title: Antibacterial activity of resin composites containing surface pre-reacted glass-ionomer (S-PRG) filler.
abstract: A surface pre-reacted glass-ionomer (S-PRG) filler is a technology of interest for providing bio-functions to restorative materials. Resin composites containing S-PRG filler have been reported to show less plaque accumulation and reduced bacterial attachment. In this study, experimental resin composites containing S-PRG filler at various concentrations were fabricated, and the inhibitory effects on bacterial growth on their surface and the association of ions released from S-PRG filler with antibacterial activity were evaluated.
  
  
  
  Five kinds of experimental resin composites containing S-PRG filler at 0, 13.9, 27.3, 41.8, or 55.9 (vol.%) were fabricated. Streptococcus mutans was cultured on the cured discs for 18h to examine the growth of bacteria in contact with the surface of the experimental resins. The concentrations of Al(3+), BO3(3-), F(-), Na(+), SiO3(2-), or Sr(2+) released from each experimental resin into water were measured. The standardized solutions of each ion were prepared at the concentrations determined to be released from the experimental resin, and their inhibitory effects of single ion species on S. mutans growth were evaluated by using each standardized solution.
  
  
  
  Resin composites containing S-PRG filler at 13.9 (vol.%) or greater inhibited S. mutans growth on their surface. When S. mutans was incubated in the presence of six kinds of ions at the concentrations released from the resin composite containing S-PRG filler at 55.9 (vol.%), a significant reduction in bacterial number was observed for BO3(3-), F(-), Al(3+), and SiO3(2-). Among these four ions, BO3(3-) and F(-) demonstrated the strongest inhibitory effect on S. mutans growth.
  
  
  
  Our findings suggest that resin composites containing S-PRG filler inhibit the growth of S. mutans on their surface. BO3(3-), F(-), Al(3+) and SiO3(2-) released from S-PRG filler have the ability to inhibit S. mutans growth, and the inhibitory effects are mainly attributed to release of BO3(3-) and F(-).
authors.affiliation: Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, Osaka, Japan.
authors.forename: Saeki
authors.initials: S
authors.lastname: Miki
authors.affiliation: Department of Biomaterials Science, Osaka University Graduate School of Dentistry, Osaka, Japan.
authors.forename: Haruaki
authors.initials: H
authors.lastname: Kitagawa
authors.affiliation: Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, Osaka, Japan.
authors.forename: Ranna
authors.initials: R
authors.lastname: Kitagawa
authors.affiliation: Department of Biomaterials Science, Osaka University Graduate School of Dentistry, Osaka, Japan.
authors.forename: Wakako
authors.initials: W
authors.lastname: Kiba
authors.affiliation: Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, Osaka, Japan.
authors.forename: Mikako
authors.initials: M
authors.lastname: Hayashi
authors.affiliation: Department of Biomaterials Science, Osaka University Graduate School of Dentistry, Osaka, Japan. Electronic address: imazato@dent.osaka-u.ac.jp.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Imazato
mesh_terms: D000900:Anti-Bacterial Agents; D003188:Composite Resins; D003764:Dental Materials; D003773:Dental Plaque / Q000382:microbiology*; D013295:Streptococcus mutans
chemical_list: D000900:Anti-Bacterial Agents; D003188:Composite Resins; D003764:Dental Materials
keywords: Antibacterial; Resin composite; S-PRG filler; Streptococcus mutans