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Finite elements analysis

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https://www.readbyqxmd.com/read/29334509/comparison-of-stress-and-strain-distribution-around-splinted-and-nonsplinted-6-mm-short-implants-in-posterior-mandible-a-finite-element-analysis-study
#1
Mansour Meimandi, Mohammad Reza Talebi Ardakani, Reza Amid, Amir Mahmoudi Motlagh, Shahrzad Beheshti
PURPOSE: This study was designed to compare the biomechanical performance of splinted and nonsplinted short implants, in the posterior mandible, using finite element analysis. MATERIALS AND METHODS: Three-dimensional models of short implants with 2 different diameters (4 × 6 mm or 5 × 6 mm) were scanned, and CATIA (R21) was used to simulate the model of an edentulous lower jaw. Experimental groups were designed as follows: (1) D4L6-splinted (three 4 × 6-mm splinted implants), (2) D4L6-nonsplinted, (3) D5L6-splinted, and (4) D5L6-nonsplinted...
January 12, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29334482/carbon-nanotubes-within-polymer-matrix-can-synergistically-enhance-mechanical-energy-dissipation
#2
Taimoor Ashraf Ashraf, Meelad Ranaiefar, Sumit Khatri, Jamshid Kavosi, Frank Gardea, Bryan Glaz, Mohammad Naraghi
Safe operation and health of structures relies on their ability to effectively dissipate undesired vibrations, which could otherwise significantly reduce the life-time of a structure due to fatigue loads or large deformations. To address this issue, nanoscale fillers, such as carbon nanotubes (CNTs), have been utilized to dissipate mechanical energy in polymer-based nanocomposites through filler-matrix interfacial friction by benefitting from their large interface area with the matrix. In this manuscript, for the first time, we experimentally investigate the effect of CNT alignment with respect to reach other and their orientation with respect to the loading direction on vibrational damping in nanocomposites...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29328326/quadrupole-mode-plasmon-resonance-enabled-subwavelength-metal-dielectric-grating-optical-reflection-filters
#3
Ziyi Wang, Rongjun Zhang, Junpeng Guo
A metal-dielectric subwavelength grating structure was investigated for making single-peak narrow linewidth optical reflection filters in the near-infrared region. The subwavelength grating filter structure consists of a one-dimensional periodic array of metal (gold) and dielectric (Al2O3) elements on a dielectric substrate. Optimized reflection filters have a single reflection peak with ~10 nm linewidth in the infrared region over a wide spectral band. Finite-difference time-domain (FDTD) simulations and multipole analysis show that the narrow linewidth reflection is due to the coupling of the Rayleigh anomaly wave to the quadrupole plasmon resonance mode of the subwavelength metal-dielectric grating...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328324/temperature-insensitive-optical-fiber-strain-sensor-with-ultra-low-detection-limit-based-on-capillary-taper-temperature-compensation-structure
#4
Changpeng Lang, Yi Liu, Kunjian Cao, Shiliang Qu
An optical fiber strain sensor based on capillary-taper compensation structure was proposed. The theoretical simulation by using the finite element analysis method shows a matching condition between the capillary length and the interference-cavity length to achieve the zero temperature crosstalk. Meanwhile, the strain sensitivity can also be improved greatly at the matching condition. We then set up an insertion controller system with high accuracy to make sure the interference-cavity length can match the capillary length...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328249/broadband-near-infrared-antireflection-coatings-fabricated-by-three-dimensional-direct-laser-writing
#5
Y Li, D B Fullager, E Angelbello, D Childers, G Boreman, T Hofmann
Three-dimensional direct laser writing via two-photon polymerization is used to fabricate anti-reflective structured surfaces (ARSSs) composed of subwavelength conicoid features optimized to operate over a wide bandwidth in the near-infrared range from 3700  cm-1 to 6600  cm-1 (2.7-1.52 μm). Analytic Bruggemann effective medium calculations are used to predict nominal geometric parameters such as the fill factor of the constitutive conicoid features of the anti-reflective structured surfaces (ARSSs) presented here...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29327547/-finite-element-analysis-on-the-effect-of-lateral-wedge-insole-intervention-on-the-contact-characteristics-of-the-subtalar-joint
#6
En-Chang Zhou, Ping Tang, Chuan-Ying Zhu, Shi-Ming Liu
OBJECTIVE: To establish a three-dimensional finite element model of the lower limb bones, and investigate the changes of the contact characteristics of the subtalar joint after using laterally wedge insole intervention. METHODS: Using the reverse modeling technology, the lower limb bones of normal adult volunteers was scanned by CT. Mimics 10.0 and Geomagic Studio 6.0 software were used to reconstruct the 3D morphology of bones and external soft tissue of the feet...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29327379/influence-of-varying-stem-and-metaphyseal-sleeve-size-on-the-primary-stability-of-cementless-revision-tibial-trays-used-to-reconstruct-aori-iia-defects-a-simulation-study
#7
Maged Awadalla, Rami M A Al-Dirini, Dermot O'Rourke, Lucian Bogdan Solomon, Mark Heldreth, Mark Taylor
Traditionally, diaphyseal stems have been utilized to augment the stability of revision total knee replacement (rTKR) implants. More recently metaphyseal augments, such as sleeves, have been introduced to further augment component fixation. The effect of augments such as stems and sleeves have on the primary stability of a rTKR implant is poorly understood, however it has important implications on the complexity, costs and survivorship of the procedure. Finite element analysis was used to investigate the primary stability and strain distribution of various size stems and sleeves used in conjunction with a cementless revision tibial tray...
January 12, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29325812/transcatheter-mitral-valve-replacement-in-mitral-annulus-calcification-the-art-of-computer-simulation
#8
Júlia Karády, Ioannis Ntalas, Bernard Prendergast, Christopher Blauth, Steven Niederer, Pál Maurovich-Horvat, Ronak Rajani
There is considerable interest in transcatheter prosthetic valve treatment for mitral valve disease in high-risk individuals. Although the presence of mitral annular calcium (MAC) may provide an anchoring zone for such devices, results to date have been modest with reported technical failure rates approaching 30% in specialist centers. This in part relates to the risk of left ventricular outflow tract obstruction and device dislodgment but also to the lack of specific imaging guidelines to plan for such procedures...
January 4, 2018: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29325333/-biomechanical-effects-on-adjacent-segments-of-different-growing-rod-fixation-in-early-onset-scoliosis
#9
Y Hai, A X Pan, Y G Li, L Zang, S Yuan
Objective: To analyse the biomechanical effects on adjacent segments of different growing-rod (GR) fixation in early onset scoliosis through a finite element analysis method. Methods: A severe early-onset scoliosis patient was selected and the pre-operation and post-GR-operation (Upper instrumented levels: T(4), T(5). Lower instrumented levels: L(3), L(4)) whole spine 3-dimentional CT scan data were collected to build the finite models. Based on the different models, biomechanical differences on adjacent segments were analysed...
December 26, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29320528/developmental-finite-element-analysis-of-cichlid-pharyngeal-jaws-quantifying-the-generation-of-a-key-innovation
#10
Tim Peterson, Gerd B Müller
Advances in imaging and modeling facilitate the calculation of biomechanical forces in biological specimens. These factors play a significant role during ontogenetic development of cichlid pharyngeal jaws, a key innovation responsible for one of the most prolific species diversifications in recent times. MicroCT imaging of radiopaque-stained vertebrate embryos were used to accurately capture the spatial relationships of the pharyngeal jaw apparatus in two cichlid species (Haplochromis elegans and Amatitlania nigrofasciata) for the purpose of creating a time series of developmental stages using finite element models, which can be used to assess the effects of biomechanical forces present in a system at multiple points of its ontogeny...
2018: PloS One
https://www.readbyqxmd.com/read/29318899/influence-of-transmucosal-height-in-abutments-of-single-and-multiple-implant-supported-prostheses-a-non-linear-three-dimensional-finite-element-analysis
#11
Eduardo Borie, Eduardo Leal, Iara Augusta Orsi, Carlos Salamanca, Fernando José Dias, Benjamin Weber
The aim of this study was to analyze the influence of three different transmucosal heights of the abutments in single and multiple implant-supported prostheses through the finite element method. External hexagon implants, MicroUnit, and EsthetiCone abutments were scanned and placed in an edentulous maxillary model obtained from a tomography database. The simulations were divided into two groups: (1) one implant with 3.75 × 10 mm placed in the upper central incisor, simulating a single implant-supported fixed prosthesis with an EsthetiCone abutment; and (2) two implants with 3...
January 10, 2018: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29314652/evaluation-of-bone-stimulation-by-different-designs-of-microthreaded-implants-in-enhancing-osseointegration-an-in-vivo-animal-study-supported-by-a-numerical-analysis
#12
Sindhu Sudhakar Kumararama, Sunil Mishra, Ramesh Chowdhary
BACKGROUND: An optimal shape of the thread design of the implants is required for equal distribution of stresses to the surrounding bone matrix and for stimulation and promotion of bone remodeling. PURPOSE: The study was construed with the aim of histomorphometric evaluation of bone stimulation generated by different microthread designed implants in enhancing osseointegration, and to assess the pattern of stress dissipation through a two-dimensional finite element analysis...
January 4, 2018: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29311022/three-dimensional-titanium-miniplates-for-fixation-of-subcondylar-mandibular-fractures-comparison-of-five-designs-using-patient-specific-finite-element-analysis
#13
Mhd Hassan Albogha, Yoshihide Mori, Ichiro Takahashi
PURPOSE: The purpose of the current study is to compare the performance of five designs of three-dimensional titanium miniplates (lambda, strut, delta, rhombic and trapezoid) for fixation of subcondylar mandibular fracture. MATERIALS AND METHODS: Three-dimensional models were constructed for the five miniplates with their screws and integrated into a virtually fractured mandible that was derived from a computed tomographic image of living human. Patient-specific finite element models were analyzed to compare the performances of the miniplates...
December 26, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29307048/biomechanical-analysis-of-a-new-lumbar-interspinous-device-with-optimized-topology
#14
Chen-Sheng Chen, Shih-Liang Shih
Interspinous spacers used stand-alone preserve joint movement but provide little protection for diseased segments of the spine. Used as adjuncts with fusion, interspinous spacers offer rigid stability but may accelerate degeneration on adjacent levels. Our new device is intended to balance the stability and preserves motion provided by the implant. A new interspinous spacer was devised according to the results of topology optimization studies. Four finite element (FE) spine models were created that consisted of an intact spine without an implant, implantation of the novel, the device for intervertebral assisted motion (DIAM system), and the Dynesys system...
January 6, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29306080/hybrid-micro-nanostructural-surface-offering-improved-stress-distribution-and-enhanced-osseointegration-properties-of-the-biomedical-titanium-implant
#15
Ping-Jen Hou, Keng-Liang Ou, Chin-Chieh Wang, Chiung-Fang Huang, Muhammad Ruslin, Erwan Sugiatno, Tzu-Sen Yang, Hsin-Hua Chou
OBJECTIVES: The aim of the present study was to investigate the surface characteristic, biomechanical behavior, hemocompatibility, bone tissue response and osseointegration of the optimal micro-arc oxidation surface-treated titanium (MST-Ti) dental implant. MATERIALS AND METHODS: The surface characteristic, biomechanical behavior and hemocompatibility of the MST-Ti dental implant were performed using scanning electron microscope, finite element method, blood dripping and immersion tests...
November 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29305427/patient-specific-medial-unicompartmental-knee-arthroplasty-has-a-greater-protective-effect-on-articular-cartilage-in-the-lateral-compartment-a-finite-element-analysis
#16
K-T Kang, J Son, D-S Suh, S K Kwon, O-R Kwon, Y-G Koh
OBJECTIVES: Patient-specific (PS) implantation surgical technology has been introduced in recent years and a gradual increase in the associated number of surgical cases has been observed. PS technology uses a patient's own geometry in designing a medical device to provide minimal bone resection with improvement in the prosthetic bone coverage. However, whether PS unicompartmental knee arthroplasty (UKA) provides a better biomechanical effect than standard off-the-shelf prostheses for UKA has not yet been determined, and still remains controversial in both biomechanical and clinical fields...
January 2018: Bone & Joint Research
https://www.readbyqxmd.com/read/29304908/incisal-preparation-design-for-ceramic-veneers-a-critical-review
#17
Sy Yin Chai, Vincent Bennani, John M Aarts, Karl Lyons
BACKGROUND: The authors reviewed and identified the evidence for the various incisal preparation designs for ceramic veneers. TYPES OF STUDIES REVIEWED: The authors searched MEDLINE with PubMed and Ovid to identify any articles in the English language related to the topic up through March 2017 using a combination of key words: "porcelain veneer or ceramic veneer or dental veneer or labial veneer" AND "preparation," NOT "composite veneer," NOT "crown," NOT "implant," NOT "fixed partial denture or bridge or denture," NOT "porcelain-fused-to-metal," NOT "marginal gap or fit...
January 2018: Journal of the American Dental Association
https://www.readbyqxmd.com/read/29304428/approach-towards-the-porous-fibrous-structure-of-the-periodontal-ligament-using-micro-computerized-tomography-and-finite-element-analysis
#18
J Ortún-Terrazas, J Cegoñino, U Santana-Penín, U Santana-Mora, A Pérez Del Palomar
The periodontal ligament (PDL) is a porous and fibrous soft tissue situated around the tooth, which plays a key role in the transmission of loads from the tooth to the alveolar bone of the mandible. Although several studies have tried to characterize its mechanical properties, the behaviour of this tissue is not clear yet. In this study, a new simulation methodology based on a material model which considers the contribution of porous and fibrous structure with different material model formulations depending on the effort direction is proposed...
December 28, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29304033/weld-magnification-factor-approach-in-cruciform-joints-considering-post-welding-cooling-medium-and-weld-size
#19
Oscar Araque, Nelson Arzola
The objective of this research is to develop an experimental-theoretical analysis about the influence of the cooling medium and the geometry of the welding bead profile in fatigue life and the associated parameters with structural integrity of welded joints. A welded joint with cruciform geometry is considered using SMAW (Shielded Metal ArcWelding), plates in structural steel ASTM A36 HR of 8 mm of thickness, and E6013 electrode input. A three-dimensional computational model of the cruciform joint was created using the finite element method...
January 5, 2018: Materials
https://www.readbyqxmd.com/read/29302937/stress-analysis-of-transcatheter-aortic-valve-leaflets-under-dynamic-loading-effect-of-reduced-tissue-thickness
#20
Mostafa Abbasi, Ali N Azadani
BACKGROUND: In order to accommodate transcatheter valves to miniaturized catheters, the leaflet thickness must be reduced to a value which is typically less than that of surgical bioprostheses. The study aim was to use finite-element simulations to determine the impact of the thickness reduction on stress and strain distribution. METHODS: A 23 mm transcatheter aortic valve (TAV) was modelled based on the Edwards SAPIEN XT (Edwards Lifesciences, Irvine, CA, USA)...
July 2017: Journal of Heart Valve Disease
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