Abstract

Abstract Aim: The aim of the present study was to compare apical transportation in curved root canals prepared using ProTaper Next, Wave One, TF, and OneShape nickel–titanium [NiTi] systems. Materials and methods: This study was conducted on mesiobuccal canals of extracted first and second mandibular molars with 30–60 degree curvatures [ n = 40]. Specimens were divided into four experimental groups [ n = 10 each]. In each group, the mesiobuccal canals were prepared using NiTi systems, including Wave One, ProTaper Next, TF, and OneShape. The apical transportation with each NiTi system was measured using a double digital radiograph technique. The data were analyzed by ANOVA using SPSS ver. 20.0, and significance was set at P Results: There were significant differences in apical transportation [ P P > 0.05] in apical transportation between TF and OneShape or between ProTaper Next and Wave One. Conclusions: TF and OneShape NiTi systems preserved the original shape of the canal in the apical area better than ProTaper Next and Wave One NiTi systems did.

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