3D打印载银氧化石墨烯改性义齿基托复合涂层的性能

Properties of 3D-printed denture base composite film containing silver nanoparticles loaded graphene oxide

通过静电吸附作用和化学还原反应在GO片层原位负载Ag NPs,再与聚甲基丙烯酸甲酯(PMMA)混合后通过3D打印得到义齿基托复合涂层。使用透射电镜(TEM)和扫描电镜(SEM)考察了AgNPs-GO的形貌,利用X射线光电子能谱(XPS)表征了AgNPs-GO表面元素及其价态,测试了义齿基托复合涂层的机械性能和抗菌性能。结果发现,不同结构的AgNPs原位分布在褶皱的GO片层上,颗粒尺寸为10~50 nm。XPS证实了化学还原反应的发生及GO片层上同时存在着AgNPs和Ag^(+)。Ag NPs-GO在复合涂层中均匀分散,添加AgNPs-GO使PMMA涂层的弯曲模量从(687.81±28.26)MPa增大到(746.42±20.45)MPa,弯曲强度从(24.52±1.95)MPa增大到(30.06±1.58)MPa。GO提升义齿基托材料机械性能的同时发挥其自身抗菌性,协同AgNPs增强了义齿基托材料的抗菌性能。

Silver nanoparticles loaded graphene oxide(AgNPs-GO) nanocomposites were synthesized via electrostatic interaction and chemical reduction,and then mixed with poly(methyl methacrylate)(PMMA) to prepare a denture base composite film by 3D printing.The morphology of AgNPs-GO was characterized by transmission electron microscopy(TEM)and scanning electron microscopy(SEM),and the elements and their valence states on AgNPs-GO surface were analyzed by X-ray photoelectron spectroscopy(XPS).The mechanical and antibacterial properties of the composite film were tested.It was observed that AgNPs of different shapes with a diameter of 10-50 nm were dispersed uniformly on the surface of the wrinkled GO.The result of XPS analysis confirmed that chemical reduction was occurred and there existed AgNPs and Ag~+on the surface of GO.AgNPs-GO nanocomposites were dispersed uniformly in the composite film,increasing the flexural modulus of denture base composite material from(687.81 ± 28.26) MPa to(746.42 ± 20.45) MPa and the flexural strength from(24.52 ± 1.95) MP to(30.06 ± 1.58) MPa.The addition of GO not only strengthens the mechanical properties of denture base material,but improves its antibacterial activity with a synergistic effect in combination with AgNPs.