title: Micro-Computed Tomography Evaluation of ProTaper Next and BioRace Shaping Outcomes in Maxillary First Molar Curved Canals.
abstract: BACKGROUND
  The aim of this micro-computed tomography study was to describe the shaping properties of ProGlider/ProTaper Next (PG/PTN) and ScoutRace/BioRace (SR/BR) nickel-titanium rotary systems.
  
  
  METHODS
  Thirty maxillary first permanent molars were selected. Mesiobuccal canals were randomly assigned (n = 15) to PG/PTN or SR/BR groups. Irrigation was performed with 5% NaOCl and 10% EDTA. Specimens were scanned (voxel size, 9.1 μm) for matching volumes and surface areas and post-treatment analyses. Root canal centering ability, canal geometry enlargement, and thickness of dentinal wall at inner curvature were assessed at apical level and point of maximum curvature. Results were analyzed with 4 one-way analyses of variance.
  
  
  RESULTS
  Canal centering ability was superior in PG/PTN (P = .006 at apical level, P = .025 at point of maximum curvature). PG/PTN demonstrated a more conservative increase of canal areas (P = .027 at apical level, P = .038 at point of maximum curvature). Centrifugal increase in canal diameters did not significantly differ between groups (P = .65 at apical level, P = .61 at point of maximum curvature). Inner dentinal wall thickness was less reduced with PG/PTN compared with SR/BR, with no statistical differences (P = .23 at point of maximum curvature, P = .89 at apical level). PG/PTN shaping taper ranged between 6% and 7%.
  
  
  CONCLUSIONS
  Neither system produced significant shaping errors in curved canals. PG/PTN system showed better preservation of canal anatomy. PTN offset section did not influence final preparation taper.
authors: Department of Surgical Sciences, Dental School, Endodontics, University of Turin, Turin, Italy. Electronic address: damiano.pasqualini@unito.it.
authors: Damiano
authors: D
authors: Pasqualini
authors: Department of Surgical Sciences, Dental School, Endodontics, University of Turin, Turin, Italy.
authors: Mario
authors: M
authors: Alovisi
authors: Department of Radiodiagnostics, University of Turin, Turin, Italy.
authors: Andrea
authors: A
authors: Cemenasco
authors: Elettra Sincrotrone Trieste S.C.p.A, Trieste, Italy.
authors: Lucia
authors: L
authors: Mancini
authors: Department of Mechanical Engineering and Aerospace, Politecnico di Torino, Turin, Italy.
authors: Davide Salvatore
authors: DS
authors: Paolino
authors: Department of Radiodiagnostics, University of Turin, Turin, Italy.
authors: Caterina Chiara
authors: CC
authors: Bianchi
authors: Department of Surgical Sciences, Dental School, Endodontics, University of Turin, Turin, Italy.
authors: Andrea
authors: A
authors: Roggia
authors: Department of Surgical Sciences, Dental School, Endodontics, University of Turin, Turin, Italy.
authors: Nicola
authors: N
authors: Scotti
authors: Department of Surgical Sciences, Dental School, Endodontics, University of Turin, Turin, Italy.
authors: Elio
authors: E
authors: Berutti
mesh_terms: D003722:Dental Alloys; D003786:Dental Pulp Cavity / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D006801:Humans; D008437:Maxilla; D008963:Molar / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D014025:Titanium; D055114:X-Ray Microtomography
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium
keywords: BioRace; NiTi rotary instrument; ProTaper Next; canal shaping; canal transportation; micro-CT