Ha, J H 'Screw-in' tendency of rotary nickel-titanium files due to design geometry. [electronic resource] - International endodontic journal Jul 2015 - 666-72 p. digital Publication Type: Journal Article ISSN: 1365-2591 Standard No.: 10.1111/iej.12363 doi Subjects--Topical Terms: Dental AlloysDental InstrumentsDental Stress Analysis--methodsElasticityEquipment DesignFinite Element AnalysisNickelRoot Canal Preparation--instrumentationStress, MechanicalTitaniumTorsion, Mechanical