Evaluation of the Microbiological Effect of Colloidal Nanosilver Solution for Root Canal Treatment

Svetlana Razumova; Anzhela Brago; Haydar Barakat; Ammar Howijieh; Alexander Senyagin; Dimitriy Serebrov; Zoya Guryeva; Yuliya Kozlova; Elvira Adzhieva

doi:10.3390/jfb13040163

Evaluation of the Microbiological Effect of Colloidal Nanosilver Solution for Root Canal Treatment

J Funct Biomater. 2022 Sep 25;13(4):163. doi: 10.3390/jfb13040163.

Authors

Svetlana Razumova¹, Anzhela Brago¹, Haydar Barakat¹, Ammar Howijieh¹, Alexander Senyagin², Dimitriy Serebrov¹, Zoya Guryeva¹, Yuliya Kozlova¹, Elvira Adzhieva¹

Affiliations

¹ Department of Propedeutics of Dental Diseases, Medical Institute, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia.
² Department of Microbiology and Virology, Medical Institute, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia.

Abstract

Background: The goal of endodontic treatment, along with the preparation of the root canal and giving it a shape corresponding to the obturation technique, is the drug treatment of the canal. The aim of this study was to determine the antibacterial effect of a colloidal solution of nanosilver at its various dilutions on root canal microorganism.

Materials and methods: A solution of silver nanoparticles at a concentration of 10,000 ppm (1.0%) was diluted in various concentrations (10 solutions from 1% to 0.0025%). Cultures used for research: Str. agalacticae ATCC 3984, E. faecalis ATCC 323, St. aureus ATCC 4785, C. albicans ATCC 10231. After thawing, cultures of microorganisms were introduced into a liquid nutrient medium: cerebral heart broth for bacterial cultures and Sabouraud broth for C. albicans. The cultivation was carried out at a temperature of 37 °C for 24 h. A bacterial suspension for inoculation was prepared from a microbial sediment according to a turbidity standard of 0.5 McFarland in saline. Then, 100 μL of the obtained suspension of microorganisms was inoculated by the "lawn" method using a spatula on the Muller-Hinton medium. Solutions of silver nanoparticles were introduced into wells prepared in agar with a sterile metal punch. Further incubation was carried out for 24 h at 37 °C.

Results: colloidal solution of silver nanoparticles at concentrations of 1%, 0.75%, 0.5% inhibited the growth of Str. agalacticae ATCC 3984 with a growth retardation zone of 6-7 mm. The E. faecalis ATCC 29212 strain was sensitive to solutions of silver nanoparticles at concentrations of 1%, 0.75%, 0.5% with a growth inhibition zone of 6-7 mm. Strain St. aureus 4785 demonstrated sensitivity to solutions of silver nanoparticles at concentrations of 1%, 0.75%, 0.5%, 0.1%, 0.05% with a growth retardation zone of 6-8 mm.

Conclusion: colloidal solutions of silver nanoparticles have antimicrobial action against gram-positive bacteria (Str.agalacticae ATCC 3984, St. aureus ATCC 4785, E. faecalis ATCC 29212) and yeast-like fungi of the genus Candida (C. albicans ATCC 10231, C. albicans 672 and C. albicans D-225M), but this action is strain-specific and depends on the concentration of the solution.

Keywords: antibacterial effect; bacteria; microorganisms; nanosilver.

Grants and funding

This research received no external funding. This paper has been supported by the RUDN University Strategic Academic Leadership Program.