title: Canal shaping with WaveOne Primary reciprocating files and ProTaper system: a comparative study.
abstract: BACKGROUND
  This study compared the canal curvature and axis modification after instrumentation with WaveOne Primary reciprocating files (Dentsply Maillefer, Ballaigues, Switzerland) and nickel-titanium (NiTi) rotary ProTaper (Dentsply Maillefer).
  
  
  METHODS
  Thirty ISO 15, 0.02 taper, Endo Training Blocks (Dentsply Maillefer) were used. In all specimens, the glide path was achieved with PathFile 1, 2, and 3 (Dentsply Maillefer) at the working length (WL). Specimens were then assigned to 1 of 2 groups for shaping: specimens in group 1 were shaped with ProTaper S1-S2-F1-F2 at the WL and specimens in group 2 were shaped with WaveOne Primary reciprocating files at the WL. Pre- and postinstrumentation digital images were superimposed and processed with Matlab r2010b (The MathWorks Inc, Natick, MA) software to analyze the curvature-radius ratio (CRr) and the relative axis error (rAe), representing canal curvature modification. Data were analyzed with one-way balanced analyses of variance at 2 levels (P < .05).
  
  
  RESULTS
  The instrument factor was extremely significant for both the CRr parameter (F(1) = 9.59, P = .004) and the rAe parameter (F(1) = 13.55, P = .001).
  
  
  CONCLUSIONS
  Canal modifications are reduced when the new WaveOne NiTi single-file system is used.
authors.affiliation: Department of Endodontics, University of Turin Dental School, Turin, Italy.
authors.forename: Elio
authors.initials: E
authors.lastname: Berutti
authors.forename: Giorgio
authors.initials: G
authors.lastname: Chiandussi
authors.forename: Davide Salvatore
authors.initials: DS
authors.lastname: Paolino
authors.forename: Nicola
authors.initials: N
authors.lastname: Scotti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Cantatore
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Castellucci
authors.forename: Damiano
authors.initials: D
authors.lastname: Pasqualini
mesh_terms: D003722:Dental Alloys / Q000737:chemistry; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing; D008953:Models, Anatomic; D009532:Nickel / Q000737:chemistry; D010781:Photography; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000592:standards; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium