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Related Experiment Videos

Acid-etching and hydration influence on dentin roughness and wettability.

J I Rosales1, G W Marshall, S J Marshall

  • 1Dental Materials Department, Granada University, Spain.

Journal of Dental Research
|October 8, 1999
PubMed
Summary

Dentin surface changes after etching and dehydration significantly impact material adhesion. Dehydration exposes hydrophobic components, potentially hindering bonding with hydrophilic dental primers.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Surface Chemistry

Background:

  • Effective adhesion of dental restorative materials to dentin is crucial for successful operative and preventive dentistry.
  • Dentin surface properties, specifically wettability and roughness, are critical factors influencing bond strength.

Purpose of the Study:

  • To investigate variations in water contact angle and roughness on superficial and deep dentin surfaces.
  • To evaluate the effects of polishing, etching, dehydration, and rehydration on dentin substrate properties.

Main Methods:

  • Utilized Atomic Force Microscopy (AFM) for roughness quantification and Axisymmetric Drop Shape Analysis (ADSA) for contact angle measurements.
  • Tested dentin samples from third molars under hydrated, polished, etched (10% H3PO4), dehydrated, and rehydrated conditions.

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  • Statistical analysis included two-way Repeated Measures ANOVA with Tukey's HSD post-hoc tests at p < 0.05.

    • Main Results:

    • Etching increased both wettability and roughness. Desiccation led to a significant decrease in wettability while roughness continued to increase.
    • Rehydration restored water contact angles to levels similar to the etched state.
    • Intertubular roughness was not significantly affected by dentin depth, but deep dentin exhibited lower water contact angles.

    Conclusions:

    • Dentin depth and dehydration significantly alter surface properties, exposing hydrophobic moieties.
    • These alterations can negatively impact the bonding of hydrophilic dental primer systems to dentin.
    • Understanding these surface changes is vital for optimizing dental adhesive protocols.