title: Effect of silver ion coating of fixed orthodontic retainers on the growth of oral pathogenic bacteria.
abstract: Titanium and stainless steel wires used for retainers in orthodontic procedures were coated with Ag ions and the effects of the coating on common oral pathogens and their pathogenicity were investigated. Two species of cariogenic and three species of periodontopathic bacteria were assessed. Biofilms of Streptococcus sobrinus and two VSC gases produced by P. gingivalis were also examined. Ag ion-coated wires showed marked antibacterial activities compared with uncoated wires; in most cases, the differences were statistically significant (p<0.05). All Ag ion-coated wires (Ti+ and SS+ wires) displayed more than 2-mm diameter bacteria growth-resistant zones around them in radial diffusion tests. Ag ion release was 0.043±0.005 ppm in 24 h that didn't show cytotoxicity. Thus, these results suggest that a simple Ag ion coating on pure titanium and stainless steel wires can restrict growth and pathogenic activities of oral pathogenic bacteria, even in the early stages of culture.
authors.affiliation: Department of Orthodontics, School of Dental Medicine, Tsurumi University.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Morita
authors.forename: Susumu
authors.initials: S
authors.lastname: Imai
authors.forename: Ai
authors.initials: A
authors.lastname: Hanyuda
authors.forename: Khairul
authors.initials: K
authors.lastname: Matin
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Hanada
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Nakamura
mesh_terms: D001419:Bacteria / Q000254:growth & development*; D018441:Biofilms; D002460:Cell Line; D006801:Humans; D009055:Mouth / Q000382:microbiology*; D018704:Orthodontic Retainers; D012834:Silver
chemical_list: D012834:Silver