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Abstract
The aim of this in-vitro study is to assess the effect of two different priming agents on the shear bond strength (SBS) of composite resin used to repair zirconia compared to sandblasted zirconia. -Twenty four zirconia specimens (12{u00D7}10{u00D7}3 mm) were sliced from presintered zirconia blank using Isomet 98 machine then the specimens were sintered according to the manufacturer instructions. -The specimens were randomly divided into three groups according to the surface treatment performed; each group was 8 specimens as follow: group (1) (control group): The specimens were subjected to sandblasting with 110om Al2O3 particles. group (2) (RelyX group): The specimens were subjected to rely X ceramic primer. group (3) (monobond plus group): The specimens were subjected to Monobond Plus primer. The specimens of group1 (control group) were subjected to airborne-particle abrasion with 110 om Al2O3 particles from a distance of 10 mm at a pressure of 2.8 bar for 15 seconds. The specimens of group2 were treated with rely X ceramic Primer with a clean bonding brush in a homogenous rubbing motion and left for 1 minute then gently air dried for 5 seconds. The specimens of group 3 were treated with monobond plus primer with a clean bonding brush in a homogenous rubbing motion and left for 1 minute then gently air dried for 5 seconds. The Te-Econom universal adhesive was applied on all specimens, air dried gently for 5 seconds and light cured for 30 seconds. The adhesion procedures were performed according to the manufacturer{u2019}s recommendations