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Related Experiment Videos

Microleakage in bonded amalgam restorations using different adhesive materials.

Maximiliano Sérgio Cenci1, Evandro Piva, Fernando Potrich

  • 1School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.

Brazilian Dental Journal
|August 24, 2004
PubMed
Summary

Bonded amalgam restorations effectively prevent microleakage, especially with resin-modified glass-ionomer cement. All tested materials outperformed the control, showing promise for durable dental restorations.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials Engineering

Background:

  • Microleakage is a significant concern in bonded amalgam restorations, potentially leading to secondary caries and pulp inflammation.
  • Evaluating the efficacy of various adhesive materials in preventing microleakage is crucial for improving restoration longevity.

Purpose of the Study:

  • To assess the microleakage prevention capabilities of different adhesive materials used with bonded amalgam restorations.
  • To compare the performance of glass-ionomer cement, resin cements, and an adhesive system against a control.

Main Methods:

  • Standard cavities were prepared in bovine incisors with gingival margins in cementum/dentin and occlusal margins in enamel.
  • Teeth were restored using five different materials: glass-ionomer cement, two resin cements, an adhesive system, and Copalex varnish (control).

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  • Restorations underwent thermal cycling, followed by methylene blue dye immersion and sectioning for microleakage assessment.

    • Main Results:

    • All tested materials significantly reduced microleakage compared to the control group (p<0.01).
    • Resin-modified glass-ionomer cement showed no microleakage, significantly outperforming other adhesives (p<0.05).
    • Microleakage was consistently lower at enamel margins than at cementum/dentin margins.

    Conclusions:

    • Bonded amalgam restorations represent an effective technique for preventing microleakage.
    • All evaluated materials demonstrated superior performance over the control in sealing enamel and cementum/dentin margins.
    • Resin-modified glass-ionomer cement offers excellent protection against microleakage in bonded amalgam restorations, particularly at challenging cementum/dentin interfaces.