Properties of methacrylate-thiol-ene formulations as dental restorative materials.
Properties of methacrylate-thiol-ene formulations as dental restorative materials.
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DOI：
10.1016/j.dental.2010.04.005
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发表时间：
2010-08
期刊：
影响因子：
5
通讯作者：
Bowman, Christopher N.
中科院分区：
文献类型：
--
作者：
Cramer, Neil B.;Couch, Charles L.;Schreck, Kathleen M.;Boulden, Jordan E.;Wydra, Robert;Stansbury, Jeffrey W.;Bowman, Christopher N.
本研究的目的是评估三元甲基丙烯酸酯-硫醇-烯系统，具有不同的硫醇-烯含量和硫醇：烯化学计量，作为牙科修复树脂材料。假设非化学计量的硫醇-烯组分将增强甲基丙烯酸酯和硫醇-烯过程之间的相互作用，以降低收缩应力，同时保持等效的机械性能。通过傅里叶变换红外光谱（FTIR）测定聚合动力学和官能团转化率。固化树脂的机械性能进行了评估，使用三点弯曲试验，进行了液压通用测试系统。聚合收缩应力用张力计测量，同时实时监测转化率。将硫醇-烯混合物作为反应性稀释剂掺入常规二甲基丙烯酸酯树脂中，先前已显示出联合收割机协同地将有利的甲基丙烯酸酯机械性能与硫醇-烯体系的改进的聚合动力学和降低的收缩应力结合。在这些系统中，由于硫醇-烯反应和涉及甲基丙烯酸酯聚合的链转移两者产生的硫醇消耗，最佳硫醇：烯化学计量偏离传统的1：1比率。相对于1：1化学计量的硫醇：烯体系，将硫醇：烯化学计量增加至3：1导致体系具有相等的挠曲模量、6 - 20%降低的挠曲强度和5 - 33%降低的收缩应力。由于它们改善的总体官能团转化率和收缩应力降低，同时保持相等的挠曲模量，甲基丙烯酸酯-硫醇-烯树脂，特别是具有过量硫醇的那些，超过常规的1：1硫醇：烯摩尔比，与纯二甲基丙烯酸酯树脂相比，产生上级牙科修复材料。
The objective of this study was to evaluate ternary methacrylate-thiol-ene systems, with varying thiol-ene content and thiol:ene stoichiometry, as dental restorative resin materials. It was hypothesized that an off-stoichiometric thiol-ene component would enhance interactions between the methacrylate and thiol-ene processes to reduce shrinkage stress while maintaining equivalent mechanical properties. Polymerization kinetics and functional group conversions were determined by Fourier transform infrared spectroscopy (FTIR). Cured resin mechanical properties were evaluated using a three-point flexural test, carried out with a hydraulic universal test system. Polymerization shrinkage stress was measured with a tensometer coupled with simultaneous real-time conversion monitoring. The incorporation of thiol-ene mixtures as reactive diluents into conventional dimethacrylate resins previously was shown to combine synergistically advantageous methacrylate mechanical properties with the improved polymerization kinetics and reduced shrinkage stress of thiol-ene systems. In these systems, due to thiol consumption resultant from both the thiol-ene reaction and chain transfer involving the methacrylate polymerization, the optimum thiol:ene stoichiometry deviates from the traditional 1:1 ratio. Increasing the thiol:ene stoichiometry up to 3:1 results in systems with equivalent flexural modulus, 6 – 20 % reduced flexural strength, and 5 – 33 % reduced shrinkage stress relative to 1:1 stoichiometric thiol:ene systems. Due to their improved overall functional group conversion, and shrinkage stress reduction while maintaining equivalent flexural modulus, methacrylate-thiol-ene resins, particularly those with excess thiol, beyond the conventional 1:1 thiol:ene molar ratio, yield superior dental restorative materials compared with purely dimethacrylate resins.
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