Antibacterial properties and compressive strength of new one-step preparation silver nanoparticles in glass ionomer cements (NanoAg-GIC). (February 2018)

• Record Type: Journal Article
• Authors: Paiva, L.; Fidalgo, T.K.S.; da Costa, L.P.; Maia, L.C.; Balan, L.; Anselme, K.; Ploux, L.; Thiré, R.M.S.M.
• Is Part Of: Journal of dentistry. Volume 69(2018:Feb.)
• Page Start: 102
• Page End: 109
• Publication Date: 2018-02
• Subjects: Nanocomposite -- Silver nanoparticle -- Photoreduction synthesis -- Conventional glass ionomer cement -- Antibacterial material -- Compressive strength -- Net setting time; Dentistry -- Periodicals; Dentistry -- Periodicals; Dentisterie -- Périodiques; Electronic journals; 617.6005
• DOI: 10.1016/j.jdent.2017.12.003
• Languages: English
• ISSNs: 0300-5712

Abstract

Abstract: Objectives: This work aimed (1) to develop polyacid formulations by the one-step photoreduction of silver nanoparticles (AgNP) in a polyacrylate solution of conventional glass ionomer cement (GIC), imparting antibacterial activity; and (2) to evaluate handling and mechanical properties of experimental ionomers in comparison to a commercially available conventional GIC. Methods: Formulations with increasing sub-stoichiometric amounts of AgNO3 were monitored during continuous UV light exposure by UV–vis spectroscopy and analyzed by transmission electron microscopy. The resulted synthesis of formulations containing small and disperse spherical nanoparticles (∼6 nm) were used to design the experimental nano-silver glass ionomer cements (NanoAg-GIC). The cements were characterized as to net setting time and compressive strength according to ISO 9917-1:2007 specifications. The antibacterial activity of these cements was assessed by Ag + diffusion tests on nutritive agar plates ( E. coli ) and by MTT assay ( S. mutans). Results: The higher concentration of silver (0.50% by mass) in the matrix of NanoAg-GIC allowed viable net setting time and increased in 32% compressive strength of the experimental cement. All groups containing AgNP induced statistically significant E. coli growth inhibition zones ( p -value <.05), indicating diffusion of Ag + ions on the material surroundings. Metabolic activity of S. mutans grown on NanoAg-GIG with higher concentration of silver was significantly affected compared to control ( p -value <.01). Conclusions: Silver nanoparticles one-step preparation in polyacrylate solution allowed the production of highly bioactive water-based cements within suitable parameters for clinical use and with large potential of dental and biomedical application.