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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 effects of NCW addition on the mechanical properties and dissolution rate of glass ionomer cement (GIC) were investigated experimentally. NCW was chosen as the modified material, and the materials were uniformly mixed with GIC powders by the mass ratio of 0 wt.%, 0.5 wt.%, 1.0 wt.% And 1.5 wt.% Respectively. The compressive strength, flexural strength , Microhardness and bond strength. The fracture appearance of the samples was observed by SEM. The composite was soaked in artificial saliva for 30 days and the solubility of the material was evaluated by Paffenbarger gravimetric method. The results showed that the microhardness, flexural strength and cohesive strength of NCW composites were all improved after adding NCW (P <0.05). The addition of 1.0wt.% NCW increased the maximum, but the compressive strength decreased (P < 0.05). With the addition of NCW, the dissolution rate of GIC first increased and then decreased (P <0.05). This shows that adding appropriate NCW GIC flexural strength and bond strength is improved, the solubility has a certain impact. These results provide basic data for clinically modified GICs and their in-depth study.