Endodontic files with hybrid metallurgical elastic characteristics and identification colors

A method of manufacturing a set of austenite/martensite NiTi endodontic files, comprising:

• a) grinding one or more NiTi wires;
• b) optionally shaping the one or more NiTi wires into a blade;
• c) optionally grinding the proximal and distal tips of the bladed one or more NiTi wires;
• d) cleaning the ground bladed one or more NiTi wires by ultrasonication;
• e) heating the sonicated one or more NiTi wires;
• f) cooling said heated one or more NiTi wires;
• and
• g) assembling an endodontic file from the cooled one or more NiTi wires, wherein said endodontic file comprises a handle, smooth shaft and blade, wherein color of the resulting NiTi wire is indicative of degree of cyclic fatigue resistance, torsional fatigue resistance or both.

A method of manufacturing a set of austenite/martensite NiTi endodontic files, comprising:

• a) grinding one or more NiTi wires;
• b) cleaning the ground one or more NiTi wires by ultrasonication;
• c) heating the sonicated one or more NiTi wires to between about 350° C. to about 550° C. for a time sufficient to produce TiO, pure Ni and NiTi in a B2 phase on an external surface layer;
• d) cooling said heated one or more NiTi wires;
• and
• e) assembling an endodontic file from the cooled one or more NiTi wires, wherein said endodontic file comprises a handle, smooth shaft and blade, wherein the one or more NiTi wires have different diameters, and wherein color of the resulting NiTi wire is indicative of degree of cyclic fatigue resistance, torsional fatigue resistance or both.