title: In vitro anti-bacterial and biological properties of magnetron co-sputtered silver-containing hydroxyapatite coating.
abstract: Bacterial infection after implant placement is a significant rising complication. In order to reduce the incidence of implant-associated infections, several biomaterial surface treatments have been proposed. In this study, the effect of in vitro antibacterial activity and in vitro cytotoxicity of co-sputtered silver (Ag)-containing hydroxyapatite (HA) coating was evaluated. Deposition was achieved by a concurrent supply of 10 W to the Ag target and 300 W to the HA target. Heat treatment at 400 degrees C for 4 h was performed after 3 h deposition. X-ray diffraction, contact angles measurements, and surface roughness were used to characterize the coating surfaces. The RP12 strain of Staphylococcus epidermidis (ATCC 35984) and the Cowan I strain of Staphylococcus aureus were used to evaluate the antibacterial activity of the Ag-HA coatings, whereas human embryonic palatal mesenchyme cells, an osteoblast precursor cell line, were used to evaluate the in vitro cytotoxicity of the coatings. X-ray diffraction analysis performed in this study indicated peaks corresponding to Ag and HA on the co-sputtered Ag-HA surfaces. The contact angles for HA and Ag-HA surfaces were observed to be significantly lower when compared to Ti surfaces, whereas no significant difference in surface roughness was observed for all groups. In vitro bacterial adhesion study indicated a significantly reduced number of S. epidermidis and S. aureus on Ag-HA surface when compared to titanium (Ti) and HA surfaces. In addition, no significant difference in the in vitro cytotoxicty was observed between HA and Ag-HA surfaces. Overall, it was concluded that the creation of a multifunctional surface can be achieved by co-sputtering the osteoconductive HA with antibacterial Ag.
authors.affiliation: University of Tennessee Health Science Center, Memphis, TN 38163, USA.
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: H S
authors.initials: HS
authors.lastname: Courtney
authors.forename: M
authors.initials: M
authors.lastname: Bettenga
authors.forename: C M
authors.initials: CM
authors.lastname: Agrawal
authors.forename: J D
authors.initials: JD
authors.lastname: Bumgardner
authors.forename: J L
authors.initials: JL
authors.lastname: Ong
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D017886:Durapatite / Q000737:chemistry* / Q000494:pharmacology* / Q000633:toxicity; D006801:Humans; D008422:Materials Testing; D012834:Silver / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013212:Staphylococcus epidermidis / Q000187:drug effects; D014961:X-Ray Diffraction
chemical_list: D000900:Anti-Bacterial Agents; D012834:Silver; D017886:Durapatite