Interface activation and surface characteristics of Ti/TiN/HA coated sintered stainless steels |
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Authors: | Han-Cheol Choe Yeong-Mu Ko |
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Affiliation: | (1) Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, Chosun University, 375, Seoseok-dong, Dong-gu, 501-200 Gwangju, Korea |
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Abstract: | Interface activation and surface characteristics of Ti/TiN/HA film coated sintered stainless steels (SSS) have been investigated
by electrochemical and biocompatibility tests. HA (hydroxyapatite), Ti, and Ti/TiN film coatings were applied using electron-beam
deposition method (EB-PVD). Ti, Ti/TiN, and Ti/TiN/HA film coated surfaces and layers were investigated by SEM and XPS. The
coated films showed micro-columnar structure, and Ti/TiN/HA films were denser than Ti or HA-only film. The corrosion resistance
of the HA coating was similar to that of Ti/TiN/HA film coating when Cu content reached 4 wt.%, but the corrosion resistance
of the HA coating decreased when Cu content increased from 4 wt.% in 0.9% NaCl solution. Therefore, HA-only coating could
ensure corrosion resistance when Cu content does not exceed 4 wt.%. The results of biocompatibility tests of SSS on dogs showed
that bone formation and biocompatibility were favorable when Cu content did not exceed 4 wt.%. The biocompatibility with bone
was generally favorable in Ti/TiN/HA film coating and HA-only coating, while bone formation was somewhat faster for the HA
film coated surface than for the Ti/TiN/HA film coating. Also, good cell growth and osseointegration without toxicity were
observed. |
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Keywords: | biocompatibility hydroxyapatite (HA) Ti/TiN/HA coating corrosion resistance osseointegration toxicity |
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