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Composite resin-amalgam compound restorations

M Franchi1, P Trisi, G Montanari

  • 1Department of Restorative Dentistry, University of Bologna, Italy.

Quintessence International (Berlin, Germany : 1985)
|August 1, 1994
PubMed
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This study investigated a composite resin-amalgam technique for posterior teeth. While marginal adaptation was acceptable, microleakage varied across interfaces, with high leakage at the enamel-amalgam junction.

Area of Science:

  • Dental materials science
  • Restorative dentistry

Background:

  • Extensive silver amalgam restorations often necessitate sacrificing healthy tooth structure, including enamel walls and cusps.
  • This structural compromise can impact the longevity and integrity of posterior dental restorations.

Purpose of the Study:

  • To evaluate a novel posterior composite resin-amalgam compound technique designed to conserve healthy tooth structures.
  • To assess the microleakage and marginal adaptation of this compound technique.

Main Methods:

  • Utilized a posterior composite resin-amalgam compound technique.
  • Investigated microleakage at various interfaces: enamel-amalgam, composite resin-silver amalgam, dentin-composite resin, and inner enamel-composite resin.
  • Employed light microscopy and scanning electron microscopy (SEM) for detailed analysis.

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Main Results:

  • Microleakage was highest at the enamel-amalgam interface.
  • Moderate microleakage was observed at the composite resin-silver amalgam and dentin-composite resin interfaces.
  • Minimal microleakage occurred between the inner etched enamel and the composite resin.
  • SEM confirmed acceptable marginal adaptation between silver amalgam and composite resin on cusps.
  • Complete penetration of the inner etched enamel by the composite resin was verified.

Conclusions:

  • The composite resin-amalgam compound technique shows potential for conserving tooth structure in posterior restorations.
  • Understanding and addressing microleakage at specific interfaces, particularly enamel-amalgam, is crucial for clinical success.
  • Further research may optimize this technique to minimize microleakage and enhance restorative outcomes.