title: In vitro antibacterial activity and cytocompatibility of bismuth doped micro-arc oxidized titanium.
abstract: Chemical manipulations of the implant surface produce a bactericidal feature to prevent infections around dental implants. Despite the successful use of bismuth against mucosal and dermis infections, the antibacterial effect of bismuth in the oral cavity remains under investigation. The aim of this study was to evaluate the antibacterial activities of bismuth compounds against Actinobacillus actinomycetemcomitans, Staphylococcus mutans, and methicillin-resistant Staphylococcus aureus (MRSA), and to investigate the antimicrobial effects of bismuth doped micro-arc oxidation (MAO) titanium via an agar diffusion test. Cell viability, alkaline phosphatase activity, and mineralization level of MG63 osteoblast-like cells seeded on the coatings were evaluated at 1, 7, and 14 days. The results demonstrate that bismuth nitrate possess superior antibacterial activity when compared with bismuth acetate, bismuth subgallate, and silver nitrate. The bismuth doped MAO coating (contained 6.2 atomic percentage bismuth) had good biological affinities to the MG63 cells and showed a higher antibacterial efficacy against Actinobacillus actinomycetemcomitans and MRSA, where the reduction rates of colony numbers is higher than that of the control group by 1.5 and 1.9 times, respectively. These in vitro evaluations demonstrate that titanium implants with bismuth on the surface may be useful for better infection control.
authors.affiliation: Department of Dental Hygiene, China Medical University, Taichung, Taiwan.
authors.forename: Dan-Jae
authors.initials: DJ
authors.lastname: Lin
authors.forename: Ming-Tzu
authors.initials: MT
authors.lastname: Tsai
authors.forename: Tzong-Ming
authors.initials: TM
authors.lastname: Shieh
authors.forename: Heng-Li
authors.initials: HL
authors.lastname: Huang
authors.forename: Jui-Ting
authors.initials: JT
authors.lastname: Hsu
authors.forename: Yi-Chun
authors.initials: YC
authors.lastname: Ko
authors.forename: Lih-Jyh
authors.initials: LJ
authors.lastname: Fuh
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001672:Biocompatible Materials; D001729:Bismuth; D002460:Cell Line; D006801:Humans; D066298:In Vitro Techniques; D008826:Microbial Sensitivity Tests; D010006:Osteoblasts / Q000166:cytology / Q000201:enzymology; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D013499:Surface Properties; D014025:Titanium
chemical_list: D000900:Anti-Bacterial Agents; D001672:Biocompatible Materials; D014025:Titanium; D000469:Alkaline Phosphatase; D001729:Bismuth