Enhancing biocompatibility and corrosion resistance of Mg implants via surface treatments

Oxide coating layers were formed on a pure magnesium (Mg) substrate through anodization and micro-arc oxidation (MAO) in order to enhance the biocompatibility and reduce the degradation rate. A thin, smooth MgO coating layer was formed after the anodization. On the other hand, when the Mg was treate...

Full description

Saved in:
Bibliographic Details
Published inJournal of biomaterials applications Vol. 27; no. 4; p. 469
Main Authors Jo, Ji-Hoon, Hong, Ji-Yeon, Shin, Kwang-Seon, Kim, Hyoun-Ee, Koh, Young-Hag
Format Journal Article
LanguageEnglish
Published England 01.11.2012
Subjects
Animals
Cell Adhesion
Cell Line
Cell Proliferation
Coated Materials, Biocompatible - chemistry
Coated Materials, Biocompatible - metabolism
Corrosion
Magnesium - chemistry
Magnesium - metabolism
Materials Testing
Mice
Oxidation-Reduction
Prostheses and Implants
Surface Properties
Online AccessGet more information

Cover

More Information
Summary:Oxide coating layers were formed on a pure magnesium (Mg) substrate through anodization and micro-arc oxidation (MAO) in order to enhance the biocompatibility and reduce the degradation rate. A thin, smooth MgO coating layer was formed after the anodization. On the other hand, when the Mg was treated using the MAO process, a relatively thick, rough MgO layer was formed. The corrosion properties were investigated using electrochemical and ion release tests in a simulated body fluid. Both the anodization and the MAO treatment enhanced the corrosion resistance of the Mg specimens. However, the MgO layers that formed on the surface were not stable enough to render favorable environments for cell growth. The anodized and MAO-treated specimens were post-treated in a cell-culturing medium in order to improve the stability of the coating layer. The biocompatibility was evaluated using in vitro cell tests, including cell attachment, DNA measurement, and alkaline phosphatase (ALP) activity tests. The DNA levels of the surface-treated Mg were about 6-10 times higher than the bare Mg. The ALP activity levels were also more than double after either the anodization or the MAO followed by the post-treatments. These results demonstrated that the biocompatibility and the corrosion resistance of Mg were significantly improved by the series of surface treatments.
ISSN:1530-8022
DOI:10.1177/0885328211412633