title: Wizard CD Plus and ProTaper Universal: analysis of apical transportation using new software.
abstract: OBJECTIVE
  This study has two aims: 1) to evaluate the apical transportation of the Wizard CD Plus and ProTaper Universal after preparation of simulated root canals; 2) to compare, with Adobe Photoshop, the ability of a new software (Regeemy) in superposing and subtracting images.
  
  
  METHODS
  Twenty five simulated root canals in acrylic-resin blocks (with 20º curvature) underwent cone beam computed tomography before and after preparation with the rotary systems (70 kVp, 4 mA, 10 s and with the 8×8 cm FoV selection). Canals were prepared up to F2 (ProTaper) and 24.04 (Wizard CD Plus) instruments and the working length was established to 15 mm. The tomographic images were imported into iCAT Vision software and CorelDraw for standardization. The superposition of pre- and post-instrumentation images from both systems was performed using Regeemy and Adobe Photoshop. The apical transportation was measured in millimetres using Image J. Five acrylic resin blocks were used to validate the superposition achieved by the software. Student's t-test for independent samples was used to evaluate the apical transportation achieved by the rotary systems using each software individually. Student's t-test for paired samples was used to compare the ability of each software in superposing and subtracting images from one rotary system per time.
  
  
  RESULTS
  The values obtained with Regeemy and Adobe Photoshop were similar to rotary systems (P>0.05). ProTaper Universal and Wizard CD Plus promoted similar apical transportation regardless of the software used for image's superposition and subtraction (P>0.05).
  
  
  CONCLUSIONS
  Wizard CD Plus and ProTaper Universal promoted little apical transportation. Regeemy consists in a feasible software to superpose and subtract images and appears to be an alternative to Adobe Photoshop.
authors.affiliation: Department of Endodontics, Pontifical Catholic University of Rio Grande do Sul, Porto AlegreRS, Brazil.
authors.forename: Daiana
authors.initials: D
authors.lastname: Giannastasio
authors.forename: Ricardo Abreu da
authors.initials: RA
authors.lastname: Rosa
authors.forename: Bernardo Urbanetto
authors.initials: BU
authors.lastname: Peres
authors.forename: Mirela Sangoi
authors.initials: MS
authors.lastname: Barreto
authors.forename: Gustavo Nogara
authors.initials: GN
authors.lastname: Dotto
authors.forename: Milton Carlos
authors.initials: MC
authors.lastname: Kuga
authors.forename: Jefferson Ricardo
authors.initials: JR
authors.lastname: Pereira
authors.forename: Marcus Vinícius Reis
authors.initials: MV
authors.lastname: Só
mesh_terms: D054893:Cone-Beam Computed Tomography; D003762:Dental Instruments; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008953:Models, Anatomic; D012016:Reference Values; D015203:Reproducibility of Results; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D012984:Software; D018709:Statistics, Nonparametric; D013997:Time Factors