GLASS IONOMER CEMENT

a. Refractive index ー close to that of enamel.
b. Thermal expansion ＝tooth structures thermal expansion
c. Most pediatric restorative material ー most common.
d. Compared to composite has more polymerisation shrinkage

LIQUID ー polyacrylic acid ✱Polishing:- Aluminium oxide
i. Bond ー chemically
ii. Adhesive
iii. 10 second surface conditioning / etching
iv. Has macromolecules ∴ biocompatible

POWDER ー Al,Ca ,F ー SiO2 , Al2O3, CaFl
i. Fluoride release - anti-cariogenic property
ii. 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 stability
v. Dry oral cavity [xerostomia, mouth breathers, radiation]- contra-indicated.