• E J N L Silva, P T Pacheco, F Pires, F G Belladonna, and G De-Deus.
• Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Duque de Caxias, RJ, Brazil.
• Int Endod J. 2017 Jul 1; 50 (7): 694-699.

AimTo evaluate canal transportation and centring ability of ProTaper Next (PTN) and Twisted File Adaptive (TFA) systems using microcomputed tomographic (micro-CT) imaging.MethodologyTwenty isthmus-containing mesial roots of mandibular molars were anatomically matched based on similar morphological dimensions using micro-CT evaluation (resolution of 14.25 μm) and assigned to two experimental groups (n = 10) according to the system used for root canal preparation: PTN and TFA groups. Then, the specimens were scanned again and the matched images of the mesial canals, before and after preparation, were examined at three cross-section levels (3, 5 and 7 mm from the apical end of the root) to analyse canal transportation and centring ratio. Independent-samples t-test was used to compare canal transportation and centring ratio between the groups. All statistical procedures were performed with a significance level set at 5%.ResultsRoot canals prepared with either PTN or TFA systems had similar canal transportation and centring ratios at all levels (P > 0.05).ConclusionPTN and TFA had similar results regarding canal transportation and centring ability.© 2016 International Endodontic Journal. Published by John Wiley & Sons Ltd.

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