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Hydroxyapatite coating on magnesium with MgF2 interlayer for enhanced corrosion resistance and biocompatibility

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Abstract

Hydroxyapatite (HA) was coated onto pure magnesium (Mg) with an MgF2 interlayer in order to reduce the surface corrosion rate and enhance the biocompatibility. Both MgF2 and HA were successfully coated in sequence with good adhesion properties using the fluoride conversion coating and aerosol deposition techniques, respectively. In a simulated body fluid (SBF), the double layer coating remarkably enhanced the corrosion resistance of the coated Mg specimen. The in vitro cellular responses of the MC3T3-E1 pre-osteoblasts were examined using a cell proliferation assay and an alkaline phosphatase (ALP) assay, and these results demonstrated that the double coating layer also enhanced cell proliferation and differentiation levels. In the in vivo study, the HA/MgF2 coated Mg corroded less than the bare Mg and had a higher bone-to-implant contact (BIC) ratio in the cortical bone area of the rabbit femora 4 weeks after implantation. These in vitro and in vivo results suggested that the HA coated Mg with the MgF2 interlayer could be used as a potential candidate for biodegradable implant materials.

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Acknowledgments

This research was supported by WCU (World Class University) project through National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R31-2008-000-10075-0) and by the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

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Authors and Affiliations

  1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea

    Ji-Hoon Jo, Bong-Gyu Kang, Kwang-Seon Shin & Hyoun-Ee Kim

  2. Functional Ceramics Group, Functional Materials Division, Korea Institute of Materials Science (KIMS), Changwon, Gyeong-Nam, 641-010, Republic of Korea

    Byung-Dong Hahn & Dong-Soo Park

  3. Department of Dental Laboratory Science and Engineering, Korea University, Seoul, 136-706, Republic of Korea

    Young-Hag Koh

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  1. Ji-Hoon Jo
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Correspondence to Hyoun-Ee Kim.

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Jo, JH., Kang, BG., Shin, KS. et al. Hydroxyapatite coating on magnesium with MgF2 interlayer for enhanced corrosion resistance and biocompatibility. J Mater Sci: Mater Med 22, 2437–2447 (2011). https://doi.org/10.1007/s10856-011-4431-3

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  • DOI: https://doi.org/10.1007/s10856-011-4431-3

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