Abstract: A method for manufacturing a shape-set nonlinear non-superelastic file comprising the steps of: providing a superelastic file having a shaft and a file axis; providing a fixture including a file path being defined by one or more displacement members, the file path configured for receiving the shaft; inserting at least a portion of the shaft into the fixture along the file path, the portion of the shaft including a first portion of the shaft; contacting the first portion of the shaft with a first displacement member of the one or more displacement members such that the first portion of the shaft is displaced from the file axis thereby forming a first offset portion of the shaft; heating the portion of the shaft while inserted in the fixture to a temperature of at least about 350° C. to about 600° C.