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Journal of Materials Science. Materials in Medicine

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https://www.readbyqxmd.com/read/28337667/self-assembled-polyelectrolyte-complexes-films-as-efficient-compression-coating-layers-for-controlled-releasing-tablets
#1
Wenyan Li, Mengmeng Huo, Arka Sen Chaudhuri, Chen Yang, Dazhong Cao, Zhenghong Wu, Xiaole Qi
Currently, polysaccharide-based hydrogels are widely studied macromolecular networks to modify drug dissolution from controlled-releasing matrix tablets. Among them, polyelectrolyte complexes (PEC) films consisted of chitosan (CS) and sodium alginate (SA) could be obtained via spontaneously assembling under physiological gastrointestinal environment. Here, we utilized these self-assembled PEC films as an efficient coating materials to develop controlled-released matrix tablets through compression coating process, with paracetamol (APAP) as model drug...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28332156/the-pathology-of-failed-mckee-farrar-implants-correlation-with-modern-metal-on-metal-implant-failure
#2
Mitsuru Munemoto, George Grammatopoulos, Yasuhito Tanaka, Max Gibbons, Nicholas A Athanasou
The McKee-Farrar (MF) prosthesis was the first widely used total hip replacement (THR) to employ a metal-on-metal (MoM) articulation. These implants had a high rate of early aseptic loosening but a number achieved good long-term implant survival, stimulating the reintroduction of second and third generation implants of this type. In this study we analysed archival histopathology of periprosthetic tissues in twenty cases of MF aseptic implant failure to determine if there was evidence of an innate and adaptive immune response similar to that seen in modern MoM implants...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28321800/wear-of-morse-taper-and-external-hexagon-implant-joints-after-abutment-removal
#3
Abraão M Prado, Jorge Pereira, Filipe S Silva, Bruno Henriques, Rubens M Nascimento, Cesar A M Benfatti, José López-López, Júlio C M Souza
The aim of this in vitro study was to evaluate the removal torque values on abutments and the morphological wear aspects of two different dental implant joints after immersion in a medium containing biofilm from human saliva. Twenty implant-abutment assemblies were divided into four groups in this study: (A) Morse taper free of medium containing biofilm, and (B) after contact with a medium containing biofilm from human saliva; (C) External Hexagon free of medium containing biofilm, and (D) after contact with medium containing biofilm from human saliva...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28303433/the-decade-of-face-transplant-outcomes
#4
Maria Siemionow
At the 10th year anniversary of the first face transplantation, 37 patients worldwide, were the recipients of faces coming from human donors. Five patients died due to complications, noncompliance with immunosuppressive medications and development of cancer. Despite the initial debates and ethical concerns, face transplantation became a clinical reality with satisfactory functional outcomes. The areas of controversy still include the impact of life-long immunosuppression on otherwise healthy patients as well as the selection process of face transplant candidates...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28251471/wetting-ability-of-biological-liquids-in-presence-of-metallic-nanoparticles
#5
L Torrisi, C Scolaro, N Restuccia
The wetting ability of water and of some biological liquids was measured on different biocompatible surfaces with and without different colloidal metals. Insoluble nanoparticles disperse in biological tissues enhance some properties, such as the interface adhesion between two surfaces, the X-ray contrast of medical images and the absorbed dose during radiotherapy treatments. The introduction of nanoparticles in the liquids generally improves the wetting ability and changes other properties of the solution, due to the different distribution of the adhesion forces, to the nature, morphology and concentration of the added nanoparticles...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28251470/3d-printed-porous-titanium-changed-femoral-head-repair-growth-patterns-osteogenesis-and-vascularisation-in-porous-titanium
#6
Wei Zhu, Yan Zhao, Qi Ma, Yingjie Wang, Zhihong Wu, Xisheng Weng
Osteonecrosis of the femoral head (ONFH) is a major cause of morbidity, and total hip arthroplasty is both traumatic and expensive. Here, we created a gelatine scaffold embedded in uniquely shaped, 3D-printed porous titanium parts, which could attract and promote the proliferation of osteoblasts as well as bone regeneration, as the extracellular matrix (ECM) does in vivo. Interestingly, after hybridisation with platelets, the scaffold exhibited a low yet considerable rate of stable, safe and long-term growth factor release...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28251469/extended-pulsated-drug-release-from-plga-based-minirods
#7
Y Danyuo, O E Oberaifo, J D Obayemi, S Dozie-Nwachukwu, C J Ani, O S Odusanya, M G Zebaze Kana, K Malatesta, W O Soboyejo
The kinetics of degradation and sustained cancer drugs (paclitaxel (PT) and prodigiosin (PG)) release are presented for minirods (each with diameter of ~5 and ~6 mm thick). Drug release and degradation mechanisms were studied from solvent-casted cancer drug-based minirods under in vitro conditions in phosphate buffer solution (PBS) at a pH of 7.4. The immersed minirods were mechanically agitated at 60 revolutions per minute (rpm) under incubation at 37 °C throughout the period of the study. The kinetics of drug release was studied using ultraviolet visible spectrometry (UV-Vis)...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28213747/bone-morphogenetic-protein-2-for-the-treatment-of-congenital-pseudarthrosis-of-the-tibia-or-persistent-tibial-nonunion-in-children-and-adolescents-a-retrospective-study-with-a-minimum-2-year-follow-up
#8
Tim N Hissnauer, Norbert Stiel, Kornelia Babin, Martin Rupprecht, Michael Hoffmann, Johannes M Rueger, Ralf Stuecker, Alexander S Spiro
There is a lack of studies reporting on rhBMP-2 application in pediatric orthopaedics, although few reports demonstrated promising results of the use of rhBMP-2 in children, especially for spine fusion and for the treatment of congenital pseudarthrosis of the tibia. The objectives of this study were (1) to examine clinical and radiographic healing after rhBMP-2 application for the treatment of congenital pseudarthrosis of the tibia (CPT) or persistent tibial nonunion in children and adolescents, and (2) to investigate the safety of rhBMP-2 use in these cases...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28210971/scaffold-free-approach-produces-neocartilage-tissue-of-similar-quality-as-the-use-of-hystem%C3%A2-and-hydromatrix%C3%A2-scaffolds
#9
Janne H Ylärinne, Chengjuan Qu, Mikko J Lammi
Numerous biomaterials are being considered for cartilage tissue engineering, while scaffold-free systems have also been introduced. Thus, it is important to know do the scaffolds improve the formation of manufactured neocartilages. This study compares scaffold-free cultures to two scaffold-containing ones. Six million bovine primary chondrocytes were embedded in HyStem™ or HydroMatrix™ scaffolds, or suspended in scaffold-free chondrocyte culture medium, and then loaded into agarose gel supported culture well pockets...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28210970/a-suspended-carbon-fiber-culture-to-model-myelination-by-human-schwann-cells
#10
Antonio Merolli, Yong Mao, Joachim Kohn
Understanding of myelination/remyelination process is essential to guide tissue engineering for nerve regeneration. In vitro models currently used are limited to cell population studies and cannot easily identify individual cell contribution to the process. We established a novel model to study the contribution of human Schwann cells to the myelination process. The model avoids the presence of neurons in culture; Schwann cells respond solely to the biophysical properties of an artificial axon. The model uses a single carbon fiber suspended in culture media far from the floor of the well...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28210969/host-tissue-response-by-the-expression-of-collagen-to-cyanoacrylate-adhesives-used-in-implant-fixation-for-abdominal-hernia-repair
#11
Gemma Pascual, Marta Rodríguez, Bárbara Pérez-Köhler, Claudia Mesa-Ciller, Mar Fernández-Gutiérrez, Julio San Román, Juan M Bellón
The less traumatic use of surgical adhesives rather than sutures for mesh fixation in hernia repair has started to gain popularity because they induce less host tissue damage and provoke less postoperative pain. This study examines the host tissue response to a new cyanoacrylate (CA) adhesive (n-octyl, OCA). Partial defects (3 × 5 cm) created in the rabbit anterior abdominal wall were repaired by mesh fixation using OCA, Glubran2(®)(n-butyl-CA), Ifabond(®)(n-hexyl-CA) or sutures. Samples were obtained at 14/90 days for morphology, collagens qRT-PCR/immunofluorescence and biomechanical studies...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28210968/study-on-critical-sized-ultra-high-molecular-weight-polyethylene-wear-particles-loaded-with-alendronate-sodium-in-vitro-release-and-cell-response
#12
Yumei Liu, Feng Shi, Kemeng Gong, Yang Liu, Wei Zhi, Jie Weng, Shuxin Qu
The aim of this study was to investigate the in vitro release and the effect of RAW 264.7 macrophages of critical-sized wear particles of ultra-high molecular weight polyethylene (UHMWPE) loaded with alendronate sodium (ALN), one of the most effective drugs to treat osteoporosis in clinic. The critical-sized UHMWPE-ALN 0.5 wt.% wear particles were prepared by vacuum gradient filtration combined with Pluronic F-68. In vitro release of ALN from critical-sized UHMWPE-ALN wear particles was investigated in phosphate buffered saline (PBS) at 37 °C with a shaker...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28210967/core-shell-drug-carrier-from-folate-conjugated-chitosan-obtained-from-prawn-shell-for-targeted-doxorubicin-delivery
#13
Md Sazedul Islam, Papia Haque, Taslim U Rashid, M Nuruzzaman Khan, Abul K Mallik, M Nazrul I Khan, Mala Khan, Mohammed Mizanur Rahman
A multifunctional drug carrier with dual targeting (magnetic and folate-receptor) and pH sensitive core-shell hybrid nanomaterial has been developed to carry an anticancer drug doxorubicin.Superparamagnetic iron oxide nanoparticles (IONPs) were used as core of the carrier and cross-linked folate conjugated chitosan (FA-CS) was acted as shell in which doxorubicin was physically entrapped. Transmission electron microscopy (TEM) analysis confirmed the average particle size of IONPs and FA-CS coated IONPs 8.2 and 15...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28197826/safety-and-efficacy-of-a-novel-abluminal-groove-filled-biodegradable-polymer-sirolimus-eluting-stent
#14
Jinzhou Zhu, Huizhu Liu, Haipo Cui, Zhirong Tang, Chengli Song, Ruiyan Zhang
Late stent thrombosis (LST) following drug-eluting stent (DES) implantation in patients with coronary artery disease (CAD) is often associated with delayed vascular healing, resulting from vascular inflammation and hypersensitivity to durable polymers and drugs. Therefore, DES design, materials, and coatings have been technologically revolutionized. Herein, we designed a novel abluminal groove-filled biodegradable polymer sirolimus-eluting stent (AGF-BP-SES), with a sirolimus content of only about one-third of traditional DES...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28197825/peculiarities-in-thermal-evolution-of-precipitated-amorphous-calcium-phosphates-with-an-initial-ca-p-ratio-of-1-1
#15
Zoltan Zyman, Matthias Epple, Anton Goncharenko, Dmytro Rokhmistrov, Oleg Prymak, Kateryna Loza
Thermal evolution of amorphous calcium phosphate (ACP) powder from a fast nitrate synthesis with a Ca/P ratio of 1:1 were studied in the range of 20-980 °C. The powder consisted of amorphous dicalcium phosphate anhydrate (CaHPO4) after heating to 200 °C. CaHPO4 gradually condensed to amorphous calcium pyrophosphate Ca2P2O7 (CPP) between 200 to 620 °C. Amorphous CPP crystallized at 620-740 °C to a metastable polymorph α'-CPP of the high-temperature phase α-CPP and β-CPP. The α'-CPP/ β-CPP phase ratio reached a maximum at 800 °C (60 wt% α'-CPP/40 wt% β-CPP), and α'-CPP gradually transformed to β-CPP at a higher temperature...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28197824/in-vitro-cytotoxicity-and-surface-topography-evaluation-of-additive-manufacturing-titanium-implant-materials
#16
Jukka T Tuomi, Roy V Björkstrand, Mikael L Pernu, Mika V J Salmi, Eero I Huotilainen, Jan E H Wolff, Pekka K Vallittu, Antti A Mäkitie
Custom-designed patient-specific implants and reconstruction plates are to date commonly manufactured using two different additive manufacturing (AM) technologies: direct metal laser sintering (DMLS) and electron beam melting (EBM). The purpose of this investigation was to characterize the surface structure and to assess the cytotoxicity of titanium alloys processed using DMLS and EBM technologies as the existing information on these issues is scarce. "Processed" and "polished" DMLS and EBM disks were assessed...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28197823/the-deposition-of-strontium-and-zinc-co-substituted-hydroxyapatite-coatings
#17
L Robinson, K Salma-Ancane, L Stipniece, B J Meenan, A R Boyd
The in vitro and in vivo performance of hydroxyapatite (HAp) coatings can be modified by the addition of different trace ions, such as silicon (Si), lithium (Li), magnesium (Mg), zinc (Zn) or strontium (Sr) into the HAp lattice, to more closely mirror the complex chemistry of human bone. To date, most of the work in the literature has considered single ion-substituted materials and coatings, with limited reports on co-substituted calcium phosphate systems. The aim of this study was to investigate the potential of radio frequency magnetron sputtering to deposit Sr and Zn co-substituted HAp coatings using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28197822/enhanced-repair-of-segmental-bone-defects-in-rabbit-radius-by-porous-tantalum-scaffolds-modified-with-the-rgd-peptide
#18
Hui Wang, Qijia Li, Qian Wang, Hui Zhang, Wei Shi, Hongquan Gan, Huiping Song, Zhiqiang Wang
Fast and stable repair of segmental bone defects remains a challenge for clinical orthopedic surgery. In recent years, porous tantalum has been widely applied in clinical orthopedics for low modulus of elasticity, with three-dimensional microstructures similar to cancellous bone and excellent biocompatibility. To further improve bone the repairing ability of porous tantalum, the cyclo(-RGDfK-) peptide was coated on the surface of porous tantalum scaffolds. A model of 15 mm segmental defect was made at the midshaft of right radius in New Zealand White rabbits...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28181101/preparation-of-hydroxyapatite-collagen-injectable-bone-paste-with-an-anti-washout-property-utilizing-sodium-alginate-part-1-influences-of-excess-supplementation-of-calcium-compounds
#19
Taira Sato, Masanori Kikuchi, Mamoru Aizawa
The anti-washout property, viscosity, and cytocompatibility to an osteoblastic cell line, MG-63, of anti-washout pastes were investigated. Mixing a hydroxyapatite/collagen bone-like nanocomposite (HAp/Col), an aqueous solution of sodium alginate (Na-Alg), which is a paste hardening and lubricant agent, and supplementation of calcium carbonate or calcium citrate (Ca-Cit) as a calcium resource for the hardening reaction realized an injectable bone paste. Adding Ca-Cit at a concentration greater than eight times the Ca(2+) ion concentration to Na-Alg improved the anti-washout property...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28176192/effect-of-the-up-front-heat-treatment-of-gelatin-particles-dispersed-in-calcium-phosphate-cements-on-the-in-vivo-material-resorption-and-concomitant-bone-formation
#20
Shoko Yamamoto, Yuta Matsushima, Yoshitaka Kanayama, Azusa Seki, Haruya Honda, Hidero Unuma, Yasuo Sakai
Calcium phosphate cements (CPCs), consisting of a mixture of calcium phosphate powders and setting liquid, have been widely used in orthopedic applications. One of the drawbacks of CPCs is their poor resorbability in the living body, which hinders substitution with natural bones. One of the strategies to facilitate the resorption of CPCs is the incorporation of bioresorbable or water-soluble pore-generating particles (porogens), such as gelatin, in the CPC matrices. In spite of numerous reports, however, little is known about the effect of the dissolution/resorption rate of the porogens on concomitant bone regeneration...
March 2017: Journal of Materials Science. Materials in Medicine
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