title: Suppression effects of dental glass-ceramics with polarization-induced highly dense surface charges against bacterial adhesion.
abstract: This study investigated the surface characteristics and antibacterial ability capacity of surface-improved dental glass-ceramics by an electrical polarization process. Commercially available dental glass-ceramic materials were electrically polarized to induce surface charges in a direct current field by heating. The surface morphology, chemical composition, crystal structure, and surface free energy (SFE) were evaluated using scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, and water droplet methods, respectively. The antibacterial capacity was assessed by a bacterial adhesion test using Streptococcus mutans. Although the surface morphology, chemical composition, and crystal structure were not affected by electrical polarization, the polar component and total SFE were enhanced. After 24 h incubation at 37ºC, bacterial adhesion to the polarized samples was inhibited. The electrical polarization method may confer antibacterial properties on prosthetic devices, such as porcelain fused to metal crowns or all ceramic restorations, without any additional bactericidal agents.
authors.affiliation: Department of Material Biofunctions, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Nozaki
authors.forename: Hiroki
authors.initials: H
authors.lastname: Koizumi
authors.forename: Naohiro
authors.initials: N
authors.lastname: Horiuchi
authors.forename: Miho
authors.initials: M
authors.lastname: Nakamura
authors.forename: Toshinori
authors.initials: T
authors.lastname: Okura
authors.forename: Kimihiro
authors.initials: K
authors.lastname: Yamashita
authors.forename: Akiko
authors.initials: A
authors.lastname: Nagai
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001422:Bacterial Adhesion / Q000187:drug effects*; D002516:Ceramics / Q000494:pharmacology*; D003764:Dental Materials / Q000494:pharmacology*; D006358:Hot Temperature; D008422:Materials Testing; D013295:Streptococcus mutans / Q000187:drug effects; D013499:Surface Properties
chemical_list: D000900:Anti-Bacterial Agents; D003764:Dental Materials; C023506:Glass ceramics