Thiol-ene functionalized siloxanes for use as elastomeric dental impression materials.
Thiol-ene functionalized siloxanes for use as elastomeric dental impression materials.
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DOI：
10.1016/j.dental.2014.01.011
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发表时间：
2014-04
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：
Cole, Megan A.;Jankousky, Katherine C.;Bowman, Christopher N.
硫醇和烯丙基官能化的硅氧烷低聚物的合成和评价作为自由基介导的，快速设置的弹性体牙科印模材料的使用。硫醇-烯硅氧烷制剂使用氧化还原引发的聚合方案进行交联，并且通过掺入不同程度的增塑剂和高岭土填料来操纵硫醇-烯网络的机械性能。进一步评价具有中等和轻体质量的制剂在大体和微观水平上准确复制特征的能力。我们假设硫醇-烯官能化的硅氧烷系统将表现出更快的设置时间和更大的细节再现比市售的聚乙烯基硅氧烷（PVS）材料的可比性。制备用不同水平的氧化还原引发剂、增塑剂和高岭土填料配制的硫醇-烯官能化的硅氧烷混合物，并评价其聚合速度（FTIR）、稠度（ISO4823.9.2）和表面能（测角仪）。特征复制定量评价SEM。通过DMA测定Tg、储能模量和蠕变行为。增加氧化还原引发速率会增加聚合速率，但在高水平下也会限制工作时间。结合0.86重量%的氧化剂与高达5重量%的增塑剂得到了3分钟的工作时间和2分钟的凝固时间。所选择的介质和轻体硫醇烯配方也实现了更大的质量细节再现比商业材料和再现微米模式与98%的准确度。提高细节再现和固化速度是牙科印模材料设计和合成的主要焦点。自由基介导的聚合，特别是硫醇-烯反应，因其速度、减少的收缩和“点击”性质而被公认。
Thiol- and allyl-functionalized siloxane oligomers are synthesized and evaluated for use as a radical-mediated, rapid set elastomeric dental impression material. Thiol-ene siloxane formulations are crosslinked using a redox-initiated polymerization scheme, and the mechanical properties of the thiol-ene network are manipulated through the incorporation of varying degrees of plasticizer and kaolin filler. Formulations with medium and light body consistencies are further evaluated for their ability to accurately replicate features on both the gross and microscopic levels. We hypothesize that thiol-ene functionalized siloxane systems will exhibit faster setting times and greater detail reproduction than commercially available polyvinylsiloxane (PVS) materials of comparable consistencies. Thiol-ene functionalized siloxane mixtures formulated with varying levels of redox initiators, plasticizer, and kaolin filler are made and evaluated for their polymerization speed (FTIR), consistency (ISO4823.9.2), and surface energy (goniometer). Feature replication is evaluated quantitatively by SEM. The Tg, storage modulus, and creep behavior are determined by DMA. Increasing redox initiation rate increases the polymerization rate but at high levels also limits working time. Combining 0.86 wt% oxidizing agent with up to 5 wt% plasticizer gave a working time of 3 min and a setting time of 2 min. The selected medium and light body thiol-ene formulations also achieved greater qualitative detail reproduction than the commercial material and reproduced micrometer patterns with 98% accuracy. Improving detail reproduction and setting speed is a primary focus of dental impression material design and synthesis. Radical-mediated polymerizations, particularly thiol-ene reactions, are recognized for their speed, reduced shrinkage, and ‘click’ nature.
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影响因子：
4.4
作者：
MCCROSSON, J;SHARKEY, SW;ANDERSON, RA
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ANDERSON, RA
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Endo, T
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