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Journal of the Mechanical Behavior of Biomedical Materials

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https://www.readbyqxmd.com/read/28103515/strong-synergistic-effects-in-pla-pcl-blends-impact-of-pla-matrix-viscosity
#1
Aleksandra Ostafinska, Ivan Fortelný, Jiří Hodan, Sabina Krejčíková, Martina Nevoralová, Jana Kredatusová, Zdeněk Kruliš, Jiří Kotek, Miroslav Šlouf
Blends of two biodegradable polymers, poly(lactic acid) (PLA) and poly(ϵ-caprolactone) (PCL), with strong synergistic improvement in mechanical performance were prepared by melt-mixing using the optimized composition (80/20) and the optimized preparation procedure (a melt-mixing followed by a compression molding) according to our previous study. Three different PLA polymers were employed, whose viscosity decreased in the following order: PLC ≈ PLA1 > PLA2 > PLA3. The blends with the highest viscosity matrix (PLA1/PCL) exhibited the smallest PCL particles (d∼0...
January 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28103514/pva-matches-human-liver-in-needle-tissue-interaction
#2
Tonke L de Jong, Loes H Pluymen, Dennis J van Gerwen, Gert-Jan Kleinrensink, Jenny Dankelman, John J van den Dobbelsteen
Medical phantoms can be used to study needle-tissue interaction and to train medical residents. The purpose of this research is to study the suitability of polyvinyl alcohol (PVA) as a liver tissue mimicking material in terms of needle-tissue interaction. Insertions into ex-vivo human livers were used for reference. Six PVA samples were created by varying the mass percentage of PVA to water (4m% and 7m%) and the number of freeze-thaw cycles (1, 2 and 3 cycles, 16hours of freezing at -19°C, 8hours of thawing)...
January 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28088693/reinforcement-of-a-pmma-resin-for-interim-fixed-prostheses-with-silica-nanoparticles
#3
Marianthi Topouzi, Eleana Kontonasaki, Dimitrios Bikiaris, Lambrini Papadopoulou, Konstantinos M Paraskevopoulos, Petros Koidis
PURPOSE: Fractures in long span provisional/interim restorations are a common complication. Adequate fracture toughness is necessary to resist occlusal forces and crack propagation, so these restorations should be constructed with materials of improved mechanical properties. The aim of this study was to investigate the possible reinforcement of neat silica nanoparticles and trietoxyvinylsilane-modified silica nanoparticles in a PMMA resin for fixed interim restorations. MATERIALS AND METHODS: Composite PMMA-Silica nanoparticles powders were mixed with PMMA liquid and compact bar shaped specimens were fabricated according to the British standard BS EN ISO 127337:2005...
January 9, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28089326/mechanical-response-of-common-millet-panicum-miliaceum-seeds-under-quasi-static-compression-experiments-and-modeling
#4
Benjamin P J Hasseldine, Chao Gao, Joseph M Collins, Hyun-Do Jung, Tae-Sik Jang, Juha Song, Yaning Li
The common millet (Panicum miliaceum) seedcoat has a fascinating complex microstructure, with jigsaw puzzle-like epidermis cells articulated via wavy intercellular sutures to form a compact layer to protect the kernel inside. However, little research has been conducted on linking the microstructure details with the overall mechanical response of this interesting biological composite. To this end, an integrated experimental-numerical-analytical investigation was conducted to both characterize the microstructure and ascertain the microscale mechanical properties and to test the overall response of kernels and full seeds under macroscale quasi-static compression...
January 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28086149/shear-waves-elastography-for-assessment-of-human-achilles-tendon-s-biomechanical-properties-an-experimental-study
#5
T X Haen, A Roux, M Soubeyrand, S Laporte
INTRODUCTION: Achilles tendon is the most frequently ruptured tendon, but its optimal treatment is increasingly controversial. The mechanical properties of the healing tendon should be studied further. Shear waves elastography (SWE) measures the shear modulus, which is proven to be correlated to elastic modulus in animal tendons. The aim of our study was to study whether the shear moduli of human cadaveric Achilles tendon, given by SWE, were correlated with the apparent elastic moduli of those tendons given by tensile tests...
January 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28088072/microstructural-mechanical-and-corrosion-characteristics-of-heat-treated-mg-1-2zn-0-5ca-wt-alloy-for-use-as-resorbable-bone-fixation-material
#6
Hamdy Ibrahim, Andrew D Klarner, Behrang Poorganji, David Dean, Alan A Luo, Mohammad Elahinia
Mg-Zn-Ca alloys have grabbed most of the recent attention in research attempting to develop an Mg alloy for bone fixation devices due to their superior biocompatibility. However, early resorption and insufficient strength remain the main problems that hinder their use. Heat treatment has previously been thoroughly studied as a post-shaping process, especially after the fabrication of complex parts (e.g. porous structures) by 3D-printing or powder metallurgy. In this work, the effect of heat treatment on Mg-1...
January 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28073074/tribocorrosion-behavior-of-bio-functionalized-highly-porous-titanium
#7
F Toptan, A C Alves, A M P Pinto, P Ponthiaux
Titanium and its alloys are widely used in orthopedic and dental implants, however, some major clinical concerns such as poor wear resistance, lack of bioactivity, and bone resorption due to stress shielding are yet to be overcome. In order to improve these drawbacks, highly porous Ti samples having functionalized surfaces were developed by powder metallurgy with space holder technique followed by anodic treatment. Tribocorrosion tests were performed in 9g/L NaCl solution using a unidirectional pin-on-disc tribometer under 3N normal load, 1Hz frequency and 4mm track diameter...
January 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28068622/tribological-behavior-of-ti6al4v-cellular-structures-produced-by-selective-laser-melting
#8
F Bartolomeu, M Sampaio, O Carvalho, E Pinto, N Alves, J R Gomes, F S Silva, G Miranda
Additive manufacturing (AM) technologies enable the fabrication of innovative structures with complex geometries not easily manufactured by traditional processes. Regarding metallic cellular structures with tailored/customized mechanical and wear performance aiming to biomedical applications, Selective Laser Melting (SLM) is a remarkable solution for their production. Focusing on prosthesis and implants, in addition to a suitable Young's modulus it is important to assess the friction response and wear resistance of these cellular structures in a natural environment...
January 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28068621/formation-of-porous-hpcl-lpcl-ha-scaffolds-with-supercritical-co2-gas-foaming-method
#9
M Zahedi Moghadam, Sh Hassanajili, F Esmaeilzadeh, M Ayatollahi, M Ahmadi
Scaffold is a 3D porous structure that is made of different materials, such as synthetic and natural polymers. It plays the role of a synthetic extracellular matrix and permits adhesion, proliferation and differentiation of the cells. Porosity and pore size are the important factors for any 3D scaffold used in bone tissue engineering. In this study, porous scaffolds were prepared by adding hydroxyapatite (HA) nanoparticles as filler to the polymeric matrix of polycaprolactone (PCL) blends with two different molecular weight by using supercritical CO2 (ScCO2) foaming method...
January 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28073075/freeform-extrusion-fabrication-of-titanium-fiber-reinforced-13-93-bioactive-glass-scaffolds
#10
Albin Thomas, Krishna C R Kolan, Ming C Leu, Gregory E Hilmas
Although implants made with bioactive glass have shown promising results for bone repair, their application in repairing load-bearing long bone is limited due to their poor mechanical properties in comparison to human bone. This work investigates the freeform extrusion fabrication of bioactive silicate 13-93 glass scaffolds reinforced with titanium (Ti) fibers. A composite paste prepared with 13-93 glass and Ti fibers (~16µm in diameter and lengths varying from ~200µm to ~2 mm) was extruded through a nozzle to fabricate scaffolds (0-90° filament orientation pattern) on a heated plate...
December 31, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28088070/fatigue-life-of-bovine-meniscus-under-longitudinal-and-transverse-tensile-loading
#11
Jaremy J Creechley, Madison E Krentz, Trevor J Lujan
The knee meniscus is composed of a fibrous extracellular matrix that is subjected to large and repeated loads. Consequently, the meniscus is frequently torn, and a potential mechanism for failure is fatigue. The objective of this study was to measure the fatigue life of bovine meniscus when applying cyclic tensile loads either longitudinal or transverse to the principal fiber direction. Fatigue experiments consisted of cyclic loads to 60%, 70%, 80% or 90% of the predicted ultimate tensile strength until failure occurred or 20,000 cycles was reached...
December 27, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28064103/why-do-some-titanium-alloy-total-hip-arthroplasty-modular-necks-fail
#12
Samo K Fokter, Andrej Moličnik, Rajko Kavalar, Primož Pelicon, Rebeka Rudolf, Nenad Gubeljak
BACKGROUND: Increased modularity in total hip arthroplasty (THA) through extra junction between the neck and the femoral stem is gaining popularity among orthopaedic community. However, the advantage of the additional junction is shadowed by an increased risk of mechanical failure. The aim of this study was to describe the exact mechanism of fracture of the modular femoral neck in an uncemented stem. METHODS: Clinical, metallurgical, and mechanical analysis including finite-element modelling and elemental-sensitive tissue analysis with the micro-PIXE method was performed on two patients treated with fully modular primary THA made from Titanium alloy of the same oval taper-cone design...
December 27, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28049090/new-regime-in-the-mechanical-behavior-of-skin-strain-softening-occurring-before-strain-hardening
#13
S Nicolle, J Decorps, B Fromy, J-F Palierne
We report linear and non-linear shear tests on rat skin, evidencing a strain-softening regime, from 1% to 50% strain, followed by a strong strain-hardening regime, leading to a 'deck chair-shaped' stress-strain curve. The strain-softening regime was never reported as such in the literature, possibly mistaken for the linear regime in experiments starting above 1% deformation. The time-dependent response is akin to that of a gel, with a power-law frequency-dependent dynamic shear modulus ranging from ~5.6kPa to ~10kPa between 0...
December 27, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28068623/processing-and-mechanical-characteristics-of-magnesium-hydroxyapatite-metal-matrix-biocomposites
#14
R Del Campo, B Savoini, A Muñoz, M A Monge, R Pareja
Magnesium/hydroxyapatite composites were produced by conventional extrusion and their mechanical behavior studied under uniaxial compression at room temperature. The results evidence the capability of the HA for strengthening the Mg material, lowering its microstructural anisotropy and inhibiting deformation twinning. They also reveal that the ECAP processing is effective for improving the grain structure and reducing the crystallographic texture of these composites, giving rise to a significant enhancement of their yield strength and microhardness although the ultimate compressive stress worsens...
December 24, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28040607/investigation-of-inhomogeneous-and-anisotropic-material-behavior-of-porcine-thoracic-aorta-using-nano-indentation-tests
#15
Golriz Kermani, Ali Hemmasizadeh, Soroush Assari, Michael Autieri, Kurosh Darvish
This study investigates the inhomogeneity and anisotropy of porcine descending thoracic aorta in three dimensions using a custom-made nano-indentation technique and a quasi-linear viscoelastic modeling approach. The indentation tests were conducted in axial, circumferential, and radial orientations with about 100 μm spatial resolution. The ratio of the elastic moduli obtained in different orientations was used to quantify the tissue local anisotropy. The distal sections were generally stiffer than the proximal ones in both axial and circumferential indentations...
December 24, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28081481/fatigue-limits-of-different-peek-materials-for-dental-implants
#16
Andreas Dominik Schwitalla, Tycho Zimmermann, Tobias Spintig, Ilona Kallage, Wolf-Dieter Müller
The increasing use of PEEK (poly-ether-ether-ketone) as a substitute for metal implant components has led to the suggestion that it could also be used as an alternative to titanium in the field of dental implants. A major requirement for dental implant materials is their resistance to cyclic loading due to mastication. A special fatigue test was designed to evaluate the elastic behavior and long-term form stability of cylindrically shaped PEEK specimens of 4, 5 and 6mm in diameter, using 11 different PEEK materials of various grades: unfilled, filled with titanium dioxide or barium sulfate powder, reinforced with short carbon fibers or short glass fibers, and reinforced with continuous carbon fibers...
December 23, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28040610/the-impact-of-metastasis-on-the-mineral-phase-of-vertebral-bone-tissue
#17
Mikhail Burke, Ayelet Atkins, Alex Kiss, Margarete Akens, Albert Yee, Cari Whyne
The negative impact of metastases on the mechanical performance of vertebral bone is often attributed to reduced bone density and/or compromised architecture. However limited characterization has been done on the impact of metastasis on the mineralization of bone tissue and resulting changes in material behaviour. This study aimed to evaluate the impact of metastasis on micro and nano scale characteristics of the mineral phase of bone, specifically mineral crystal growth, homogeneity of mineralization and changes in intrinsic material properties...
December 23, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28040609/in-situ-observation-of-lubricant-film-formation-in-thr-considering-real-conformity-the-effect-of-diameter-clearance-and-material
#18
D Nečas, M Vrbka, F Urban, J Gallo, I Křupka, M Hartl
The aim of the present study is to provide an analysis of protein film formation in hip joint replacements considering real conformity based on in situ observation of the contact zone. The main attention is focused on the effect of implant nominal diameter, diametric clearance and material. For this purpose, a pendulum hip joint simulator equipped with electromagnetic motors enabling to apply continuous swinging flexion-extension motion was employed. The experimental configuration consists of femoral component (CoCrMo, BIOLOX®forte, BIOLOX®delta) and acetabular cup from optical glass fabricated according to the dimensions of real cups...
December 23, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28088071/discrete-quasi-linear-viscoelastic-damping-analysis-of-connective-tissues-and-the-biomechanics-of-stretching
#19
Behzad Babaei, Aaron J Velasquez-Mao, Stavros Thomopoulos, Elliot L Elson, Steven D Abramowitch, Guy M Genin
The time- and frequency-dependent properties of connective tissue define their physiological function, but are notoriously difficult to characterize. Well-established tools such as linear viscoelasticity and the Fung quasi-linear viscoelastic (QLV) model impose forms on responses that can mask true tissue behavior. Here, we applied a more general discrete quasi-linear viscoelastic (DQLV) model to identify the static and dynamic time- and frequency-dependent behavior of rabbit medial collateral ligaments. Unlike the Fung QLV approach, the DQLV approach revealed that energy dissipation is elevated at a loading period of ∼10s...
December 22, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28086148/a-comparative-study-of-mechanical-properties-of-fresh-and-frozen-thawed-porcine-intervertebral-discs-in-a-bioreactor-environment
#20
M Azarnoosh, M Stoffel, V Quack, M Betsch, B Rath, M Tingart, B Markert
Limited availability of fresh intervertebral discs (IVDs) necessitates the use of frozen-thawed samples in biomechanical investigations. Several authors have reported the mechanical properties of frozen-thawed IVDs, but few studies have investigated the effects of storage temperature and cooling rate. The validity and reliability of the applied freezing-thawing procedures are still relatively unknown. The study aims to compare the mechanical responses of fresh porcine IVDs and porcine IVDs, which were frozen at different freezing temperatures with a controlled-rate cooling process and then thawed...
December 21, 2016: Journal of the Mechanical Behavior of Biomedical Materials
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