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Related Experiment Videos

Interaction between the dentinal smear layer and composite bond strength.

S Ishioka1, A A Caputo

  • 1University of California, School of Dentistry, Los Angeles.

The Journal of Prosthetic Dentistry
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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Maintaining the dentinal smear layer during dental procedures resulted in the highest shear bond strengths for composite resins. Agents that removed the smear layer, like ferric oxalate, diminished bond strength.

Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials

Background:

  • The dentinal smear layer, a layer of debris on dentin surfaces after preparation, can influence the bond strength of dental adhesives.
  • Understanding its interaction with various removal agents and adhesive systems is crucial for predictable clinical outcomes.

Purpose of the Study:

  • To investigate the effect of different dentinal smear layer removal agents on the shear bond strength of a composite resin to dentin.
  • To evaluate the performance of a specific dentinal adhesive (Scotchbond) and composite resin (P-30) system in relation to smear layer integrity.

Main Methods:

  • Human molars were used, and the dentinal smear layer was either kept intact or removed using agents like ferric oxalate and 17% EDTA.
  • Shear bond strength tests were conducted using Scotchbond dentinal adhesive and P-30 composite resin on prepared dentin surfaces.

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Main Results:

  • The highest shear bond strengths were achieved when the dentinal smear layer remained intact, particularly with the Scotchbond adhesive and P-30 composite.
  • Removing the smear layer resulted in bond strengths comparable to those with an intact smear layer.
  • Application of ferric oxalate and 17% EDTA led to significantly reduced bond strengths.

Conclusions:

  • Optimal shear bond strengths for the tested adhesive-composite resin systems may be achieved with an intact dentinal smear layer.
  • Aggressive smear layer removal agents can negatively impact bond strength.
  • The findings suggest a reconsideration of routine smear layer removal in certain adhesive protocols.