Glass-fibre-reinforced polyetherketoneketone(PEKK-GF)shows great potential for application as a dental implant restoration material;however,its surface bioinertness and poor antibacterial properties limit its integrat...Glass-fibre-reinforced polyetherketoneketone(PEKK-GF)shows great potential for application as a dental implant restoration material;however,its surface bioinertness and poor antibacterial properties limit its integration with peri-implant soft tissue,which is critical in the long-term success of implant restoration.Herein,functional magnesium(Mg)and silver(Ag)ions were introduced into PEKK-GF by plasma immersion ion implantation(PIII).Surface characterization confirmed that the surface morphology of PEKK-GF was not visibly affected by PIII treatment.Further tests revealed that PIII changed the wettability and electrochemical environment of the PEKK-GF surface and enabled the release of Mg^(2+)and Ag^(+)modulated by Giavanni effect.In vitro experiments showed that Mg/Ag PIII-treated PEKK-GF promoted the proliferation and adhesion of human gingival fibroblasts and upregulated the expression of adhesion-related genes and proteins.In addition,the treated samples inhibited the metabolic viability and adhesion of Streptococcus mutans and Porphyromonas gingivalis on their surfaces,distorting bacterial morphology.Mg/Ag PIII surface treatment improved the soft tissue integration and antibacterial activities of PEKK-GF,which will further support and broaden its adoption in dentistry.展开更多
In this work, manufacturing tools for thermoplastic (TP) composites have been developed. The chosen process involves the stacking alternately of oriented dry fabrics and TP films and does not use semi-products in orde...In this work, manufacturing tools for thermoplastic (TP) composites have been developed. The chosen process involves the stacking alternately of oriented dry fabrics and TP films and does not use semi-products in order to reduce material costs. This study was specifically directed towards optimizing the impregnation of continuous glass and carbon fibres reinforcing two TP amorphous matrices, the polyphenylsulfone (PPSU) and polyetherimide (PEI), to obtain semi-finished products employed for aeronautical structures. The impregnation quality of inter and intra-yarns is analyzed and validated by optical and scanning micrographic observations conducted with an optical and a Scanning Electron Microscopies (SEM), respectively. The study showed that besides the process parameters and porosity distribution in the core of warp yarns, the impregnation quality depends on the surface properties of constituents. Desizing treatment has been carried out to improve the wettability of fibres by the TP matrices.展开更多
基金Qiang Wei(State Key Laboratory of Oral Diseases,West China Hospital of Stomatology,Sichuan University)for guidance in using scanning electron microscope(No.2020C017)and 3D profilometer(No.2020ACA0).
文摘Glass-fibre-reinforced polyetherketoneketone(PEKK-GF)shows great potential for application as a dental implant restoration material;however,its surface bioinertness and poor antibacterial properties limit its integration with peri-implant soft tissue,which is critical in the long-term success of implant restoration.Herein,functional magnesium(Mg)and silver(Ag)ions were introduced into PEKK-GF by plasma immersion ion implantation(PIII).Surface characterization confirmed that the surface morphology of PEKK-GF was not visibly affected by PIII treatment.Further tests revealed that PIII changed the wettability and electrochemical environment of the PEKK-GF surface and enabled the release of Mg^(2+)and Ag^(+)modulated by Giavanni effect.In vitro experiments showed that Mg/Ag PIII-treated PEKK-GF promoted the proliferation and adhesion of human gingival fibroblasts and upregulated the expression of adhesion-related genes and proteins.In addition,the treated samples inhibited the metabolic viability and adhesion of Streptococcus mutans and Porphyromonas gingivalis on their surfaces,distorting bacterial morphology.Mg/Ag PIII surface treatment improved the soft tissue integration and antibacterial activities of PEKK-GF,which will further support and broaden its adoption in dentistry.
文摘In this work, manufacturing tools for thermoplastic (TP) composites have been developed. The chosen process involves the stacking alternately of oriented dry fabrics and TP films and does not use semi-products in order to reduce material costs. This study was specifically directed towards optimizing the impregnation of continuous glass and carbon fibres reinforcing two TP amorphous matrices, the polyphenylsulfone (PPSU) and polyetherimide (PEI), to obtain semi-finished products employed for aeronautical structures. The impregnation quality of inter and intra-yarns is analyzed and validated by optical and scanning micrographic observations conducted with an optical and a Scanning Electron Microscopies (SEM), respectively. The study showed that besides the process parameters and porosity distribution in the core of warp yarns, the impregnation quality depends on the surface properties of constituents. Desizing treatment has been carried out to improve the wettability of fibres by the TP matrices.
