Related Experiment Videos
Leakage patterns associated with glass-ionomer-based resin restorations
G Wieczkowski1, R B Joynt, E L Davis
1State University of New York at Buffalo, School of Dental Medicine.
Operative Dentistry
|January 1, 1992
Summary
Separating agents reduce microleakage in glass-ionomer cement (GIC) and resin systems. However, polymerization shrinkage forces can still cause bond failure between GIC and dentin, leading to microleakage.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Glass-ionomer cements (GICs) are widely used in dentistry.
- Resin-based materials are also common restorative options.
- Understanding interfacial integrity is crucial for long-term restorations.
Purpose of the Study:
- To compare microleakage in GIC-resin systems with and without a separating agent.
- To investigate the effect of separating agents on interfacial sealing.
- To evaluate the influence of polymerization shrinkage on GIC-dentin bonds.
Main Methods:
- Specimens of GIC-resin systems were prepared with and without a separating agent.
- Microleakage was assessed at the dentin-GIC and GIC-resin interfaces.
- Statistical analysis was performed to compare leakage between groups.
Main Results:
- 100% leakage occurred at the dentin-GIC interface without a separating agent.
- With a separating agent, 10% leakage was observed at the dentin-GIC interface.
- 40% leakage was noted at the GIC-resin interface when a separating agent was used.
Conclusions:
- Polymerization shrinkage forces exceed the chemical bond strength between GIC and dentin.
- Separating agents improve interfacial sealing but do not eliminate leakage entirely.
- Bond failure at the GIC-dentin interface during resin polymerization compromises retention and creates leakage pathways.