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A mathematical model for describing the mechanical behaviour of root canal instruments
Author(s) -
Zhang E. W.,
Cheung G. S. P.,
Zheng Y. F.
Publication year - 2011
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2010.01801.x
Subject(s) - finite element method , torsion (gastropod) , root canal , curvature , structural engineering , mathematical model , root (linguistics) , bending , point (geometry) , deformation (meteorology) , materials science , mathematics , engineering , geometry , orthodontics , composite material , statistics , surgery , medicine , linguistics , philosophy
Zhang EW, Cheung GSP, Zheng YF. A mathematical model for describing the mechanical behaviour of root canal instruments. International Endodontic Journal , 44 , 72–76, 2011. Abstract Aim The purpose of this study was to establish a general mathematical model for describing the mechanical behaviour of root canal instruments by combining a theoretical analytical approach with a numerical finite‐element method. Method Mathematical formulas representing the longitudinal (taper, helical angle and pitch) and cross‐sectional configurations and area, the bending and torsional inertia, the curvature of the boundary point and the (geometry of) loading condition were derived. Torsional and bending stresses and the resultant deformation were expressed mathematically as a function of these geometric parameters, modulus of elasticity of the material and the applied load. As illustrations, three brands of NiTi endodontic files of different cross‐sectional configurations (ProTaper, Hero 642, and Mani NRT) were analysed under pure torsion and pure bending situation by entering the model into a finite‐element analysis package (ANSYS). Results Numerical results confirmed that mathematical models were a feasible method to analyse the mechanical properties and predict the stress and deformation for root canal instruments during root canal preparation. Conclusions Mathematical and numerical model can be a suitable way to examine mechanical behaviours as a criterion of the instrument design and to predict the stress and strain experienced by the endodontic instruments during root canal preparation.