Surface Modification of Biomaterials in Hard Tissue Applications

摘要

Surface modification technologies are quite common in the biomedical field to improve the mechanical, chemical, physical and biological properties of implants such as artificial joint and cardiovascular devices. In this paper, recent progress in the investigation of the bioactivity and biocompatibility enhancement of implants using plasma spraying and plasma -based ion implantation (PIII) is described. Plasma sprayed hydroxyapatite (HA) coatings are commonly used as bioactive coatings but the relatively poor adhesion between the coatings and titanium is one of main disadvantages which have limited their biomedical applications. In our recent studies, novel bioactive coatings, such as wollastonite and dicalcium silicate, were deposited onto titanium to enhance the surfaces bioactivity and biocompatibility. Our results indicate that plasma sprayed wollastonite and dicalcium silicate coatings possess excellent bioactivity as well as relatively high bonding strength. Plasma immersion ion implantation was also employed to improve the anti- corrosion and biological properties of implants.