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Adhesion to bovine dentin--surface characterization.

N D Ruse1, D C Smith

  • 1Centre for Biomaterials, Faculty of Dentistry, University of Toronto, Ontario, Canada.

Journal of Dental Research
|June 1, 1991
PubMed
Summary
This summary is machine-generated.

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Acid-etching demineralizes dentin, creating an organic surface ideal for bonding agents that interact with organic components. Bonding agents relying on calcium chelation may fail with acid-etched dentin surfaces.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Surface Chemistry

Background:

  • Dentin surface pre-conditioning significantly impacts dental adhesive performance.
  • Understanding dentin-bonding agent interactions is crucial for successful restorations.

Purpose of the Study:

  • To analyze the elemental composition of dentin surfaces after various pre-conditioning methods.
  • To investigate the interaction between dentin and a specific bonding agent (ScotchBond).
  • To correlate surface morphology with elemental composition.

Main Methods:

  • X-ray photoelectron spectroscopy (XPS) for elemental analysis.
  • Secondary ion mass spectrometry (SIMS) for surface elemental composition.
  • Scanning electron microscopy (SEM) for surface morphology characterization.

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Main Results:

  • Smear layer elemental composition mirrors underlying dentin.
  • Hydrogen peroxide cleaning did not alter dentin's elemental composition.
  • Acid-etching caused demineralization, yielding an organic-rich dentin surface.

Conclusions:

  • Dentin bonding systems utilizing acid-etching require agents that interact with organic dentin components.
  • Calcium chelation-based bonding agents are less likely to succeed with acid-etched dentin.
  • A reaction mechanism for dentin-bonding agent interaction was proposed, indicating potential cohesive failure within the bonding agent.