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Related Experiment Videos

Adhesion of a total-etch phosphate ester bonding agent

J Perdigao1, E J Swift

  • 1Coimbra Medical and Dental School, Portugal.

American Journal of Dentistry
|June 1, 1994
PubMed
Summary

This study compared dentin etching methods for dental bonding agents. Phosphoric acid gels showed moderate shear bond strengths, unaffected by concentration or thickener type, while a citric acid gel was less effective.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials

Background:

  • Optimizing dentin bonding is crucial for the longevity of dental restorations.
  • Phosphate ester bonding agents offer potential for enhanced adhesion.
  • Various dentin etching protocols exist, influencing bond strength.

Purpose of the Study:

  • To evaluate the shear bond strength of Clearfil Photo Bond using different phosphoric acid etching gels.
  • To compare these results with the Clearfil Liner Bond system.
  • To assess the effect of etching agent composition on dentin demineralization.

Main Methods:

  • Sixty human molars were prepared to expose dentin.
  • Dentin was etched with various phosphoric acid gels (K-etchant, Uni-Etch, All-Etch, Ultra-Etch) or a citric acid/calcium chloride gel (10/20 Ca).
  • Specimens were bonded with Clearfil Photo Bond or Clearfil Liner Bond, thermocycled, and tested for shear bond strength using an Instron universal testing machine. Scanning Electron Microscopy (SEM) was used for demineralization depth analysis.

Main Results:

  • Mean shear bond strengths varied from 1.3 MPa (control) to 15.9 MPa (Clearfil Liner Bond).
  • Phosphoric acid-etched groups exhibited shear bond strengths between 5-8 MPa, with no significant difference based on acid concentration or thickener type.
  • SEM revealed phosphoric acid demineralized dentin to 5 microns, while 10/20 Ca demineralized to 1-1.5 microns.

Conclusions:

  • Phosphoric acid etching provides moderate and consistent shear bond strengths for Clearfil Photo Bond, irrespective of gel formulation.
  • The Clearfil Liner Bond system achieved significantly higher bond strengths.
  • Dentin etching depth varies significantly between phosphoric acid and citric acid-based agents.

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