Antonucci J M, Regnault W F, Skrtic D
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.
J Compos Mater. 2010 Feb 1;44(3):355. doi: 10.1177/0021998309345180.
This study explores how substituting a new high molecular mass oligomeric poly(ethylene glycol) extended urethane dimethacrylate (PEG-U) for 2-hydroxyethyl methacrylate (HEMA) in photo-activated urethane dimethacrylate (UDMA) resins affects degree of vinyl conversion (DC), polymerization shrinkage (PS), stress development (PSSD) and biaxial flexure strength (BFS) of their amorphous calcium phosphate (ACP) composites. The composites were prepared from four types of resins (UDMA, PEG-U, UDMA/HEMA and UDMA/PEG-U) and zirconia-hybridized ACP. Introducing PEG-U improved DC while not adversely affecting PS, PSSD and the BFS of composites. This improvement in DC is attributed to the long, more flexible structure between the vinyl groups of PEG-U and its higher molecular mass compared to poly(HEMA). The results imply that PEG-U has the potential to serve as an alternative to HEMA in dental and other biomedical applications.
本研究探讨了在光活化聚氨酯二甲基丙烯酸酯（UDMA）树脂中，用新型高分子量低聚物聚（乙二醇）扩链聚氨酯二甲基丙烯酸酯（PEG-U）替代甲基丙烯酸2-羟乙酯（HEMA），对其非晶态磷酸钙（ACP）复合材料的乙烯基转化率（DC）、聚合收缩率（PS）、应力发展（PSSD）和双轴弯曲强度（BFS）有何影响。这些复合材料由四种类型的树脂（UDMA、PEG-U、UDMA/HEMA和UDMA/PEG-U）以及氧化锆杂化的ACP制备而成。引入PEG-U提高了DC，同时对复合材料的PS、PSSD和BFS没有不利影响。DC的这种提高归因于PEG-U乙烯基之间长且更具柔性的结构及其比聚（HEMA）更高的分子量。结果表明，PEG-U在牙科和其他生物医学应用中有可能作为HEMA的替代品。
