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Bond strength testing--what does it mean?

G Oilo1

  • 1Scandinavian Institute of Dental Materials, Haslum, Norway.

International Dental Journal
|October 1, 1993
PubMed
Summary

Standardizing dental bond strength testing is crucial for accurate clinical relevance. New ISO guidelines and factors like dentine variation and storage conditions are discussed.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesion Science

Background:

  • Accurate assessment of dental adhesive bond strength is critical for clinical success.
  • Current bond strength testing methods have limitations in interpretation and clinical relevance.
  • Standardization of testing protocols is needed to ensure reliable and comparable results.

Purpose of the Study:

  • To discuss factors influencing bond strength testing in dentistry.
  • To evaluate the clinical relevance of various bond strength testing methods.
  • To refer to the new ISO document (ISO CD TR 11405) for guidance on adhesion testing.

Main Methods:

  • Comparison of tensile and shear test methods for bond strength evaluation.
  • Discussion of dentine substrate variations (remaining dentine thickness, smear layer).
  • Analysis of in vitro test storage conditions (short-term, long-term, thermocycling).

Main Results:

  • Microscopical studies indicate some adhesives can achieve dentine-fracturing bond strength under optimal conditions.
  • Variations in dentine substrate and storage conditions significantly influence bond strength values.
  • Tensile and shear test methods yield comparable bond strength values when standardized.

Conclusions:

  • Standardization of dental bond strength testing is essential for reliable clinical interpretation.
  • Understanding factors like substrate variability and aging is key to predicting clinical performance.
  • Adhesive bond strengths sufficient to fracture dentine are achievable, highlighting the importance of standardized testing.

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