title: Shaping ability of reciprocating motion of WaveOne and HyFlex in moderate to severe curved canals: A comparative study with cone beam computed tomography.
abstract: BACKGROUND
  M-Wire and reciprocating motion of WaveOne and controlled memory (CM) wire) of HyFlex were the recent innovations using thermal treatment. Therefore, a study was planned to evaluate the shaping ability of reciprocating motion of WaveOne and HyFlex using cone beam computed tomography (CBCT).
  
  
  METHODS
  Forty-five freshly extracted mandibular teeth were selected and stored in saline until use. All teeth were scanned pre- and post-operatively using CBCT (Kodak 9000). All teeth were accessed and divided into three groups. (1) Group 1 (controln= 15): Instrumented with ProTaper. (2) Group 2 (n= 15): Instrumented with primary file (8%/25) WaveOne. (3) Group 3 (n= 15): Instrumented with (4%/25) HyFlex CM. Sections at 1, 3, and 5 mm were obtained from the pre- and post-operative scans. Measurement was done using CS3D software and Adobe Photoshop software. Apical transportation and degree of straightening were measured and statistically analyzed.
  
  
  RESULTS
  HyFlex showed lesser apical transportation when compared to other groups at 1 and 3 mm. WaveOne showed lesser degree of straightening when compared to other groups.
  
  
  CONCLUSIONS
  This present study concluded that all systems could be employed in routine endodontics whereas HyFlex and WaveOne could be employed in severely curved canals.
authors.affiliation: Department of Conservative Dentistry and Endodontics, GSL Dental College, Rajahmundry, Andhra Pradesh, India.
authors.forename: Gurram Samuel
authors.initials: GS
authors.lastname: Simpsy
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vishnu Dental College, Kovvada, Andhra Pradesh, India.
authors.forename: Girija S
authors.initials: GS
authors.lastname: Sajjan
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vishnu Dental College, Kovvada, Andhra Pradesh, India.
authors.forename: Padmaja
authors.initials: P
authors.lastname: Mudunuri
authors.affiliation: Department of Conservative Dentistry and Endodontics, GSL Dental College, Rajahmundry, Andhra Pradesh, India.
authors.forename: Jyothi
authors.initials: J
authors.lastname: Chittem
authors.affiliation: Department of Conservative Dentistry and Endodontics, GSL Dental College, Rajahmundry, Andhra Pradesh, India.
authors.forename: Nalam N V D
authors.initials: NN
authors.lastname: Prasanthi
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vishnu Dental College, Kovvada, Andhra Pradesh, India.
authors.forename: Pankaj
authors.initials: P
authors.lastname: Balaga
keywords: Apical transportation; HyFlex; M-Wire; WaveOne; centering ability; cone beam computed tomography; controlled memory wire; reciprocating motion