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Related Experiment Videos

Increment technique for extended Class V restorations: an experimental study.

Rolf Müllejans1, H Lang, N Schüler

  • 1Department of Restorative and Preventive Dentistry, Heinrich-Heine-University, Duesseldorf, Germany. muellejr@uni-duesseldorf.de

Operative Dentistry
|July 25, 2003
PubMed
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Using a thin layer technique for polyacid-modified composite restorations significantly minimizes gaps at the dentin margin compared to the bulk technique. This increment approach improves marginal integrity in Class V cavities.

Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials

Background:

  • Polymerization shrinkage in dental composites causes stress, potentially leading to marginal gaps.
  • The increment technique, applying materials in thin layers, may mitigate shrinkage-related stress.
  • Polyacid-modified composite resins offer unique properties but require careful application.

Purpose of the Study:

  • To evaluate the impact of the increment technique on the marginal integrity of Class V polyacid-modified composite restorations.
  • To compare gap formation at enamel and dentin margins using different application techniques.

Main Methods:

  • Thirty extracted premolars with extended Class V cavities (enamel-dentin margins) were restored.
  • Three groups were tested: thin coronal increment, thin apical increment, and bulk placement.

Related Experiment Videos

  • Restorations underwent cyclic thermal loading, and marginal integrity was assessed via SEM before and after.

    • Main Results:

    • No significant differences in marginal integrity were observed at the enamel-restoration interface across groups.
    • Fewer marginal gaps were found at the dentin-restoration interface in both increment groups compared to the bulk group.
    • The coronal increment technique showed a significantly higher percentage of intact dentin margins than the bulk technique.

    Conclusions:

    • The increment technique effectively minimizes gap formation at the dentin margin for Class V polyacid-modified composite restorations.
    • Applying thin layers, particularly in the coronal portion, enhances marginal integrity in dentin-bound cavities.
    • This technique offers a viable strategy to improve the longevity of composite restorations in challenging cavity preparations.