Dynamic thermomechanical properties and sorption characteristics of two commercial light cured dental resin composites
Dynamic thermomechanical properties and sorption characteristics of two commercial light cured dental resin composites
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DOI：
10.1016/j.dental.2007.08.004
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发表时间：
2008-06-01
期刊：
影响因子：
5
通讯作者：
Vouvoudi, Evagelia Ch.
中科院分区：
文献类型：
--
作者：
Sideridou, Irini D.;Karabela, Maria M.;Vouvoudi, Evagelia Ch.
目标.这项工作的第一个目标是通过DMTA研究两种当前牙科树脂复合材料Tetric EvoCeram（纳米杂化）和Heliomolar（微填充）在干燥条件下和水中长达30天的粘弹性（E '，E“”，tan δ，T-g）。第二个目的是确定这些复合材料在水和乙醇/水溶液75体积%的吸附特性。方法.对于DMTA，将条形试样分为五组，每组三个样品。第一组由固化后1小时测量的干燥样品组成。第二组和第三组由在80 +/- 1摄氏度的空气中加热1天或在80 +/- 1摄氏度的蒸馏水中储存1天的样品组成。第四组和第五组由分别在37 +/-1 ℃的蒸馏水中储存1天和7天的样品组成。此外，将样品盘（直径15 mm，厚度1 mm）浸入水或75体积%的水溶液中。乙醇/水溶液，37 +/- 1 ℃。以固定的时间间隔将其取出，吸干以除去过量的液体，称重并放回液体中。这个过程持续了30天。记录并比较了两种复合材料在不同条件下处理后的粘弹性能（E ′、E ″、tan δ、T-g）。还研究了复合材料在水和75体积%乙醇/水溶液中浸渍的质量吸收、扩散系数、溶解度和体积变化在37 +/- 1 ℃下测定。Tetric EvoCeram是一种纳米杂化复合材料，与Heliomolar具有相似的树脂基体，Heliomolar是一种微填充材料，具有更好的动态热机械性能和吸附特性。(C)2007年，牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives. The first objective of this work is the study by DMTA of viscoelastic properties (E', E '', tan delta, T-g) of two current dental resin composites Tetric EvoCeram (nanohybrid) and Heliomolar (microfilled) in dry condition and in water for up to 30 days. The second objective is to determine the sorption characteristics of these composites in water and ethanol/water solution 75 vol.%.Methods. For DMTA the bar-shaped specimens divided into five groups of three samples each. The first group consisted of dry samples measured 1 h after curing. The second and third group consisted of samples, which had been heated in air at 80 +/- 1 degrees C for 1 day or had been stored in distilled water at 80 +/- 1 degrees C for 1 day. The fourth and fifth group consisted of samples, which had been stored in distilled water at 37 +/- 1 degrees C for periods 1 and 7 days correspondingly. Also specimen discs (15 mm in diameter and 1 mm in thickness) were immersed in water or a 75 vol.% ethanol/water solution at 37 +/- 1 degrees C. At fixed time intervals they were removed, blotted dry to remove excess liquid, weighted and returned to the liquid. This process continued for 30 days.Results. The viscoelastic properties (E', E '', tan delta, T-g) of the two composites treated under different conditions were recorded and compared. Also the mass uptake, diffusion coefficient, solubility and volumetric changes for immersion of composites in water and ethanol/water solution 75 vol.% at 37 +/- 1 degrees C were determined.Significance. Tetric EvoCeram a nanohybrid composite with similar about resin matrix with Heliomolar which is a microfilled showed better dynamic thermomechanical properties and sorption characteristics than Heliomolar. (C) 2007 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.