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Related Experiment Videos

Effect of conditioners on dentin permeability using an impedance method.

Nelly Pradelle-Plasse1, François Wenger, Pierre Colon

  • 1Hôtel Dieu, Université Denis Diderot, Service d'Odontologie Garancière, Departement of Restorative Dentistry and Endodontics, Paris, France. nx.pradelle@oreka.com

Journal of Dentistry
|November 27, 2002
PubMed
Summary

Electrochemical impedance spectroscopy effectively quantifies dentin permeability and the impact of acid conditioners. Phosphoric acid and a 10-3 solution significantly improved dentin permeability in this in vitro study.

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Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Electrochemistry

Background:

  • Dentin's permeability is crucial for understanding material interactions and treatment efficacy.
  • Evaluating dentin permeability requires reliable and quantitative methods.
  • Acid conditioners are commonly used in dental procedures to modify dentin surface properties.

Purpose of the Study:

  • To develop and validate a protocol for assessing dentin permeability using electrochemical impedance spectroscopy.
  • To investigate the effects of various acid conditioners on dentin permeability.
  • To establish a quantitative method for evaluating the impact of dental treatments on dentin.

Main Methods:

  • An in vitro setup using dentin disks (1.1mm thick) in a permeation cell with KCl solution.

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  • Electrochemical impedance spectroscopy (EIS) applied via a potentiostat and frequency response analyzer.
  • Measurement of electrical resistance before and after application of different acid conditioners.

    • Main Results:

    • 32% phosphoric acid and a 10-3 solution showed the most significant increase in dentin permeability (9.0% and 6.9%, respectively).
    • An acidic monomer demonstrated intermediate permeability improvement (4.3%).
    • No significant difference was observed between the 10-3 solution and polyacrylic acid (2.8%).

    Conclusions:

    • Electrochemical impedance spectroscopy provides a reliable method to measure ionic conduction and quantify dentin permeability.
    • The impedance method allows for significant evaluation of dentin conditioners' effects on the resistance of the etched zone (REZ).
    • This technique offers a quantitative approach to assess how conditioners alter dentin permeability.