Materials
Glass Ionomer
A tooth-coloured filling material that bonds chemically to enamel and releases fluoride.
Glass ionomer cements are made from a fluoroaluminosilicate glass powder mixed with a polyacrylic acid liquid. Once placed, they bond chemically to both enamel and dentin without needing a separate adhesive, and they slowly release fluoride into surrounding tooth structure, which can help prevent recurrent decay. Glass ionomers are weaker and less wear-resistant than composite resin, so they are typically used in low-stress areas: as a base under larger restorations, in baby teeth, on root surfaces, and as a temporary or transitional filling. Resin-modified versions improve strength and aesthetics.