Background: The goal of root canal preparation is to develop a shape that tapers from apical to coronal, maintaining the original canal shape. Emergence of nickel‑titanium (NiTi) instruments, was a significant improvement in the quality of root canal shaping, with predictable results and less iatrogenic damage. Aim: The aim of the study was to evaluate the apical transportation of three NiTi file system in root canal using cone‑beam computed tomography (CBCT). Materials and Methods: Root canal of thirty extracted human permanent teeth with mature root apices with a of curvature 20°-40° were collected and divided into three groups after initial bio‑mechanical preparation: Group 1: canal prepared using Mani silk system; Group 2: canal prepared using V‑taper file system and Group 3: canal prepared using ProTaperNext (PTN) file system. All samples were scanned before and after biomechanical preparation using CBCT. The data collected were evaluated using the Kruskal–Wallis analysis of variance test and Mann-Whitney U‑test. Results: It was observed that in apical region Group 3 (PTN) showed significantly lower mean apical transportation ability as compared to Group 1 (Mani Silk) and Group 2 (V‑taper). Conclusion: It was concluded that PTN rotary system has no canal transportation in comparison to Mani and V‑taper rotary file system in apical region of curved root canal.
Keywords: Apical transportation, cone‑beam computed tomography, rotary instruments
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