Control of polymerization shrinkage and stress in nanogel-modified monomer and composite materials.
Control of polymerization shrinkage and stress in nanogel-modified monomer and composite materials.
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DOI：
10.1016/j.dental.2011.01.006
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发表时间：
2011-06
期刊：
影响因子：
5
通讯作者：
Stansbury, Jeffrey W.
中科院分区：
文献类型：
--
作者：
Moraes, Rafael R.;Garcia, Jeffrey W.;Barros, Matthew D.;Lewis, Steven H.;Pfeifer, Carmem S.;Liu, JianCheng;Stansbury, Jeffrey W.
本研究证明了纳米级预聚物颗粒作为添加剂对模拟牙科单体和复合材料配方的影响。离散的纳米凝胶颗粒制备的甲基丙烯酸异冰片酯和氨基甲酸酯二甲基丙烯酸酯在链转移剂的存在下，这也提供了一种手段，将反应性基团的预聚物的溶液光聚合。将纳米凝胶以5至40重量%的增量加入到三甘醇二甲基丙烯酸酯（TEGDMA）中，并对树脂粘度、反应动力学、收缩率、机械性能、应力和光学性能进行评价。钡玻璃填料的最大加载量被确定为纳米凝胶含量的函数，并且在一致性、转化率、收缩率和机械性能方面比较具有不同纳米凝胶含量但均匀填料加载的复合材料。高转化率，高分子量的内部交联和环化的纳米凝胶预聚物，有效地制备和再分散到TEGDMA的粘度伴随纳米凝胶含量的指数上升。只要使用反应性纳米凝胶，任何水平的纳米凝胶添加对反应动力学、转化率或机械性能都不会产生有害影响。聚合收缩和应力的降低与纳米凝胶含量成比例。即使在高纳米凝胶浓度下，玻璃填料的最大负载量相对于对照仅略微降低，并且获得具有低收缩率的高强度复合材料。反应性纳米凝胶的使用提供了一个多功能平台，从该平台可以调节树脂和复合材料的处理性能，同时可控地减少挑战牙科牙科清洁剂的粘合剂结合的聚合收缩和应力发展。
This study demonstrates the effects of nano-scale prepolymer particles as additives to model dental monomer and composite formulations. Discrete nanogel particles were prepared by solution photopolymerization of isobornyl methacrylate and urethane dimethacrylate in the presence of a chain transfer agent, which also provided a means to attach reactive groups to the prepolymer. Nanogel was added to triethylene glycol dimethacrylate (TEGDMA) in increments between 5 and 40 wt% with resin viscosity, reaction kinetics, shrinkage, mechanical properties, stress and optical properties evaluated. Maximum loading of barium glass filler was determined as a function of nanogel content and composites with varied nanogel content but uniform filler loading were compared in terms of consistency, conversion, shrinkage and mechanical properties. High conversion, high molecular weight internally crosslinked and cyclized nanogel prepolymer was efficiently prepared and redispersed into TEGDMA with an exponential rise in viscosity accompanying nanogel content. Nanogel addition at any level produced no deleterious effects on reaction kinetics, conversion or mechanical properties, as long as reactive nanogels were used. A reduction in polymerization shrinkage and stress was achieved in proportion to nanogel content. Even at high nanogel concentrations, the maximum loading of glass filler was only marginally reduced relative to the control and high strength composite materials with low shrinkage were obtained. The use of reactive nanogels offers a versatile platform from which resin and composite handling properties can be adjusted while the polymerization shrinkage and stress development that challenge the adhesive bonding of dental restoratives are controllably reduced.
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影响因子：
5
作者：
Atai, Mohammad;Ahmadi, Mehdi;Watts, David C.
通讯作者：
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影响因子：
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DOI：
10.1002/jbm.b.30088
发表时间：
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影响因子：
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影响因子：
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作者：
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