Van der Vyver, Petrus JacobusPaleker, FarzanaVorster, MartinDe Wet, Francois A.2018-12-102019-01Van der Vyver, P.J., Paleker, F., Vorster, M. et al. 2019, Root canal shaping using nickel titanium, m-wire, and gold wire : a micro–computed tomographic comparative study of One Shape, ProTaper Next, and WaveOne Gold instruments in maxillary first molars', Journal of Endodontics, vol. 45, no. 1, pp. 62-67.0099-2399 (print)1878-3554 (online)10.1016/j.joen.2018.09.013http://hdl.handle.net/2263/68074INTRODUCTION : The aim of this study was to evaluate the root canal shaping effect of instruments manufactured from nickel titanium, M-Wire, and Gold wire with different glide path preparation techniques. METHODS : One hundred thirty-five mesiobuccal canals of extracted human maxillary molars were randomly divided into 3 equal groups (N = 45) for glide path preparation with K-files (KF) (Dentsply Sirona, Ballaigues, Switzerland), One G (OG) files (Micro-Mega, Besançon, France), and ProGlider (PG) files (Dentsply Sirona). Specimens of each glide path group were further divided equally into 3 groups for instrumentation with ProTaper Next (PTN, Dentsply Sirona), One Shape (OS, Micro-Mega), and WaveOne Gold (WOG, Dentsply Sirona) systems (n = 15). Micro–computed tomographic imaging was used to scan teeth before instrumentation and after shaping to compare centering ratio and canal transportation values at the apical, midroot, and coronal levels and the overall changes in canal volume. Data sets were statistically analyzed (analysis of variance and Kruskal-Wallis H tests). RESULTS: The centering ratios for all groups were statistically similar at all levels. Apical canal transportation was significantly high for K/OS and K/PTN (P = .003). Midroot canal transportation was significantly high for K/PTN, K/OS, and OG/OS (P = .0003). Coronal canal transportation was significantly high for K/PTN and K/OS (P = .011). The highest change in canal volume was observed with all PTN groups and the lowest with PG/WOG (P = .06). CONCLUSIONS : WOG manufactured from Gold wire combined with PG showed better root canal shaping ability and removed less dentin from the canal walls. The nickel-titanium (OS) and M-Wire (PTN) instruments used in combination with KF significantly transported more canals. PTN removed the most dentin from the canal walls regardless of the GPP technique.en© 2018 American Association of Endodontists. Notice : this is the author’s version of a work that was accepted for publication in Journal of Endodontics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Endodontics, vol. 45, no. 1, pp. 62-67, 2019, doi : 10.1016/j.joen.2018.09.013.Centering abilityChanges in canal volumeGlide pathReciprocationRotationTransportationRoot canal shapingNickel titaniumM-WireGold wireK-files (KF)One G (OG) filesProGlider (PG) filesWaveOne Gold (WOG)ProTaper Next (PTN)One Shape (OS)Postprint Article