Analysis of nickel-titanium versus stainless steel instrumentation by means of direct digital imaging

The use of computed tomography when comparing nickel–titanium and stainless steel files during preparation of simulated curved canals

“…Our findings related to better apical centring ratios for Ni–Ti files are consistent with the results obtained by Coleman et al (1996) and Coleman & Svec (1997) and Carvalho et al . (1999), whilst they differ from those of Glosson et al .…”

“…As in the studies of Briseño & Sonnabend (1991), Schäfer & Tepel (1993), Coleman et al . (1996) and Coleman & Svec (1997), no irrigation solution was used.…”

A Comparison of Time Needed for Instrumentation of Simulated Curved Canals by Using Different Files

“…Coleman et al (5) also found that time of instrumentation was greater for Ni-Ti files compared with SS in natural teeth, but the difference was not significant.…”

“…Simulated canals were selected for root canal preparation in this study and other studies because the size , curvature and material characteristics are identical in all canals and good comparability of the results could be expected (5,7,8,9) .…”

“…Nickel Titanium ( Ni-Ti ) alloy has been shown to be exceptionally elastic , having a lower bending moment and lower permanent set after torsion compared with similar gauge stainless steel (S.S.). Hand and rotary files fabricated from Ni-Ti alloy are now available which have expanded the therapeutic options available for root canal preparation and are claimed to be superior in curved canals (5) .…”