3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli

The aim of the present investigation was to calculate stress distribution generated in root dentine canal during mechanical rotation five different NiTi endodontic instruments by means a finite element analysis (FEA). Two conventional alloy F360 25/04 and F6 Skytaper 25/06, comparison three heat treated alloys NiTI Hyflex CM 25/04, Protaper Next 25/06 One Curve were considered analyzed. instruments’ flexibility (reaction force) geometrical features (cross section, conicity) previously investigated. For each instrument, canals with two elastic moduli(18 42 GPa) simulated defined apical ratios. Ten CAD instrument models created their behaviors analyzed 3D-FEA. Static structural analyses performed non-failure condition, since linear behavior assumed for all components. All area concentration correspondence curvature at approx. 7 mm from apex. maximum values found when highest modulus canal. Strain von Mises patterns showed higher first part curved radius instruments. Conventional Ni-Ti demonstrated magnitudes, regardless conicity 4% 6%, they sound, as well mineralized canals. Heat-treated reduced map. displayed lowest of, respectively, 35.73 44.30 GPa sound dentine. rotary influenced moduli rigidity.