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Multiple Adhesive Layering Influence on Dentin Bonding and Permeability.

Edilausson Moreno Carvalho1, Rodrigo Stanislawczuk2, Thays Costa3

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The European Journal of Prosthodontics and Restorative Dentistry
|June 2, 2017
PubMed
Summary
This summary is machine-generated.

Applying multiple layers of Adper Single Bond 2 adhesive to dentin significantly enhances microtensile bond strength (μTBS) and reduces permeability compared to a single layer. More than one layer is recommended for optimal dental bonding.

Keywords:
AdhesiveDentinMicrotensile Bond StrengthNanoleakagePermeabilityScanning Electron Microscope

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials Engineering

Background:

  • Dental adhesives are crucial for restoring tooth structure.
  • Etch-and-rinse adhesives require careful application technique.
  • Understanding layer number effects is vital for clinical success.

Purpose of the Study:

  • To investigate how the number of Adper Single Bond 2 layers affects dentin microtensile bond strength (μTBS).
  • To assess the impact of adhesive layer number on permeability and nanoleakage.
  • To determine optimal application protocols for this etch-and-rinse adhesive.

Main Methods:

  • Applied 1, 2, or 4 layers of Adper Single Bond 2 to dentin.
  • Tested microtensile bond strength (μTBS) of bonded specimens.
  • Analyzed silver nitrate penetration using SEM to evaluate permeability and nanoleakage.
  • Evaluated fracture modes using stereomicroscopy and SEM.

Main Results:

  • Two and four layers of adhesive showed significantly higher μTBS than a single layer.
  • Increased adhesive layers correlated with decreased adhesive permeability.
  • Silver nitrate uptake was observed in the hybrid layer across most groups.
  • Fractures predominantly occurred at the mixed adhesive-dentin interface.

Conclusions:

  • Applying multiple layers (2 or 4) of Adper Single Bond 2 improves dentin bond strength and reduces permeability.
  • A single layer application results in inferior bond strength and higher permeability.
  • Clinical recommendations should favor multi-layer application for enhanced adhesive performance.