Comparison of root canal apical transportation associated with Wave One, ProTaper Next, TF, and OneShape nickel-titanium instruments in curved canals of extracted teeth: A radiographic evaluation

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 < 0.05. Results: There were significant differences in apical transportation [P < 0.05] among Wave One, ProTaper Next, TF, and OneShape NiTi systems. Apical transportation with Wave One was greater than that with OneShape, and transportation with ProTaper Next was greater than that with OneShape and TF. There was no significant difference [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.