Influence of cross-sectional design and dimension on mechanical behavior of nickel-titanium instruments under torsion and bending: a numerical analysis

Journal of Endodontics
En-Wei ZhangYu-feng Zheng

Abstract

The aim of this study was to examine the influence of the cross-sectional configuration and dimensions (size and taper) on the torsional and bending behavior of nickel-titanium rotary instruments, taking into account the nonlinear mechanical properties of material. Ten cross-sectional configurations, square, triangular, U-type, S-type (large and small), convex-triangle, and 4 proprietary ones (Mani NRT and RT2, Quantec, and Mtwo), were analyzed under torsion or bending by using a 3-dimensional finite element method. The von Mises stresses were correlated with the critical values for various phases of the nickel-titanium material. Different loading conditions led to unequal patterns of stress distribution. Increasing the applied torque or bending angle resulted in a rise in the corresponding stresses in the instrument. Favorable stress distribution without dangerous stress concentration was observed if the material was undergoing superelastic transformation at that applied load. The ultimate strength of the material was not exceeded when the instrument was bent up to a 50-degree curvature. On the other hand, when a torsional moment of greater than 1.0 N*mm was applied, the maximum stresses developed in some designs would exceed ...Continue Reading

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Citations

Mar 29, 2014·Journal of Endodontics·Gustavo De-DeusEdson Jorge Moreira
Nov 19, 2013·Journal of Endodontics·Juan José Pérez-HiguerasJosé C de la Macorra
Oct 22, 2013·Journal of Endodontics·Leandro de Arruda SantosVicente Tadeu Lopes Buono
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Dec 5, 2013·Restorative Dentistry & Endodontics·Abdulrahman Mohammed SalehFaahim Rashid
Nov 17, 2016·Restorative Dentistry & Endodontics·Jung-Hong HaHyeon-Cheol Kim
May 16, 2019·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Gustavo de Cristofaro AlmeidaMaria Guiomar de Azevedo Bahia
Mar 9, 2019·Journal of Investigative and Clinical Dentistry·Eugenio PedullàSimone Grandini
Dec 10, 2020·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Theodoro WeissheimerMarcus Vinícius Reis Só
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Jan 1, 2015·The Journal of Contemporary Dental Practice·Ranya F ElemamJohn West
Jun 10, 2021·European Journal of Oral Sciences·Philip Y-H ChienOve A Peters

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