Design Analysis of TMJ Implant under Physiological Loading Condition

Abstract

Equal channel angular extrusion (ECAE) is a severe plastic deformation (SPD) method for obtaining bulk nanostructured materials. The ECAE die consists of two equal channels that intersect at an angle, usually between 90。and 135。. In the present study, the plastic deformation behavior of copper during the ECAE process with 120o die was investigated. To analyze the deformation behavior and the related strain distributions in the specimen, the commercial FE code ABAQUS has been used. The properties of the materials are strongly dependent on the shear plastic deformation behavior during equal channel angular extrusion (ECAE), which is controlled mainly by die geometry, material properties, and the friction between billet and the die. The ECAE process for these conditions was explained using the two different friction conditions of 0.15 and 0.08 to all sliding surfaces. The effective strain by the theoretical equation is in good agreement with the FEM results.

Biomechanical analysis of a temporomandibular joint condylar prosthesis during various clenching tasks

“…Second, only the Christensen-brand TMJ condylar prosthesis (Chowdhury et al, 2011;Kashi et al, 2010;Mesnard et al, 2011) and three bone screws were used in the simulations; analyses of other prosthesis brands or with different numbers of bone screws have yet to be performed. Third, we only simulated the biomechanical behavior of the TMJ condylar prosthesis only (Arabshahi et al, 2011(Arabshahi et al, , 2012b(Arabshahi et al, , 2012aChowdhury et al, 2011;Kashi et al, 2010;Mesnard et al, 2011Mesnard et al, , 2014Ramos et al, 2011;Ramos et al, 2014); however, the long-term effects of TMJ condylar prosthesis remain to be identified.…”

“…In recent years, a number of research teams have used the finite element method to conduct biomechanical analyses on artificial TMJ replacements. For example, Mesnard et al (Mesnard et al, 2011, 2014;Ramos et al, 2011;Ramos et al, 2014) studied the appearance of the TMJ condylar prosthesis and the location of bone screws fixation; Kashi et al, and Chowdury et al (Chowdhury et al, 2011;Kashi et al, 2010) examined bone quality, bone screw dimensions, and surgical procedures; and Arabshahi et al (2011Arabshahi et al ( , 2012bArabshahi et al ( , 2012a explored the appearance of the TMJ condylar prosthesis. In 2010 and 2011, we extensively analyzed the effect of mandibular bone quality on TMJ condylar prosthesis and the mechanics involving the use of bone screws to fixate a TMJ condylar prosthesis (Hsu et al, , 2010.…”

“…Over the past 5 years, studies that investigated artificial TMJ replacements using FEM have provided insights into the influences of exterior design, fixation approach, and mandibular bone quality on TMJ condylar prostheses (Arabshahi et al, 2011(Arabshahi et al, , 2012b(Arabshahi et al, , 2012aChowdhury et al, 2011;Hsu et al, 2011Hsu et al, , 2010Kashi et al, 2010;Mesnard et al, 2011Mesnard et al, , 2014Ramos et al, 2011;Ramos et al, 2014). However, the effects of various clenching tasks remain unclear.…”

Analysis of temporomandibular joint prosthesis using finite element method and a patient specific design

“…Titanium alloy is considered as the TMJ prosthesis material due to its fine compatibility to human body and good mechanical properties (Arabshahi et al, 2012). Linear elastic material property was considered for different parts of the model.…”

“…Ramos et al (2015) have investigated different numbers of screws and found that three screws are fair enough to ensure about the stability and functionality of the TMJ prosthesis. Among various materials which are used to manufacture the TMJ prosthesis, titanium is known as the best due to its lower generated strain in the TMJ prosthesis compared to other materials (Arabshahi et al, 2012). Bone quality of the mandible is another factor which greatly contributes to the stability and functionality of the TMJ implant, it is investigated that the higher the modulus of elasticity of mandible, the more stability is observed during different muscle activations (Hsu et al, 2010).…”