Conversion-dependent shrinkage stress and strain in dental resins and composites
Conversion-dependent shrinkage stress and strain in dental resins and composites
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DOI：
10.1016/j.dental.2004.10.006
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发表时间：
2005-01-01
期刊：
影响因子：
5
通讯作者：
Ge, JH
中科院分区：
文献类型：
--
作者：
Stansbury, JW;Trujillo-Lemon, M;Ge, JH
牙科复合材料的放置因伴随这些材料聚合而产生的收缩而变得复杂。在粘结修复的固化过程中产生的收缩应力可能会在复合材料、牙齿或界面处导致缺陷，从而影响临床性能和/或美观。为了解和尝试控制牙科复合修复体中的收缩应力和应变所做的大量工作，本文对收缩和应力的转换相关发展进行了展望。本文研究了聚合物性能发展与牙科聚合物相关网络结构的物理演变以及光聚合反应过程的相互关联的动力学之间的关系。讨论了一些用于评估牙科树脂和复合材料中转化率的方法。特别是，描述了新引入的技术，这些技术允许通过近红外光谱对转换的实时分析直接耦合到收缩应力或应变的同时动态测量。这些结果与牙科材料文献中的报告以及聚合物科学其他相关领域的补充研究进行了比较。强调了转化率、收缩和应力之间复杂的、非线性的相关性。简要回顾了一些基于材料的方法，旨在最大限度地减少聚合收缩和应力。(C)2004年牙科材料学会。爱思唯尔有限公司出版。保留所有权利。
The placement of dental composites is complicated by the contraction that accompanies polymerization of these materials. The resulting shrinkage stress that develops during cure of a bonded restoration can induce defects within the composite, the tooth or at the interface resulting in compromized clinical performance and/or esthetics. In tight of the substantial efforts devoted to understanding and attempting to control shrinkage stress and strain in dental composite restoratives, this paper offers a perspective on the conversion dependent development of shrinkage and stress. The relationships between polymer property development and the physical evolution of the network structures associated with dental polymers as welt as the interrelated kinetics of the photopolymerization reaction process are examined here. Some of the methods used to assess conversion in dental resins and composites are considered. In particular, newly introduced techniques that allow real time analysis of conversion by near-infrared spectroscopy to be coupled directly to simultaneous dynamic measurements of either shrinkage stress or strain are described. The results are compared with reports from the dental materials literature as well as complementary studies in other related fields of polymer science. The complex, nonlinear correlation between conversion, shrinkage and stress are highlighted. A brief review of some of the materials-based approaches designed to minimize polymerization shrinkage and stress is also provided. (C) 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.