Zhang Meng, Matinlinna Jukka Pekka, Botelho Michael George, Säilynoja Eija Sinikka
Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Hong Kong SAR, People's Republic of China.
Odontology. 2014 Jul;102(2):176-83. doi: 10.1007/s10266-013-0114-5. Epub 2013 Apr 26.
The traditional fiber reinforced composite (FRC) contains bisphenol A glycidyl methacrylate (bis-GMA) in the resin matrix, which is thought to have some disadvantages. This research aimed at replacing bis-GMA with another monomer-urethane dimethacrylate (UEDMA), with the desired properties for dental use still retained. Four groups were prepared with light-curing (n = 30), one Control group with a bis-GMA-based resin matrix and three experimental groups with UEDMA-based matrices (Exper 1, Exper 2 and Exper 3 with a varying UEDMA weight percentage). Specimens were stored in dry conditions for 24 h or in deionized water for 1, 3, 6 or 12 months prior to the tests. Water sorption (n = 6), Vicker's hardness (n = 6) and flexural properties (n = 6) after each storage time were investigated. Scanning electron microscopy (SEM) images were taken at the fracture sites after 3-point bending. All the results were statistically analyzed (α = 0.05). The Exper 1 group exhibited the lowest weight increase after water storage among the experimental groups. As for dry conditions, 1- and 6-month storage, different resin matrix compositions made no significant difference to hardness, while for 3- and 12-month storage, "Control" possessed the highest hardness. The Control group's strength and modulus, Exper 1 and Exper 2's modulus were stable during water storage. Compared to other experimental groups, Exper 1 had the highest strength and modulus values with most of the storage times. SEM images showed relatively good adhesion between the fiber and the matrix. With all the tested properties considered, the Exper 1 group had superior performance among all the three experimental groups.
传统的纤维增强复合材料（FRC）在树脂基体中含有双酚A甲基丙烯酸缩水甘油酯（bis-GMA），人们认为它存在一些缺点。本研究旨在用另一种单体——聚氨酯二甲基丙烯酸酯（UEDMA）替代bis-GMA，同时仍保留牙科应用所需的性能。制备了四组光固化样本（n = 30），一组对照组使用基于bis-GMA的树脂基体，三组实验组使用基于UEDMA的基体（实验1、实验2和实验3，UEDMA重量百分比不同）。在测试前，样本在干燥条件下储存24小时，或在去离子水中储存1、3、6或12个月。研究了每次储存时间后的吸水率（n = 6）、维氏硬度（n = 6）和弯曲性能（n = 6）。在三点弯曲后，在断裂部位拍摄扫描电子显微镜（SEM）图像。所有结果均进行统计学分析（α = 0.05）。在实验组中，实验1组在储水后重量增加最少。至于干燥条件、储存1个月和6个月时，不同的树脂基体组成对硬度没有显著影响，而在储存3个月和12个月时，“对照组”硬度最高。对照组的强度和模量、实验1组和实验2组的模量在储水过程中保持稳定。与其他实验组相比，实验1组在大多数储存时间下具有最高的强度和模量值。SEM图像显示纤维与基体之间的粘附性相对较好。综合所有测试性能来看，实验1组在所有三个实验组中表现出卓越的性能。
