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Finite element modeling

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https://www.readbyqxmd.com/read/29166416/limited-effect-of-cement-material-on-stress-distribution-of-a-monolithic-translucent-zirconia-crown-a-three-dimensional-finite-element-analysis
#1
Sebastian Franco-Tabares, Victoria Franke Stenport, Lars Hjalmarsson, Carina B Johansson
PURPOSE: The literature shows that the performance of densely sintered zirconia single crowns seems to be unaffected by the cement material. The purpose of this study was to evaluate the effects of various cement materials on the stress distribution in a monolithic translucent zirconia crown. MATERIALS AND METHODS: A crown-cement-dentin complex was modeled. Six cements were evaluated: zinc phosphate, glass-ionomer, resin-modified glass-ionomer, dual-cure resin, calcium aluminate-based, and a theoretical or conceptual cement with mechanical properties close to those of dentin (ie, monoblock cement)...
November 22, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29165045/determination-of-the-centre-of-resistance-during-en-masse-retraction-combined-with-corticotomy-finite-element-analysis
#2
Tanes Ouejiaraphant, Bancha Samruajbenjakun, Ekachai Chaichanasiri
OBJECTIVE: To determine the effect of corticotomy on the change in the centre of resistance of the six maxillary anterior teeth Materials and methods: Three-dimensional finite element models of the maxillary anterior teeth with and without corticotomy were constructed. Brackets (size 0.022 inch × 0.028 inch) were placed passively on all anterior teeth that were set at the centre of the labial surface in the mesio-distal dimension and 3 mm from the incisal edge to the bracket slot in the vertical direction...
November 22, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/29162854/human-eye-inspired-soft-optoelectronic-device-using-high-density-mos2-graphene-curved-image-sensor-array
#3
Changsoon Choi, Moon Kee Choi, Siyi Liu, Min Sung Kim, Ok Kyu Park, Changkyun Im, Jaemin Kim, Xiaoliang Qin, Gil Ju Lee, Kyoung Won Cho, Myungbin Kim, Eehyung Joh, Jongha Lee, Donghee Son, Seung-Hae Kwon, Noo Li Jeon, Young Min Song, Nanshu Lu, Dae-Hyeong Kim
Soft bioelectronic devices provide new opportunities for next-generation implantable devices owing to their soft mechanical nature that leads to minimal tissue damages and immune responses. However, a soft form of the implantable optoelectronic device for optical sensing and retinal stimulation has not been developed yet because of the bulkiness and rigidity of conventional imaging modules and their composing materials. Here, we describe a high-density and hemispherically curved image sensor array that leverages the atomically thin MoS2-graphene heterostructure and strain-releasing device designs...
November 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/29162607/computational-study-on-the-effect-of-malalignment-of-the-tibial-component-on-the-biomechanics-of-total-knee-arthroplasty-a-finite-element-analysis
#4
D-S Suh, K-T Kang, J Son, O-R Kwon, C Baek, Y-G Koh
OBJECTIVES: Malalignment of the tibial component could influence the long-term survival of a total knee arthroplasty (TKA). The object of this study was to investigate the biomechanical effect of varus and valgus malalignment on the tibial component under stance-phase gait cycle loading conditions. METHODS: Validated finite element models for varus and valgus malalignment by 3° and 5° were developed to evaluate the effect of malalignment on the tibial component in TKA...
November 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/29162241/influence-of-screw-combination-and-nail-materials-in-the-stability-of-anterograde-reamed-intramedullary-nail-in-distal-femoral-fractures
#5
Sergio Gabarre, Jorge Albareda, Luis Gracia, Sergio Puértolas, Elena Ibarz, Antonio Herrera
Intramedullary nailing (IM) is a technique universally accepted to treat femoral diaphyseal fractures. The treatment of fractures located in the distal third remains a controversial issue though. A finite element model of the femur has been developed, analyzing distal fractures with several gap sizes combined with different interlocking combinations of distal screws with one oblique screw proximally to stabilize the intramedullary nail. The mechanical strength of the nail against bending and compression efforts was also studied...
November 2017: Injury
https://www.readbyqxmd.com/read/29162240/influence-of-gap-size-screw-configuration-and-nail-materials-in-the-stability-of-anterograde-reamed-intramedullary-nail-in-femoral-transverse-fractures
#6
Sergio Gabarre, Jorge Albareda, Luis Gracia, Sergio Puértolas, Elena Ibarz, Antonio Herrera
Femoral shaft fractures are among the most severe injuries of the skeleton. They are associated with high morbidity and mortality. The most appropriate treatment depending on the type of fracture and location level should be chosen. A finite element model of the femur has been developed, analyzing various types of fractures in the subtrochanteric and diaphyseal supracondylar area, with several gap sizes, being stabilized with a single combination of screws for the intramedullary nail. The mechanical strength of the nail against bending and compression efforts was studied comparing two materials for the nail: stainless steel and titanium alloy...
November 2017: Injury
https://www.readbyqxmd.com/read/29162228/palatal-implant-surgery-effectiveness-in-treatment-of-obstructive-sleep-apnea-a-numerical-method-with-3d-patient-specific-geometries
#7
Hongliang Liu, Mads Henrik Strand Moxness, Victorien Emile Prot, Bjørn Helge Skallerud
Obstructive sleep apnea (OSA) affects a large percentage of the population and is increasingly recognized as a major global health problem. One surgical procedure for OSA is to implant polyethylene (PET) material into the soft palate, but its efficacy remains to be discussed. In this study, we provide input to this topic based on numerical simulations. Three 3 dimensional (3D) soft palate finite element models including mouth-close and mouth-open cases were created based on three patient-specific computed tomography (CT) images...
November 10, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29161649/magic-angle-spinning-nmr-below-6%C3%A2-k-with-a-computational-fluid-dynamics-analysis-of-fluid-flow-and-temperature-gradients
#8
Erika L Sesti, Nicholas Alaniva, Peter W Rand, Eric J Choi, Brice J Albert, Edward P Saliba, Faith J Scott, Alexander B Barnes
We report magic angle spinning (MAS) up to 8.5 kHz with a sample temperature below 6 K using liquid helium as a variable temperature fluid. Cross polarization (13)C NMR spectra exhibit exquisite sensitivity with a single transient. Remarkably, (1)H saturation recovery experiments show a (1)H T1 of 21 s with MAS below 6 K in the presence of trityl radicals in a glassy matrix. Leveraging the thermal spin polarization available at 4.2 K versus 298 K should result in 71 times higher signal intensity...
November 11, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29160926/electro-mechanical-response-of-a-3d-nerve-bundle-model-to-mechanical-loads-leading-to-axonal-injury
#9
I Cinelli, M Destrade, M Duffy, P McHugh
OBJECTIVE: Traumatic brain injuries and damage are major causes of death and disability. We propose a 3D fully coupled electro-mechanical model of a nerve bundle to investigate the electrophysiological impairments due to trauma at the cellular level. METHODS: The coupling is based on a thermal analogy of the neural electrical activity by using the finite element software Abaqus CAE 6.13-3. The model includes a real-time coupling, modulated threshold for spiking activation and independent alteration of the electrical properties for each 3-layer fibre within a nerve bundle as a function of strain...
November 21, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/29160423/comparison-of-short-segment-monoaxial-and-polyaxial-pedicle-screw-fixation-combined-with-intermediate-screws-in-traumatic-thoracolumbar-fractures-a-finite-element-study-and-clinical-radiographic-review
#10
Hongwei Wang, Yiwen Zhao, Zhongjun Mo, Jianda Han, Yu Chen, Hailong Yu, Qi Wang, Jun Liu, Changqing Li, Yue Zhou, Liangbi Xiang
OBJECTIVES: No studies have compared monoaxial and polyaxial pedicle screws with regard to the von Mises stress of the instrumentation, intradiscal pressures of the adjacent segment and adjacent segment degeneration. METHODS: Short-segment monoaxial/polyaxial pedicle screw fixation techniques were compared using finite element methods, and the redistributed T11-L1 segment range of motion, largest maximal von Mises stress of the instrumentation, and intradiscal pressures of the adjacent segment under displacement loading were evaluated...
October 2017: Clinics
https://www.readbyqxmd.com/read/29160348/distribution-of-stress-on-tmj-disc-induced-by-use-of-chincup-therapy-assessment-by-the-finite-element-method
#11
Flávio Siqueira Calçada, Antônio Sérgio Guimarães, Marcelo Lucchesi Teixeira, Flávio Atsushi Takamatsu
OBJECTIVE: To assess the distribution of stress produced on TMJ disc by chincup therapy, by means of the finite element method. METHODS: a simplified three-dimensional TMJ disc model was developed by using Rhinoceros 3D software, and exported to ANSYS software. A 4.9N load was applied on the inferior surface of the model at inclinations of 30, 40, and 50 degrees to the mandibular plane (GoMe). ANSYS was used to analyze stress distribution on the TMJ disc for the different angulations, by means of finite element method...
September 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/29160155/design-and-manufacturing-ofpatient-specific-orthodonticappliances-by-computer-aided-engineering-techniques
#12
Sandro Barone, Paolo Neri, Alessandro Paoli, Armando Viviano Razionale
Orthodontic treatments are usually performed using fixed brackets or removable oral appliances, which are traditionally made from alginate impressions and wax registrations. Among removable devices, eruption guidance appliances are used for early orthodontic treatments in order to intercept and prevent malocclusion problems. Commercially available eruption guidance appliances, however, are symmetric devices produced using a few standard sizes. For this reason, they are not able to meet all the specific patient's needs since the actual dental anatomies present various geometries and asymmetric conditions...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29159358/optical-manipulation-of-individual-strongly-absorbing-platinum-nanoparticles
#13
Akbar Samadi, Poul Martin Bendix, Lene B Oddershede
Nanostructures with exceptional absorption in the near infrared (NIR) regime are receiving significant attention due to their ability to promote controlled local heating in biological material upon irradiation. Also, such nano-structures have numerous applications in nano-electronics and for bio-exploration. Therefore, significant effort is being put into controlling and understanding plasmonic nanostructures. However, essentially all focus has been on NIR resonant gold nanoparticles and remarkably little attention has been given to nanoparticles of other materials that may have superior properties...
November 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/29154211/quasi-static-and-dynamic-motions-of-the-columellar-footplate-in-ostrich-struthio-camelus-measured-ex%C3%A2-vivo
#14
Pieter G G Muyshondt, Raf Claes, Peter Aerts, Joris J J Dirckx
The nature of the movement of the columellar footplate (CFP) in birds is still a matter of ongoing debate. Some sources claim that rocking motion is dominant, while others propose a largely piston-like motion. In this study, motions of the CFP are experimentally investigated in the ostrich using a post-mortem approach. For quasi-static loads, micro-CT scans of ostrich heads were made under positive and negative middle-ear pressures of 1 kPa. For dynamic loads, laser Doppler vibrometry was used to measure the velocity on multiple locations of the CFP as a function of excitation frequency from 0...
November 9, 2017: Hearing Research
https://www.readbyqxmd.com/read/29154046/simulation-of-guided-wave-ultrasound-propagation-in-composite-laminates-benchmark-comparisons-of-numerical-codes-and-experiment
#15
Cara A C Leckey, Kevin R Wheeler, Vasyl N Hafiychuk, Halyna Hafiychuk, Doğan A Timuçin
Ultrasonic wave methods constitute the leading physical mechanism for nondestructive evaluation (NDE) and structural health monitoring (SHM) of solid composite materials, such as carbon fiber reinforced polymer (CFRP) laminates. Computational models of ultrasonic wave excitation, propagation, and scattering in CFRP composites can be extremely valuable in designing practicable NDE and SHM hardware, software, and methodologies that accomplish the desired accuracy, reliability, efficiency, and coverage. The development and application of ultrasonic simulation approaches for composite materials is an active area of research in the field of NDE...
November 4, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29153706/load-sharing-in-the-lumbosacral-spine-in-neutral-standing-flexed-postures-a-combined-finite-element-and-inverse-static-study
#16
Tao Liu, Kinda Khalaf, Sadegh Naserkhaki, Marwan El-Rich
Understanding load-sharing in the spine during in-vivo conditions is critical for better spinal implant design and testing. Previous studies of load-sharing that considered actual spinal geometry applied compressive follower load, with or without moment, to simulate muscle forces. Other studies used musculoskeletal models, which include muscle forces, but model the discs by simple beams or spherical joints and ignore the articular facet joints. This study investigated load-sharing in neutral standing and flexed postures using a detailed Finite Element (FE) model of the ligamentous lumbosacral spine, where muscle forces, gravity loads and intra-abdominal pressure, as predicted by a musculoskeletal model of the upper body, are input into the FE model...
November 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29152021/forging-property-processing-map-and-mesoscale-microstructural-evolution-modeling-of-a-ti-17-alloy-with-a-lamellar-%C3%AE-%C3%AE-starting-microstructure
#17
Hiroaki Matsumoto, Daiki Naito, Kento Miyoshi, Kenta Yamanaka, Akihiko Chiba, Yoko Yamabe-Mitarai
This work identifies microstructural conversion mechanisms during hot deformation (at temperatures ranging from 750 °C to 1050 °C and strain rates ranging from 10(-3) s(-1) to 1 s(-1)) of a Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17) alloy with a lamellar starting microstructure and establishes constitutive formulae for predicting the microstructural evolution using finite-element analysis. In the α phase, lamellae kinking is the dominant mode in the higher strain rate region and dynamic globularization frequently occurs at higher temperatures...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/29150765/finite-element-design-optimization-of-a-hyaluronic-acid-based-hydrogel-drug-delivery-device-for-improved-retention
#18
Jourdan Colter, Barbara Wirostko, Brittany Coats
Drug-loaded hydrogel devices are emerging as an effective means of localized and sustained drug delivery for the treatment of corneal conditions and injuries. One such device uses a novel, thiolated crosslinked carboxymethylated, hyaluronic acid-based hydrogel (CMHA-S) film to deliver drug to the ocular surface upon placement into the inferior fornix of the eye. While proven to be very safe and effective, the CMHA-S film tends to dislodge in the highly-lubricated ocular environment, thereby reducing drug delivery efficiency and drug efficacy...
November 17, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29150134/stress-generation-in-mandibular-anterior-teeth-restored-with-different-types-of-post-and-core-at-various-levels-of-ferrule
#19
Anatolii Savychuk, Marianthi Manda, Christos Galanis, Christofer Provatidis, Petros Koidis
STATEMENT OF PROBLEM: Pertinent evidence regarding the mechanical integrity of mandibular anterior teeth restored with a post-and-core is limited. PURPOSE: The purpose of this finite element analysis study was to compare the impact of the post type (glass fiber post-and-resin core or cast post-and-core) along with the ferrule effect on the stress fields generated in endodontically treated mandibular lateral incisors and canines. MATERIAL AND METHODS: Three-dimensional models of the segmented mandible were developed...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29148579/a-step-by-step-review-on-patient-specific-biomechanical-finite-element-models-for-breast-mri-to-x-ray-mammography-registration
#20
REVIEW
Eloy García, Yago Diez, Oliver Diaz, Xavier Lladó, Robert Martí, Joan Martí, Arnau Oliver
Breast magnetic resonance imaging (MRI) and X-ray mammography are two image modalities widely used for the early detection and diagnosis of breast diseases in women. The combination of these modalities leads to a more accurate diagnosis and treatment of breast diseases. The aim of this paper is to review the registration between breast MRI and X-ray mammographic images using patient-specific finite element-based biomechanical models. Specifically, a biomechanical model is obtained from the patient's MRI volume and is subsequently used to mimic the mammographic acquisition...
November 17, 2017: Medical Physics
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