Elnaghy, A M Cyclic fatigue resistance of ProTaper Next nickel-titanium rotary files. [electronic resource] - International endodontic journal Nov 2014 - 1034-9 p. digital Publication Type: Journal Article ISSN: 1365-2591 Standard No.: 10.1111/iej.12244 doi Subjects--Topical Terms: Materials TestingMicroscopy, Electron, ScanningNickelTitanium