A method for manufacturing a nonlinear superelastic file comprising thesteps providing a superelastic file having a shaft and a file axis； providinga fixtureincluding a groove being defined by one or more displacement members, the filegroove configured receiving the shaft； inserting at least a portion of theshaft into thefixture along the file groove the portion of the shaft including a firstportion of theshaft； contacting the first portion of the shaft with a first displacementmember of theone or more displacement members such that first portion of the shaft isdisplacedfrom the file axis thereby forming a first offset portion of shaft； heatingthe portion ofthe shaft while inserted in the fixture to a temperature of at least about300°C for atime period of at least about 1 minute to shape-set the portion of the shafttherebyforming a shape-set nonlinear file.
