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Abstract
Within the last 15 years, the endodontic community has experienced a shift from the use of conventional stainless steel instruments to the use of Ni-Ti instruments. Stainless instruments have shown to be very rigid and can cause ledging and perforation during treatment. On the other hand the incidence of ledging and perforation is greatly reduced when using Ni-Ti instruments. Once Ni-Ti instruments were introduced and combine with rotary instrumentation, it produces faster, rounder and more centered preparations. A lot of research has been done along the years to evaluate rotary Ni-Ti instruments yet few studies have been done to assess the surface properties of these instruments. Assessment of these instruments may shed a light on the issue of number of instruments uses and may allow the discovery of ”early warning signs” that could help clinicians in judging when to discard them.This study was designed to compare both(Revo-S and HeroShaper) Ni-Ti rotary files in shaping, centering ability andappearance of root canals