The tool has a work portion (4) formed of a predetermined length from a tip (3), and straight shank (5) that is formed in continuous manner with the work portion. The work portion has a shape memory characteristic in a range of a predetermined length from the tip and a superelastic characteristic in a remaining portion. The work portion has various cross sections e.g. rectangle or square, so as to exert its unique function. An independent claim is also included for a method of manufacturing a root canal treatment tool.
