V04N03 | 2014 | Original Article | Pages 21 to 27
Marcos Sergio Endo Fernanda Graziela Corrêa Signoretti, Nair Narumi Orita Pavan Frederico Canato Martino, Brenda Paula Figueiredo de Almeida Gomes
Endodontics, Retreatment, Microbiology
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.
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: //dx.doi.org/10.14436/2178-3713.4.3.021-027.oar