Comparative analysis of endodontic pathogens using checkerboard hybridization in relation to culture |
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Authors: | Vianna M E Horz H-P Conrads G Feres M Gomes B P F A |
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Institution: | Department of Restorative Dentistry, Endodontic Division, Piracicaba Dental School, State University of Campinas –UNICAMP, Piracicaba, SP, Brazil;, Department of Operative and Preventive Dentistry &Periodontology, and Department of Medical Microbiology, Division of Oral Microbiology and Immunology, RWTH Aachen University Hospital, Aachen, Germany;, Department of Periodontology, Dental Research Division, Guarulhos University, Sao Paulo, SP, Brazil |
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Abstract: | Background/Aim: The purpose of this study was to detect bacterial species and to quantify the total number of bacteria from samples of infected root canals before (S1) and after chemo-mechanical preparation using 2% chlorhexidine (CHX) gel as auxiliary chemical substance (S2) and after 7 days of intracanal dressing (S3) to compare microbial changes. Method: Twenty-four teeth were selected for this study. Chemo-mechanical preparation was performed using 2% CHX gel, then three different intracanal medicaments M1: Ca(OH)2 paste; M2: 2% CHX gel; and M3: Ca(OH)2 paste plus 2% CHX gel] were used for 7 days. Checkerboard DNA–DNA hybridization was performed to detect 40 bacterial species. Aerobic and anaerobic culture techniques were used to determine the bacterial community by counting the colony-forming units (CFU). Results: The species most frequently identified by checkerboard in S1 were: Fusobacterium nucleatum ssp . polymorphum , Treponema socranskii ssp. socranskii , Parvimonas micra and Enterococcus faecalis. In S2 and S3 a total of eight different species were identified; and only one of them was gram-positive ( E. faecalis ). Microorganisms were not identified after use of M2 for 7 days. The quantification obtained on agar plates ranged from 4 × 105 to 2.6 × 106 CFU/ml in S1, mean CFU was reduced by 99.96% in S2, and there was no statistical difference between the CFU in S2 and S3. Conclusion: The antibacterial effect of the mechanical preparation supplemented by the use of an antibacterial auxiliary substance greatly reduced the microorganisms in the main root canal. |
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Keywords: | bacteria calcium hydroxide checkerboard DNA–DNA hybridization chlorhexidine |
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