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Journal of Materials Science. Materials in Medicine

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https://www.readbyqxmd.com/read/28916983/surface-changes-of-nanotopography-by-carbon-ion-implantation-to-enhance-the-biocompatibility-of-silicone-rubber-an-in-vitro-study-of-the-optimum-ion-fluence-and-adsorbed-protein
#1
Xianhui Li, Xin Zhou, Yao Chen, Shu Yu, Xin Chen, Xin Xia, Xiaohua Shi, Yiming Zhang, Dongli Fan
Lower cellular adhesion and dense fibrous capsule formation around silicone breast implants caused by lower biocompatibility is a serious clinical problem. Preliminary work has shown that ion implantation enhances cell adhesion. Whether the biocompatibility is further enhanced by higher doses of carbon ion implantation and the mechanism by which ion implantation enhances biocompatibility remain unclear. In this study, five doses of carbon ions, which gradually increase, were implanted on the surface of silicone rubber and then the surface characteristics were surveyed...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28916883/different-post-processing-conditions-for-3d-bioprinted-%C3%AE-tricalcium-phosphate-scaffolds
#2
Liciane Sabadin Bertol, Rodrigo Schabbach, Luis Alberto Loureiro Dos Santos
The development of 3D printing hardware, software and materials has enabled the production of bone substitute scaffolds for tissue engineering. Calcium phosphates cements, such as those based on α-tricalcium phosphate (α-TCP), have recognized properties of osteoinductivity, osteoconductivity and resorbability and can be used to 3D print scaffolds to support and induce tissue formation and be replaced by natural bone. At present, however, the mechanical properties found for 3D printed bone scaffolds are only satisfactory for non-load bearing applications...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28914404/development-and-characterization-of-hybrid-tubular-structure-of-plcl-porous-scaffold-with-hmscs-ecs-cell-sheet
#3
Azizah Intan Pangesty, Takaaki Arahira, Mitsugu Todo
Tissue engineering offers an alternate approach to providing vascular graft with potential to grow similar with native tissue by seeding autologous cells into biodegradable scaffold. In this study, we developed a combining technique by layering a sheet of cells onto a porous tubular scaffold. The cell sheet prepared from co-culturing human mesenchymal stem cells (hMSCs) and endothelial cells (ECs) were able to infiltrate through porous structure of the tubular poly (lactide-co-caprolactone) (PLCL) scaffold and further proliferated on luminal wall within a week of culture...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28914400/an-in-vivo-study-on-endothelialized-vascular-grafts-produced-by-autologous-biotubes-and-adipose-stem-cells-adscs
#4
Yu Chieh Tseng, Jun Neng Roan, Ying Chiang Ho, Chih Chan Lin, Ming Long Yeh
Currently, commercial synthetic vascular grafts made from Dacron and ePTFE for small-diameter, vascular applications (<6 mm) show limited reendothelization and are less compliant, often resulting in thrombosis and intimal hyperplasia. Although good blood compatibility can be achieved in autologous arteries and veins, the number of high quality harvest sites is limited, and the grafts are size-mismatched for use in the fistula or cardiovascular bypass surgery; thus, alternative small graft substitutes must be developed...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28914397/influence-of-acid-treatment-on-surface-properties-and-in-vivo-performance-of-ti6al4v-alloy-for-biomedical-applications
#5
Daniel J Fernandes, Ruy G Marques, Carlos N Elias
The purpose of this work was to investigate the influence of acid treatment on the surface properties and in vivo performance of titanium grade 5 (Ti6Al4V) alloy. Mini-implants with surface treatment were inserted into New Zealand rabbit tibia for 1, 4 and 8 weeks. SEM analysis showed intercommunicated micropores in acid treated samples. AFM showed micron and sub-micron roughness. The thickness of the titanium oxide layer increased with surface treatment, with a significant reduction of Al and V concentration...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28914395/repetitive-on-demand-drug-release-from-polymeric-matrices-containing-a-macroscopic-spherical-iron-core
#6
Stefan A Rovers, Maartje F Kemmere, Jos T F Keurentjes, Richard Hoogenboom
A system for multiple on-demand drug release has been prepared that can be activated with an alternating magnetic field as external trigger. The core/shell samples have been developed based on a macroscopic spherical iron core coated with a thermoresponsive polymer, poly(styrene-stat-butyl methacrylate), containing ibuprofen as a model drug. During exposure of the samples to the magnetic field (ON state), the release rate of ibuprofen is significantly increased, up to 35 times the release rate without the magnetic field (OFF state)...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28914392/alginate-hyaluronic-acid-hydrogel-delivery-system-characteristics-regulate-the-differentiation-of-periodontal-ligament-stem-cells-toward-chondrogenic-lineage
#7
Sahar Ansari, Ivana M Diniz, Chider Chen, Tara Aghaloo, Benjamin M Wu, Songtao Shi, Alireza Moshaverinia
Cartilage tissue regeneration often presents a challenging clinical situation. Recently, it has been shown that Periodontal Ligament Stem Cells (PDLSCs) possess high chondrogenic differentiation capacity. In this study, we developed a stem cell delivery system based on alginate/hyaluronic acid (HA) loaded with TGF-β1 ligand, encapsulating PDLSCs; and investigated the chondrogenic differentiation of encapsulated cells in alginate/HA hydrogel microspheres in vitro and in vivo. The results showed that PDLSCs, as well as human bone marrow mesenchymal stem cells (hBMMSCs), as the positive control, were stained positive for both toluidine blue and alcian blue staining, while exhibiting high levels of gene expression related to chondrogenesis (Col II, Aggrecan and Sox-9), as assessed via qPCR...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28905291/morphology-effect-of-nano-hydroxyapatite-as-a-drug-carrier-of-methotrexate
#8
Haina Sun, Shanshan Liu, Xiongfeng Zeng, Xianguang Meng, Lina Zhao, Yizao Wan, Guifu Zuo
In this study, morphology effect of nano-hydroxyapatite as a drug carrier was investigated for the first time. Hydroxyapatite/methotrexate (HAp/MTX) hybrids with different morphologies were successfully prepared in situ using polyethylene glycol (PEG) as a template. SEM, TEM, XRD and FTIR results confirmed that the hybrids of different morphologies (laminated, rod-like and spherical) with similar phase composition and functional groups were obtained by changing the preparation parameters. UV-Vis spectroscopy was used to identify the drug loading capacity and drug release mechanism of the three hybrids with different morphologies...
September 13, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28905286/role-of-phase-separation-on-the-biological-performance-of-45s5-bioglass-%C3%A2
#9
Tia J Kowal, Roman Golovchak, Tanuj Chokshi, Joseph Harms, Ukrit Thamma, Himanshu Jain, Matthias M Falk
We analyzed the biological performance of spinodally and droplet-type phase-separated 45S5 Bioglass(®) generated by quenching the melt from different equilibrium temperatures. MC3T3-E1 pre-osteoblast cells attached more efficiently to 45S5 Bioglass® with spinodal than to the one with droplet morphology, providing the first demonstration of the role of micro-/nano-scale on the bioactivity of Bioglass®. Upon exposure to biological solutions, phosphate buffered saline (PBS) and cell culture medium (α-MEM), a layer of hydroxyapatite (HA) formed on both glass morphologies...
September 13, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28905196/mechanical-evaluation-of-cerebral-aneurysm-clip-scissoring-phenomenon-comparison-of-titanium-alloy-and-cobalt-alloy
#10
Keiji Tsutsumi, Tetsuyoshi Horiuchi, Kazuhiro Hongo
Cerebral aneurysm clip blades crossing during surgery is well known as scissoring. Scissoring might cause rupture of the aneurysm due to laceration of its neck. Although aneurysm clip scissoring is well known, there have been few reports describing the details of this phenomenon. Quasi-scissoring phenomenon was introduced mechanically by rotating the clip head attached to a silicone sheet. The anti-scissoring torque during the twist of the blades was measured by changing the depth and the opening width. The closing force was also evaluated...
September 13, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28905150/silver-doped-hydroxyapatite-coatings-by-sacrificial-anode-deposition-under-magnetic-field
#11
S Swain, T R Rautray
Uniform distribution of silver (Ag) in the hydroxyapatite (HA) coated Ti surface has been a concern for which an attempt has been made to dope Ag in HA coating with and without magnetic field. Cathodic deposition technique was employed to coat Ag incorporated hydroxyapatite coating using a sacrificial silver anode method by using NdFeB bar magnets producing 12 Tesla magnetic field. While uniform deposition of Ag was observed in the coatings under magnetic field, dense coating was evident in the coating without magnetic field conditions...
September 13, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28894995/ibuprofen-loaded-fibrous-patches-taming-inhibition-at-the-spinal-cord-injury-site
#12
Liliana R Pires, Cátia D F Lopes, Daniela Salvador, Daniela N Rocha, Ana Paula Pêgo
It is now widely accepted that a therapeutic strategy for spinal cord injury (SCI) demands a multi-target approach. Here we propose the use of an easily implantable bilayer polymeric patch based on poly(trimethylene carbonate-co-ε-caprolactone) (P(TMC-CL)) that combines physical guidance cues provided by electrospun aligned fibres and the delivery of ibuprofen, as a mean to reduce the inhibitory environment at the lesion site by taming RhoA activation. Bilayer patches comprised a solvent cast film onto which electrospun aligned fibres have been deposited...
September 11, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28875425/initiating-human-articular-chondrocyte-re-differentiation-in-a-3d-system-after-2d-expansion
#13
Abhijith K Kudva, Frank P Luyten, Jennifer Patterson
Cartilage damage affects a large population via acute and chronic injury and disease. Since native cartilage does not self-renew, cartilage tissue engineering has gained traction as a potential treatment. However, a limiting factor is that the primary cell type in cartilage, the articular chondrocyte, tends to de-differentiate when grown on 2D surfaces for in vitro expansion. Thus, 3D systems are being developed and used to counter this loss of chondrogenic capabilities. We hypothesize that a 3D matrix that can be remodeled may be more supportive of the chondrogenic phenotype of encapsulated articular chondrocytes than a 2D surface and may allow for the re-differentiation of chondrocytes after 2D expansion...
September 5, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28875381/differential-apoptotic-response-of-mc3t3-e1-pre-osteoblasts-to-biodegradable-magnesium-alloys-in-an-in-vitro-direct-culture-model
#14
Ehsan Bonyadi Rad, Sepideh Mostofi, Matthias Katschnig, Patrik Schmutz, Magdalena Pawelkiewicz, Regine Willumeit-Römer, Ute Schäfer, Annelie Weinberg
The biodegradable magnesium-based implants have been widely utilized in medical orthopedic applications in recent years. We have recently shown that direct culture on Pure Mg and Mg2Ag alloys lead to a progressive differentiation impairment of MC3T3-E1 pre-osteoblasts. In this study, we aimed to analyze the apoptotic reaction of MC3T3-E1 cells in response to the direct culture on Pure Mg, Mg2Ag and Extreme High Pure Mg (XHP Mg) alloy samples. Our results demonstrated that long-term culturing of MC3T3-E1 cells on Pure Mg and Mg2Ag alloys induce time-dependent expression of active caspase-3 (active casp-3) and cleaved PARP-1 (cl...
September 5, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28864980/activated-carbon-plasticised-agarose-composite-films-for-the-adsorption-of-thiol-as-a-model-of-wound-malodour
#15
M J Illsley, A Akhmetova, C Bowyer, T Nurgozhin, S V Mikhalovsky, J Farrer, P Dubruel, I U Allan
Conditions such as diabetes, cardiovascular disease and long-term immobilisation can precipitate the development of chronic dermal ulcers. Such wounds are associated with inflammation and bacterial contamination which in turn can lead to the liberation of offensive odours that cause patient embarrassment and, in some instances, social isolation. Activated carbon-containing dressings have been used to manage the odours from such wounds. However, these can be bulky and can become fouled by wound exudate. Agarose is a natural polysaccharide derived from seaweed that forms brittle free-standing films that can be made pliable by addition of a plasticiser...
September 1, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28785889/the-kinetics-of-remodeling-of-a-calcium-sulfate-calcium-phosphate-bioceramic
#16
Roberto Civinini, Antonio Capone, Christian Carulli, Fabrizio Matassi, Lorenzo Nistri, Massimo Innocenti
In the last years considerable research and development activity have been expended to find new ceramic bone substitutes for the treatment of bone defects. However in many cases the drawback of synthethic bone substitutes are the slow graft incorporation and remodelling into the host bone. The purpose of this study was to analyze the kinetics of resorption and new bone formation of new calcium sulfate (CaSO4)/calcium phosphate (CaPO4) bioceramic engineered to enhance its bone forming properties. We prospectively evaluated the results of a series of 15 hips with osteonecrosis of the femoral head (ONFH) treated at with core decompression and injection of the CaSO4/CaPO4 composite...
September 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28762142/intracortical-stiffness-of-mid-diaphysis-femur-bovine-bone-lacunar-canalicular-based-homogenization-numerical-solutions-and-microhardness-measurements
#17
Ilige S Hage, Ramsey F Hamade
Microscale lacunar-canalicular (L-C) porosity is a major contributor to intracortical bone stiffness variability. In this work, such variability is investigated experimentally using micro hardness indentation tests and numerically using a homogenization scheme. Cross sectional rings of cortical bones are cut from the middle tubular part of bovine femur long bone at mid-diaphysis. A series of light microscopy images are taken along a line emanating from the cross-section center starting from the ring's interior (endosteum) ring surface toward the ring's exterior (periosteum) ring surface...
September 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28762141/anti-fibronectin-aptamers-improve-the-colonization-of-chitosan-films-modified-with-d-raffinose-by-murine-osteoblastic-cells
#18
L Parisi, C Galli, A Bianchera, P Lagonegro, L Elviri, A Smerieri, S Lumetti, E Manfredi, R Bettini, G M Macaluso
The aim of the present study was to investigate how the enrichment of chitosan films with anti-fibronectin aptamers could enhance scaffold colonization by osteoblasts, by improving their adhesion and accelerating their proliferation. Chitosan discs were enriched with excess of anti-fibronectin aptamer. Aptamer adsorption on chitosan was monitored by measuring aptamer concentration in the supernatant by spectrophotometry, as well as its release, while functionalization was confirmed by labelling aptamers with a DNA intercalating dye...
September 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28755096/analysis-of-the-hemostatic-potential-of-modern-topical-sealants-on-arterial-and-venous-anastomoses-an-experimental-porcine-study
#19
Hamidreza Fonouni, Arash Kashfi, Ali Majlesara, Oliver Stahlheber, Lukas Konstantinidis, Thomas W Kraus, Arianeb Mehrabi, Hani Oweira
One of the widely accepted adjunctive agents in the variety of surgical modalities are sealants. Our study aim was to compare four commonly used modern sealants in a standardized experimental setting to assess their feasibility, and hemostatic efficacy in vascular anastomosis. Forty landrace pigs (weight: 24.7 ± 3.8 kg) were randomized into the control (n = 8) and four sealant groups; TachoSil® (n = 8), Tissucol Duo® (n = 8), Coseal® (n = 8), and FloSeal® (n = 8). After doing a portal vein end-to-end anastomosis as well as stitches of aortic incision, the sealants were applied on anastomotic site...
September 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28744615/stem-cell-mediated-functionalization-of-titanium-implants
#20
Deanna Ingrassia, Martina Sladkova, Michael Palmer, Wei Xia, Håkan Engqvist, Giuseppe Maria de Peppo
Prosthetic implants are used daily to treat edentulous people and to restore mobility in patients affected by skeletal defects. Titanium (Ti) is the material of choice in prosthetics, because it can form a stable bond with the surrounding bone following implantation-a process known as osseointegration. Yet, full integration of prosthetic implants takes time, and fails in clinical situations characterized by limited bone quantity and/or compromised regenerative capacity, and in at-risk patients. Intense research efforts are thus made to develop new implants that are cost-effective, safe, and suited to every patient in each clinical situation...
September 2017: Journal of Materials Science. Materials in Medicine
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