Chemo-mechanical instrumentation of the root canal system results in significant reduction of microorganisms Hulsmann et al. (2005)Averbach&Kleier (2006) and is thus essential for successful root canal treatment. This includes the removal of the infected dentine and organic tissue by shaping and dissolution. Several studies have assessed the cleaning ability of different root canal instruments and proved that currently no instrument can predictably clean the entire root canal system Usman et al. (2004), Haapasalo  et al. (2005), paque et al (2009), Fornai et al. (2010). Since the introduction of the Nickel Titanium in the manufacture of the rotary files it has been so popular because of its two unique properties, the shape memory and super-elasticity. (1) Nickel titanium instruments are more flexible than stainless steel instruments and have the ability to revert to their original shape after flexure (2). Over the decades, a wide array of nickel–titanium (NiTi) instruments has been introduced for shaping root canals. Each generation of instruments has had something new to offer and has been intended to improve upon previousgenerations. Many variables and physical properties influence the clinical performance of NiTi rotaries. Ultimately, clinical experience, handling properties, safety, and case outcomes should decide the fate of a particular instrument design.