Network structure of bis-GMA- and UDMA-based resin systems
Network structure of bis-GMA- and UDMA-based resin systems
复制标题
DOI：
10.1016/j.dental.2005.10.009
复制
发表时间：
2006-12-01
期刊：
影响因子：
5
通讯作者：
Dickens, Sabine H.
中科院分区：
文献类型：
--
作者：
Floyd, Cynthia J. E.;Dickens, Sabine H.
目标。常用的牙基单体2，2-bis[p-(2‘-hydroxy-3’-methacryloxypropoxy)phenylene]丙烷(BIS-GMA)和三甲基己烷(1，6-bis(methacryloxy-2-ethoxycarbonylamino)-2，4，4-)需要使用稀释剂单体，如三甘醇二甲基丙烯酸酯(TEGDMA)。本研究的目的是测量UDMA/TEGDMA和Bis-GMA/TEGDMA聚合物体系的双键转化率，确定可溶出部分，并通过评估交联键和侧链双键来分析网络的形成。UDMA或Bis-GMA与TEGDMA以系统的增量结合并辐射形成光固化聚合物。用傅里叶变换红外光谱测量了近红外区的双键转化率。用核磁共振氢谱分析了可浸出的溶胶组分。研制了树脂基复合材料配方。用三点弯曲法测定其抗折强度，用水银膨胀仪测定其体积收缩。碱单体用量对双键转化率、溶胶率和交联度有较大影响。碱单体浓度的增加降低了双键转化率，增加了可浸出分数，减少了交联度和网络的形成。在摩尔分数高于0.125的情况下，UDMA聚合物的转化率明显高于双马来酸丁二醇酯聚合物。BIS-GMA聚合物有更高的未反应单体可浸出量，而UDMA混合物比BIS-GMA混合物有更多的交联度。在树脂复合材料的物理性能方面，增加基单体含量可提高弯曲强度，降低体积收缩。这项评估转化率、可浸出性、交联度和网络结构以及物理性能(如体积收缩和弯曲强度)的系统研究，是开发耐用材料的竞争所需性能的优化所必需的。(C)2005年牙科材料学会。爱思唯尔有限公司出版。保留所有权利。
Objectives. The commonly used dental base monomers 2,2-bis[p-(2'-hydroxy-3'-methacryloxypropoxy)phenylene] propane (Bis-GMA) and 1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4- trimethylhexane (UDMA) require the use of a diluent monomer, such as triethylene glycol dimethacrylate (TEGDMA). The aim of this study was to measure double bond conversion of UDMA/TEGDMA and Bis-GMA/TEGDMA polymeric systems, determine the leachable portion, and analyze network formation by evaluating crosslinking and pendant double bonds.Methods. UDMA or Bis-GMA was combined with TEGDMA in systematic increments and irradiated to form light cured polymers. Fourier transform infrared spectroscopy in the near-infrared region was used to measure double bond conversion. The leachable Sol fraction was analyzed by H-1 NMR. Resin composites were formulated. Flexural strength was measured by three-point bending and volumetric shrinkage was determined with a mercury dilatometer.Results. The amount of base monomer greatly influenced double bond conversion, Sol fraction, and crosslinking. Increasing base monomer concentration decreased double bond conversion, increased the leachable fraction, and decreased crosslinking and network formation. At mole fractions higher than 0.125, the UDMA polymers had significantly higher conversion than the Bis-GMA polymers. Bis-GMA polymers had higher leachable amounts of unreacted monomer, while UDMA mixtures had more crosslinking than the Bis-GMA mixtures. In regards to the physical properties of resin composites, increasing the base monomer improved flexural strength and decreased volumetric shrinkage.Significance. This systematic study for the evaluation of conversion, leachability, crosslinking, and network structure along with physical properties, like volumetric shrinkage and flexural strength, are required for the optimization of competing desirable properties for the development of durable materials. (c) 2005 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.