In a torsional stress comparison, twisted files absorbed more energy before fracture than ground blanks 1. All gt files should be used with light force and at the correct spin speed. The aim of the present study was to assess the centreing ability of the protaper universal rotary system in curved roots in comparison to nitiflex files, by means of preoperative and postoperative. Twisted files can withstand approximately 60% more torque than files made using a traditional manufacturing process. The torque recommende d by the manufacturer was then applied. Autodesk simulation multiphysics software was used to program the mechanical properties of the files, as well as a fracture failure limit of 1270. Maestria en ciencias odontologicas con especialidad en endodoncia. Sistemas rotatorios en endodoncia naturaleza ingenieria. Some of the products and designations mentioned in the text are trademarked, patented or ed. Removal using various sizes and tapers of profile gt files. Protaper shaping x sxshaping x sx shaping 1 s1 shaping 2 s2 shaping 1 s1 shaping 2 s2 finishing files f1 f2 f3finishing files f1 f2 f3 63. None phase of endodontic treatment has showed significant evolution as the instrumentation, due to the expressive development of the rotary files, what justifies the need of studies regarding this matter. Instrumentacion reciprocante en endodoncia by catalina.
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