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Related Experiment Videos

Microleakage through dentin after crown cementation

S N White1, R Furuichi, S M Kyomen

  • 1Department of Restorative Dentistry, University of Southern California School of Dentistry, Los Angeles 90089-0641, USA.

Journal of Endodontics
|January 1, 1995
PubMed
Summary
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A new composite resin bonding agent (GMA/NPG) significantly reduced microleakage in artificial crowns compared to traditional cements. This dental material shows promise for preventing pulpal sensitivity and disease.

Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials

Background:

  • Microleakage around dental restorations can lead to secondary caries and pulpal inflammation.
  • The choice of luting cement significantly influences the marginal seal of indirect restorations.

Purpose of the Study:

  • To evaluate and compare the microleakage potential of various luting agents used for base metal alloy crowns.
  • To determine the efficacy of a novel composite resin bonding agent in preventing microleakage through dentinal tubules.

Main Methods:

  • Standardized preparations on human premolars were restored with base metal crowns.
  • Crowns were luted using zinc phosphate, polycarboxylate, glass ionomer, phosphate ester composite resin, or a composite resin with NPG-GMA bonding agent.

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  • Artificial aging, staining, and sectioning were employed to quantify microleakage along dentinal tubules.

    • Main Results:

    • The composite resin with NPG-GMA bonding agent (GMA/NPG) exhibited the least microleakage.
    • Microleakage increased in the order: GMA/NPG < Glass Ionomer < GMA/PE < Polycarboxylate < Zinc Phosphate.
    • GMA/NPG demonstrated significantly lower leakage compared to all other tested luting materials.

    Conclusions:

    • The NPG-GMA bonding agent offers superior sealing properties for indirect restorations.
    • This material may be effective in reducing post-operative pulpal sensitivity and preventing pulpal pathosis.