Glass Ionomer Cement

Question 1

What are the uses for GIC?

Answer 1

1. Restorative
   - -> filling material = Riva, Vitremer
2. Core build up
   - -> prior to crown rest = Vitremer Crown Core
3. Lining
   - -> underneath def rests = Vitrebond, Ionoseal
4. Luting
   - -> Cementing indirect restorations = Fuji Luting, Vitremer luting cement, AquaCem
5. Fissure sealant
6. Temp filling (endo access cavity)

Question 2

What are the phases of setting reaction for conventional GIC?

Answer 2

1. Dissolution
2. Gelation
3. Hardening

Question 3

What are the implications of saliva contamination during the setting of conventional GIC?

Answer 3

Absorption of water –> weakens –> rough, break up, poorer aesthetics

Question 4

What must be placed following conventional GIC placement? And why?

Answer 4

• Varnish = copal ether, acetate
• Resins = DBA/EBA, unfilled bis-GMA resins
• Greases = petroleum jelly

Prevents surface damage due to drying

Question 5

What are the advantages of conventional GIC?

Answer 5

• Stable bond to enamel and dentine
• Low microleakage
• F release
• Good thermal properties
• No contraction on setting

Question 6

What are the disadvantages of conventional GIC?

Answer 6

• Brittle
• Poor wear resistance
• Poor handling
• Poor aesthetics
• Sensitive to: moisture when placing, acid and drying over time
• Etch damages surface; bonding to comp…?

Question 7

What are the advantages of RMGIC over conventional?

Answer 7

• Stronger
• Lower solubility
• Better aesthetics
• Better handling
• Command set

Question 8

What are the disadvantages of RMGIC compared to conventional?

Answer 8

• Polymerisation contraction
• Exothermic reaction
• HEMA; swells due to water uptake, toxic to pulp
• Compromised strength if not light cured