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Thiol-ene functionalized siloxanes for use as elastomeric dental impression materials

机译:用作弹性牙科印模材料的硫醇-烯官能化硅氧烷

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摘要

Objectives. 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. Methods. 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 T_g, storage modulus, and creep behavior are determined by DMA. Results. 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. Significance. 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.
机译:目标。合成并评价了巯基和烯丙基官能化的硅氧烷低聚物,并将其用作自由基介导的快速固化的弹性牙科印模材料。使用氧化还原引发的聚合方案使硫醇-烯硅氧烷制剂交联,并且通过掺入不同程度的增塑剂和高岭土填料来控制硫醇-烯网络的机械性能。进一步评估了具有中等和轻质体稠度的制剂在总水平和微观水平上准确复制特征的能力。我们假设硫醇-烯官能化的硅氧烷体系比具有可比浓度的市售聚乙烯基硅氧烷(PVS)材料具有更快的固化时间和更大的细节再现性。方法。制备由不同含量的氧化还原引发剂,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,并评估其聚合速度(FTIR),稠度(ISO4823.9.2)和表面能(测角计)。通过SEM定量评估特征复制。 T_g,储能模量和蠕变行为由DMA确定。结果。氧化还原引发速率的增加会增加聚合速率,但是高含量也会限制工作时间。将0.86 wt%的氧化剂与最多5 wt%的增塑剂混合使用,工作时间为3分钟,凝固时间为2分钟。所选择的中轻体硫醇-烯配方还比商业材料和再现的千分尺图案具有更高的定性细节再现,精度达到98%。意义。改善细节复制和设置速度是牙科印模材料设计和合成的主要重点。自由基介导的聚合反应,特别是硫醇-烯反应,因其速度快,收缩率降低和“喀哒”性质而得到公认。

著录项

  • 来源
    《Dental materials》 |2014年第4期|449-455|共7页
  • 作者单位

    Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0596, USA;

    Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0596, USA;

    University of Colorado, 3415 Colorado Avenue, JSC Biotech Building, UCB596, Boulder, CO 80309-0596, USA,Biomaterials Research Center, School of Dentistry, University of Colorado Health Sciences Center, Aurora, CO 80045, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Impression material; Thiol-ene; Siloxane; Redox polymerization; Free radical;

    机译:印象材料;硫代烯;硅氧烷氧化还原聚合;自由基;
  • 入库时间 2022-08-18 03:46:56

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