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Journal of Materials Science. Materials in Medicine

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https://www.readbyqxmd.com/read/28730462/nd-induced-honeycomb-structure-of-intermetallic-phase-enhances-the-corrosion-resistance-of-mg-alloys-for-bone-implants
#1
Cijun Shuai, Youwen Yang, Shuping Peng, Chengde Gao, Pei Feng, Jian Chen, Yong Liu, Xin Lin, Sheng Yang, Fulai Yuan
Mg-5.6Zn-0.5Zr alloy (ZK60) tends to degrade too rapid for orthopedic application, in spite of its natural degradation, suitable strength and good biocompatibility. In this study, Nd was alloyed with ZK60 via laser melting method to enhance its corrosion resistance. The microstructure features, mechanical properties and corrosion behaviors of ZK60-xNd (x = 0, 1.8, 3.6, 5.4 wt.%) were investigated. Results showed that laser melted ZK60-xNd were composed of fine ɑ-Mg grains and intermetallic phases along grain boundaries...
September 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28721665/micro-computed-tomography-characterization-of-tissue-engineering-scaffolds-effects-of-pixel-size-and-rotation-step
#2
Ibrahim Fatih Cengiz, Joaquim Miguel Oliveira, Rui L Reis
Quantitative assessment of micro-structure of materials is of key importance in many fields including tissue engineering, biology, and dentistry. Micro-computed tomography (µ-CT) is an intensively used non-destructive technique. However, the acquisition parameters such as pixel size and rotation step may have significant effects on the obtained results. In this study, a set of tissue engineering scaffolds including examples of natural and synthetic polymers, and ceramics were analyzed. We comprehensively compared the quantitative results of µ-CT characterization using 15 acquisition scenarios that differ in the combination of the pixel size and rotation step...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28721664/reciprocal-influence-of-hmscs-hacat-cultivated-on-electrospun-scaffolds
#3
Sirsendu Bhowmick, Sandra Rother, Heike Zimmermann, Poh S Lee, Stephanie Moeller, Matthias Schnabelrauch, Veena Koul, Dieter Scharnweber
Here, we investigated the synergistic effect of electrospun nanofibrous scaffolds made of gelatin /sulfated hyaluronan (sHA) or native hyaluronan (HA)/chondroitin sulfate (CS) and, keratinocytes (HaCaT)-human mesenchymal stem cells (hMSCs) contact co-culture on epithelial differentiation of hMSCs. The hMSCs were co-cultured in contact with HaCaT cells for 5 days on electrospun scaffold. Results show that electrospun scaffolds containing sulfated glycosaminoglycans (GAGs) stimulate epithelial differentiation in terms of various protein expression markers (keratin 14, ΔNp63α and Pan-cytokeratin) and gene expression of several dermal proteins (keratin 14, ΔNp63α)...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28721663/influence-of-direct-or-indirect-contact-for-the-cytotoxicity-and-blood-compatibility-of-spider-silk
#4
J W Kuhbier, V Coger, J Mueller, C Liebsch, F Schlottmann, V Bucan, P M Vogt, S Strauss
Spider silk became one of the most-researched biomaterials in the last years due to its unique mechanical strength and most favourable chemical composition for tissue engineering purposes. However, standardized analysis of cytocompatibility is missing. Therefore, the aim of this study was to investigate hemolysis, cytotoxicity of native spider silk as well as influences on the cell culture medium. Changes of cell culture medium composition, osmolarity as well as glucose and lactate content were determined via ELISA measurement...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28711997/effects-of-degradable-osteosynthesis-plates-of-mgyrezr-alloy-on-cell-function-of-human-osteoblasts-fibroblasts-and-osteosarcoma-cells
#5
Hendrik Naujokat, Aydin Gülses, Jörg Wiltfang, Yahya Açil
The aim was to evaluate the biocompatibility of osteosynthesis plates of the MgYREZr/WE43 alloy by using human cells in vitro. Eluates of degradable magnesium osteosynthesis plates as well as halved plates were used for incubation with human osteoblasts, fibroblasts and osteosarcoma cells. The cell viability was evaluated by using FDA/PI-Staining and LDH analysis. Cell proliferation was assessed by MTT, WST-Test and BrdU-ELISA. Scanning electron microscope was used for investigation of the cell adhesion. The number of devitalized cells in all treatment groups did not significantly deviate from the control group...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28707137/surface-modification-of-esophageal-stent-materials-by-a-polyethylenimine-layer-aiming-at-anti-cancer-function
#6
Kun Zhang, Yuxin Bai, Xiaofeng Wang, Qian Li, Fangxia Guan, Jingan Li
Esophageal cancer is difficult to cure globally and possesses high mortality rate, and it is generally accepted that palliative care such as stent implantation is the main therapy method for esophageal cancer in later period. However, the restenosis caused by tumor cells and inflammatory cells seriously interferes the stent clinical application and limits its long-term services. To solve this problem, series of drug delivery stents were developed and proven rather effective in the early stage of implantation, but more serious restenosis occurred after the drug delivery was over, which endangered the patients' life...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28707136/the-formation-of-a-functional-retinal-pigment-epithelium-occurs-on-porous-polytetrafluoroethylene-substrates-independently-of-the-surface-chemistry
#7
Victoria R Kearns, Jack Tasker, Zhuola, Riaz Akhtar, Akash Bachhuka, Krasimir Vasilev, Carl M Sheridan, Rachel L Williams
Subretinal transplantation of functioning retinal pigment epithelial (RPE) cells may have the potential to preserve or restore vision in patients affected by blinding diseases such as age-related macular degeneration (AMD). One of the critical steps in achieving this is the ability to grow a functioning retinal pigment epithelium, which may need a substrate on which to grow and to aid transplantation. Tailoring the physical and chemical properties of the substrate should help the engineered tissue to function in the long term...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28698941/spine-rod-straightening-as-a-possible-cause-for-revision
#8
Reed Ayers, Mathew Hayne, Evalina Burger
In a previous study, the authors examined the elastic and short-term anelastic springback of Ti6Al4V, CoCrMoC and A316L stainless steel spine rods to observe how the rods mechanically respond in OR contouring. In that study rods were 200 mm long and only the movement at the tip was recorded. The implication of that work was that rods will straighten in-vivo, however, in order for the mechanism of straightening to be determined, the movement of individual bends over time must first be elucidated. Spine rods used were, commercially pure titanium (CP Ti) a primarily α-phase; Ti-6Al-4V; α/β-phase titanium alloy from two different suppliers (denoted by, Ti-6Al-4V (L) and Ti-6Al-4V); β-phase titanium (TNTZ) and CoCrMoC...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28689353/-fabrication-of-arbitrarily-shaped-carbonate-apatite-foam-based-on-the-interlocking-process-of-dicalcium-hydrogen-phosphate-dihydrate
#9
Yuki Sugiura, Kanji Tsuru, Kunio Ishikawa
Carbonate apatite (CO3Ap) foam with an interconnected porous structure is highly attractive as a scaffold for bone replacement. In this study, arbitrarily shaped CO3Ap foam was formed from α-tricalcium phosphate (α-TCP) foam granules via a two-step process involving treatment with acidic calcium phosphate solution followed by hydrothermal treatment with NaHCO3. The treatment with acidic calcium phosphate solution, which is key to fabricating arbitrarily shaped CO3Ap foam, enables dicalcium hydrogen phosphate dihydrate (DCPD) crystals to form on the α-TCP foam granules...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28685233/electrospun-3d-composite-scaffolds-for-craniofacial-critical-size-defects
#10
V Yogeshwar Chakrapani, T S Sampath Kumar, Deepa K Raj, T V Kumary
Critical size defects in the craniofacial region can be effectively treated using three dimensional (3D) composite structures mimicking natural extra cellular matrix (ECM) and incorporated with bioactive ceramics. In this study we have shown that the dynamic liquid bath collector can be used to form electrospun polycaprolactone (PCL)-hydroxyapatite (HA) composite structure as unique 3D scaffold. The structure was found to have three distinct sections (base, stem and head) based on the mechanism of its formation and morphology...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28685232/on-the-bulk-degradation-of-yttria-stabilized-nanocrystalline-zirconia-dental-implant-abutments-an-electron-backscatter-diffraction-study
#11
V Ocelík, U Schepke, H Haji Rasoul, M S Cune, J Th M De Hosson
Degradation of yttria-stabilized zirconia dental implants abutments due to the tetragonal to monoclinic phase transformation was studied in detail by microstructural characterization using Electron Back Scatter Diffraction (EBSD). The amount and distribution of the monoclinic phase, the grain-size distribution and crystallographic orientations between tetragonal and monoclinic crystals in 3 mol.% yttria-stabilized polycrystalline zirconia (3Y-TZP) were determined in two different types of nano-crystalline dental abutments, even for grains smaller than 400 nm...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28685231/hybrid-polymeric-protein-nano-carriers-hppnc-for-targeted-delivery-of-tgf%C3%AE-inhibitors-to-hepatocellular-carcinoma-cells
#12
Nemany A N Hanafy, Alessandra Quarta, Riccardo Di Corato, Luciana Dini, Concetta Nobile, Vittorianna Tasco, Sonia Carallo, Mariafrancesca Cascione, Andrea Malfettone, Jitka Soukupova, Rosaria Rinaldi, Isabel Fabregat, Stefano Leporatti
TGFβ1 pathway antagonists have been considered promising therapies to attenuate TGFβ downstream signals in cancer cells. Inhibiting peptides, as P-17 in this study, are bound to either TGFβ1 or its receptors, blocking signal transduction. However, for efficient use of these TGFβ1antagonist as target therapeutic tools, improvement in their delivery is required. Here, a plasmid carrying specific shDNA (SHT-DNA), small interfering RNA (siRNA), and the peptide (P-17) were loaded separately into folic acid (FA)-functionalized nano-carriers made of Bovine Serum Albumin (BSA)...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28685230/erratum-to-development-of-antimicrobial-coating-by-layer-by-layer-dip-coating-of-chlorhexidine-loaded-micelles
#13
Supreeda Tambunlertchai, Siriwan Srisang, Norased Nasongkla
No abstract text is available yet for this article.
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28681217/how-calcite-and-modified-hydroxyapatite-influence-physicochemical-properties-and-cytocompatibility-of-alpha-tcp-based-bone-cements
#14
Aneta Zima, Joanna Czechowska, Dominika Siek, Radosław Olkowski, Magdalena Noga, Małgorzata Lewandowska-Szumieł, Anna Ślósarczyk
Nowadays successful regeneration of damaged bone tissue is a major problem of the reconstructive medicine and tissue engineering. Recently a great deal of attention has been focused on calcium phosphate cements (CPCs) as the effective bone fillers. Despite a number of studies regarding CPCs, only a few compare the physicochemical and biological properties of α-TCP based materials of various phase compositions. In our study we compared the effect of several components (calcite, hydroxyapatite doped with Mg(2+), CO3(2-) or Ag(+) ions, alginate, chitosan and methylcellulose) on the physicochemical and biological properties of α-TCP-based bone cements...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28681216/preparation-and-characterization-of-maghemite-nanoparticles-from-mild-steel-for-magnetically-guided-drug-therapy
#15
Nitesh Kumar, Kaustubh Kulkarni, Laxmidhar Behera, Vivek Verma
Maghemite (γ-Fe 2 O 3) nanoparticles for therapeutic applications are prepared from mild steel but the existing synthesis technique is very cumbersome. The entire process takes around 100 days with multiple steps which lack proper understanding. In the current work, maghemite nanoparticles of cuboidal and spheroidal morphologies were prepared from mild steel chips by a novel cost effective oil reduction technique for magnetically guided intravascular drug delivery. The technique developed in this work yields isometric sized γ-Fe 2 O 3 nanoparticles in 6 h with higher saturation magnetization as compared to the existing similar solid state synthesis route...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28647792/regeneration-of-hyaline-cartilage-promoted-by-xenogeneic-mesenchymal-stromal-cells-embedded-within-elastin-like-recombinamer-based-bioactive-hydrogels
#16
David Pescador, Arturo Ibáñez-Fonseca, Fermín Sánchez-Guijo, Jesús G Briñón, Francisco Javier Arias, Sandra Muntión, Cristina Hernández, Alessandra Girotti, Matilde Alonso, María Consuelo Del Cañizo, José Carlos Rodríguez-Cabello, Juan Francisco Blanco
Over the last decades, novel therapeutic tools for osteochondral regeneration have arisen from the combination of mesenchymal stromal cells (MSCs) and highly specialized smart biomaterials, such as hydrogel-forming elastin-like recombinamers (ELRs), which could serve as cell-carriers. Herein, we evaluate the delivery of xenogeneic human MSCs (hMSCs) within an injectable ELR-based hydrogel carrier for osteochondral regeneration in rabbits. First, a critical-size osteochondral defect was created in the femora of the animals and subsequently filled with the ELR-based hydrogel alone or with embedded hMSCs...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28631013/in-vivo-evaluation-of-the-bone-integration-of-coated-poly-vinyl-alcohol-hydrogel-fiber-implants
#17
David Moreau, Arthur Villain, Manon Bachy, Henry Proudhon, David N Ku, Didier Hannouche, Hervé Petite, Laurent Corté
Recently, it has been shown that constructs of poly(vinyl alcohol) (PVA) hydrogel fibers reproduce closely the tensile behavior of ligaments. However, the biological response to these systems has not been explored yet. Here, we report the first in vivo evaluation of these implants and focus on the integration in bone, using a rabbit model of bone tunnel healing. Implants consisted in bundles of PVA hydrogel fibers embedded in a PVA hydrogel matrix. Half of the samples were coated with a composite coating of hydroxyapatite (HA) particles embedded in PVA hydrogel...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28625001/nanostructured-sba-15-host-applied-in-ketorolac-tromethamine-release-system
#18
Jorgelina Cussa, Juliana M Juárez, Marcos B Gómez Costa, Oscar A Anunziata
The ordered mesoporous silica SBA-15 has been applied in studies of ketorolac tromethamine adsorption and release. The SBA-15 materials with hexagonal and regular structure were obtained using a triblock copolymer Pluronic P123 as a template and TEOS as a silica source. Ketorolac tromethamine was adsorbed into SBA-15 silica nanochannels using ethanol as solvent. The physicochemical and textural properties of SBA-15 and ketorolac tromethamine/SBA-15 were characterized by X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, fourier transform infrared spectroscopy and BET surface studies...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28620829/appearance-of-cell-adhesion-factor-in-osteoblast-proliferation-and-differentiation-of-apatite-coating-titanium-by-blast-coating-method
#19
Hirotsugu Umeda, Takamitsu Mano, Koji Harada, Ferdous Tarannum, Yoshiya Ueyama
We have already reported that the apatite coating of titanium by the blast coating (BC) method could show a higher rate of bone contact from the early stages in vivo, when compared to the pure titanium (Ti) and the apatite coating of titanium by the flame spraying (FS) method. However, the detailed mechanism by which BC resulted in satisfactory bone contact is still unknown. In the present study, we investigated the importance of various factors including cell adhesion factor in osteoblast proliferation and differentiation that could affect the osteoconductivity of the BC disks...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28616826/deposition-of-crystalline-hydroxyapatite-nano-particle-on-zirconia-ceramic-a-potential-solution-for-the-poor-bonding-characteristic-of-zirconia-ceramics-to-resin-cement
#20
Abbas Azari, Sakineh Nikzad, Arash Yazdani, Faezeh Atri, Abbas Fazel Anvari-Yazdi
The poor bonding strength of zirconia to different dental substrates is one of the challenging issues in restorative dentistry. Hydroxyapatite is an excellent biocompatible material with fine bonding properties. In this study, it was hypothesized that hydroxyapatite coating on zirconia would improve its bond strength. Forty-five zirconia blocks were prepared and randomly divided into three groups: hydroxyapatite coating, sandblasting, and no preparation (control). The blocks were bonded to cement and the micro-shear bond strength was measured following load application...
July 2017: Journal of Materials Science. Materials in Medicine
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