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Related Experiment Videos

Dentin permeability and eugenol diffusion after full crown preparation.

Jean Camps1, Imad About, Stephanie Gouirand

  • 1Laboratoire IMEB, UFR Odontologie, 13385 Marseille 5, France. jcamps2035@aol.com

American Journal of Dentistry
|June 12, 2003
PubMed
Summary

Teeth prepared for metal-ceramic crowns showed higher dentin permeability than those for metallic crowns. A desensitizing agent equalized permeability, and eugenol diffusion was similar between groups, indicating comparable sealing effectiveness for temporary crowns.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Endodontics

Background:

  • Crown preparations for metallic and metal-ceramic restorations involve different preparation depths and designs.
  • Dentin permeability is a critical factor influencing pulpal responses and the efficacy of sealing agents.
  • Zinc oxide-eugenol cements are commonly used for temporary restorations, with eugenol potentially affecting the pulp.

Purpose of the Study:

  • To compare dentin permeability in teeth prepared for metallic versus metal-ceramic crowns.
  • To evaluate the effectiveness of a desensitizing agent on dentin permeability in both preparation types.
  • To assess pulpal eugenol concentration after temporary cementation with zinc oxide-eugenol based cement.

Main Methods:

  • Human mandibular molars were prepared for metallic crowns, and hydraulic conductance was measured before and after desensitizer application.

Related Experiment Videos

  • Preparations were further reduced for metal-ceramic crowns, and hydraulic conductance was re-evaluated.
  • Eugenol diffusion into phosphate-buffered saline (PBS) through dentin was measured after temporary cementation with zinc oxide-eugenol cement.

    • Main Results:

    • Metal-ceramic preparations exhibited twice the hydraulic conductance of metallic preparations (P < 0.001).
    • The desensitizing agent significantly reduced hydraulic conductance in both groups, leading to similar permeability post-treatment.
    • No significant difference in eugenol diffusion was observed between the groups, though diffusion decreased over time.

    Conclusions:

    • Metal-ceramic preparations result in increased dentin permeability compared to metallic preparations.
    • Desensitizing agents effectively reduce dentin permeability regardless of crown preparation type.
    • Zinc oxide-eugenol cements provide comparable sealing against eugenol diffusion for both metallic and metal-ceramic preparations.