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Dentin-smear remains at self-etch adhesive interface.

Atsushi Mine1, Jan De Munck2, Marcio Vivan Cardoso2

  • 1KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven), Leuven, Belgium; Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan.

Dental Materials : Official Publication of the Academy of Dental Materials
|August 17, 2014
PubMed
Summary
This summary is machine-generated.

Mild self-etch adhesives interact with dentin smear layers differently based on surface preparation. The adhesive impregnates, rather than dissolves, the smear layer, forming a resin-smear complex with hydroxyapatite.

Keywords:
AdhesionHybrid layerMild self-etchResin-smear complexSmear layerTEM

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesion Science

Background:

  • Mild self-etch adhesives are susceptible to smear layer interference, potentially compromising bonding.
  • The effectiveness of these adhesives may depend on their ability to penetrate or dissolve the smear layer.

Purpose of the Study:

  • To evaluate the interaction of an ultra-mild self-etch adhesive with human dentin prepared using different surface-treatment methods.
  • To investigate the effect of smear layer thickness and composition on adhesive interaction.

Main Methods:

  • Human dentin surfaces were prepared using a diamond bur (thick smear layer), SiC paper (thin smear layer), or fracturing (smear-free).
  • An ultra-mild self-etch adhesive (Clearfil S3 Bond) was applied to the prepared dentin surfaces.
  • High-resolution transmission electron microscopy (TEM) was used to analyze interfacial cross-sections.

Main Results:

  • The adhesive impregnated the smear layer, forming a resin-smear complex containing hydroxyapatite, rather than dissolving it.
  • On fractured dentin, the resin-smear complex was absent, and adhesive interaction was limited.
  • TEM revealed distinct interfacial ultrastructures based on the surface preparation method, with an electron-dense band indicating chemical interaction.

Conclusions:

  • Dentin surface preparation significantly influences the smear layer's nature and its interaction with ultra-mild self-etch adhesives.
  • The findings highlight the importance of considering surface treatment in optimizing adhesive bonding to dentin.