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Marginal closure of non-gamma2 amalgam
The Bulletin of Tokyo Medical and Dental University
|September 1, 1978
Summary
Burnishing significantly reduces marginal leakage in dental amalgam restorations. High-copper amalgams showed less leakage after burnishing compared to conventional spherical types.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Dental amalgam restorations are widely used.
- Marginal integrity is crucial for restoration longevity.
- Microleakage can lead to secondary caries and pulpal issues.
Purpose of the Study:
- To evaluate the impact of burnishing on marginal leakage in different types of dental amalgam.
- To compare the effectiveness of burnishing across high-copper, conventional lathe-cut, and conventional spherical alloys.
Main Methods:
- Three amalgam alloys (high-copper, conventional lathe-cut, conventional spherical) were prepared and placed in transparent plastic cavities.
- Specimens were divided into burnished and unburnished groups.
- Dye penetration was used to assess marginal leakage after 24 hours.
Main Results:
- Burnishing significantly reduced marginal leakage for all tested amalgam types.
- Burnished high-copper amalgam exhibited less leakage than conventional spherical amalgam.
- Lathe-cut amalgam showed the least marginal leakage after burnishing.
Conclusions:
- Burnishing is an effective technique for improving the marginal seal of dental amalgam restorations.
- The effectiveness of burnishing varies among different amalgam alloy compositions.
- Setting dimensional change characteristics likely influence the marginal sealing properties of amalgams.