EdgeFile X7 17/.04 required significantly less preparation time (3.75 seconds interquartile range : 3.2–9.0) than ProTaper NEXT X1 (15.45 seconds IQR: 8.35–21.1) ( No differences were found between the instruments regarding the maximum (peak) torque values ( No instrument exhibited flute deformation or underwent intracanal failure. Test with a significance level set at 5%. Operative torque (N.cm) and preparation time (s) of the first shaping instrument (size 17/.04) of both rotary systems were recorded and statistically compared using the Mann–Whiney The instruments were rotated at 300 rpm with maximum torque set at 2 N.cm using an electric motor (KaVo Biberach, Germany) that automatically recorded torque values at every 1/10th of a second (ds). Each canal in each tooth was prepared with one of the rotary systems ( Ten double-rooted maxillary premolars with independent canals were selected. Study evaluated the operative torque and preparation time of ProTaper NEXT (Dentsply Maillefer Ballaigues, Switzerland) and EdgeFile X7 (EdgeEndo Albuquerque, New Mexico, United States) rotary systems during root canal preparation of maxillary premolars.
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