Microcomputed Assessment of Transportation, Centering Ratio, Canal Area, and Volume Increase after Single-file Rotary and Reciprocating Glide Path Instrumentation in Curved Root Canals: A Laboratory Study

Published:March 30, 2019DOI:


      • We compared the shaping abilities of the ProGlider (PG), WaveOne Gold Glider (WOGG), and R-Pilot (RP) single-file glide path nickel-titanium file systems using micro–computed tomographic imaging.
      • The changes in the volume and surface area in the PG group were found to be significantly higher than in the WOGG and RP groups.
      • From the perspective of transportation, there was no significant difference at the apical third between all groups, but less transportation was observed in the WOGG and RP groups compared with the PG group at the middle and coronal thirds.



      The aim of this study was to compare the transportation and centering abilities of the ProGlider (PG; Dentsply-Sirona, Ballaigues, Switzerland), WaveOne Gold Glider (WOGG; Dentsply-Sirona), and R-Pilot (RP; VDW, Munich, Germany) file systems and the changes in the structure model index (SMI), surface area, and root canal volume (after creating the glide path in the mandibular first molar teeth’s mesial canals with moderate curvature) using the micro–computed tomographic (micro-CT) method.


      In the present study, 24 mandibular first molar teeth with 2 separate mesial canals and moderate (10°–20°) curvature were used. After scanning with micro-CT imaging before the procedure, the teeth were divided into 3 groups, PG, WOGG, and RP (n = 10/each group), followed by the glide path procedure. After the root canal preparation, changes in the root canals regarding the volume, surface area, SMI, transportation made by the files, and the change of their centering ability in the apical, middle, and coronal third were analyzed by micro-CT imaging. The data were statistically evaluated using 1-way analysis of variance and the Kruskal-Wallis test with a significance level set at 5% (P < .05).


      The WOGG and RP file systems showed better centering abilities at all thirds compared with the PG file system (P < .05). No significant difference was found in the apical third between the groups in terms of canal transportation degree (P > .05). However, in the WOGG and RP groups, less transportation was observed in the middle and coronal thirds compared with the PG group (P < .05). When the SMI changed, after the root canal preparation was compared, no significant differences were found between the groups (P > .05). Nevertheless, the changes in volume and surface area of the root canal in the WOGG and RP groups were significantly lower than in the PG group (P < .05).


      The WOGG and RP file systems caused similar levels of change in the root canal systems based on all parameters. Moreover, it was determined that the PG file system caused a significantly higher volume and surface area increase than the WOGG and RP file systems.

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        • You S.-Y.
        • Kim H.-C.
        • Bae K.-S.
        • et al.
        Shaping ability of reciprocating motion in curved root canals: a comparative study with micro–computed tomography.
        J Endod. 2011; 37: 1296-1300
        • Alovisi M.
        • Cemenasco A.
        • Mancini L.
        • et al.
        Micro-CT evaluation of several glide path techniques and ProTaper Next shaping outcomes in maxillary first molar curved canals.
        Int Endod J. 2017; 50: 387-397
        • Paleker F.
        • van der Vyver P.J.
        Comparison of canal transportation and centering ability of K-files, ProGlider file, and G-files: a micro-computed tomography study of curved root canals.
        J Endod. 2016; 42: 1105-1109
        • Zheng L.
        • Ji X.
        • Li C.
        • et al.
        Comparison of glide paths created with K-files, PathFiles, and the ProGlider file, and their effects on subsequent WaveOne preparation in curved canals.
        BMC Oral Health. 2018; 18: 152-156
        • Bürklein S.
        • Poschmann T.
        • Schäfer E.
        Shaping ability of different nickel-titanium systems in simulated S-shaped canals with and without glide path.
        J Endod. 2014; 40: 1231-1234
        • Kirchhoff A.L.
        • Chu R.
        • Mello I.
        • et al.
        Glide path management with single- and multiple-instrument rotary systems in curved canals: a micro-computed tomographic study.
        J Endod. 2015; 41: 1880-1883
        • Uslu G.
        • Özyürek T.
        • Yılmaz K.
        • Gündoğar M.
        Cyclic fatigue resistance of R-Pilot, HyFlex EDM and PathFile nickel-titanium glide path files in artificial canals with double (S-shaped) curvature.
        Int Endod J. 2018; 51: 584-589
        • Özyürek T.
        • Uslu G.
        • Gündoğar M.
        • et al.
        Comparison of cyclic fatigue resistance and bending properties of two reciprocating nickel-titanium glide path files.
        Int Endod J. 2018; 51: 1047-1052
        • De-Deus G.
        • Belladonna F.G.
        • Souza E.M.
        • et al.
        Micro–computed tomographic assessment on the effect of ProTaper Next and Twisted File Adaptive systems on dentinal cracks.
        J Endod. 2015; 41: 1116-1119
        • Schneider S.W.
        A comparison of canal preparations in straight and curved root canals.
        Oral Surg Oral Med Oral Pathol. 1971; 32: 271-275
        • Yılmaz K.
        • Özyürek T.
        Apically extruded debris after retreatment procedure with Reciproc, ProTaper Next, and Twisted File Adaptive instruments.
        J Endod. 2017; 43: 648-651
        • Hildebrand T.
        • Rüegsegger P.
        Quantification of bone micro architecture with the structure model index.
        Comput Methods Biomech Biomed Engin. 1997; 1: 15-23
        • Versiani M.A.
        • Pécora J.D.
        • Sousa-Neto M.D.
        Microcomputed tomography analysis of the root canal morphology of single-rooted mandibular canines.
        Int Endod J. 2013; 46: 800-807
        • Gambill J.M.
        • Alder M.
        • Carlos E.
        Comparison of nickel-titanium and stainless steel hand-file instrumentation using computed tomography.
        J Endod. 1996; 22: 369-375
        • Pedulla E.
        • Plotino G.
        • Grande N.M.
        • et al.
        Shaping ability of two nickel-titanium instruments activated by continuous rotation or adaptive motion: a micro-computed tomography study.
        Clin Oral Investig. 2016; 20: 2227-2233
        • Pasqualini D.
        • Bianchi C.C.
        • Paolino D.S.
        • et al.
        Computed micro-tomographic evaluation of glide path with nickel-titanium rotary PathFile in maxillary first molars curved canals.
        J Endod. 2012; 38: 389-393
        • Siqueira Jr., J.F.
        • Alves F.R.
        • Versiani M.A.
        • et al.
        Correlative bacteriologic and micro-computed tomographic analysis of mandibular molar mesial canals prepared by self-adjusting file, reciproc, and twisted file systems.
        J Endod. 2013; 39: 1044-1050
        • Saber S.E.
        • Nagy M.M.
        • Schafer E.
        Comparative evaluation of the shaping ability of WaveOne, Reciproc and OneShape single-file systems in severely curved root canals of extracted teeth.
        Int Endod J. 2015; 48: 109-114
        • Gergi R.
        • Osta N.
        • Bourbouze G.
        • et al.
        Effects of three nickel titanium instrument systems on root canal geometry assessed by micro-computed tomography.
        Int Endod J. 2015; 48: 162-170
        • Vorster M.
        • van der Vyver P.J.
        • Paleker F.
        Canal transportation and centering ability of WaveOne Gold in combination with and without different glide path techniques.
        J Endod. 2018; 44: 1430-1435
        • Gergi R.
        • Arbab-Chirani R.
        • Osta N.
        • Naaman A.
        Micro-computed tomographic evaluation of canal transportation instrumented by different kinematics rotary nickel-titanium instruments.
        J Endod. 2014; 40: 1223-1227
        • Marzouk A.M.
        • Ghoneim A.G.
        Computed tomographic evaluation of canal shape instrumented by different kinematics rotary nickel-titanium systems.
        J Endod. 2013; 39: 906-909
        • Tambe V.H.
        • Nagmode P.S.
        • Abraham S.
        • et al.
        Comparison of canal transportation and centering ability of rotary ProTaper, One Shape System, and Wave One System using cone beam computed tomography: an in vitro study.
        J Conserv Dent. 2014; 17: 561-565
        • van der Vyver P.J.
        • Paleker F.
        • Vorster M.
        • de Wet F.A.
        Micro-computed tomographic evaluation of two single rotary glide path systems.
        Int Endod J. 2019; 52: 352-358