Caracteristicas de diseño de las limas # 25 de los sistemas Hyflex EDM, One Curve y One Reci. Estudio descriptivo

Abstract

Summary: Knowledge of design features improves the use of Niti instruments. Objective: Describe the design features of the Hyflex EDM, One Curve and One Reci files, using a 3D Infinite Focus G6 optical measuring instrument and Scanning Electron Microscope (SEM). Method: This descriptive in vitro study used two new files from the Hyflex EDM, One Curve and One Reci systems without visible defects. The taper, cutting angle, attack, incidence, helical, roughness and distance between the grooves in D1, D6 and D14 were observed. Results: The taper of the One curve file does not coincide with that reportedfor Coltene, the Hyflex EDM file presented the same taper that the commercial company stipulates and One Reci only presented a different taper in D6 with 2.9%. One Curve presented angles of incidence smaller than the angle of attack, Hyflex EDM and One Reci presented angles of incidence greater than the angles of attack. The roughness of Hyflex EDM had the highest values in Ra due to its electrical discharge machining. Conclusions: Hyflex EDM presented a smaller distance between grooves per millimeter, non-constant helical angle and high roughness. One Curve features a variable groove spacing, positive helical angle, sharp angle of incidence and attack. One Reci has angles of attack that are more acute than angles of incidence and one of its cutting angles was obtuse.