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Related Experiment Videos

Microleakage evaluation in amalgam restorations used with bases.

G Wieczkowski1, X Y Yu, R B Joynt

  • 1School of Dental Medicine, State University of New York at Buffalo.

Journal of Esthetic Dentistry
|March 11, 1992
PubMed
Summary

Using glass-ionomer bases under amalgam fillings significantly reduces marginal leakage, preventing secondary caries. Dual-cure resin-based systems offered the best protection against microleakage in dental restorations.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Caries Prevention

Background:

  • Marginal leakage in amalgam restorations is a precursor to secondary caries.
  • Improving the marginal seal of amalgam restorations is crucial for caries prevention.
  • Glass-ionomer bases offer a potential method to enhance the marginal seal of amalgam restorations.

Purpose of the Study:

  • To compare the microleakage resistance of amalgam restorations placed with and without light-cured glass-ionomer bases.
  • To evaluate the effectiveness of different base materials in preventing microleakage at the cavity wall/base and amalgam/base interfaces.

Main Methods:

  • Extracted human molar teeth were prepared and divided into four groups.
  • Groups included restorations with copal varnish (control) and various light-cured glass-ionomer bases.

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  • All specimens were restored with amalgam and subjected to microleakage assessment.

    • Main Results:

    • Restorations with copal varnish showed significantly greater leakage at the cavity wall/base interface compared to glass-ionomer bases.
    • Significant leakage differences were observed at the amalgam/base interface among the tested bases.
    • Dual-cure resin-based systems demonstrated minimal leakage at both interfaces, yielding the best results.

    Conclusions:

    • Light-cured glass-ionomer bases are effective in preventing microleakage in amalgam restorations.
    • Dual-cure resin-based systems provide superior marginal sealing compared to traditional materials.
    • The use of appropriate bases can significantly reduce the risk of secondary caries associated with amalgam restorations.