Sahar Rostamifar1, Azita Azad2, Ali Bazrafkan1, Farzan Modaresi3, Shekoufeh Atashpour4, Zahra Kargar Jahromi5. 1. Student Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. 2. Oral and Dental Disease Research Center, Department of Oral & Maxillofacial Medicine, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. 3. Departments of Microbiology, Advanced Medical Sciences and Technology, and Central Laboratory Research, Jahrom University of Medical Sciences, Jahrom, Iran. 4. Departments of Pharmacology, Advanced Medical Sciences and Technology, and Central Laboratory Research, Jahrom University of Medical Sciences, Jahrom, Iran. 5. Central Research Laboratory, Jahrom University of Medical Sciences, Jahrom, Iran.
Abstract
OBJECTIVE: Enterococcus faecalis and Streptococcus salivarius are the most important species in dental decay and producing biofilm. Treatment with chlorhexidine 2% mouthwash for 7 days is the best way to eliminate these bacteria. However, due to the ability of these bacteria to survive in harsh environments, increasing emergence of bacterial resistance against available antibiotics, and favorable properties of nanoparticles including broad spectrum antimicrobial activity and lower toxicity, we decided to evaluate reducing biofilm forming bacteria in oral cavity by bismuth nanoparticles. MATERIALS AND METHODS: This was a cross-sectional study of 40 samples isolated from the patients visiting dental clinics in Shiraz in 2019. Samples, which showed growth, were cultured on blood agar plates and incubated for the PCR procedure. Nanoparticle powder was dissolved in high-purity water, and the final concentration of bismuth nanoparticles (BiNPs) was measured with a spectrophotometer. Minimum inhibitory concentration (MIC) of BiNPs against E. faecalis and S. salivarius was determined by the microbroth dilution method according to methods for antimicrobial susceptibility tests. Also, bactericidal assays were conducted in a Mueller-Hinton broth medium and reported as the concentration of BiNPs that reduced the viable bacterial count by 99.9%. Statistical analysis was carried out using SPSS 21 and one-way analysis of variance, and P values less than 0.05 were considered significant. RESULTS: MICs of BiNP suspension against Streptococcus salivarius and Enterococcus faecalis were 2.5 and 5 μg/ml, respectively. Minimum bactericidal concentrations (MBC) of BiNP suspension against Streptococcus salivarius and Enterococcus faecalis were 5 and 10 μg/ml, respectively. Antibacterial activity of BiNPs was compared with chlorhexidine 2%. MICs of BiNPs against Streptococcus salivarius and Enterococcus faecalis were one-twentieth less than those of chlorhexidine. MBC of BiNPs against both pathogens was one-tenth less than those of chlorhexidine. CONCLUSION: BiNPs were more effective than chlorhexidine, and MIC and MBC of bismuth nanoparticles are lower than those of chlorhexidine.
OBJECTIVE: Enterococcus faecalis and Streptococcus salivarius are the most important species in dental decay and producing biofilm. Treatment with chlorhexidine 2% mouthwash for 7 days is the best way to eliminate these bacteria. However, due to the ability of these bacteria to survive in harsh environments, increasing emergence of bacterial resistance against available antibiotics, and favorable properties of nanoparticles including broad spectrum antimicrobial activity and lower toxicity, we decided to evaluate reducing biofilm forming bacteria in oral cavity by bismuth nanoparticles. MATERIALS AND METHODS: This was a cross-sectional study of 40 samples isolated from the patients visiting dental clinics in Shiraz in 2019. Samples, which showed growth, were cultured on blood agar plates and incubated for the PCR procedure. Nanoparticle powder was dissolved in high-purity water, and the final concentration of bismuth nanoparticles (BiNPs) was measured with a spectrophotometer. Minimum inhibitory concentration (MIC) of BiNPs against E. faecalis and S. salivarius was determined by the microbroth dilution method according to methods for antimicrobial susceptibility tests. Also, bactericidal assays were conducted in a Mueller-Hinton broth medium and reported as the concentration of BiNPs that reduced the viable bacterial count by 99.9%. Statistical analysis was carried out using SPSS 21 and one-way analysis of variance, and P values less than 0.05 were considered significant. RESULTS: MICs of BiNP suspension against Streptococcus salivarius and Enterococcus faecalis were 2.5 and 5 μg/ml, respectively. Minimum bactericidal concentrations (MBC) of BiNP suspension against Streptococcus salivarius and Enterococcus faecalis were 5 and 10 μg/ml, respectively. Antibacterial activity of BiNPs was compared with chlorhexidine 2%. MICs of BiNPs against Streptococcus salivarius and Enterococcus faecalis were one-twentieth less than those of chlorhexidine. MBC of BiNPs against both pathogens was one-tenth less than those of chlorhexidine. CONCLUSION: BiNPs were more effective than chlorhexidine, and MIC and MBC of bismuth nanoparticles are lower than those of chlorhexidine.
Authors: Brenda P F A Gomes; Ericka T Pinheiro; Rogério C Jacinto; Alexandre A Zaia; Caio C R Ferraz; Francisco J Souza-Filho Journal: J Endod Date: 2008-03-04 Impact factor: 4.171
Authors: Rene Hernandez-Delgadillo; Donaji Velasco-Arias; David Diaz; Katiushka Arevalo-Niño; Marianela Garza-Enriquez; Myriam A De la Garza-Ramos; Claudio Cabral-Romero Journal: Int J Nanomedicine Date: 2012-04-24
Authors: Rene Hernandez-Delgadillo; Donaji Velasco-Arias; Juan Jose Martinez-Sanmiguel; David Diaz; Inti Zumeta-Dube; Katiushka Arevalo-Niño; Claudio Cabral-Romero Journal: Int J Nanomedicine Date: 2013-04-24