Abstract
Introduction This study is aimed at evaluating root canal transportation in the mesiobuccal canal of mandibular first molars prepared with One Shape, Reciproc, and M-One nickel titanium (NiTi) single-file rotary systems using cone beam computed tomography (CBCT). Materials and Methods In this ex vivo study, CBCT scans of 45 extracted human mandibular first molars with 20–40° curvature were obtained. The teeth were randomly divided into three groups (n=15) for preparation of the mesiobuccal canal with One Shape, Reciproc, and M-One rotary systems according to the manufacturers' instructions. CBCT scans were obtained again after canal preparation. Changes caused by preparation in the coronal, middle, and apical thirds were determined on CBCT scans and analyzed using the Kruskal–Wallis test at P ≤ 0.05 level of significance. Results No significant difference was noted in the amount of canal transportation among the three groups (P > 0.05). M-One caused greater transportation in the apical third compared with Reciproc and One Shape, and One Shape caused greater transportation in the coronal third compared with other groups, although its magnitude was less than 0.3 mm. Conclusion Reciproc, One Shape, and M-One are not significantly different in terms of canal transportation.
Highlights
Several nickel titanium (NiTi) instruments capable of faster and more efficient root canal preparation were introduced in the market. ese systems have differences in some features such as cleaning efficacy, stress applied to dentinal walls, and ability to prepare ovalshaped root canals [7]
No previous study has compared canal transportation caused by three NiTi single-file systems, namely, One Shape and M-One with continuous rotational movement and Reciproc with reciprocal movement. us, this study aimed at comparing canal transportation in the mesiobuccal canal of mandibular first molars prepared with One Shape, Reciproc, and M-One NiTi single-file rotary systems using cone beam computed tomography (CBCT)
M-One caused greater transportation in the apical third compared with Reciproc and One Shape, and One Shape caused greater transportation in the coronal third compared with the other groups, its magnitude was less than 0.3 mm
Summary
A previous study showed that WaveOne with reciprocating motion caused less canal transport than One Shape and ProTaper files [12]. Another study showed that Reciproc and WaveOne instruments caused significantly less canal transport than One Shape [13], while Cimilli and Kartal [14] indicated that continuous rotation had higher centering ability than reciprocating motion.
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