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Finite element analysis

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https://www.readbyqxmd.com/read/29043866/three-dimensional-finite-element-analysis-of-glass-fiber-and-cast-metal-posts-with-different-alloys-for-reconstruction-of-teeth-without-ferrule
#1
Fellippo Ramos Verri, Marlice Hayumi Theles Okumura, Cleidiel Aparecido Araujo Lemos, Daniel Augusto de Faria Almeida, Victor Eduardo de Souza Batista, Ronaldo Silva Cruz, Hiskell Francine Fernandes Oliveira, Eduardo Piza Pellizzer
The aim of this study was to evaluate different materials for restoration of teeth without ferrule by three-dimensional (3D) finite element analysis (FEA). Five models simulating the maxillary central incisor and surrounding bone were simulated according to the type of post: glass fibre post (GFP) or cast metal post (CMP) with different alloys such as gold (Au), silver-palladium (AgPd), copper-aluminum (CuAl) and nickel-chromium (NiCr). Models were designed using Invesalius and Rhinoceros. FEAs were made using FEMAP and NeiNastran, with an applied axial force of 100 N and oblique occlusal load at 45°...
October 18, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29043107/the-intervals-method-a-new-approach-to-analyse-finite-element-outputs-using-multivariate-statistics
#2
Jordi Marcé-Nogué, Soledad De Esteban-Trivigno, Thomas A Püschel, Josep Fortuny
BACKGROUND: In this paper, we propose a new method, named the intervals' method, to analyse data from finite element models in a comparative multivariate framework. As a case study, several armadillo mandibles are analysed, showing that the proposed method is useful to distinguish and characterise biomechanical differences related to diet/ecomorphology. METHODS: The intervals' method consists of generating a set of variables, each one defined by an interval of stress values...
2017: PeerJ
https://www.readbyqxmd.com/read/29038943/a-lower-limb-pelvis-finite-element-model-with-3d-active-muscles
#3
Fuhao Mo, Fan Li, Michel Behr, Zhi Xiao, Guanjun Zhang, Xianping Du
A lower limb-pelvis finite element (FE) model with active three-dimensional (3D) muscles was developed in this study for biomechanical analysis of human body. The model geometry was mainly reconstructed from a male volunteer close to the anthropometry of a 50th percentile Chinese male. Tissue materials and structural features were established based on the literature and new implemented experimental tests. In particular, the muscle was modeled with a combination of truss and hexahedral elements to define its passive and active properties as well as to follow the detailed anatomy structure...
October 16, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29038836/automated-dxa-based-finite-element-analysis-for-hip-fracture-risk-stratification-a-cross-sectional-study
#4
S Yang, W D Leslie, Y Luo, A L Goertzen, S Ahmed, L M Ward, I Delubac, L M Lix
Fracture risk indices (FRIs) generated from DXA-based finite element analysis were associated with hip fracture independent of FRAX score computed with femoral neck bone mineral density (BMD). Prospective studies are warranted to determine whether FRIs represent an improvement over BMD for predicting incident hip fractures. INTRODUCTION: The study aims to examine the association between prior hip fracture and FRIs derived from automated finite element analysis (FEA) of DXA hip scans. Femoral neck, intertrochanteric, and subtrochanteric FRIs were calculated as the von Mises stress induced by a sideways fall divided by the bone yield stress over the specified region of interest (ROI)...
October 6, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/29037846/altered-bone-density-and-stress-distribution-patterns-in-long-standing-cubitus-varus-deformity-and-their-effect-during-early-osteoarthritis-of-the-elbow
#5
Satoshi Miyamura, Kunihiro Oka, Shingo Abe, Atsuo Shigi, Hiroyuki Tanaka, Kazuomi Sugamoto, Hideki Yoshikawa, Tsuyoshi Murase
OBJECTIVE: To quantify the bone density and stress distribution patterns in long-standing cubitus varus and clarify the effects of the deformity on bone density. DESIGN: We created three-dimensional computed tomography elbow models from 21 patients with long-standing cubitus varus deformities without advanced osteoarthritis (OA) and assessed the deformity by superimposing the affected humerus onto a mirror-image of the contralateral normal. Elbows were divided into 13 regions before measuring the bone density of each region and comparing the percentage of high-density volume (%HDV) between affected and normal sides...
October 13, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29037463/in-vivo-bone-strain-and-finite-element-modeling-of-a-rhesus-macaque-mandible-during-mastication
#6
Olga Panagiotopoulou, José Iriarte-Diaz, Simon Wilshin, Paul C Dechow, Andrea B Taylor, Hyab Mehari Abraha, Sharifah F Aljunid, Callum F Ross
Finite element analysis (FEA) is a commonly used tool in musculoskeletal biomechanics and vertebrate paleontology. 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...
September 1, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/29037404/do-the-ornamented-osteoderms-influence-the-heat-conduction-through-the-skin-a-finite-element-analysis-in-crocodylomorpha
#7
F Clarac, F Goussard, L Teresi, Vde Buffrénil, V Sansalone
In order to assess the implication of the crocodylomorph ornamented osteoderms on the skin conduction during basking, we have performed three dimensional modeling and finite element analyses on a sample which includes both extant dry bones and well-preserved fossils tracing back to the Early Jurassic. In purpose to reveal the possible implication of the superficial ornamentation on the osteoderm heat conduction, we repeated the simulation on an equivalent set of smoothed 3D-modeled osteoderms. The comparison of the results evidenced that the presence of the apical sculpture has no significant impact on the osteoderm global conduction...
October 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29032976/the-application-of-3d-printed-transparent-facemask-for-facial-scar-management-and-its-biomechanical-rationale
#8
Yating Wei, Yan Wang, Ming Zhang, Gang Yan, Shixue Wu, Wenjun Liu, Gang Ji, Cecilia W P Li-Tsang
INTRODUCTION: Deep facial burns leave conspicuous scar to the patients and affect their quality of life. Transparent facemask has been adopted for the prevention and treatment of facial hypertrophic scars for decades. Recently, with the advancement of 3D printing, the transparent facemask could facilitate the fitting of the facial contour. However, the effectiveness of the device and its biomechanical characteristics on pressure management of hypertrophic scar would need more objective evaluation...
October 9, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/29032714/fusion-of-optical-coherence-tomography-and-angiography-for-numerical-simulation-of-hemodynamics-in-bioresorbable-stented-coronary-artery-based-on-patient-specific-model
#9
Chenxi Huang, Yuanhang Zhou, Xiaoxin Mao, Jianhua Tong, Lei Zhang, Fei Chen, Yongtao Hao
Three-dimensional simulations of coronary artery using finite element analysis are considered as effective means to understand the biomechanical properties after the stent was deployed. Bioresorbable vascular scaffolds are new-generation stents used by people. Intravascular optical coherence tomography is an emerging technique for detecting struts. The common 3 D reconstruction methods are using Intravascular Ultrasound (IVUS) or angiographies. However, it loses the details about geometry model. Fusing of optical coherence tomography and angiography to reconstruct the bioresorbable stented coronary artery based on patient-specific mode is an innovative method to reconstruct the high fidelity geometry...
October 16, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/29031524/analysis-of-pelvic-strain-in-different-gait-configurations-in-a-validated-cohort-of-computed-tomography-based-finite-element-models
#10
Zoryana Salo, Maarten Beek, David Wright, Asmaa Maloul, Cari Marisa Whyne
The pelvis functions to transmit upper body loads to the lower limbs and is critical in human locomotion. Semi-automated, landmark-based finite element (FE) morphing and mapping techniques eliminate the need for segmentation and have shown to accelerate the generation of multiple specimen-specific pelvic FE models to enable the study of pelvic mechanical behaviour. The purpose of this research was to produce an experimentally validated cohort of specimen-specific FE models of the human pelvis and to use this cohort to analyze pelvic strain patterns during gait...
September 19, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29031277/resonant-convergent-second-order-nonlinear-response-functions-at-the-levels-of-hartree-fock-and-kohn-sham-density-functional-theory
#11
Tobias Fahleson, Patrick Norman
The second-order nonlinear (or cubic) response function is derived from the Ehrenfest theorem with inclusion made of the finite lifetimes of the excited states, representing the extension of the derivation of the quadratic response function in the same framework [P. Norman et al., J. Chem. Phys. 123, 194103 (2005)]. The resulting damped response functions are physically sound and converging also in near-resonance and resonance regions of the spectrum. Being an accurate approximation for small complex frequencies (defined as the sum of an optical frequency and an imaginary damping parameter), the polynomial expansion of the complex cubic response function in terms of the said frequencies is presented and used to validate the program implementation...
October 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29027102/current-status-of-the-female-athlete-triad-update-and-future-directions
#12
REVIEW
Mary Jane De Souza, Kristen J Koltun, Clara V Etter, Emily A Southmayd
PURPOSE OF REVIEW: This review provides an update on the primary clinical sequelae of the Female Athlete Triad. RECENT FINDINGS: Scientific advancements have contributed to improve understanding of Triad-related conditions, including leptin's role as a potential neuroendocrine link between energy status and reproductive function. Use of finite element analysis of HRpQCT imaging has provided a more accurate assessment of bone geometry and bone strength and may be clinically relevant...
October 11, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/29027022/an-eftd-vp-framework-for-efficiently-generating-patient-specific-anatomically-detailed-facial-soft-tissue-fe-mesh-for-craniomaxillofacial-surgery-simulation
#13
Xiaoyan Zhang, Daeseung Kim, Shunyao Shen, Peng Yuan, Siting Liu, Zhen Tang, Guangming Zhang, Xiaobo Zhou, Jaime Gateno, Michael A K Liebschner, James J Xia
Accurate surgical planning and prediction of craniomaxillofacial surgery outcome requires simulation of soft tissue changes following osteotomy. This can only be achieved by using an anatomically detailed facial soft tissue model. The current state-of-the-art of model generation is not appropriate to clinical applications due to the time-intensive nature of manual segmentation and volumetric mesh generation. The conventional patient-specific finite element (FE) mesh generation methods are to deform a template FE mesh to match the shape of a patient based on registration...
October 12, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29024249/bone-strength-in-girls-and-boys-following-a-distal-radius-fracture-a-2-year-hr-pqct-double-cohort-study
#14
Heather M Macdonald, Mikko Määttä, Leigh Gabel, Kishore Mulpuri, Heather A McKay
PURPOSE: We recently reported impaired bone strength in girls with low- to moderate-energy distal radius fractures (Fx) compared with girls with no history of forearm fractures (Non-Fx). We aimed to determine whether bone strength deficits observed at baseline were still present after two years. METHODS: We assessed bone strength, microarchitecture and BMD of the non-fractured (Fx) and non-dominant (Non-Fx) distal radius (7% site) at baseline, 12- and 24-months using high-resolution pQCT (Scanco Medical) in 104 girls (11...
October 12, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29023250/biomechanical-determinants-of-right-ventricular-failure-in-pulmonary-hypertension
#15
Francesco Scardulla, Diego Bellavia, Patrizio Vitulo, Giuseppe Romano, Chiara Mina, Giovanni Gentile, Francesco Clemenza, Salvatore Pasta
Pulmonary hypertension (PH) is a disease characterized by progressive adverse remodeling of the distal pulmonary arteries, resulting in elevated pulmonary vascular resistance and load pressure on the right ventricle (RV), ultimately leading to RV failure. Invasive hemodynamic testing is the gold standard for diagnosing PH and guiding patient therapy. We hypothesized that lumped-parameter and biventricular finite-element (FE) modeling may lead to noninvasive predictions of both PH-related hemodynamic and biomechanical parameters that induce PH...
October 18, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29023236/end-to-end-workflow-for-finite-element-analysis-of-tumor-treating-fields-in-glioblastomas
#16
Joshua J Timmons, Edwin Lok, Pyay San, Kevin Bui, Eric T Wong
Tumor Treating Fields (TTFields) therapy is an approved modality of treatment for glioblastoma. Patient anatomy-based finite element analysis (FEA) has the potential to reveal not only how these fields affect tumor control but also how to improve efficacy. While the automated tools for segmentation speed up the generation of FEA models, multi-step manual corrections are required, including removal of disconnected voxels, incorporation of unsegmented structures and the addition of 36 electrodes plus gel layers matching the TTFields transducers...
October 12, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28994795/a-method-to-estimate-cadaveric-femur-cortical-strains-during-fracture-testing-using-digital-image-correlation
#17
Timothy Rossman, Susheil Uthamaraj, Asghar Rezaei, Sean McEligot, Hugo Giambini, Iwona Jasiuk, Michael J Yaszemski, Lichun Lu, Dan Dragomir-Daescu
This protocol describes the method using digital image correlation to estimate cortical strain from high speed video images of the cadaveric femoral surface obtained from mechanical testing. This optical method requires a texture of many contrasting fiduciary marks on a solid white background for accurate tracking of surface deformation as loading is applied to the specimen. Immediately prior to testing, the surface of interest in the camera view is painted with a water-based white primer and allowed to dry for several minutes...
September 14, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28994395/in-situ-biasing-and-off-axis-electron-holography-of-a-zno-nanowire
#18
Martien den Hertog, Fabrice Donatini, Robert McLeod, Eva Monroy, Corinne Sartel, Vincent Sallet, Julien Pernot
Quantitative characterization of electrically active dopants and surface charges in nano-objects is challenging, since most characterization techniques using electrons, ions or field ionization effects study the chemical presence of dopants, which are not necessarily electrically active. We perform cathodoluminescence and voltage contrast experiments on a contacted and biased ZnO nanowire with a Schottky contact and measure the depletion length as a function of reverse bias. We compare these results with state-of-the-art off-axis electron holography in combination with electrical in-situ biasing on the same nanowire...
October 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28986617/risk-of-fracture-of-the-acromion-depends-on-size-and-orientation-of-acromial-bone-tunnels-when-performing-acromioclavicular-reconstruction
#19
Felix Dyrna, Celso Cruz Timm de Oliveira, Michael Nowak, Andreas Voss, Elifho Obopilwe, Sepp Braun, Leo Pauzenberger, Andreas B Imhoff, Augustus D Mazzocca, Knut Beitzel
PURPOSE: Current techniques for anatomic repair of the dislocated acromioclavicular (AC) joint aim on reconstruction of the AC ligaments and utilize tunnels drilled through the acromion . This improves the stability of the reconstruction but might also increase the risk of fractures at the acromion. The purpose of this study was to evaluate the fracture risk for the acromion after transacromial tunnel placement for anatomic AC joint stabilization procedure. It was hypothesized that the risk of fracture of the acromion is correlated to size and orientation of bone tunnels commonly used for anatomic AC joint reconstruction...
October 6, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28986074/finite-element-analysis-of-the-stability-of-ao-ota-43-c1-type-distal-tibial-fractures-treated-with-distal-tibia-medial-anatomic-plate-versus-anterolateral-anatomic-plate
#20
O Fuad Oken, A Ozgur Yildirim, Mehmet Asilturk
BACKGROUND: The treatment of a pilon fracture type is possible from a medial, an anterolateral approach or both medial and lateral. The aim of study was compare the stability of two different plate fixation of a tibia pilon AO-43C1 type fractures. MATERIAL AND METHODS: In this study, three-dimensional finite element stress analysis was applied using isotropic materials and static linear analysis. Loading of 400 N force was applied to the model of a patient fixed in a standing position...
October 3, 2017: Acta Orthopaedica et Traumatologica Turcica
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