 Glass-ionomer cement is a type of dental material used in dentistry. It is composed of a mixture of glass powder and acrylic monomer, which sets quickly due to an acid-base reaction. The resulting material has good physical properties and is biocompatible, allowing it to bond to teeth and release fluoride. Resin-modified glass-ionomers and glass-carbon are two modified versions of glass-ionomer cement. Resin-modified glass-ionomers contain a resin component, while glass-carbon contains a carboxylic acid component. Both types of modified glass-ionomers cement have similar physical properties as traditional glass-ionomers cement, but may have different levels of biocompatibility. This article was authored by Sharon Burkay-Sadu and John W. Nicholson.