This study aimed to examine the surface roughness and microhardness of several glass ionomers based restorative materials under the influence of exposure to variable pH solutions.Due to the chemical adhesion to tooth structure and fluoride release conventional glass ionomer has been highly used in the world of dentistry. On the other hand it has many limiting properties like high wear, low fracture strength and moisture sensitivity which led to do further modifications to the material like modification in powder to liquid ratio,other modification is the addition of metal particles(Kramer and Frankenberger, 2001) (Upadhya and Kishore,2005) (Hentegrakool et al,2011)(Bala et al 2012)In the current study silver reinforced glass ionomer ketac silver was used. The ketac silver contain silver-tin alloy fibers or flakes sintered to the glass-particles for a better incorporation of the metal particles into the cement matrix. This should increase the mechanical proprieties but conventional glass ionomer still having the best properties and clinical performance due to dense highly packed glass particles of different size (xie et al 2000) (Kramer and Frankenberger 2001)A zinc modified glass ionomer Chem Fill rock was used in the current study, and as the manufactur claims that Chem Fill rock have superior mechanical than conventional glass ionomer not only due to the presence of zinc particle but also due to the presence of high molecular weight acrylic resin monomer (Zoergiebel and Ilie, 2013 a)( Zoergiebel and Ilie, 2013 b )( Menne-Happ and Ilie 2014). On the other hand, Al angari et al 2014 found that zinc modified glass ionomer has no superior properties due to the filler size and the uneven distribution of the zinc particles.