU, and PF) following manufacturers’ recommendations, which includes specific silane agents. Teeth-cement-ceramic blocks were stored in 37 °C distilled water for 24 h before cutting into non-trimming bar-shaped specimens (adhesive area, A = 1 ± 0.1 mm2). Specimens (n ≥ 12) were assigned to one of the following conditions: N – no storage; W – stored in 37 °C distilled water for 60 days; and TC – thermal cycling (5–55 °C; 10,000 cycles). All specimens were loaded in tension (F) to failure using a universal testing machine. The σ (F/A) was calculated and data were statistically analyzed using ANOVA and Tukey tests (α = 0.05). Fracture surfaces were examined to determine the failure mode.ResultsRXA-SC and PF-PA specimens showed the greatest mean σ values after N (13.9 and 13.0 MPa, respectively) and TC (12.9 and 14.8 MPa, respectively). SC-treated showed greater mean σ values than PA-treated YZ specimens after W.SignificanceRegardless of the cement used, W and TC did not significantly reduce the σ of SC-treated YZ resin bonded to dentin.