Mechanical, in vitro antimicrobial, and biological properties of plasma-sprayed silver-doped hydroxyapatite coating.
Implant-related infection is one of the key concerns in total joint hip arthroplasties. To reduce bacterial adhesion, we used silver (Ag)/silver oxide (Ag(2)O) doping in plasma sprayed hydroxyapatite (HA) coating on titanium substrate. HA powder was doped with 2.0, 4.0, and 6.0 wt % Ag, heat-treated at 800 °C and used for plasma spray coating using a 30 kW plasma spray system, equipped with supersonic nozzle. Application of supersonic plasma nozzle significantly reduced phase decomposition and amorphous phase formation in the HA coatings as evident by X-ray diffraction (XRD) study and Fourier transformed infrared spectroscopic (FTIR) analysis. Adhesive bond strength of more than 15 MPa ensured the mechanical integrity of the coatings. Resistance against bacterial adhesion of the coatings was determined by challenging them against Pseudomonas aeruginosa (PAO1). Live/dead staining of the adherent bacteria on the coating surfaces indicated a significant reduction in bacterial adhesion due to the presence of Ag. In vitro cell-material interactions and alkaline phosphatase (ALP) protein expressions were evaluated by culturing human fetal osteoblast cells (hFOB). Our results suggest that the plasma-sprayed HA coatings doped with an optimum amount of Ag can have excellent antimicrobial property without altering mechanical property of the Ag-doped HA coatings.
W. M. Keck Biomedical Materials Research Laboratory School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USA.
Mangal
M
Roy
Gary A
GA
Fielding
Haluk
H
Beyenal
Amit
A
Bandyopadhyay
Susmita
S
Bose
D000469:Alkaline Phosphatase / Q000378:metabolism; D000890:Anti-Infective Agents / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000494:pharmacology*; D017886:Durapatite / Q000494:pharmacology*; D005333:Fetus / Q000166:cytology; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D050296:Microbial Viability / Q000187:drug effects; D018613:Microscopy, Confocal; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects / Q000201:enzymology / Q000648:ultrastructure; D058626:Plasma Gases / Q000737:chemistry*; D012834:Silver / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D000890:Anti-Infective Agents; D020099:Coated Materials, Biocompatible; D058626:Plasma Gases; D012834:Silver; D017886:Durapatite; D000469:Alkaline Phosphatase