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Related Experiment Videos

Bond failure at dentin-composite interfaces with 'single-bottle' adhesives.

P R Walshaw1, L E Tam, D McComb

  • 1Restorative Dentistry, Faculty of Dentistry, University of Toronto, 124 Edward Street, Toronto, Ontario, Canada. paula.walshaw@utoronto.ca

Journal of Dentistry
|March 26, 2003
PubMed
Summary

Investigating dental adhesive performance, this study found that optimal interfacial fracture toughness (intK(1c)) depends on good resin infiltration and adequate adhesive layer thickness. Failures often occurred at the adhesive-hybrid layer interface.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesion Science

Background:

  • Significant variations in interfacial fracture toughness (intK(1c)) exist among dental adhesives.
  • Understanding micromorphological differences is crucial for explaining these intK(1c) variations.

Purpose of the Study:

  • To examine the micromorphology of fractured dental adhesive interfaces using SEM.
  • To correlate SEM findings with interfacial fracture toughness results for six different dentinal adhesives.

Main Methods:

  • Interfacial fracture toughness specimens were created using bovine dentin and resin composite with five single-bottle adhesives and one resin-modified glass ionomer.
  • Fractured specimens were sectioned, critical-point dried, and analyzed via scanning electron microscopy (SEM).

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Main Results:

  • Most failures occurred at the adhesive-hybrid layer interface.
  • Adhesives with good resin infiltration and adequate intermediate layer thickness (e.g., Single Bond, One Step) exhibited higher intK(1c).
  • Thicker films from filled adhesives (e.g., Optibond Solo, Fuji Bond LC) provided a good dentin seal despite cohesive failures.

Conclusions:

  • The interface between the adhesive and hybrid layers is a common failure site.
  • A fracture-resistant interface requires good resin infiltration and an adequately thick intermediate adhesive layer.
  • Filled adhesives can offer a reliable dentin seal through cohesive failure.