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Influence of selected variables on adhesion testing.

C S Fowler1, M L Swartz, B K Moore

  • 1Department of Dental Materials, Indiana University School of Dentistry, Indianapolis.

Dental Materials : Official Publication of the Academy of Dental Materials
|July 1, 1992
PubMed
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Shear and tensile adhesion tests showed comparable bond strengths, but shear tests yielded more accurate adhesive failures. Tensile apparatus design impacted results, while human and bovine enamel showed similar bond strengths, unlike dentin.

Area of Science:

  • Dental materials science
  • Biomaterials engineering
  • Adhesion science

Background:

  • Adhesion testing is crucial for evaluating dental restorative materials.
  • Standardized methods are needed to ensure reliable bond strength data.
  • Variability in testing parameters can influence outcomes.

Purpose of the Study:

  • To compare the effects of test mode (shear vs. tension) on bond strength.
  • To investigate the influence of tensile apparatus design on bond strength.
  • To evaluate the comparability of human and bovine tooth substrates in adhesion testing.

Main Methods:

  • Adhesion testing was performed using both shear and tensile modes.
  • Two distinct tensile apparatus designs were employed.

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  • Human and bovine enamel and dentin were used as substrates.

    • Main Results:

    • No significant difference in bond strength was found between shear and tensile tests.
    • Shear testing resulted in a higher incidence of true adhesive failures.
    • Tensile bond strengths varied significantly between different apparatus designs.
    • Human and bovine enamel exhibited comparable bond strength values.
    • Dentin substrates showed variability, with a trend towards higher bond strength in bovine dentin.

    Conclusions:

    • Shear testing may be preferable for adhesion testing due to its higher rate of adhesive failures.
    • The design of the tensile apparatus is a critical factor influencing bond strength measurements.
    • Bovine enamel is a suitable substitute for human enamel in adhesion testing.
    • Further investigation is needed for dentin substrate variability.