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Abstract
Purpose
The aim of this study was to evaluate the effect of mechanical, chemical surface treatments on the zirconia-to-resin cement shear bond strength (SBS).
Materials and methods
Eighty zirconia discs (Lava, 3M ESPE) and eighty zirconia/alumina composite (Zirace, Acucera) were embedded in an epoxy resin base. Zirconia discs were randomly divided in to four treatment groups(10 for each manufacturer): 50 μ m Al2O3 sandblasting (S50),110 μ m Al2O3 sandblasting (S110), 50 μ m Al2O3 and primer (Z-Prime Plus, Bisco Inc) (S50z) and 110 μ m Al2O3 and primer (Z-Prime Plus) (S110z). Two resin-based luting cements (Calibra, Panavia F) were used to build 2 mm-diameter cylinders onto the zirconia. After 24 h of storage in water, SBS testing was evaluate using a universal testing machine. Bond strength data were analyzed with one-way ANOVA, two-way ANOVA test and post hoc comparison was done using Tukey test (α = .05).
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 | Fig. 5.SEM image of Lava after sandblasting (magnification ×1,000). The roughness of the surface is suitable for the mechanical interlocking between zirconia and resin cement. A: 50 μ m Al2O3 sandblasting, B: 110 μ m Al2O3 sandblasting. |
 | Fig. 6.SEM image of Zirace after sandblasting (magnification ×1000). The pattern morphology is similar between 50 μ m Al2O3 sandblasting (A) and 110 μ m Al2O3 sandblasting (B). A: 50 μ m Al2O3 sandblasting, B: 110 μ m Al2O3 sandblasting. |
 | Fig. 7.SEM image of failure mode (magnification ×100). A: Adhesive failure mode, B: Mixed failure mode. |
Table 1.
Experimental materials
Table 2.
Ex perimental gro ups
Table 3.
Shear bond strength means in MPa (SD) by resin cement and surface treatment
Table 4.
Failure mode after SBS testing
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