纳米纤维素晶须对新型玻璃离子水门汀增韧作用的影响

目的针对玻璃离子水门汀（GIC）强韧性匹配问题，通过添加ZrO2、CeO2和TiO2制成新型玻璃离子水门汀（简称GIC—ZCT），并选用纳米纤维素晶须（NCW）增韧。方法测定材料的抗弯强度、粘结强度、显微硬度，并将该复合材料浸泡在人工唾液中30d，用Paffenbarger测重法评价材料的溶解性，采用SEM观察表面形貌。结果在GIC．ZCT中添加NCW改性后，复合材料的弯曲强度、显微硬度、粘结强度均得到提高（P〈0．05），加入1．25wt．％NCW提高最大。GIC—ZCT的溶解率，随着添加NCW质量的增加，其溶解率先增大后减小（P〈0．05）。结论这说明添加纳米纤维素晶须起到一定的增韧作用，提高GIC—ZCT力学性能，对溶解性也有一定的影响，同时能满足口腔临床的应用。

Enhancing effect of nano-cellulose whisker on the toughness of glass-ionomer cement

Objective To solve the matching problem of glass-ionomer cement toughness, by adding ZrO2 , CeO2 and TiO2 to make a new type of glass-ionomer cement-ZrO2 CeO2 TiO2 （GIC-ZCT） , and using nano-cellulose whisker （NCW） to enhance its toughness. Methods Measuring the bending strength, microhardness, bonding strength and solubility of the material, which was immersed in artificial saliva for 30 days by Paffenbarger＇ s weighing method, and observed the surface morphological changes by scanning electron microscopy before and after the dissolution. Results The results showed that after changing the properties by adding NCW into GIC-ZCT, all the bending strength, microhardness, bonding strength of this composite material were improved （P 〈 0. 05 ） , and the high point of the changing line was 1.25 wt. % NCW. It improved the largest dissolution rate of GIC-ZCT at first then decreased with the in- crease of adding NCW （P 〈 0.05 ） GIC-ZCT, improve its mechanical clinical application in stomatology. Conclusions Adding NCW can properly enhance the toughness of property, and influence its solubility, yet it can still fulfill the needs of