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Objective: To assess the influence of sandblasting parameters (applied pressure and grain particle size) on the microshear bond strength (μSBS) of Vita Enamic (VE) CAD/CAM hybrid ceramic to two different resin cements. Materials and Methods: One-hundred VE specimens were fabricated and allocated to 5 pretreatment groups (n=20/group): no treatment, 50 μm Al2O3 (2 bar), 50 μm Al2O3 (3.5 bar), 110 μm Al2O3 (2 bar) and 110 μm Al2O3 (3.5 bar). After pretreatment, surface roughness (Ra) was determined using a profilometer. The topography of pretreated surfaces was examined with Scanning Electron Microscopy (SEM). Each group was further divided into two subgroups according to type of luting material; subgroup (a): G-CEM LinkAce and subgroup (b): Single bond universal and RelyX Ultimate. After bonding, μSBS was measured with a Universal Testing Machine. Data were statistically analyzed using ANOVA and Tukey HSD tests (α=.05). Results: Specimens air-abraded with 110 μm Al2O3 and pressure 2 bar showed the highest but insignificant μSBS compared to other sandblasted groups (P 50 μm (2 bar) > 110 μm (3.5 bar) > 50 μm (3.5 bar) > control. Regardless the Al2O3 size, μSBS improved when sandblasting pressure was 2 bar while decreased with 3.5 bar groups. RelyX Ultimate showed higher μSBS than G-CEM LinkAce. Conclusions: Sandblasting of VE surface by (2 bar) pressure and the use of conventional resin cement in association with universal adhesive system were required to achieve satisfactory bond strength values.

Influence of sandblasting parameters and luting materials on microshear bond strength to a CAD/CAM hybrid ceramic material