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Over the past two decades, the nickel-titanium(NiTi)rotary instruments have highly improved the quality of the cleaning and shaping of the root canals.The superelasticity and shape memory of these instruments reduce the possibility of the canal transportation along with saving the time for both the patients and the clinicians.Several commercial types of these instruments, produced by manufacturers ,have currently become available by modifying the characteristics of the wonder NiTi alloy and also the design of endodontic file system .Upto this date,five generations for NiTi rotary instruments...