الفهرس 
CONTENTSOnly 14 pages are availabe for public view
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Abstract
Enhance the bonding of cement to ceramic surface with a variety of ceramic surface modifications have been established. Air-abrasion using alumina particles, hydrofluoric acid has been shown to provide micromechanical interlocking at the ceramic-resin interface`
The aim of the present study was to evaluate the effect of two surface treatments; acid etching and sandblasting; on the shear bond strength of cemented newly introduced zirconia-reinforced lithium silicate ceramics following thermocycling.
Methods 24 discs of Zirconia- reinforced glass ceramics (celtra duo) were tested using 10% hydrofluoric acid for 20 seconds (control group) and 50 μm aluminum oxide for 60 seconds at 10mm distance from the nozzle tip of sandblasting machine. Subsequent the surface treatments both groups were salinized and cemented to composites background discs using self-adhesive duel cure resin cement (BisCem). All sample were subjected to 2500 thermal cycle shear bond strength and failure mode was evaluated
The results of t- test indicated that the bond strength value is significantly influenced by the surface treatment method. It was found that hydrofluoric acid group recorded statistically significantly higher shear bond strength mean value (10.81 MPa) than aluminum oxide sandblasting group (7.76 MPa) as indicated by t-test (t=2.9, P=0.0109<0.05). failure mode showed a relation between the bond strength and the failure type mixed failure showed with higher bond valves and cohesive failure accompanied with lowest bond strengthen values
Conclusion the Shear bond strength of zirconia reinforced lithium silicate (celtra Duo) ceramic cemented to resin cement was affected by the type of surface treatment.