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https://www.readbyqxmd.com/read/28722309/long-term-outcomes-after-acute-primary-angle-closure-of-caucasian-chronic-angle-closure-glaucoma-cacg-patients
#1
Antonio Maria Fea, Laura Dallorto, Carlo Lavia, Giulia Pignata, Teresa Rolle, Tin Aung
IMPORTANCE: There is a lack of information about long term results of chronic angle closure glaucoma (CACG) following an acute primary angle closure (APAC) in Caucasian patients PURPOSE: To report morphological and functional long-term data of CACG eyes following a monolateral APAC attack and to provide a comparison with their fellow eyes DESIGN: Observational retrospective case series (Clinica Oculistica Universitaria, Ospedale Oftalmico, Turin) PARTICIPANTS: 57 consecutive patients (114 eyes) underwent long term follow-up analysis...
July 19, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28720340/mechanical-strength-and-fracture-point-of-a-dental-implant-under-certification-conditions-a-numerical-approach-by-finite-element-analysis
#2
Guillermo de la Rosa Castolo, Sonia V Guevara Perez, Pierre-Jean Arnoux, Laurent Badih, Franck Bonnet, Michel Behr
STATEMENT OF PROBLEM: Implant prosthodontics provides high-quality outcomes thanks to recent technological developments and certification procedures such as International Organization for Standardization (ISO) standard 14801. However, these certification tests are costly, and the result is highly uncertain as the influence of design variables (materials and structure) is still unknown. The design process could be significantly improved if the influence of design parameters were identified...
July 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28709037/finite-element-analysis-and-clinical-complications-in-mandibular-implant-overdentures-opposing-maxillary-dentures
#3
Tameem Khuder, Norsiah Yunus, Eshamsul Sulaiman, Ali Dabbagh
Denture fracture is a common clinical complication caused by improper material selection, design, or fabrication technique. This study aimed to investigate the effect of two attachment systems on fracture risk of the implant-overdentures (IOD) via finite element analysis (FEA), using the force distributions obtained from patients' occlusal analyses and to compare the obtained results with the clinical complications associated with these attachments. A three-dimensional jaw model comprised of the edentulous bones was constructed...
July 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28706786/role-of-1-5%C3%A2-mm-microplates-in-treatment-of-symphyseal-fracture-of-mandible-a-stress-analysis-based-comparative-study
#4
Syed S Ahmed, Siddharth Bhardwaj, Md Kalim Ansari, Omar Farooq, Abid Ali Khan
AIMS AND OBJECTIVES: To perform comparative finite element analysis (FEA)for 2.0 mm standard miniplate and 1.5 mm microplate in isolated symphyseal mandibular fractures. MATERIAL AND METHOD: Two FE models of mandible were developed and symphyseal fracture was created in both of them. Each fractured model was reduced and fixed using two mini plates and two microplates, respectively according Champ's principle. Stresses thus developed in the plates after application of masticatory load were observed in the models...
May 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28706195/effect-of-nb2o5-doping-on-improving-the-thermo-mechanical-stability-of-sealing-interfaces-for-solid-oxide-fuel-cells
#5
Qi Zhang, Xinhang Du, Shengwei Tan, Dian Tang, Kongfa Chen, Teng Zhang
Nb2O5 is added to a borosilicate sealing system to improve the thermo-mechanical stability of the sealing interface between the glass and Fe-Cr metallic interconnect (Crofer 22APU) in solid oxide fuel cells (SOFCs). The thermo-mechanical stability of the glass/metal interface is evaluated experimentally as well as by using a finite element analysis (FEA) method. The sealing glass doped with 4 mol.% Nb2O5 shows the best thermo-mechanical stability, and the sealing couple of Crofer 22APU/glass/GDC (Gd0.2Ce0...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698113/patient-specific-biomechanical-model-of-hypoplastic-left-heart-to-predict-post-operative-cardio-circulatory-behaviour
#6
Elena Cutrì, Alessio Meoli, Gabriele Dubini, Francesco Migliavacca, Tain-Yen Hsia, Giancarlo Pennati
Hypoplastic left heart syndrome is a complex congenital heart disease characterised by the underdevelopment of the left ventricle normally treated with a three-stage surgical repair. In this study, a multiscale closed-loop cardio-circulatory model is created to reproduce the pre-operative condition of a patient suffering from such pathology and virtual surgery is performed. Firstly, cardio-circulatory parameters are estimated using a fully closed-loop cardio-circulatory lumped parameter model. Secondly, a 3D standalone FEA model is build up to obtain active and passive ventricular characteristics and unloaded reference state...
July 8, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28695842/revealing-correlation-effect-of-co-3d-electrons-in-la-sub-3-sub-co-sub-4-sub-sn-sub-13-sub-and-ce-sub-3-sub-co-sub-4-sub-sn-sub-13-sub-by-infrared-spectroscopy-study
#7
Wenjing Ban, Jian Lin Luo, Nan Lin Wang
We report resistivity, specific heat and optical spectroscopy measurements on single crystal samples of La3Co4Sn13and Ce3Co4Sn13. We observed clear temperature-induced spectral weight suppression below 4000 cm-1for both compounds in conductivity spectra σ1(ω), indicating the progressive formation of gap-like fea- tures with decreasing temperature. The suppressed spectral weight transfers mostly to the higher energy region. The observation reflects the presence of correlation effect in the compounds...
July 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28690710/the-role-of-simulation-in-the-design-of-a-semi-enclosed-tubular-embolus-retrieval
#8
Xuelian Gu, Yongxiang Qi, Arthur Erdman, Zhonghua Li
A numerical analysis of a semi-enclosed tubular mechanical embolus retrieval device (MERD) for the treatment of acute ischemic stroke (AIS) is presented. In this research, the finite element analysis (FEA) methodology is used to evaluate mechanical performance and provide suggestions for optimizing the geometric design. A MERD fabricated from nickel-titanium alloy (Nitinol) tubing is simulated and analyzed under complex in vivo loading conditions involving shape-setting, crimping, deployment, and embolus retrieval...
June 2017: Journal of Medical Devices
https://www.readbyqxmd.com/read/28675043/effect-of-round-curvature-of-anterior-implant-supported-zirconia-frameworks-finite-element-analysis-and-in-vitro-study-using-digital-image-correlation
#9
Ana Messias, Maria Augusta Neto, Ana Martins Amaro, Pedro Nicolau, Luis Manuel Roseiro
Two groups of 4-unit zirconia frameworks were produced by CAD/CAM to simulate the restoration of an anterior edentulous gap supported by 2 implant-abutment assemblies. Group 1 comprised straight configuration frameworks and group 2 consisted of arched frameworks. Specimens were made with the same connector cross-section area and were cemented and submitted to static loads. Displacements were captured with two high-speed photographic cameras and analysed with video correlation system. Frameworks and the implant-abutment assembly were scanned and converted to 3DCAD objects by reverse engineering process...
July 4, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28669751/finite-element-analysis-to-investigate-variability-of-mr-elastography-in-the-human-thigh
#10
L Hollis, E Barnhill, M Perrins, P Kennedy, N Conlisk, C Brown, P R Hoskins, P Pankaj, N Roberts
PURPOSE: To develop finite element analysis (FEA) of magnetic resonance elastography (MRE) in the human thigh and investigate inter-individual variability of measurement of muscle mechanical properties. METHODS: Segmentation was performed on MRI datasets of the human thigh from 5 individuals and FEA models consisting of 12 muscles and surrounding tissue created. The same material properties were applied to each tissue type and a previously developed transient FEA method of simulating MRE using Abaqus was performed at 4 frequencies...
June 29, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28667293/multiscale-studies-on-the-nonlinear-vibration-of-delaminated-composite-laminates-global-vibration-mode-with-micro-buckles-on-the-interfaces
#11
Jianghong Xue, Fei Xia, Jun Ye, Jianwen Zhang, Shuhua Chen, Ying Xiong, Zuyuan Tan, Renhuai Liu, Hong Yuan
This paper presents a multiscale approach to study the nonlinear vibration of fiber reinforced composite laminates containing an embedded, through-width delamination dividing the laminate into four sub-laminates. The equations of motion are established from macroscopic nonlinear mechanics for plates and shells and micro-mechanics of composite material to allow for the influences of large amplitude, membrane stretching in the neutral plane, and the interactions of the sublaminates. Analytical solutions obtained in this paper reveal that the interaction penalty at the interfaces plays a coupling effect between sublaminates, which eventually alters the vibration characters of the four-sublaminate lamina in macroscopic and microscopic mechanism...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28646185/the-relation-between-residual-stress-interfacial-structure-and-the-joint-property-in-the-sio2f-sio2-nb-joints
#12
Qiang Ma, Zhuo Ran Li, Lai Shan Yang, Jing Huang Lin, Jin Ba, Ze Yu Wang, Jun Lei Qi, Ji Cai Feng
In order to achieve a high-quality joint between SiO2f/SiO2 and metals, it is necessary to address the poor wettability of SiO2f/SiO2 and the high residual stress in SiO2f/SiO2-Nb joint. Here, we simultaneously realize good wettability and low residual stress in SiO2f/SiO2-Nb joint by combined method of HF etching treatment and Finite Element Analysis (FEA). After etching treatment, the wettability of E-SiO2f/SiO2 was improved, and the residual stress in the joint was decreased. In order to better control the quality of joints, efforts were made to understand the relationship between surface structure of E-SiO2f/SiO2 and residual stress in joint using FEA...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645850/biomechanical-analysis-using-fea-and-experiments-of-a-standard-plate-method-versus-three-cable-methods-for-fixing-acetabular-fractures-with-simultaneous-tha
#13
Mina S R Aziz, Omar Dessouki, Saeid Samiezadeh, Habiba Bougherara, Emil H Schemitsch, Radovan Zdero
Acetabular fractures potentially account for up to half of all pelvic fractures, while pelvic fractures potentially account for over one-tenth of all human bone fractures. This is the first biomechanical study to assess acetabular fracture fixation using plates versus cables in the presence of a total hip arthroplasty, as done for the elderly. In Phase 1, finite element (FE) models compared a standard plate method versus 3 cable methods for repairing an acetabular fracture (type: anterior column plus posterior hemi-transverse) subjected to a physiological-type compressive load of 2207N representing 3 x body weight for a 75kg person during walking...
August 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28623521/exploring-for-the-optimal-structural-design-for-the-3d-printing-technology-for-cranial-reconstruction-a-biomechanical-and-histological-study-comparison-of-solid-vs-porous-structure
#14
Jun Young Lim, Namhyun Kim, Jong-Chul Park, Sun K Yoo, Dong Ah Shin, Kyu-Won Shim
PURPOSE: Cranioplasty for recovering skull defects carries the risk for a number of complications. Various materials are used, including autologous bone graft, metallic materials, and non-metallic materials, each of which has advantages and disadvantages. If the use of autologous bone is not feasible, those artificial materials also have constraints in the case of complex anatomy and/or irregular defects. MATERIAL AND METHODS: This study used metal 3D-printing technology to overcome these existing drawbacks and analyze the clinical and mechanical performance requirements...
June 16, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28621279/comparative-evaluation-of-stress-developed-on-rotary-retreatment-instruments-during-retrieval-of-gutta-percha
#15
Dhanasekaran Sihivahanan, T Vinay Kumar Reddy, Anchu Rachel Thomas, Natarajan Senthilnathan, Murali Sivakumar, Sushmita Shivanna
AIM: The aim of the study is to compare the maximum stress distribution on the rotary retreatment instruments within the root canal at cervical, middle, and the apical one-third during retreatment of gutta-percha. MATERIALS AND METHODS: A human mandibular premolar was scanned, and three-dimensional geometry of the root was reconstructed using finite element analysis (FEA) software package (ANSYS). The basic model was kept unchanged; tooth models were created using the same dimensions and divided into two groups as follows: Group I: ProTaper Universal retreatment system and group II: Mtwo rotary retreatment system...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28615109/study-of-guided-wave-propagation-on-a-plate-between-two-solid-bodies-with-imperfect-contact-conditions
#16
A J Balvantín, J A Diosdado-De-la-Peña, P A Limon-Leyva, E Hernández-Rodríguez
In this work, fundamental symmetric Lamb wave S0 mode is characterized in terms of its velocity variation as function of the interfacial conditions between solid bodies in contact. Imperfect contact conditions are numerically and experimentally determined by using ultrasonic Lamb wave propagation parameters. For the study, an experimental system was used, formed by two solid aluminum rods (25.4mm in diameter) axially loading a thin aluminum plate to control contact interfacial stiffness. The axially applied load on the aluminum plate was varied from 0MPa to 10MPa...
June 3, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28602314/dynamic-equivalence-of-ultrasonic-stress-wave-propagation-in-solids
#17
Medhat Awad El-Hadek
Ultrasonic stress waves, generated during the dynamic impact on structures, were studied. A benchmark for the finite element analysis (FEA) was made to define the optimum geometrical factors, which were represented as, mesh distribution, analysis time, ultrasonic wave properties, element type, and shape to capture the dynamic phenomena compared to the theoretical exact solution. Comparison of three different dimensional finite element models was performed depending on the applied impact forces, the element size, and the structural geometry...
June 3, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28584518/an-investigation-into-a-gear-based-knee-joint-designed-for-lower-limb-prosthesis
#18
M S H Bhuiyan, I A Choudhury, M Dahari, Y Nukman, S Z Dawal
A gear-based knee joint is designed to improve the performance of mechanical-type above-knee prostheses. The gear set with the help of some bracing, and bracket arrangement, is used to enable the prosthesis to follow the residual limb movement. The motion analysis and finite-element analysis (FEA) of knee joint components are carried out to assess the feasibility of the design. The maximum stress of 29.74 MPa and maximum strain of 2.393e-004 are obtained in the gear, whereas the maximum displacement of 7...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28578345/calcium-channel-opening-rather-than-the-release-of-atp-causes-the-apoptosis-of-osteoblasts-induced-by-overloaded-mechanical-stimulation
#19
Lu Liu, Hui Li, Ying Cui, Ruixin Li, Fan Meng, Zi Ye, Xizheng Zhang
BACKGROUND: Stress fracture is one of the most common overuse injuries in athletes. Overloaded mechanical stimulation is an important factor affecting stress fractures, but the mechanism is unclear. METHODS: MC3T3-E1 cells and a polycaprolactone (PCL) scaffold were co-cultured, and finite element analysis (FEA) was used to analyze the load-carrying capability. Cell proliferation was investigated with CCK-8 assays. An alkaline phosphatase (AKP) activity assay was used to evaluate cell differentiation...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28558326/preparation-characterization-and-thermal-risk-evaluation-of-dihydroxylammonium-5-5-bistetrazole-1-1-diolate-based-polymer-bonded-explosive
#20
Hu Niu, Shusen Chen, Qinghai Shu, Lijie Li, Shaohua Jin
Dihydroxylammonium 5,5'- bistetrazole-1,1'-diolate (TKX-50) was used to prepare TKX-50-based polymer bonded explosive (PBX) for the first time in this study. The thermal stabilities and the kinetic parameters of TKX-50 and TKX-50-based PBX were compared via Differential Scanning Calorimetry (DSC), Thermal Gravity-Differential Thermal Gravity (TG-DTG) and Accelerating Rate Calorimeter (ARC). Furthermore, in order to know about their thermal safeties comprehensively, an advanced thermal analysis program based on Friedman method was employed to calculate the thermal safety parameters for TKX-50 and its PBX...
May 22, 2017: Journal of Hazardous Materials
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