Antibacterial Activity of Chlorhexidine Bigluconate in Relation to Biofilm Monocultures

On the background of a high percentage of caries incidence, the prevalence of its complications is increasing – pulpitis, apical periodontitis. Teeth with complicated caries can cause odontogenic inflammatory processes in the maxillofacial region. Being foci of chronic infection and intoxication, they have an adverse effect on the body as a whole. In connection with the above, it is obvious that determining the optimal concentration of chlorhexidine bigluconate and exposure to the dentin of the crown part of the tooth in case of carious lesion of the latter is currently very important. The purpose of the study was to evaluate the antimicrobial activity of chlorhexidine (by suspension and contact method) in various concentrations in relation to monocultures of biofilm formed on tooth sections and in U-shaped 96-well plastic plates. Material and methods. In this work, one of the most relevant pathogens for modern medicine was Staphylococcus aureus, which was one of the most powerful pathogens that form biofilms, was used as a model. The antimicrobial activity of chlorhexidine bigluconate was evaluated on S. aureus and E. coli biofilm cultures formed on dental samples and in polystyrene plastic tablets. Antimicrobial activity was evaluated by the reduction factor was determined by the difference in the number of decimal logarithms of CFU/ml in the experiment compared to the control. The obtained data was subjected to statistical processing. Results and discussion. The study revealed that 2.0 % solution of chlorhexidine bigluconate had a high level of antibacterial activity against tablet biofilm cultures of S. aureus and E. coli. When it was exposed to S. aureus and E. coli tablet biofilm cultures with exposures of 30 and 60 seconds, statistically significant differences were found (p=0.02). Secondly, statistically significant differences in the effect of sensitivity of single-species biofilm cultures of dental samples to the effect of antiseptic at the specified concentration were determined (p=0.007). At the same time, the level of antibacterial activity of 2.0 % chlorhexidine bigluconate solution in respect of tablet biofilm cultures of S. aureus and E. coli was significantly higher than in biofilm cultures of S. aureus and E. coli of dental samples (p