Evaluation of fracture toughness and mechanical properties of ternary thiol-ene-methacrylate systems as resin matrix for dental restorative composites
Evaluation of fracture toughness and mechanical properties of ternary thiol-ene-methacrylate systems as resin matrix for dental restorative composites
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DOI：
10.1016/j.dental.2013.04.015
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发表时间：
2013-07-01
期刊：
影响因子：
5
通讯作者：
Atai, Mohammad
中科院分区：
文献类型：
--
作者：
Beigi, Saeed;Yeganeh, Hamid;Atai, Mohammad
Objective.研究和评价了硫醇-烯-甲基丙烯酸酯三元体系的断裂韧性、弯曲和动态力学性能以及交联密度，并与相应的常规甲基丙烯酸酯体系进行了比较。合成了烯单体氨基甲酸酯四烯丙基醚单体（UTAE）。基于UTAE、BisGMA/TEGDMA和四硫醇单体（PETMP）的组合制备不同的制剂。以BD/CQ为光引发剂，在可见光下进行光固化反应。通过测量弯曲强度、弯曲模量和断裂韧性来评价机械性能。利用扫描电子显微镜（SEM）研究了断裂试样横截面的形貌。动态力学热分析（DMTA）测定样品的粘弹性。对常规甲基丙烯酸酯体系进行了相同的研究。所得数据采用方差分析和Tukey HSD检验（显著性水平= 0.05）进行统计分析。结果表明，含硫醇-烯结构的试样的断裂韧性得到改善。DMTA揭示了一个较低的玻璃化转变温度和更均匀的结构硫醇烯含有标本相比，仅含有甲基丙烯酸酯单体的系统。具有较高硫醇烯含量的试样的弯曲模量和弯曲强度低于纯甲基丙烯酸酯体系。甲基丙烯酸酯含量较高的试样的断裂表面的SEM显微照片光滑且呈镜面（有光泽），代表脆性断裂。显著性。与甲基丙烯酸酯类似物相比，硫醇-烯-甲基丙烯酸酯体系可用作牙科复合材料的树脂基体，具有增强的断裂韧性。(C)2013年牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objective. Study and evaluation of fracture toughness, flexural and dynamic mechanical properties, and crosslink density of ternary thiol-ene-methacrylate systems and comparison with corresponding conventional methacrylate system were considered in the present study.Methods. Urethane tetra allyl ether monomer (UTAE) was synthesized as ene monomer. Different formulations were prepared based on combination of UTAE, BisGMA/TEGDMA and a tetrathiol monomer (PETMP). The photocuring reaction was conducted under visible light using BD/CQ combination as photoinitiator system. Mechanical properties were evaluated via measuring flexural strength, flexural modulus and fracture toughness. Scanning electron microscopy (SEM) was utilized to study the morphology of the fractured specimen's cross section. Viscoelastic properties of the samples were also determined by dynamic mechanical thermal analysis (DMTA). The same study was performed on a conventional methacrylate system. The data were analyzed and compared by ANOVA and Tukey HSD tests (significance level = 0.05).Results. The results showed improvement in fracture toughness of the specimens containing thiol-ene moieties. DMTA revealed a lower glass transition temperature and more homogenous structure for thiol-ene containing specimens in comparison to the system containing merely methacrylate monomer. The flexural modulus and flexural strength of the specimens with higher thiol-ene content were lower than the neat methacrylate system. The SEM micrographs of the fractured surface of specimens with higher methacrylate content were smooth and mirror-like (shiny) which represent brittle fracture.Significance. The thiol-ene-methacrylate system can be used as resin matrix of dental composites with enhanced fracture toughness in comparison to the methacrylate analogous. (C) 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.