GLASS IONOMER CEMENTa. Refractive index ー close to that of enamel.b. Thermal expansion ＝tooth structures thermal expansionc. Most pediatric restorative material ー most common.d. Compared to composite has more polymerisation shrinkageLIQUID ー polyacrylic acid ✱Polishing:- Aluminium oxidei. Bond ー chemicallyii. Adhesiveiii. 10 second surface conditioning / etchingiv. Has macromolecules ∴ biocompatiblePOWDER ー Al,Ca ,F ー SiO2 , Al2O3, CaFli. Fluoride release - anti-cariogenic propertyii. Fluoride helps in - ceramic flux (AlF,CaF all detaches)iii. Maturation [complete setting of GIC]- 24 HOURS.iv. After 24 hours GIC needs wetness for its stabilityv. Dry oral cavity [xerostomia, mouth breathers, radiation]- contra-indicated.

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