Vallittu P K
University of Kuopio, Faculty of Dentistry, Finland.
J Prosthet Dent. 1994 Jun;71(6):613-7. doi: 10.1016/0022-3913(94)90447-2.
This study determined the effect of polymerization shrinkage of polymethyl methacrylate (PMMA) coating of fiber roving on the transverse strength of an acrylic resin-glass fiber composite. The test specimens were heat-cured acrylic resin reinforced with glass fibers. The glass fiber rovings were treated with four PMMA-MMA mixtures (30 specimens per group) of various ratios assumed to have different amounts of polymerization shrinkage. A transverse strength test was used to determine the fracture resistance of the test specimens and the polymerization shrinkage of the PMMA-MMA mixtures was measured. After the specimens were fractured, single glass fibers used to reinforce the test specimens were studied by SEM. The fracture resistance of the specimens was statistically different (p < 0.001) among treatments, and the polymerization shrinkage of the PMMA-MMA mixture also varied as the calculations predicted. The SEM micrographs showed differences in thickness of the acrylic resin layer on the surface of the fibers with PMMA-MMA mixtures of various ratios. According to the results, the ratio that caused only minor polymerization shrinkage of PMMA in the glass fiber roving improved the fracture resistance of the test specimens and seemed to increase the amount of PMMA inside the fiber roving.
本研究确定了纤维粗纱的聚甲基丙烯酸甲酯（PMMA）涂层的聚合收缩对丙烯酸树脂 - 玻璃纤维复合材料横向强度的影响。测试样本为用玻璃纤维增强的热固化丙烯酸树脂。玻璃纤维粗纱用四种不同比例的PMMA - MMA混合物进行处理（每组30个样本），这些混合物被认为具有不同程度的聚合收缩。采用横向强度测试来确定测试样本的抗断裂性，并测量PMMA - MMA混合物的聚合收缩。样本断裂后，通过扫描电子显微镜（SEM）研究用于增强测试样本的单根玻璃纤维。各处理组样本的抗断裂性在统计学上存在差异（p < 0.001），并且PMMA - MMA混合物的聚合收缩也如计算预测的那样有所不同。扫描电子显微镜照片显示，不同比例的PMMA - MMA混合物使纤维表面丙烯酸树脂层的厚度存在差异。根据结果，在玻璃纤维粗纱中导致PMMA仅有轻微聚合收缩的比例提高了测试样本的抗断裂性，并且似乎增加了纤维粗纱内部PMMA的含量。
