Glass Ionomer Cement
Also written as: GIC — Glass Ionomer Cement
A tooth-colored restorative and luting material that bonds chemically to tooth structure via polyacrylic acid and releases fluoride ions, used for restorations, liners, bases, and luting of prostheses.
Full Definition
Glass ionomer cement (GIC) is formed by the reaction between an alumino-silicate glass powder and an aqueous solution of polyacrylic acid, producing a hard matrix that bonds chemically to calcium in enamel and dentine without mechanical retention requirements. A key property is the sustained release of fluoride ions, providing a cariostatic effect at the tooth–restoration interface. Variants include conventional GIC, resin-modified GIC (RMGIC), and high-viscosity GIC used in ART. GIC has relatively low fracture toughness compared to composite resin, limiting its use in high-stress bearing areas. Editors should note that 'glass ionomer' may be written as a hyphenated compound or open compound depending on house style; the hyphenated form 'glass-ionomer cement' is common in British dental literature.
Usage
Usage note: Hyphenation of 'glass-ionomer' vs 'glass ionomer' varies by publication; verify house style. Always expand GIC on first use.
In Context
- "Glass ionomer cement was placed as a base beneath the composite restoration to provide fluoride release and thermal insulation." — Restorative dentistry clinical notes
- "The bracket was bonded using resin-modified glass ionomer cement to balance adhesion strength with fluoride release." — Orthodontic clinical audit