The effect of cure rate on the mechanical properties of dental resins
The effect of cure rate on the mechanical properties of dental resins
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DOI：
10.1016/s0109-5641(01)00010-0
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发表时间：
2001-11-01
期刊：
影响因子：
5
通讯作者：
Bowman, CN
中科院分区：
文献类型：
--
作者：
Lovell, LG;Lu, H;Bowman, CN
目的：本研究探讨了固化速率对一种常见的二甲基丙烯酸酯牙科树脂配方（75/25重量% bis-GMA/TEGDMA）的力学性能的影响。方法：聚合速率和最终转化率的精确标本随后用于力学测试监测近红外（近红外）光谱。通过动态力学分析（DMA）确定玻璃化转变温度（T（g））和模量作为温度的函数。使用Bisferter引发系统来产生不包含任何捕获的自由基的部分固化的网络。通过消除被困的自由基从系统中，所形成的网络，其特征在于作为一个函数的温度和双键的转换，而不诱导额外的热固化在testing.Results：共聚物试样固化与紫外线和可见光引发系统，紫外光强度的变化超过四个数量级，固化温度相差60 degreesC。即使这些树脂的聚合速率有很大的不同，类似的T（g）和模量进行测量的标本固化到相同的最终双键conversion.Significance：这项研究表明，高度交联的二甲基丙烯酸酯系统，如双-GMA/TEGDMA，表现出类似的网络结构和性能作为双键转化率的函数，无论方法或固化速率。(C)2001年牙科材料学院。由Elsevier Science Ltd.出版，版权所有。
Objective: This study investigates the effect of cure rate on the mechanical properties of a common dimethacrylate dental resin formulation (75/25 wt% bis-GMA/TEGDMA).Methods: The polymerization rate and final conversion of the exact specimens subsequently used for mechanical testing were monitored by near-infrared (near-IR) spectroscopy. The glass transition temperature (T(g)) and modulus, as a function of temperature, were determined by dynamic mechanical analysis (DMA). Iniferter initiating systems were used to create partially cured networks that did not contain any trapped radicals. By the elimination of trapped radicals from the system, the formed networks can be characterized as a function of both temperature and double bond conversion without inducing additional thermal cure during testing.Results: Copolymer specimens were cured with UV and visible light initiating systems, UV light intensities that varied by over four orders of magnitude, and cure temperatures that differed by 60 degreesC. Even though the polymerization rates for these resins were vastly different, similar T(g) and modulus were measured for specimens cured to the same final double bond conversion.Significance: This study shows that highly cross-linked dimethacrylate systems, such as bis-GMA/TEGDMA, exhibit similar network structure and properties as a function of double bond conversion, regardless of the method or rate of cure. (C) 2001 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.