الفهرس 
Classification of glass ionomersOnly 14 pages are availabe for public view
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Abstract
Glass-ionomer cements (GICs) was originally invented by Wilson and Kent in the early 1970s.[1] GICs have now become a routine part of clinical practice for restorations, luting cements and lining materials. Apart from amalgam and resin composite, glass-ionomer cements have been gradually developed as another choice of an ‘easy-to use’ restorative material.[2] Main advantages of glass-ionomer materials include their good compressive strength, their ability to bond to the tooth structure without the use of any bonding agent and fluoride releasing potential, which may inhibit the progress of caries around the restoration.[3] However, the conventional materials showed some drawbacks like poor tensile, flexural strengths and suboptimal wear resistance, which precluded the use of these materials in load-bearing cavities.[4] In 1980s, resin-modified glass ionomer cement (RMGIC) was developed to overcome some of the problems of conventional GICs. RMGICs are glass-ionomer cements containing a resin monomer. They showed better mechanical properties and lower solubility, [5] but the presence of resin reduced the biocompatibility[3] and lead to lower fluoride ion releasing.[6] Also, volumetric shrinkage during polymerization of the RMGICs affected the bond strength of this material to dentin.