Titre : An equivalent isotropic approximation for reliability-based design of mini-plate fixation used in fractured mandibles 

Auteurs : G. Kharmanda, M-Y Kharma, A. El-Hami,  

Revue : Uncertainties and Reliability of Multiphysical Systems 

Numéro : Issue 1 

Volume : 2 

Date : 2018/05/16 

DOI : 10.21494/ISTE.OP.2018.0254 

ISSN : 2514-569X 

Résumé : The objective of this work is to assess the reliability level of mini-plate fixation following surgical operation. A 3-dimensional finite element model is developed in order to study the negative effect due to the stabilization of the fracture. Since muscles can be cut or harmed during surgery and consequentially cannot operate at its maximum capacity, there is a strong need to introduce loading uncertainties in order to obtain reliable designs. Several scenarios (or modes) may lead to failure. The first important failure scenario is the von Mises stress of all components which presents the fracture indicators. The bone structure possesses anisotropic behaviors. An optimized yield stress/elasticity modulus formulation is integrated using an equivalent isotropic approximation in order to reduce the computing time. The second failure scenario is the contact pressure which should not exceed a maximum pressure pain threshold. The last failure mode is the relative displacement (gap) between two fracture surfaces which should not exceed a prescribed value in order to obtain rapid bone healing. A reliability algorithm is next developed to identify the single and multiple failure mode cases. The different results are carried out considering a clinical case of a male patient of 28 years of age. 

Éditeur : ISTE OpenScience