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Previously published studies have deeply investigated the characteristics of flexural and torsional resistance of nickel-titanium rotary instruments, but none of them investigated the relationship between the 2 stresses. The objective of the present study was to evaluate the influence of flexural stresses over torsional resistance. -One 20.04 files (Fanta Dental, Shanghai, China) were used in the present study (N = 6 and divided into 3 test groups of 20 files. A customized device made of a mobile structure with a connection that holds