The torsional properties of conventionally twisted K-type endodontic files and recently
developed machined K-type endodontic files were compared. File sizes 10 through 40 were
subjected to torsional load in clockwise and counterclockwise directions independently.
Results showed that a statistically significant reduction in clockwise rotation occurred at
failure with all of the machined files except size 10. Counterclockwise rotation at failure was
also significantly lower for the machined files in sizes 10 through 30. There was no …