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Related Experiment Videos

Dentin: a dynamic substrate--a review.

D H Pashley1

  • 1School of Dentistry, Medical College of Georgia, Augusta 30912-1129.

Scanning Microscopy
|March 1, 1989
PubMed
Summary
This summary is machine-generated.

The smear layer on cut dentin protects but hinders dental material bonding. Research explores alternatives to improve adhesion while managing dentin

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Area of Science:

  • Dental Biomaterials
  • Dentin Structure and Physiology

Background:

  • Dentin exhibits variable tubule density and water content, increasing towards the pulp.
  • Cutting dentin or enamel creates a smear layer, a 1-micron thick debris layer.
  • The smear layer reduces dentin permeability but impedes dental material bonding.

Purpose of the Study:

  • To investigate the properties and implications of the dentin smear layer.
  • To explore methods for overcoming smear layer interference in dental bonding.
  • To understand the impact of smear layer removal on dentin permeability and material adhesion.

Main Methods:

  • Scanning electron microscopy (SEM) for visualizing smear layer structure.
  • Electronic particle sizing equipment for analyzing smear layer components.

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  • In vivo and in vitro assessments of dentin permeability and material bonding.

    • Main Results:

    • Smear layer significantly lowers dentin permeability, offering protection.
    • Smear layer removal enhances adaptation and bonding strength of dental materials.
    • Acid-labile nature of smear layers leads to dissolution in oral fluids.
    • Removal of smear layers can increase dentin permeability and potential for sensitivity.

    Conclusions:

    • The smear layer presents a dual role: protective barrier and bonding impediment.
    • Research focuses on acid-resistant alternatives to the smear layer for improved dental material adhesion.
    • Balancing smear layer management is crucial for effective and durable dental restorations, avoiding pulpal inflammation.