title: Influence of motion pattern on apical transportation and centering ability of WaveOne single-file technique in curved root canals.
abstract: BACKGROUND
  The aim of this study was to evaluate apical transportation and centering ability of single-file 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.
  
  
  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 significant 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).
  
  
  CONCLUSIONS
  Apical transportation and centering ability of WaveOne primary reciprocating instrument did not significantly differ between two motion patterns.
authors.affiliation: Department of Endodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Mandana
authors.initials: M
authors.lastname: Naseri
authors.affiliation: Department of Endodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Payam
authors.initials: P
authors.lastname: Paymanpour
authors.affiliation: Department of Endodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Kangarloo
authors.affiliation: Department of Orthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Sahar
authors.initials: S
authors.lastname: Haddadpur
authors.affiliation: Department of Endodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Omid
authors.initials: O
authors.lastname: Dianat
authors.affiliation: Department of Endodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Ketabi
keywords: Apical; cone-beam computed tomography; full; reciprocating; rotation; single; transportation