Unsintered zirconia specimens were subjected to air abrasion using a sandblast machine with aluminum oxide (Al2O3) particle size of 30 μ for 15 s at a 10 mm distance from the surface and with a pressure of 0.4 bar. The specimens were then cleaned in 96% isopropyl alcohol for 3 min ultrasonically and steam-cleaned for 15 s. The 30 specimens were then subjected to sintering at 1300°C for 8 h (following the manufacturer's instructions). These specimens were then layered with veneering zirconia and shear bond strength (SBS) was assessed.
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