title: Antibacterial effects of 4-META/MMA-TBB resin containing chlorhexidine.
abstract: This study evaluated the antibacterial effects of 4-acryloyloxyethyl trimellitate anhydride/methyl methacrylate-tri-n-butylborane (4-META/MMA-TBB) resin containing chlorhexidine (CHX) digluconate. The CHX was incorporated into the resins at varying concentrations from 0.0 (control) to 3.0%. The antibacterial effect of each resin against seven microorganisms was examined using agar diffusion tests. Growth inhibition of two streptococci was also tested in brain heart infusion (BHI) liquid broth containing each resin. Release of CHX was analyzed using HPLC, and enamel and dentin bond strengths of each resin were measured. In the agar diffusion tests, growth of all the microorganisms was inhibited by the resin specimens containing CHX at 1.0% or higher except for Enterococcus faecalis. There was greater sensitivity in Streptococcus mutans and Streptococcus sobrinus than in the other bacteria tested. Complete growth inhibition of these two streptococci was observed in BHI liquid broth containing 1.0-1.5% or greater CHX-incorporated resin. According to HPLC analysis, 1.0% and 1.5% CHX-containing resins released means of 3.63 and 8.59 microg/mL of CHX, respectively. Specimens with 0.5-1.5% and 0.5-2.0% CHX exhibited no significant reduction in enamel and dentin bond strengths, respectively, when compared to the control (p > 0.05). This in vitro study suggested that incorporation of 1.0-1.5% CHX digluconate into the 4-META resin is optimal in terms of antibacterial effects and bond strength to the tooth.
authors.affiliation: Department of Dental Biomaterials, School of Dentistry, Kyungpook National University, Jung-gu, Daegu 700-412, Korea.
authors.forename: Tae-Yub
authors.initials: TY
authors.lastname: Kwon
authors.forename: Su-Hyung
authors.initials: SH
authors.lastname: Hong
authors.forename: Young Kyung
authors.initials: YK
authors.lastname: Kim
authors.forename: Kyo-Han
authors.initials: KH
authors.lastname: Kim
mesh_terms: D000362:Agar; D000900:Anti-Bacterial Agents; D001896:Boron Compounds / Q000737:chemistry*; D002710:Chlorhexidine / Q000737:chemistry* / Q000494:pharmacology*; D003188:Composite Resins / Q000737:chemistry* / Q000494:pharmacology*; D003470:Culture Media; D003743:Dental Enamel / Q000737:chemistry; D003804:Dentin / Q000737:chemistry; D004058:Diffusion; D004202:Disinfectants / Q000737:chemistry* / Q000494:pharmacology*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008768:Methylmethacrylates / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D013295:Streptococcus mutans / Q000187:drug effects / Q000254:growth & development; D016986:Streptococcus sobrinus / Q000187:drug effects / Q000254:growth & development; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: D000900:Anti-Bacterial Agents; D001896:Boron Compounds; D003188:Composite Resins; D003470:Culture Media; D004202:Disinfectants; D008689:Methacrylates; D008768:Methylmethacrylates; D000362:Agar; C049495:Super-bond; D002710:Chlorhexidine