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Related Experiment Videos

Resin adhesion to carious dentin.

Masahiro Yoshiyama1, Franklin R Tay, Yasuhiro Torii

  • 1Department of Operative Dentistry, Okayama University School of Dentistry, Japan.

American Journal of Dentistry
|May 15, 2003
PubMed
Summary

The microtensile bond strength of Clearfil Liner Bond 2V (CV) significantly decreases with dentin caries. Ultrastructural analysis revealed compromised hybrid layer formation and bacterial infiltration in infected dentin, impacting adhesive performance.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Caries Management

Background:

  • Dental caries compromises tooth structure, necessitating effective restorative materials.
  • Understanding adhesive performance on carious dentin is crucial for long-term restorations.

Purpose of the Study:

  • To evaluate the microtensile bond strength (microTBS) of a self-etching priming adhesive system (Clearfil Liner Bond 2V) to normal, caries-affected, and caries-infected dentin.
  • To examine the ultrastructure of the resin-dentin interface using transmission electron microscopy (TEM).

Main Methods:

  • Human molar teeth with deep caries were prepared and categorized into normal, caries-affected, and caries-infected dentin groups.
  • Specimens were bonded with Clearfil Liner Bond 2V, sectioned, and tested for microTBS.

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  • Additional samples underwent TEM for ultrastructural analysis of the hybrid layer.

    • Main Results:

    • MicroTBS to normal dentin was 45 ± 10 MPa, decreasing to 30 ± 10 MPa for caries-affected and 10 ± 5 MPa for caries-infected dentin.
    • TEM revealed thinner hybrid layers (<1 µm) in normal dentin, thicker layers (6-8 µm) in caries-affected dentin, and significantly thicker, disorganized layers (30-60 µm) in caries-infected dentin.
    • Bacterial infiltration was observed in the hybrid layer of caries-infected dentin.

    Conclusions:

    • The self-etching priming adhesive system exhibits reduced bond strength to carious dentin, particularly infected dentin.
    • Compromised hybrid layer formation and bacterial presence in caries-infected dentin significantly impair adhesive bonding.
    • Clinical application of this adhesive system on carious dentin requires careful consideration due to reduced bond durability.