Related Papers
Finite Element Analysis of a TI6AL4V (Eli) Medical Implant Produced Through Additive Manufacturing
2017 •
Francis Monaheng
Published ThesisMedical implants created by Ti6Al4V (ELI) through Additive Manufacturing (AM) processes have a very positive impact on the quality of life of patients who have undergone skeletal reconstructive surgery. The effectiveness of medical implant design for AM processes would be significantly improved if finite element analysis (FEA) could be established as an accepted design tool. This study is aimed at validating FEA as a tool for predicting the strain distribution in a Ti6Al4V (ELI) medical implant produced through a selective laser melting (SLM) process by comparing the FEA results with strain gauge measurements. The approach followed was to demonstrate the correlation between an FEA model and strain gauge measurements performed on a human mandibular implant. For the design of the mandibular implant the geometrical data of an adult human mandible obtained from a computer tomography (CT) scan was transferred to a computer-aided design (CAD) software package. A CAD model ...
Laser Powder Bed Fusion Process Defects and Mechanical Properties of Ti 6 Al 4 V Eli Mandible Implants
2019 •
Ina Yadroitsava
Ensuring additive manufactured metal based components are free of major defects is crucial to fulfil medical requirements for clinical applications. Random porosity, high surface roughness and deformation during processing are the main current drawbacks in laser powder bed fusion parts. The prediction of defective samples’ mechanical properties with numerical simulations is highly important to understand the effect of these defects. A step-by-step systematic approach of determining defects in laser powder bed fusion (LPBF) and their influence on mechanical properties will be used for the current research. This paper presents the first successful steps in this project. johanadriaanwessels@gmail.com anton2@sun.ac.za jels@cut.ac.za iyadroitsava@cut.ac.za iyadroitsau@cut.ac.za 1 Department of Department of Mechanical and Mechatronics Engineering, Central University of Technology, Free State, Bloemfontein, South Africa 2 University of Stellenbosch, CT Scanner Facility, Stellenbosch, Sout...
Journal of Craniofacial Surgery
Stress Distribution in Single Dental Implant System
2015 •
Melody Diaz
Biomimetics
Three-Dimensional FEA Analysis of the Stress Distribution on Titanium and Graphene Frameworks Supported by 3 or 6-Implant Models
Mohammed Mustafa
Titanium is the main component of dental implants. It is also routinely used as a framework material for implant-supported full-arch prostheses due to its low density, biocompatibility, and other mechanical properties. Remarkable mechanical properties such as lesser mass density and higher young’s modulus of graphene have gained popularity among scientists, improving the properties of biomedical implants. Thus, our study aimed to compare the outcome through the von Mises stresses generated on All-on-6 and All-on-3 implant models, as well as on the framework, and evaluate the effect of stress patterns on the crestal bone around implants in the mandible. FEA (Finite Element Analysis) study was carried out using edentulous mandible models. Four 3D FEA models with 3 and 6 implants were used (Model 1: Titanium bar-supported 6 straight implants; Model 2: Graphene bar-supported 6 straight implants; Model 3: Titanium bar-supported 3 implants with 30 degrees-tilted; Model 4: Graphene bar-sup...
Finite Element Analysis (FEA) Of a Premaxillary Device: A New Type of Subperiosteal Implant to Treat Severe Atrophy of the Maxilla
Tea Romasco
Extreme atrophy of the maxilla poses still challenging for the clinicians. Some of the techniques used could be complex, risky, expensive, time consuming and should be performed, preferably, only by skilled surgeons. Most the commonly used techniques have been reported to have very high success percentages; however, sometimes complications may occur. In this regard, Premaxillary Device (PD) is a technique that has been devised to render more simple the reconstruction of extremely atrophic maxilla, trying to avoid more complicated and risky surgical procedures. Finite Element Analysis (FEA) allows evaluation of several differen aspects of dental implant biomechanics. Our results showed that the use of PD allows an optimal distribution of the stresses on the basal bone, avoiding tension peaks that could determine bone resorption or, even, implant failure. ANSYS has been used to perform this type of localized finite element analysis; with this type of analysis, it was possible to analy...
Applied Sciences
Fabrication and Analysis of a Ti6Al4V Implant for Cranial Restoration
2019 •
Usama Umer
A custom made implant is critical in cranioplasty to cushion and restore intracranial anatomy, as well as to recover the appearance and attain cognitive stability in the patient. The utilization of customized titanium alloy implants using three-dimensional (3D) reconstruction technique and fabricated using Electron Beam Melting (EBM) has gained significant recognition in recent years, owing to their convenience and effectiveness. Besides, the conventional technique or the extant practice of transforming the standard plates is unreliable, arduous and tedious. As a result, this work aims to produce a customized cranial implant using 3D reconstruction that is reliable in terms of fitting accuracy, appearance, mechanical strength, and consistent material composition. A well-defined methodology initiating from EBM fabrication to final validation has been outlined in this work. The custom design of the implant was carried out by mirror reconstruction of the skull’s defective region, acqui...
Frontiers in Mechanical Engineering
A scoping review of the additive manufacturing of mandibular implants
2023 •
Rifky Ismail
Evaluation of the Compressive Mechanical Properties of Cellular DMLS Structures for Biomedical Applications
2016 •
Lehlohonolo Monaheng
In vivo bone strain and finite element modeling of a rhesus macaque mandible during mastication
Olga Panagiotopoulou, Callum Ross
A B S T R A C T Finite element analysis (FEA) is a commonly used tool in musculoskeletal biomechanics and vertebrate pa-leontology. The accuracy and precision of finite element models (FEMs) are reliant on accurate data on bone geometry, muscle forces, boundary conditions and tissue material properties. Simplified modeling assumptions, due to lack of in vivo experimental data on material properties and muscle activation patterns, may introduce analytical errors in analyses where quantitative accuracy is critical for obtaining rigorous results. A subject-specific FEM of a rhesus macaque mandible was constructed, loaded and validated using in vivo data from the same animal. In developing the model, we assessed the impact on model behavior of variation in (i) material properties of the mandibular trabecular bone tissue and teeth; (ii) constraints at the temporomandibular joint and bite point; and (iii) the timing of the muscle activity used to estimate the external forces acting on the model. The best match between the FEA simulation and the in vivo experimental data resulted from modeling the trabecular tissue with an isotropic and hom*ogeneous Young's modulus and Poisson's value of 10 GPa and 0.3, respectively; constraining translations along X,Y, Z axes in the chewing (left) side temporomandibular joint, the premolars and the m 1 ; constraining the balancing (right) side temporomandibular joint in the anterior-posterior and superior-inferior axes, and using the muscle force estimated at time of maximum strain magnitude in the lower lateral gauge. The relative strain magnitudes in this model were similar to those recorded in vivo for all strain locations. More detailed analyses of mandibular strain patterns during the power stroke at different times in the chewing cycle are needed.
The International Journal of Advanced Manufacturing Technology
Integrative and multi-disciplinary framework for the 3D rehabilitation of large mandibular defects
2020 •
Usama Umer
