A glass ionomer cement is a dental restorative material used in dentistry as a filling material and luting cement,[1] including for orthodontic bracket attachment.[2] Glass-ionomer cements are based on the reaction of silicate glass-powder (calciumaluminofluorosilicate glass[3])and polyacrylic acid, an ionomer. Occasionally water is used instead of an acid,[2] altering the properties of the material and its uses.[4] This reaction produces a powdered cement of glass particles surrounded by matrix of fluoride elements and is known chemically as glass polyalkenoate.[5] There are other forms of similar reactions which can take place, for example, when using an aqueous solution of acrylic/itaconic copolymer with Tartaric acid, this results in a glass-ionomer in liquid form. An aqueous solution of maleic acid polymer or maleic/acrylic copolymer with tartaric acid can also be used to form a glass-ionomer in liquid form.