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Journal of the Mechanical Behavior of Biomedical Materials

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https://www.readbyqxmd.com/read/28645069/controlled-single-bubble-cavitation-collapse-results-in-jet-induced-injury-in-brain-tissue
#1
Saranya Canchi, Karen Kelly, Yu Hong, Michael A King, Ghatu Subhash, Malisa Sarntinoranont
Multiscale damage due to cavitation is considered as a potential mechanism of traumatic brain injury (TBI) associated with explosion. In this study, we employed a TBI relevant hippocampal ex vivo slice model to induce bubble cavitation. Placement of single reproducible seed bubbles allowed control of size, number, and tissue location to visualize and measure deformation parameters. Maximum strain value was measured at 45 µs after bubble collapse, presented with a distinct contour and coincided temporally and spatially with the liquid jet...
June 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28645068/fracture-roughness-and-phase-transformation-in-cad-cam-milling-and-subsequent-surface-treatments-of-lithium-metasilicate-disilicate-glass-ceramics
#2
Abdur-Rasheed Alao, Richard Stoll, Xiao-Fei Song, John R Abbott, Yu Zhang, Jaafar Abduo, Ling Yin
This paper studied surface fracture, roughness and morphology, phase transformations, and material removal mechanisms of lithium metasilicate/disilicate glass ceramics (LMGC/LDGC) in CAD/CAM-milling and subsequent surface treatments. LMGC (IPS e.max CAD) blocks were milled using a chairside dental CAD/CAM milling unit and then treated in sintering, polishing and glazing processes. X-ray diffraction was performed on all processed surfaces. Scanning electron microscopy (SEM) was applied to analyse surface fracture and morphology...
June 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28645510/the-nonlinear-flexural-response-of-a-whole-teleost-fish-contribution-of-scales-and-skin
#3
Lawrence Szewciw, Deju Zhu, Francois Barthelat
The scaled skin of fish is an intricate system that provides mechanical protection against hard and sharp puncture, while maintaining the high flexural compliance required for unhindered locomotion. This unusual combination of local hardness and global compliance makes fish skin an interesting model for bioinspired protective systems. In this work we investigate the flexural response of whole teleost fish, and how scales may affect global flexural stiffness. A bending moment is imposed on the entire body of a striped bass (Morone saxatilis)...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#4
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28645511/lamellae-spatial-distribution-modulates-fracture-behavior-and-toughness-of-african-pangolin-scales
#5
Michael J Chon, Matthew Daly, Bin Wang, Xianghui Xiao, Alireza Zaheri, Marc A Meyers, Horacio D Espinosa
Pangolin scales form a durable armor whose hierarchical structure offers an avenue towards high performance bio-inspired materials design. In this study, the fracture resistance of African pangolin scales is examined using single edge crack three-point bend fracture testing in order to understand toughening mechanisms arising from the structures of natural mammalian armors. In these mechanical tests, the influence of material orientation and hydration level are examined. The fracture experiments reveal an exceptional fracture resistance due to crack deflection induced by the internal spatial orientation of lamellae...
June 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28629739/twisting-cracks-in-bouligand-structures
#6
Nobphadon Suksangpanya, Nicholas A Yaraghi, David Kisailus, Pablo Zavattieri
The Bouligand structure, which is found in many biological materials, is a hierarchical architecture that features uniaxial fiber layers assembled periodically into a helicoidal pattern. Many studies have highlighted the high damage-resistant performance of natural and biomimetic Bouligand structures. One particular species that utilizes the Bouligand structure to achieve outstanding mechanical performance is the smashing Mantis Shrimp, Odontodactylus Scyllarus (or stomatopod). The mantis shrimp generates high speed, high acceleration blows using its raptorial appendage to defeat highly armored preys...
June 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28623825/application-of-static-fatigue-testing-to-the-behavior-of-absorbable-sutures
#7
J L Prati, D H Kim, M J Matthewson
Absorbable sutures, since their conception, have become the dominant method for surgical wound closure and are constantly being improved. However, despite their years of service, not all aspects of their performance are fully understood. In particular, suture absorption is usually characterized by immersing the suture in a model in vitro environment under zero stress followed by measurement of the residual tensile strength as a function of immersion time. When in use, absorbable sutures are exposed to mechanical stress, which may affect the absorption rate; however, this phenomenon has not been adequately studied...
June 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28622608/a-comparative-study-of-the-mechanical-behaviour-of-thermally-oxidised-commercially-pure-titanium-and-zirconium
#8
A Alansari, Y Sun
The objective of this study is to compare the mechanical behaviour of thermally oxidised commercially pure titanium (CP-Ti) and commercially pure zirconium (CP-Zr). For this purpose, these two bio-metals were thermally oxidised under the same condition (650°C for 6h) and the oxidised specimens were characterised using various analytical and experimental techniques, including oxygen uptake analysis, layer thickness and hardness measurements, scratch tests, dry sliding friction and wear tests and tribocorrosion tests in Ringer's solution...
June 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28622607/mammalian-fibroblast-cells-avoid-residual-stress-zone-caused-by-nanosecond-laser-pulses
#9
Candace Colpitts, Amin M Ektesabi, Rachael A Wyatt, Bryan D Crawford, Amirkianoosh Kiani
This study investigates the effects of laser irradiation on crystalline silicon and its application in biomaterials. We used an analytical model to predict the ablation depth and pit size resulting from laser exposure of silicon samples. The temperatures generated are predicted correlate with laser power, and to result in the formation of a residual stress zone bordering the ablated groove. Different crystal orientations found in the substrate confirm that there was crystal distortion, which consequently induces these residual stress zones...
June 9, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28609705/corrosion-and-tribocorrosion-behavior-of-ti-tib-tinx-in-situ-hybrid-composite-synthesized-by-reactive-hot-pressing
#10
J I Silva, A C Alves, A M Pinto, F Toptan
Ti and its alloys are attractive materials for variety of fields, including biomedical implants, however, the wear behavior is yet to be improved. In the present work, Ti-TiB-TiNx in-situ metal matrix composites were synthesized by reactive hot pressing using a Ti-BN powder blend. Corrosion behavior was investigated in 9g/L NaCl solution at 37°C by performing potentiodynamic polarization and electrochemical impedance spectroscopy. Tribocorrosion behavior was investigated using reciprocating tribometer, against an alumina ball, under 1 and 10N normal load, 1 and 2Hz frequency, in 9g/L NaCl solution at 37°C...
June 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28601760/synthesis-of-imidazolium-containing-mono-methacrylates-as-polymerizable-antibacterial-agents-for-acrylic-bone-cements
#11
Wenbin Zhu, Fang Liu, Jingwei He
With the aim to prepare antibacterial acrylic bone cements, a series of imidazolium-containg mono-methacrylates with N-alkyl chain length varied from 10 to 18 (MEIM-x) were synthesized as polymerizable antibacterial agents through a two-step reaction. The structures of the monomers were confirmed by (1)H NMR. Methyl methacrylate in the liquid compoent of cements was partially replaced by MEIM-x to prepare bone cements with 5wt% of MEIM-x. Properties of prepared cements like antibacterial activity, doughing time, curing parameters including maximum temperature (Tmax) and setting time (tset), flexual strength (FS) and modulus (FM), compressive strength (CS) and fluid uptake (FU) in Ringer's solution were investigated...
June 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28646754/free-energy-analysis-of-cell-spreading
#12
Eóin McEvoy, Vikram S Deshpande, Patrick McGarry
In this study we present a steady-state adaptation of the thermodynamically motivated stress fiber (SF) model of Vigliotti et al. (2015). We implement this steady-state formulation in a non-local finite element setting where we also consider global conservation of the total number of cytoskeletal proteins within the cell, global conservation of the number of binding integrins on the cell membrane, and adhesion limiting ligand density on the substrate surface. We present a number of simulations of cell spreading in which we consider a limited subset of the possible deformed spread-states assumed by the cell in order to examine the hypothesis that free energy minimization drives the process of cell spreading...
June 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28605722/functional-trade-off-between-strength-and-thermal-capacity-of-dermal-armor-insights-from-girdled-lizards
#13
Chris Broeckhoven, Anton du Plessis, Cang Hui
The presence of dermal armor is often unambiguously considered the result of an evolutionary predator-prey arms-race. Recent studies focusing predominantly on osteoderms - mineralized elements embedded in the dermis layer of various extant and extinct vertebrates - have instead proposed that dermal armor might exhibit additional functionalities besides protection. Multiple divergent functionalities could impose conflicting demands on a phenotype, yet, functional trade-offs in dermal armor have rarely been investigated...
June 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28605721/dynamic-analysis-of-bulk-fill-composites-effect-of-food-simulating-liquids
#14
Ahmed Hesham Eweis, Adrian U-Jin Yap, Noor Azlin Yahya
This study investigated the effect of food simulating liquids on visco-elastic properties of bulk-fill restoratives using dynamic mechanical analysis. One conventional composite (Filtek Z350 [FZ]), two bulk-fill composites (Filtek Bulk-fill [FB] and Tetric N Ceram [TN]) and a bulk-fill giomer (Beautifil-Bulk Restorative [BB]) were evaluated. Specimens (12 × 2 × 2mm) were fabricated using customized stainless steel molds. The specimens were light-cured, removed from their molds, finished, measured and randomly divided into six groups...
June 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28646753/mechanical-properties-and-molecular-structure-analysis-of-subsurface-dentin-after-er-yag-laser-irradiation
#15
Zhengdi He, Lingling Chen, Xuejuan Hu, Yasushi Shimada, Masayuki Otsuki, Junji Tagami, Shuangchen Ruan
The purpose of this study was to evaluate the chemical and mechanical modifications in subsurface dentin layer after Er: YAG (Erbium-Yttrium Aluminium Garnet) laser irradiation, as the guidance of new dental restorative materials specific for laser irradiated dentin. MATERIALS AND METHODS: Dentin disks obtained from extracted human molars were prepared and exposed to a single pulse Er:YAG laser irradiation at 80mJ/pulse. After laser irradiation the mechanical and chemical characteristics of intertubular dentin in subsurface layer were studied using nanoindentation tester and micro-Raman spectromy (μ-RS)...
June 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28622962/synergistic-structures-from-magnetic-freeze-casting-with-surface-magnetized-alumina-particles-and-platelets
#16
Michael B Frank, Sze Hei Siu, Keyur Karandikar, Chin-Hung Liu, Steven E Naleway, Michael M Porter, Olivia A Graeve, Joanna McKittrick
Magnetic freeze casting utilizes the freezing of water, a low magnetic field and surface magnetized materials to make multi-axis strengthened porous scaffolds. A much greater magnetic moment was measured for larger magnetized alumina platelets compared with smaller particles, which indicated that more platelet aggregation occurred within slurries. This led to more lamellar wall alignment along the magnetic field direction during magnetic freeze casting at 75 mT. Slurries with varying ratios of magnetized particles to platelets (0:1, 1:3, 1:1, 3:1, 7:1, 1:0) produced porous scaffolds with different structural features and degrees of lamellar wall alignment...
June 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28599155/effect-of-acidic-agents-on-the-wear-behavior-of-a-polymer-infiltrated-ceramic-network-picn-material
#17
Ping Yu, Zhou Xu, Dwayne D Arola, Jie Min, Peng Zhao, Shanshan Gao
Polymer infiltrated ceramic network (PICN) materials exhibit desirable properties for replacement of tooth structure. However, their durability and their integrity in various oral environments, remain relatively unknown. The primary objective of this study is to investigate the effect of acidic agents on the wear behavior of PICNs. Twenty specimens were randomly assigned to four groups and then immersed in either deionized water (control) or acidic agents (2% acetic acid, citric acid or lactic acid solutions) at 37℃ for 4 weeks...
June 2, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28599154/the-importance-of-the-relationship-between-mechanical-analyses-and-rheometry-of-mucoadhesive-thermoresponsive-polymeric-materials-for-biomedical-applications
#18
Sabrina Barbosa De Souza Ferreira, Jéssica Bassi Da Silva, Mariana Volpato Junqueira, Fernanda Belincanta Borghi-Pangoni, Raquel Guttierres Gomes, Marcos Luciano Bruschi
Pluronic F127(®) was associated with a carbomer homopolymer type B, as a model polymer blend to evidence the information provided by rheological and mechanical analyses on the development of bioadhesive thermoresponsive systems. The mechanical analysis enabled to observe that 20% (w/w) Pluronic F127(®)-polymer blends were harder, more adhesive, more mucoadhesive, more compressive and less soft. In addition, continuous flow rheometry demonstrated that the systems were plastic with rheopexy (15%, w/w, Pluronic F127(®)) or thixotropic (20%, w/w, Pluronic F127(®))...
June 2, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28623826/mechanical-characterization-via-nanoindentation-of-the-woven-bone-developed-during-bone-transport
#19
J Mora-Macías, A Pajares, P Miranda, J Domínguez, E Reina-Romo
Nanoindentation has been used successfully in the determination of the mechanical properties of bone. Its application in fracture healing provides information on the evolution of material properties of the woven bone during regeneration process. However, this technique has not been applied in assessing the mechanical properties of woven bone during distraction osteogenesis. Therefore, the aim of this work is to evaluate the spatial and temporal variations of the elastic modulus of the woven bone generated during the bone transport process...
June 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28618328/preparation-of-a-polylactic-acid-knitting-mesh-for-pelvic-floor-repair-and-in-vivo-evaluation
#20
Yao Lu, Shengnan Dong, Peihua Zhang, Xin Liu, Xungai Wang
The health warning report by the Food and Drug Administration (FDA) in 2011 has drawn attention to the need for developing a suitable bio-scaffold for repairing female pelvic from disease. This work prepared a pure polylactic acid knitting mesh (PPA) and compared its structure and properties with a commercial mesh - Surgimesh® Prolapse (SP; Aspide Medical, France). Mechanical tests showed that the PPA mesh was stronger than SP with higher breaking strength and bursting strength. The in vivo property of PPA was evaluated with an animal model...
June 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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