纳米纤维素晶须对玻璃离子水门汀的性能影响

Effects of nano-cellulose whisker on the performance of glass ionomer cement

实验研究了添加纳米纤维素晶须(NCW)对玻璃离子水门汀(GIC)的力学性能及溶解率方面的影响。选用NCW为改性材料,分别按质量比0 wt.%、0.5 wt.%、1.0 wt.%、1.5 wt.%均匀混入GIC粉中常规固化,测定了改性后材料的压缩强度、弯曲强度、显微硬度、粘结强度,用扫描电镜观察了样品的断口形貌。并将复合材料浸泡在人工唾液中30天,用Paffenbarger测重法评价材料的溶解性。结果表明,添加NCW改性后,复合材料的显微硬度、弯曲强度和粘结强度均得到提高(P<0.05),其中加入1.0wt.%NCW提高最大,但压缩强度有所下降(P<0.05)。随着添加NCW质量的增加,GIC的溶解率先增大后减小(P<0.05)。这说明添加适量NCW的GIC的弯曲强度和粘结强度得到提高,对溶解性有一定的影响。这些结果为口腔临床改性GIC和对其进行深入研究提供了基础数据。

The mechanical properties and solubility of glass ionomer cement （GIC） with nano-cellulose ＇whisker（NCW） addition were experimentally studied. NCW was chosen to modify the performances of GIC. 0 wt. % ,0.5 wt. % , 1.0 wt. % and 1.5 wt. % of NCW were mixed into GIC separately, then cured ：in convention. The compressive strength, flexural strength, surface microhardness and bond strength were 1Lested. The appearance of the fracture was observed by scanning electron microscope. Furthermore, the composites were immersed into artificial saliva for 30 days, Paffenbarger measuring weight method was used to evaluate the solubility. The results showed that the surface microhardness, flexural strength and bond strength of composite were all improved （ P 〈 0.05 ） , and the improvement was most significant after adding 1.0wt. % NCW. But the compressive strength of composites decreased slightly after adding NCW （P 〈 0.05 ）. The solubility of GIC first increased and then decreased after adding NCW （ P 〈 0.05 ）. can be concluded that both the flexural strength and bond strength of GIC had improved after adding right amount of NCW, and it had a certain impact modification and further researches of GIC It on solubility. The results provided basic data for the modification and further researches of GIC.