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Related Experiment Videos

Dentin-predentin complex and its permeability: physiologic overview.

D H Pashley

    Journal of Dental Research
    |April 1, 1985
    PubMed
    Summary
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    Dentin permeability, crucial for solute diffusion, rapidly decreases after cavity preparation due to plasma protein leakage into dentinal tubules. This rapid reduction occurs before detectable histologic changes, highlighting a novel mechanism impacting dentin barrier function.

    Area of Science:

    • Biomaterials Science
    • Dental Research
    • Physiology

    Background:

    • Dentinal tubules are the primary pathways for solute diffusion across dentin.
    • Dentin permeability is influenced by tubule characteristics and intratubular materials.
    • Previous understanding suggested irritation dentin significantly reduces permeability.

    Purpose of the Study:

    • To investigate the rapid changes in dentin permeability following cavity preparation.
    • To elucidate the underlying mechanisms responsible for the observed decrease in dentin permeability.
    • To determine the role of plasma proteins in post-operative dentin barrier function.

    Main Methods:

    • In vivo experiments using dogs with freshly cut cavities in sound dentin.
    • Measurement of dentin permeability over time post-cavity preparation.

    Related Experiment Videos

  • Comparison of permeability changes in normal dogs versus dogs depleted of plasma fibrinogen.

    • Main Results:

    • Dentin permeability of freshly cut cavities decreased rapidly (50-60% within 6 hours) before histologic changes.
    • This rapid decline in permeability did not occur in dogs depleted of plasma fibrinogen.
    • The findings implicate leakage of plasma proteins from pulpal vessels into dentinal tubules.

    Conclusions:

    • Plasma protein leakage into dentinal tubules is a primary cause of rapid permeability reduction post-cavity preparation.
    • These proteins are adsorbed or trapped within tubules, effectively reducing dentin permeability.
    • This mechanism impacts the immediate barrier function of dentin following dental procedures.