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06 November 2019

Nickel Titanium vs M-Wire vs Gold Wire: which guarantees the best root canal shaping?

Simona Chirico


In these years, different kind of rotary instruments were created for root canal shaping. The aim of using these instruments was to create a correct tapered shaped canal in order to respect the original canal anatomy and avoid canal transportation, ledge formation and perforations. Rotary instruments can be of different wire: Nichel Titanium, M-Wire, Gold-wire. 

Which is the best between these?  

The study published in the Journal of Endodontics by Van Der Vyver et al tried to answer this question. In fact, the aim of this study was to 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

MATERIALS AND 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, Besanc ̧on, 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. Api- cal 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. 

(Photocredit: Dr. Simona Chirico)

For additional informations:  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 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

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