Evaluation of the effect of water-uptake on the impedance of dental resins
Evaluation of the effect of water-uptake on the impedance of dental resins
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DOI：
10.1016/j.biomaterials.2006.01.045
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发表时间：
2006-06-01
期刊：
影响因子：
14
通讯作者：
Pashley, D
中科院分区：
文献类型：
--
作者：
Wadgaonkar, B;Ito, S;Pashley, D
电阻抗谱（EIS）提供了一种定量的方法来测量树脂膜在水溶液中的稳定性随时间的推移。目的：本研究的目的是测量五个实验牙科粘合剂膜（ca. 17 μ m厚）的增加的亲水性（根据其Hoy溶解度参数排名），以及这些值在水性缓冲液中3周内变化多少。结果：树脂1-4膜的电阻（R-r）在第一天增加最多，并且在第1天从树脂1的1 × 10（11）欧姆变化到树脂5的40 Ω。树脂1-4的第1天R-r值与它们的氢键力的Hoy溶解度参数成反比。树脂1-3和5的电阻抗值变化很大，但随着时间的推移相对恒定，而树脂4的电阻抗值从第1天到第21天下降超过99%（p < 0.05）。树脂1-4的膜的电容（C-r）在第一天都增加，然后在20天内相对不变（除了树脂4继续增加），并且在0.01和1 nF之间。通过TEM的银吸收揭示了随时间在树脂4和5中形成的水填充的支化结构的发展。(c)2006爱思唯尔有限公司版权所有。
Electrical impedance spectroscopy (EIS) offers a quantitative method of measuring the stability of resin films in aqueous solution over time.Purpose: The purpose of this study was to measure the EIS of five experimental dental adhesive films (ca. 17 pm thick) of increasing hydrophilicity (ranked by their Hoy's solubility parameters), and how much these values change over 3 weeks in aqueous buffer.Methods: The 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.Results: The resistance (R-r) of the resins 1-4 films increased most during the first day, and varied from 1 x 10(11) ohm for resin 1, to 40 Omega for resin 5 at day 1. The day 1 R-r 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 < 0.05). Capacitance (C-r) 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. (c) 2006 Elsevier Ltd. All rights reserved.