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Microleakage of amalgam restorations with high-copper content
Journal of the American Dental Association (1939)
|August 1, 1979
Summary
High-copper amalgams showed varying microleakage over time, initially increasing then decreasing after six months. These dental materials performed similarly to conventional amalgams regarding marginal integrity.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Microleakage is a critical factor in the longevity of dental restorations.
- High-copper amalgams are widely used due to improved properties over conventional amalgams.
- Understanding marginal seal behavior is essential for clinical success.
Purpose of the Study:
- To evaluate the in vitro microleakage of Class II restorations using high-copper amalgams.
- To compare the microleakage patterns of different high-copper amalgam formulations.
- To assess the influence of time and cavosurface margin adaptation on microleakage.
Main Methods:
- In vitro study design.
- Class II restorations fabricated with various high-copper amalgams.
- Microleakage assessment at 24 hours, 1 month, and 6 months.
- Evaluation of leakage depth and correlation with margin adaptation.
Main Results:
- Marginal microleakage generally increased from 24 hours to 1 month, then decreased by 6 months.
- Initial differences in leakage among products at 24 hours were not significant at 6 months.
- Leakage depth did not correlate with the adaptation of cavosurface margins.
- High-copper amalgams exhibited comparable microleakage to conventional amalgams.
Conclusions:
- High-copper amalgams demonstrate a dynamic microleakage pattern over time.
- Long-term (6 months) microleakage is comparable across different high-copper amalgam types and conventional amalgams.
- Cavosurface margin adaptation is not a predictor of microleakage depth in these materials.