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Related Experiment Videos

Microleakage and the class V composite cavosurface

G A Crim, S L Mattingly

    ASDC Journal of Dentistry for Children
    |September 1, 1980
    PubMed
    Summary
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    Composite restorations show significant leakage, with no single method eliminating it entirely. Acid etching enamel and beveling margins reduced dye penetration, improving sealant effectiveness.

    Area of Science:

    • Restorative Dentistry
    • Dental Materials

    Background:

    • Microleakage around dental restorations is a persistent clinical challenge.
    • Understanding factors influencing marginal seal is crucial for restoration longevity.

    Purpose of the Study:

    • To evaluate the effectiveness of different surface treatments on reducing microleakage in composite restorations.
    • To compare the sealing capabilities of various techniques at different margins (gingival vs. occlusal).

    Main Methods:

    • Composite restorations were placed using various protocols, including acid etching and beveling.
    • Dye penetration was used to assess the extent of marginal leakage.
    • Leakage was quantified at both gingival and occlusal margins.

    Main Results:

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    • Substantial leakage was observed around unetched composite restorations.
    • Etching peripheral enamel significantly decreased dye penetration.
    • Beveling the cavosurface margin, combined with acid etching, significantly reduced leakage.
    • The gingival margin exhibited greater leakage than the occlusal margin.
    • Intermediary bonding resin did not improve marginal sealing compared to etchant alone.

    Conclusions:

    • No single tested procedure completely eliminated microleakage.
    • Acid etching and beveling cavosurface margins are effective in reducing composite restoration leakage.
    • Gingival margins are more susceptible to leakage than occlusal margins.