Glass Ionomer Cement (GIC)
GIC is formed by an acid–base reaction between fluoroaluminosilicate glass and polyacrylic acid. It uniquely chemically bonds to tooth structure and releases fluoride (anticariogenic).
Types (Wilson & McLean)
- Type I — luting (cementation).
- Type II — restorative.
- Type III — liner/base.
Resin-Modified GIC (RMGIC)
Adds resin (HEMA) for command set and improved strength/esthetics while retaining fluoride release and adhesion.
Properties
Biocompatible (low pulpal irritation), coefficient of thermal expansion similar to tooth, but lower wear resistance/strength than composite — moisture-sensitive during initial set.
Exam Tips ⭐
GIC = chemical bond + fluoride release; Type I luting, II restorative, III liner; RMGIC = resin-added.
📝 Practice MCQs — Glass Ionomer Cement
Q1. A unique property of GIC is:
A. No fluoride release
B. Chemical adhesion to tooth + fluoride release
C. High wear resistance
D. Opacity only
Show Answer
✅ Answer: B
GIC chemically bonds to tooth and releases fluoride.
Q2. Type I GIC is used for:
A. Restoration
B. Luting (cementation)
C. Liner
D. Pit & fissure sealant
Show Answer
✅ Answer: B
Type I GIC is a luting cement.
Q3. Resin-modified GIC contains:
A. Zinc oxide
B. HEMA resin for command set
C. Eugenol
D. Gold
Show Answer
✅ Answer: B
RMGIC incorporates resin (HEMA) for light-cured set and strength.
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Related Topics
Composite Resins — Types & PropertiesDental Cements — ZPC, GIC, ResinDental Bonding Agents — Generations