BACKGROUND As various implant geometries present different biomechanical behaviors, the purpose of this work was to study stress distribution around tapered and cylindrical threaded implant geometries using three-dimensional finite element stress analysis. METHODS Seven implant models were constructed using Computer Assisted Designing system. After digitized models of mandibular section, the ...

This paper presents a needle-tissue interaction model that is a 3D extension of a prior work based on the finite element method. The model is also adapted to accommodate arbitrary meshes so that the anatomy can effectively be meshed using third-party algorithms. Using this model a prostate brachytherapy simulator is designed to help medical residents acquire needle steering skills. This simulat...

Non-carious cervical tooth lesions for many decades were attributed to the effects of abrasion and erosion mainly through toothbrush trauma, abrasive toothpaste, and erosive acids. However, though the above may be involved, more recently a biomechanical theory for the formation of these lesions has arisen, and the term abfraction was coined. The aim of this study was to investigate the biomecha...

We present a new approach for the computation of the deformation field between three dimensional (3D) images. The deformation field locally minimizes the sum of the squared differences between the images to be matched and is constrained by the physical properties of the different objects represented by the image. The objects are modeled as elastic bodies. Compared to optical flow methods, this ...

OBJECTIVES Headgears are among the effective orthodontic appliances to achieve treatment goals. Unilateral molar distal movement is sometimes needed during an orthodontic treatment, which can be achieved by an asymmetric headgear. Different unilateral headgears have been introduced. The main goal of this study was to analyze the force system of unilateral expanded outer bow asymmetric headgears...

A simple approach based on centroidal Voronoi tessellation (CVT) is proposed here to create three-dimensional microstructures, for crystal plasticity finite element (CPFE) simulations. In the proposed approach, the grain morphology for any given specimen geometry is created with a predetermined grain size. Instead of using the conventional way that generates the Voronoi cells first and then mes...

We propose a method for structural optimization that combines two different ways of depicting shapes : the considered domain is exactly meshed at each iteration when it comes to performing shape or topological sensitivity analysis of the considered cost functional (which often requires one or several finite element computations), while we resort to a level-set description of the domain for desc...

Delaunay meshes are used in various applications such as finite element analysis, computer graphics rendering, geometric modeling, and shape analysis. As the applications vary, so do the domains to be meshed. Although meshing of geometric domains with Delaunay simplices have been around for a while, provable techniques to mesh various types of three dimensional domains have been developed only ...

Polyurethane foams have unique properties that make them suitable for a wide range of applications, including cushioning and seat pads. The foam mechanical largely depend on both the parent material cell microstructure. Uniaxial loading experiments, X-ray tomography finite element analysis can be used to investigate relationship between macroscopic microscopic structure. specimens were scanned ...

frictional shear stress is usually determined by utilizing the coefficient of friction or the constant friction factor models. the present study deals with finite element analysis of double cup extrusion process to determine the relationship between constant friction factor (m) and coefficient of friction (µ), since the metal flow in this process is very sensitive to frictional conditions. ther...