电火花沉积内植体微槽表面抗菌改性

Antibacterial Modification of Implants Microgroove Surface by EDM Deposition

为了实现在复杂内植体表面抗菌改性,采用银作为抗菌物质,通过电火花沉积技术将银添加在内植体表面。使用电火花沉积电源,将工件链接负级,工具电极链接正极,将工具电极的材料转移到工件上。使用X射线衍射观测加工后样品的表面物相组成;采用激光共聚焦与扫描电镜观测加工后的表面形貌;通过抗菌试验测定加工后样品的抗菌性能。结果表明,采用电火花沉积加工的方法能够在复杂的结构表面构含银的微结构。加工后样品对液体具有良好的接触性能。样品表面银的尺寸越小,抗菌性能越良好,抗菌率最高达到100%。抗菌的机理为银的微结构水解成银离子作为抗菌剂。该方法具有操作简单、良好的表面适应性和制备样品稳定等优点。

In order to achieve antimicrobial modification on the surface of complex implants,silver was used as an antimicrobial substance to deposit silver on the implant surface by EDM deposition.The electric spark deposition power supply was used to connect the workpiece to the negative stage and the tool electrode to the positive electrode to transfer the material of the tool electrode to the workpiece.The surface phase composition of the processed samples was observed by X-ray diffraction.The surface morphology of the processed samples was observed by laser scanning confocal microscope and scanning electron microscopy.The antimicrobial properties of the processed samples were determined by antimicrobial testing.The results show that the EDM deposition method is able to construct silver-containing microstructures on the surface.After processing,the sample has good contact performance with liquid.The smaller the size of silver,the better the antibacterial properties.The antibacterial mechanism is that the microstructure of silver is hydrolyzed into silver ions as an antibacterial agent.The method has the advantages of simple operation,good surface adaptability and stable sample preparation.