Effectiveness of hand iles and the MTwo R system in bacterial reduction in endodontically treated teeth with chronic apical periodontitis

Marcos Sergio Endo Fernanda Graziela Corrêa Signoretti, Nair Narumi Orita Pavan Frederico Canato Martino, Brenda Paula Figueiredo de Almeida Gomes

Objective: The aim of this in vivo study was to compare the efficacy of two techniques used to remove gutta-percha: hand files and MTwo R system, assessing their efficacy to reduce microbial load after chemo-mechanical preparation of root-filled teeth with post-treatment apical periodontitis. Methods: Thirty single root-filled teeth with periapical lesion were divided into two groups. In one group (n = 15), gutta-percha was removed with hand files, whereas the other group (n = 15) was prepared with MTwo R files. After removing the gutta-percha, the first sample was obtained (S1). Subsequently, chemo-mechanical preparation was carried out and a second sample was collected (S2). Bacterial load was determined by means of culture techniques. Statistical analysis was performed by means of Wilcoxon and Mann-Whitney tests. Results: At S1, all canals were positive for bacteria in both hand file and MTwo R groups, with medians of 5.14 x 103 (range 20 1.7 x 105) and 3.4 x 102 (range 20 3.14 x 103), respectively. At S2, the bacterial load reduced in both groups (P < 0.05). Conclusion: MTwo R was significantly more effective in reducing intra-canal bacteria during endodontic retreatment.

Keywords: Endodontics. Retreatment. Microbiology

How to cite: Endo MS, Signoretti FGC, Pavan NNO, Martinho FC, Gomes BPFA. Effectiveness of hand iles and the MTwo R system in bacterial reduction in endodontically treated teeth with chronic apical periodontitis. Dental Press Endod. 2014 Sept-Dec;4(3):21-7. DOI: http://dx.doi.org/10.14436/2178-3713.4.3.021-027.oar

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