infl uence of motion pattern on apical transportation and centering ability of waveone single-fi le technique in curved root canals

background: the aim of this study was to evaluate apical transportation and centering ability of single-fi le instruments, waveone primary, with full rotation versus reciprocation movement using cone-beam computed tomography (cbct) analysis in curved mesiobuccal (mb) root canal of human mandibular molars. materials and methods: thirty mb canals of mandibular molars were randomly divided into two groups according to the instrument motion (n = 15): group 1, reciprocation/waveone primary; group 2, continuous rotation/waveone primary. after preparation, the amount of apical transportation and centering ability were assessed by evaluating pre- and post-instrumentation cbct scans in three section (1, 3, and 5 mm from apical foramen). statistical analysis of the data was performed using mann-whitney u-test and friedman test (α = 0.05). results: there was no statistically signifi cant difference between two experimental groups in terms of apical transportation and centering ratio at 1, 3, and 5 mm from apical foramen (p > 0.05). conclusion: apical transportation and centering ability of waveone primary reciprocating instrument did not signifi cantly differ between two motion patterns. key words: apical, cone-beam computed tomography, full, reciprocating, rotation, single, transportation