Glass Ionomer & RMGI Cements
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About glass ionomer & RMGI cements
A glass ionomer cement is powder and liquid mixed before use; a resin-modified glass ionomer (RMGI) joins the strength of polymers to its fluoride release. The powder is mostly calcium fluoroaluminosilicate glass, and the liquid is usually an aqueous solution of polyacrylic acid copolymers. It holds to the tooth by ionic bonds between the carboxyl groups of the cement and the calcium and phosphorus of enamel and dentine apatite. A resin-modified glass ionomer joins the strength and insolubility of polymers to the fluoride release and adhesion of a glass ionomer, and bonds more strongly to dentine because of its composite part. The ADA notes that resin-modified glass ionomers set faster than conventional ones and can be light-cured or self-cured.
Water-based, and it releases fluoride. The resin-modified kind sets by an acid-base reaction and by polymerisation together, and ISO 9917-2 is the standard for those.
Sources: Heboyan et al. 2023, Dental Luting Cements: An Updated Comprehensive Review (Molecules) · ADA Oral Health Topics: Materials for Direct Restorations · ISO 9917-2:2017, Dentistry — Water-based cements — Part 2: Resin-modified cements