Low Shrinkage Dental Resins from SOC Oligomers

描述(由申请人提供)：聚合收缩和 伴随的压力发展一直是显著的限制因素 牙科聚合物的性能。体积收缩，这会导致一些 来自所有常规聚合工艺的度数，负责 边缘缝隙形成、微裂纹和牙齿弯曲。底切空腔 制备、复杂的多步键合前处理及应用 增量层修复剂都是牙医必须做出的让步 处理聚合收缩问题。与以下方面相关的缺点 聚合收缩在各种聚合物应用中都有体现。 超越了牙科；因此，在这里实现的实际解决方案 潜力将是非常深远的。这次调查的重点是这两个 螺环原碳酸酯(SOC)的开环聚合 体积膨胀通常为2.5%至3.5%。虽然数量很大 自#年首次引入以来，这一领域已经取得了成就。 20世纪70年代，对这一问题的基本理解仍然存在一些明显的差距 独特的聚合工艺。知识库中的这些缺陷是 对在努力中遇到的困难负有主要责任 将SOC单体与其他单体体系进行整合。因此，这一计划的目标是 项目是：1)高效测定SOC光聚合动力学 阳离子引发剂体系；2)鉴定 模型SOC单体的阳离子光聚合；3)开发一种实用的 阳离子开环的多功能SOC齐聚物 通过形成交联剂进行聚合；以及4)展示了 阳离子/自由基可见光固化树脂和复合材料 具有最小收缩和应力发展的杂化网络聚合物。在 结束，对复杂SOC开环的基本理解 光聚合过程，到目前为止还没有实现，将 出现了一种实用的阳离子/自由基双固化树脂体系 只会产生交联型聚合物。当前应用程序提供了一个 SOC开发的替代方法，承认存在以下缺陷 已经阻止了这项技术，并提供了补救措施，以解决每一个 潜在的负面影响。关于杂化材料的信息 将直接应用于改进的牙科修复体的开发 收缩最小，应力最小。

DESCRIPTION (provided by applicant): Polymerization shrinkage and the accompanying stress development have been significant limiting factors in the performance of Dental polymers. The volumetric shrinkage, which results in some degree from all conventional polymerization processes, is responsible for marginal gap formation, microcracking and tooth flexure. Undercut cavity preparations, complicated multistep bonding pretreatments and application of restoratives in incremental layers are all concessions the Dentist must make to deal with the polymerization shrinkage issue. Shortcomings related to polymerization shrinkage are echoed in a wide variety of polymer applications that extend beyond Dentistry; therefore, practical solutions achieved here have the potential to be very far-reaching. This investigation focuses on the double ring-opening polymerization of Spiro-orthocarbonates (SOC), which occurs with volumetric expansions typically of 2.5 to 3.5 percent. While substantial accomplishments have been made in this field since its initial introduction in the 1970s, there remain some glaring gaps in the basic understanding of this unique polymerization process. These deficiencies in the knowledge base are largely responsible for the difficulties that have been encountered in efforts to integrate SOC monomers with other monomer systems. Thus, the goals of this project are to: 1) determine SOC photopolymerization kinetics with efficient cationic initiator systems; 2) identify the polymeric structures generated by cationic photopolymerization of model SOC monomers; 3) develop a practical multifunctional SOC oligomer that undergoes cationic ring-opening polymerization via cross-link formation; and 4) demonstrate the potential of cationic/free radical, visible light cured resins and composites that produce hybrid network polymers with minimal shrinkage and stress development. In the end, a fundamental understanding of the complex SOC ring-opening photopolymerization process, which has not been available to this point, will emerge along with a practical cationic/free radical dual cure resin system that will produce only cross-linked polymers. The current application offers an alternative approach to SOC development that acknowledges the deficiencies that have held back this technology and provides remedies that will address each of the potential negative areas. The information gained on the hybrid materials will be directly applicable to the development of improved Dental restoratives with minimal shrinkage and stress.