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Related Experiment Videos

Dentin smear layer: an asset or a liability for bonding?

G J White, D R Beech, M J Tyas

    Dental Materials : Official Publication of the Academy of Dental Materials
    |November 1, 1989
    PubMed
    Summary

    Smear layer removal negatively impacts dentin bonding for most agents, except for Gluma, which requires EDTA. This suggests different bonding mechanisms for dental adhesives.

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    Area of Science:

    • Dental Materials Science
    • Adhesive Dentistry
    • Biomaterials Research

    Background:

    • The smear layer on dentin is a debated factor in dental bonding.
    • Lack of conclusive evidence regarding its impact on bond strength exists.
    • Various agents are proposed for smear layer removal.

    Purpose of the Study:

    • To evaluate the clinical efficacy of smear layer removal agents.
    • To determine the effect of smear layer removal on bond strengths.
    • To compare different dentin bonding agents and glass-ionomer cement.

    Main Methods:

    • Testing bond strengths of a glass-ionomer cement and three dentin bonding agents.
    • Utilizing 17% EDTA for smear layer removal.
    • Examining clinical effects using Scanning Electron Microscopy (SEM) of replicas.

    Main Results:

    • EDTA treatment reduced bond strength for most agents, except Gluma.
    • Gluma showed no significant bond without EDTA treatment.
    • SEM analysis visualized the clinical effects of smear layer removal agents.

    Conclusions:

    • Smear layer removal is detrimental for dentin adhesives relying on calcium interaction.
    • Gluma's bonding mechanism likely involves dentinal collagen, necessitating EDTA.
    • Optimizing dental adhesive protocols requires understanding smear layer's role and material-specific interactions.

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