الفهرس 
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Abstract
A child’s primary teeth are one of his or her most important possessions. Mastication, phonetics, aesthetics, and social acceptability all rely on them. A paediatric dentist has had a difficult time preserving primary teeth with non-vital pulp. Pulpectomy is required when the pulp becomes permanently diseased or necrotic as a result of caries, trauma, or other factors.
In paediatric dentistry, antibacterial effectiveness is one of the most important factors for a good obturation material. Antimicrobial components in pulpectomy materials may become a critical element in avoiding the re-growth of leftover germs and regulating bacterial entrance into the root canal system of primary teeth, helping to avoid pulp treatment failure.
The purpose of this study was to evaluate the antibacterial potential of three obturation materials for primary teeth: zinc oxide eugenol (ZOE), calcium hydroxide with iodoform (Metapex), and a combination of zinc oxide eugenol, calcium hydroxide, and iodoform (Endoflas) against two bacteria strains: Enterococcus faecalis and Bacteroid fragilis.
Standard bacterial strains of E. faecalis and B. fragilis were obtained from the microbiology department of El-Azhar University in Cairo for the in vitro experiment. By measuring the inhibition zone surrounding each tested obturating material in 18 petri dishes, the antibacterial effectiveness of the investigated obturation materials against both kinds of bacteria was examined using the agar diffusion method (divided into 6 for each material and 3 for each type of selected bacteria) which (divided into 3 groups), group 1 for ZOE, group 2 for Endoflas, group 3 for Metapex, then aerobically incubated at 37°C. Antibacterial efficacy assessment was done at 24 hours intervals in terms of mean zones of inhibition.