Canal Shaping with WaveOne Primary Reciprocating Files and ProTaper System: A Comparative Study

Introduction: 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 Pro Taper (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 Path File 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 Pro Taper S1-S2-F1-F2 at the WL and specimens in group 2 were shaped with Wave One 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. (J Endod 2012;38:505-509)