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Evaluation of the effect of water-uptake on the impedance of dental resins

Paper ID Volume ID Publish Year Pages File Format Full-Text
10716 699 2006 8 PDF Available
Title
Evaluation of the effect of water-uptake on the impedance of dental resins
Abstract

Electrical impedance spectroscopy (EIS) offers a quantitative method of measuring the stability of resin films in aqueous solution over time.PurposeThe purpose of this study was to measure the EIS of five experimental dental adhesive films (ca. 17 μm thick) of increasing hydrophilicity (ranked by their Hoy's solubility parameters), and how much these values change over 3 weeks in aqueous buffer.MethodsThe resin films were placed in a U-shaped chamber and a pair of Ag–AgCl electrodes was used for EIS. The EIS results were confirmed by immersing the films in 50% AgNO3 for 24 h to trace the distribution of any water absorption into the resins by TEM observations.ResultsThe resistance (Rr) of the resins 1–4 films increased most during the first day, and varied from 1×1011 ohm for resin 1, to 40 Ω for resin 5 at day 1. The day 1 Rr values of resins 1–4 were inversely proportional to their Hoy's solubility parameter for hydrogen bonding forces. Electrical impedance values of resins 1–3 and 5 varied widely but were relatively constant over time, while those of resin 4 decreased more than 99% from day 1 to 21 (p<0.05p<0.05). Capacitance (Cr) of films of resins 1–4 all increased over the first day and then were relatively unchanged over the 20 days (except for resin 4 that continued to increase) and were between 0.01 and 1 nF. Silver uptake by TEM revealed the development of water-filled branching structures that formed in resins 4 and 5 over time.

Keywords
Dental adhesives; Dielectric constant; Electrochemistry; Hydrophilicity; Photopolymerisation
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Evaluation of the effect of water-uptake on the impedance of dental resins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 27, Issue 17, June 2006, Pages 3287–3294
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us