Antibacterial coatings of fluoridated hydroxyapatite for percutaneous implants

• Published in: Journal of biomedical materials research. Part A 2010-11, Vol.95A (2), p.588-599
• Main Authors: Ge, Xiang, Leng, Yang, Bao, Chongyun, Xu, Sherry Li, Wang, Renke, Ren, Fuzeng
• Format: Article
• Language: English
• Subjects: Anti-Bacterial Agents - chemistry; Anti-Bacterial Agents - pharmacology; antibacterial; Antibacterial agents; Antibiotics. Antiinfectious agents. Antiparasitic agents; Bacteria - drug effects; Biocompatibility; Biological and medical sciences; Biomedical materials; Calcium phosphate; Coated Materials, Biocompatible - chemistry; Coatings; electrochemical deposition; Escherichia coli; fluoridated hydroxyapatite; Fluoridation; high-resolution transmission electron microscope; Humans; Hydroxyapatite; Hydroxyapatites - chemistry; Materials Testing; Medical sciences; Microbial Sensitivity Tests; percutaneous devices; Pharmacology. Drug treatments; Porphyromonas gingivalis; Prostheses and Implants; Seals; Staphylococcus aureus; Surface Properties; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Surgical implants; Technology. Biomaterials. Equipments
• ISSN: 1549-3296; 1552-4965; 1552-4965
• DOI: 10.1002/jbm.a.32862

Percutaneous orthopedic and dental implants require not only good adhesion with bone but also the ability to attach and form seals with connective tissues and the skin. To solve the skin‐seal problem of such implants, an electrochemical deposition method was used to modify the surfaces of metallic implants to improve their antibacterial ability and skin seals around them. A dense and uniform fluoridated calcium phosphate coating with a thickness of about 200 nm was deposited on an acid‐etched pure titanium substrate by controlling the current density and reaction duration of the electrochemical process. The as‐deposited amorphous fluoridated calcium phosphate transformed to fluoridated hydroxyapatite (FHA) after heat treatment at 600°C in a water vapor environment for 3 h. Both single crystal diffraction patterns and high‐resolution transmission electron microscope (HRTEM) images confirmed the phase of the fluoridated calcium phosphate after the heat treatment. The antibacterial activities of FHA coatings were tested against Staphylococcus aureus (S. aureus), Escherichia coli (E. coli), and Porphyromonas gingivalis (P. gingivalis) with the film attachment method. The antibacterial activity of FHA coating is much higher than that of pure hydroxyapatite (HA) coating and acid‐etched pure titanium surface. The promising features of FHA coating make it suitable for orthopedic and dental applications. © 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2010.