Efficiency of photodynamic inactivation Actinomyces israelii and Prevotella melaninogenica

The goal of our work was to develop a composition for antimicrobial photodynamic inactivation (aPDI) of anaerobic periodontopathogenic pathogens. The three test groups were as follows: light plus doxycycline (L+DOX+), light plus doxycycline and hypericin (L + DOX + HYP +), and control groups. aPDI was evaluated by the number of grown colonies on a dense nutrient medium after 12, 24, and 48 hours of bacterial suspension cultivation. Based on the results of microbiological studies, the combined photosensitising effect of a subinhibitory dose of doxycycline and hypericin was determined. The delay of growth of A. israelii, P. melaninogenica in the second group (L+DOX+HYP) was significantly significant compared to the first group (L+DOX+), and the statistical difference in colony formation activity was found for both gram-positive and gram-negative cultures (p