Comparative Analysis of Canal Centering and Transportation: Edgefile X7 vs HyFlex EDM in Moderately Curved Mesiobuccal Root Canals of Mandibular Molars

BACKGROUND This cone beam computed tomography (CBCT) endodontics study aimed to compare the canal-centering ability and canal transportation of Edgefile X7 and HyFlex EDM files in moderately curved mesiobuccal (MB) root canals of 30 mandibular first permanent molar teeth. MATERIAL AND METHODS Thirty permanent mandibular first molars with 10° and 24° of mesial root curvature were selected and scanned with CBCT. Two experimental groups of 15 each were made: group I: HyFlex EDM, and group II: Edgefile X7. The MB canals were instrumented, and CBCT scans were repeated. The distance from MB canal to the outer wall of the root was measured on pre- and post-instrumentation scans at 3 mm, 6 mm, and 9 mm from the apex. Canal transportation and centering ability were determined using established calculation methods. RESULTS For HyFlex EDM, average canal transportation was 0.01±0.17 mm, -0.10±0.21 mm, and 0.03±0.33 mm at 3 mm, 6 mm, and 9 mm, respectively; for Edgefile X7, average canal transportation was -0.02±0.21 mm, 0.07±0.22 mm, and -0.12±0.23 mm, respectively. HyFlex EDM group showed considerable canal transportation at 6 mm (P<0.05), while both groups showed non-significant differences at 3 mm and 9 mm. CONCLUSIONS At levels of 3 mm, 6 mm, and 9 mm, canal transportation was observed either on the mesial or distal surface of the canal curvature by HyFlex EDM and Edgefile X7 file systems. Compared with the HyFlex EDM file system, the Edgefile X7 file system showed reduced canal transportation and improved canal-centering ability.