Objectives This study aims to formulate a new Origanum vulgare anti-caries dental gel with high antimicrobial activity. Methods O. vulgare essential oil was extracted using hydro-distillation, ethanol extraction, gas chromatography/mass spectrometry, and high-performance liquid chromatography methods. Antimicrobial activity of the produced gels with oregano oil and extract was determined through the disco-diffusion method. The effectiveness of O. vulgare essential oil was tested in vitro for Streptococcus mutans biofilm using colorimetric analysis. Results O. vulgare essential oil inhibited the growth of S. mutans biofilm by 98% compared with unexposed control bacteria ( p <0.05 ). Five samples of anti-caries gel (ACDG1, ACDG2, ACDG3, ACDG4, ACDG5) were formulated using the obtained oregano essential oil and extract. Based on the microbiological study results, the ACDG1 and ACDG3 gel samples exhibited high antimicrobial activity against the gram-positive bacterial strains of Staphylococcus aureus and Bacillus subtilis and the yeast fungus Candida albicans and moderate antimicrobial activity against the gram-negative strains of Escherichia coli and Pseudomonas aeruginosa . Conclusion Based on the results of this study, the ACDG3 sample may be considered an anti-caries gel owing to its high antimicrobial activity. This sample has good organoleptic properties compared to other samples, produces relatively high antimicrobial activity, and guards against cariogenic biofilms of S. mutans.

The accumulation of biofilm by Streptococcus mutans bacteria on dental hard tissues leads to dental caries which remains one of the most common oral diseases. Therefore, the development of new antibacterial agents is critical. The aim of the study was to analyze the component composition of essential oils for 4 species of common Kazakh plants (Hyssopus ambiguus (Trautv.) Iljin., Nepeta cataria L., Origanum vulgare L., Ziziphora clinopodioides Lam) and study their effect on the formation of biofilms of Streptococcus mutans. After hydrodistillation, the chemical composition of essential oils was analyzed using gas chromatography in conjunction with mass spectrometry. The amount of biofilm formed by the bacteria Streptococcus mutans was assessed using the colorimetric method and optical profilometry. Results. Using GC-MS analysis, the chemical composition of 4 plant species of the Lamiaceae family was established. 1.8-cineole is the main ingredient for the essential oils of Hyssopus ambiguus and Nepeta cataria, carvacrol for Origanum vulgare, pullegon for Ziziphora clinopodioides, and nepetolactone for Nepeta cataria. As a result of the experiment Origanum vulgare and Nepeta cataria essential oils demonstrated the highest suppressive effect on S. mutans biofilm formation in the medium containing 1% sucrose. Conclusion. The results of the research can be used to develop new therapeutic and prophylactic dental products.

No abstract