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Related Experiment Videos

Solvent-induced dimensional changes in EDTA-demineralized dentin matrix.

D H Pashley1, K A Agee, M Nakajima

  • 1Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912, USA. dpashley@mail.mcg.edu

Journal of Biomedical Materials Research
|May 8, 2001
PubMed
Summary

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Polar solvents significantly influence dentin matrix re-expansion and shrinkage. The study found that hydrogen bonding capacity and water concentration in solvents like hydroxyethyl methacrylate (HEMA) are key factors affecting dentin matrix behavior.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Polymer Chemistry

Background:

  • Dentin matrix properties are crucial for dental restorations.
  • Understanding solvent interactions with demineralized dentin is essential for developing effective primers and bonding agents.
  • Previous research has not fully elucidated the role of polar solvent properties on dentin matrix dimensional changes.

Purpose of the Study:

  • To investigate the influence of polar solvents on the re-expansion of dried demineralized dentin matrix.
  • To assess the effect of polar solvents on the shrinkage of moist demineralized dentin.
  • To test the hypothesis that polar solvents do not influence these dimensional changes.

Main Methods:

  • Dentin disks were demineralized using EDTA.

Related Experiment Videos

  • Matrix height changes were measured in real-time using a specialized device.
  • Dried and moist dentin specimens were exposed to various polar solvents (including water, alcohols, and hydroxyethyl methacrylate (HEMA)) and mixtures.
  • Regression analysis correlated matrix height changes with Hansen's solubility parameters (delta(d), delta(p), delta(h), delta(t)).

    • Main Results:

    • Water-free polar solvents with low hydrogen bonding (H-bond) ability, like neat HEMA, did not re-expand dried dentin and caused shrinkage in moist dentin.
    • Increasing water concentration in HEMA-water mixtures enhanced dried matrix re-expansion and reduced moist matrix shrinkage.
    • Solvents with higher H-bonding capacities (e.g., methanol, ethanol, water) re-expanded dried dentin proportionally to their H-bonding solubility parameter (delta(h)) and caused transient shrinkage followed by slow re-expansion in moist dentin.

    Conclusions:

    • The null hypothesis is rejected; polar solvents significantly influence demineralized dentin matrix dimensional changes.
    • Hydrogen bonding capacity and water content of polar solvents are critical determinants of dentin matrix re-expansion and shrinkage.
    • These findings have implications for optimizing dental primer formulations to improve adhesion and minimize gap formation.