Department of Restorative Dentistry, Faculty of Dentistry, Süleyman Demirel University, Turkey.
Department of Restorative Dentistry, Faculty of Dentistry, Süleyman Demirel University, Turkey.
J Mech Behav Biomed Mater. 2023 Jun;142:105850. doi: 10.1016/j.jmbbm.2023.105850. Epub 2023 Apr 13.
To evaluate the effect of adding glass fiber and graphene oxide to a resin-modified glass ionomer cement (RMGIC).
Experimental RMGICs were prepared by adding separately and simultaneously glass fibers (5, 10, and 20 wt%) and graphene oxide (1, 3, and 5 wt%) to the powder of RMGIC with different ratios. The samples were examined under SEM and XRD. The surface roughness, flexural strength, Vickers microhardness, water sorption, and solubility were investigated. Data were analyzed using ANOVA and Tukey tests (p = 0.05).
Adding fiber and graphene oxide to RMCIS increased the surface roughness, flexural strength, and microhardness. The highest surface roughness value was obtained in the 20% fiber+5% graphene oxide adding group and the lowest in the control group (p < 0.05). The highest microhardness and flexural strength values were acquired in the 20% fiber-adding group and the lowest in the control group (p < 0.05). 10% and 20% fiber addition increased water sorption and solubility (p < 0.05). Adding 3%, 5% graphene oxide, and 20% fiber+5% graphene oxide reduced water sorption (p < 0.05). The highest water sorption was found in the 20% fiber-adding group and the lowest in the 5% graphene oxide and %20 fiber+5% graphene oxide-adding groups (p < 0.05). Graphene oxide alone and together with fiber did not affect the solubility (p > 0.05).
The results show that reinforcement of RMGIC with glass fiber and graphene oxide may improve the mechanical properties. But the glass fibers may cause more water sorption and solubility. Graphene oxide may decrease water sorption of RMGIC and fiber-reinforced RMGIC.
评估向树脂改良型玻璃离子水门汀（RMGIC）中添加玻璃纤维和氧化石墨烯对其性能的影响。
通过向 RMGIC 粉末中分别单独添加（添加比例分别为 5wt%、10wt%和 20wt%）和同时添加（添加比例分别为 1wt%、3wt%和 5wt%）玻璃纤维和氧化石墨烯制备实验性 RMGIC。使用 SEM 和 XRD 对样品进行了检查。对表面粗糙度、弯曲强度、维氏显微硬度、吸水率和溶解度进行了研究。采用方差分析和 Tukey 检验（p=0.05）对数据进行了分析。
向 RMGIC 中添加纤维和氧化石墨烯增加了表面粗糙度、弯曲强度和显微硬度。在添加 20%纤维+5%氧化石墨烯的组中获得了最高的表面粗糙度值，在对照组中获得了最低的表面粗糙度值（p<0.05）。在添加 20%纤维的组中获得了最高的显微硬度和弯曲强度值，在对照组中获得了最低的显微硬度和弯曲强度值（p<0.05）。10%和 20%纤维的添加增加了吸水率和溶解度（p<0.05）。添加 3%、5%氧化石墨烯和 20%纤维+5%氧化石墨烯降低了吸水率（p<0.05）。在添加 20%纤维的组中发现吸水率最高，在添加 5%氧化石墨烯和 20%纤维+5%氧化石墨烯的组中发现吸水率最低（p<0.05）。氧化石墨烯单独和与纤维一起使用不会影响溶解度（p>0.05）。
结果表明，用玻璃纤维和氧化石墨烯增强 RMGIC 可以提高其力学性能。但是，玻璃纤维可能会导致更高的吸水率和溶解度。氧化石墨烯可能会降低 RMGIC 和纤维增强型 RMGIC 的吸水率。
