background: metal nanoparticles have been recently applied in dentistry because of their antibacterial properties. this study aimed to evaluate antibacterial effects of colloidal solutions containing zinc oxide (zno), copper oxide (cuo), titanium dioxide (tio2) and silver (ag) nanoparticles on streptococcus mutans and streptococcus sangius and compare the results with those of chlorhexidine and...

OBJECTIVES The aim of the present study was to analyze the efficacy of Papacarie(®) gel compared with the traditional method (low-speed bur) in reducing the counts of total bacteria, Lactobacillus, total Streptococcus and Streptococcus mutans group. METHODS A randomized, controlled clinical trial with a split-mouth design was performed. The sample comprised 40 deciduous teeth in 20 children (...

1. Hamada, S. and Slade, H. D. (1980): Biology, immunology and carinogenisity of Streptococcus mutans. Microbiol. Rev., 44, 331-384. 2. Okahashi, N., Sasakawa, C., Yoshikawa, M., Hamada, M. and Koga, T. (1989): Cloning of a surface protein antigen gene from serotype c StylePtOCOCCuS mutanS. Mol. Microbio1., 3, 221228. 3. Hanada, N. and Kuramitsu, H. K. (1989): isolation and characterization of ...

The glucosyltransferases of Streptococcus mutans are recognized as important virulence factors for this cariogenic bacterium. To study the expression of the gtfB gene of S. mutans in biofilms, a gtfB promoter (PgtfB)-green fluorescent protein (GFP) reporter system was developed. A Streptococcus-Escherichia coli shuttle vector harbouring a PGTFB::gfp cassette was introduced into S. mutans GS-5, ...

honey has antibacterial activity. the aim of this study was to evaluate the antibacterial activity of honey on streptococcus mutans and lactobacillus.in this in vitro study, solutions containing 0%, 5%, 10%, 20%, 50% and 100%(w/v) of natural hamadan honey were prepared. each blood (nutrient) agar plate was then filled with dilutions of the honey. the strains of bacteria were inoculated in blood...

Transposon mutagenesis coupled with next-generation DNA sequencing (Tn-seq) is a powerful tool for discovering regions of the genome that are required for the survival of bacteria in different environments. We adapted this technique to the dental caries pathogen Streptococcus mutans UA159 and identified 11% of the genome as essential, with many genes encoding products required for replication, ...