Comparison of physical Characteristics and cell culture test of hydroxyapatite/collagen composite coating on NiTi SMA: electrochemical deposition and chemically biomimetic growth

摘要

A hydroxyapatite(HA)/collagen(COL)composite coating on NiTi shape memory alloy (SMA)was prepared by electrochemical deposition(ELD)in modified simulated body fluid (MSBF).To draw comparisons of physical characteristics and bioactivity of the composite coating,the HA/COL composite coating was also prepared by chemically biomimetic growth (BG)and the ELD coating was re-soaked in MSBF again for further biomimetic growth(called EBG method in this paper).It was indicated that the c-axis of HA crystals was oriented parallel to the longitudinal direction of the COL fibril in BG and EBG coating,which could not found in ELD coating.The EBG method could induce a denser,thicker and better crystallized HA/COL coating.The cell culture test indicated that the BG coating presented better cell biocompatibility.