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Assessing microleakage at the junction between amalgam and composite resin: a new method in vitro
F Hadavi1, J H Hey, E R Ambrose
1University of Saskatchewan, College of Dentistry, Saskatoon, Canada.
Operative Dentistry
|January 1, 1991
Summary
Applying bonding agent directly to roughened amalgam minimizes microleakage between amalgam and composite resin. Acid-etching the amalgam before bonding agent and composite placement resulted in the highest microleakage, indicating a crucial factor in dental restoration integrity.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
Background:
- Microleakage at the interface of dental restorations can compromise longevity and lead to secondary caries.
- Understanding factors influencing microleakage between amalgam and composite resin is critical for improving clinical outcomes.
Purpose of the Study:
- To evaluate microleakage between amalgam and composite resin using a novel dye-diffusion test.
- To investigate the impact of surface preparation and bonding agent application on microleakage.
Main Methods:
- A new dye-diffusion test method was employed.
- Amalgam cylinders were prepared with a composite resin base.
- The effects of roughening, acid-etching, and bonding agent application on microleakage were assessed.
Main Results:
- Less microleakage was observed when a bonding agent was applied directly to the roughened amalgam surface before composite resin placement.
- The highest level of microleakage occurred when the roughened amalgam surface was acid-etched prior to bonding agent and composite resin application.
Conclusions:
- Direct application of bonding agent to roughened amalgam is effective in reducing microleakage.
- Acid-etching amalgam surfaces before bonding agent and composite placement should be avoided to minimize microleakage.