الفهرس 
Shear bond strength of zinc modified glass ionomer versus nanofilled resin modified glass ionomer to dentin with and without conditioning
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Abstract
Aim: evaluate the effect of different surface treatment to dentin on shear bond strength of Zinc modified glass ionomer compared to Nano-filled resin modified glass ionomer and assessment of tooth restoration interface using environmental scanning electron microscope. Materials and Methods: Zinc modified glass ionomer (Chemfil Rock), Nano-filled resin modified glass ionomer (Ketac{u2122} N100), Dentin conditioner (Ketac N100 primer) and artificial saliva solution was prepared. Eighty eight sound human premolars were used. Each tooth was individually embedded vertically in the resin mix; occlusal surface was grounded flat then the specimens were stored in saline till the application of different glass ionomer. The two types of glass ionomer were applied with and without Ketac N100 primer on the prepared specimens then shear bond strength test were performed at 24 hours and one month. The tested specimens were photographed using Digital microscope to determine mode of failure while for interfacial analysis SEM was used. Results: It was found that Ketac{u2122} N100 without dentin conditioning at 24 hours had the lowest mean shear bond test (SBS) while Chemfil Rock without dentin conditioning at 24 hours had the highest mean shear bond test. The predominant mode of failure in all specimens was adhesive mode of failure. SEM evaluation revealed a gap between Ketac{u2122} N100 and underlying dentin while no gap between Chemfil Rock and unconditioned dentin but with dentin conditioning a gap was found between the Ketac N100 primer and Chemfil Rock