A method of forming a dental tool or instrument having a memorized shape. The method comprises selecting a nitinol wire having an initial transition temperature below room temperature； grinding the nitinol wire to form the dental tool or instrument so as to have a shank, located adjacent a first end, and a working area, with at least one cutting edge, located adjacent an opposite second leading end； molding the working area into a molded shape having at least one protrusion formed therein； heating the dental tool or instrument to both: a) alter the initial transition temperature of the dental tool or instrument to a final transition temperature, and b) memorize the molded shape including the at least one protrusion so that the dental tool or instrument will automatically return to the molded shape having the at least one protrusion when at a temperature at or above the final transition temperature
