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Effectiveness of Chemomechanical Preparation with Alternating Use of Sodium Hypochlorite and EDTA in Eliminating Intracanal Enterococcus faecalis Biofilm

2010; Elsevier BV; Volume: 36; Issue: 5 Linguagem: Inglês

10.1016/j.joen.2010.01.002

1878-3554

Janir Alves Soares, Maria Auxiliadora Roque de Carvalho, Suelleng Maria Cunha Santos, Rafael Mangerotti Castro Mendonça, Antônio Paulino Ribeiro Sobrinho, Manoel Brito-Júnior, Paula Prazeres Magalhães, Maria Helena Santos, Luiz de Mácêdo Farias,

Dental Radiography and Imaging

Introduction The elimination of microorganisms from root canals is a critical step in endodontic treatment. We aimed to evaluate the antimicrobial effectiveness of an alternating irrigation regimen during chemomechanical preparation (CMP). Methods During 21 days, root canals of extracted human teeth were infected with Enterococcus faecalis, and colonization was confirmed by scanning electron microscopy (SEM). Canals were irrigated with saline solution (control group), with 5.25% NaOCl followed by a final rinse with 17% EDTA (conventional irrigation group), or with the alternating use of NaOCl and EDTA (alternating irrigation [AI] group). Samples were taken before treatment (S1), after CMP (S2), and during the following 14 days. Two specimens/group were analyzed by SEM. Results The AI group yielded negative agar and liquid cultures from immediately after CMP and from the 5th day on, respectively. SEM confirmed several bacterium-free sites in the AI group. Conclusion The irrigation regimen based on the alternating use of NaOCl and EDTA seems to be a promising endodontic tool because it promoted the elimination of root canal E. faecalis biofilms throughout the experimental period.