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Biodegradable scaffold

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https://www.readbyqxmd.com/read/29050027/new-preventive-approaches-part-ii-role-of-dentin-biomodifiers-in-caries-progression
#1
Ana K Bedran-Russo, Camila A Zamperini
Dental caries is the most prevalent infectious chronic disease in children and adults. With a globally aging population, new demands in the management of dental caries are awakened by the rampant increase in the incidence of dental root caries. Like crown caries, root caries requires bacterial driven tissue demineralization followed by the degradation of the extracellular dentin matrix. Due to the complex composition and ultrastructure, preventive strategies targeting the mineral phase of dentin are insufficient for managing the prevention and progression of root caries...
2017: Monographs in Oral Science
https://www.readbyqxmd.com/read/29048241/nanofibrous-electrospun-hdecm-based-hybrid-scaffold-as-wound-dressing-for-reducing-scarring
#2
Tae Hee Kim, Youngmee Jung, Soo Hyun Kim
Produced via electrospinning, poly(l-lactide-co-caprolactone) (PLCL) membranes, which have a porous structure and are biodegradable, are of interest in various medical fields. The porous-structured electrospun membrane is particularly interesting because of several favorable properties: it exudes fluid from the wound, does not build up under the wound covering, and does not cause wound desiccation. Moreover, extracellular matrix (ECM)-based structures derived by tissue decellularization have application as engineered tissue scaffolds and as supports for cellular regeneration...
October 19, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29046717/designing-of-pla-scaffolds-for-bone-tissue-replacement-fabricated-by-ordinary-commercial-3d-printer
#3
Aleš Gregor, Eva Filová, Martin Novák, Jakub Kronek, Hynek Chlup, Matěj Buzgo, Veronika Blahnová, Věra Lukášová, Martin Bartoš, Alois Nečas, Jan Hošek
BACKGROUND: The primary objective of Tissue engineering is a regeneration or replacement of tissues or organs damaged by disease, injury, or congenital anomalies. At present, Tissue engineering repairs damaged tissues and organs with artificial supporting structures called scaffolds. These are used for attachment and subsequent growth of appropriate cells. During the cell growth gradual biodegradation of the scaffold occurs and the final product is a new tissue with the desired shape and properties...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/29033836/delivery-of-antioxidant-and-anti-inflammatory-agents-for-tissue-engineered-vascular-grafts
#4
REVIEW
Kenyatta S Washington, Chris A Bashur
The treatment of patients with severe coronary and peripheral artery disease represents a significant clinical need, especially for those patients that require a bypass graft and do not have viable veins for autologous grafting. Tissue engineering is being investigated to generate an alternative graft. While tissue engineering requires surgical intervention, the release of pharmacological agents is also an important part of many tissue engineering strategies. Delivery of these agents offers the potential to overcome the major concerns for graft patency and viability...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29030197/green-synthesis-of-degradable-conductive-thermosensitive-oligopyrrole-chitosan-hydrogel-intended-for-cartilage-tissue-engineering
#5
Mana Kashi, Fatemeh Baghbani, Fathollah Moztarzadeh, Hamid Mobasheri, Elaheh Kowsari
Electroactive scaffolds containing conductive polymers can promote tissue repair and regeneration. However, these polymers are non-degradable and cannot be removed from body. To overcome this limitation of conductive polymers, we developed a novel injectable electroactive hydrogel containing pyrrole oligomers which possessed the unique properties of being both electrically conductive and biodegradable. First, pyrrole oligomers were synthesized via chemical polymerization and were found to be amorphous with a non-globular morphology...
October 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29026645/synthesis-and-characterization-of-collagen-plga-biodegradable-skin-scaffold-fibers
#6
Alireza Sadeghi-Avalshahr, Samira Nokhasteh, Amir Mahdi Molavi, Mohammad Khorsand-Ghayeni, Meysam Mahdavi-Shahri
The aim of this study is to investigate the applicability of poly(lactic-co-glycolic acid) (PLGA)/collagen composite scaffold for skin tissue engineering. PLGA and collagen were dissolved in HFIP as a common solvent and fibrous scaffolds were prepared by electrospinning method. The scaffolds were characterized by scanning electron microscopy (SEM), FTIR spectroscopy, mercury porosimetry, tensile strength, biocompatibility assays and Biodegradation. Cytotoxicity and cell adhesion were tested for two cell line groups, human dermal fibroblast (HDF) and human keratinocyte (HaCat)...
October 2017: Regenerative Biomaterials
https://www.readbyqxmd.com/read/29025666/comprehensive-assessment-of-electrospun-scaffolds-hemocompatibility
#7
Jana Horakova, Petr Mikes, Ales Saman, Tereza Svarcova, Vera Jencova, Tomas Suchy, Bohdana Heczkova, Sarka Jakubkova, Jaroslava Jirousova, Renata Prochazkova
Biodegradable polyesters, namely polycaprolactone (PCL) and copolymer of polylactide and polycaprolactone (PLCL) were electrospun into various fibrous structures and their hemocompatibility was evaluated in vitro. Firstly, hemolytic effect was evaluated upon incubation with diluted whole blood. The results showed that the degree of hemolysis depended on chemical composition and fibrous morphology. Electrospun polycaprolactone induced slight degree of hemolysis depending on its molecular weight and fibrous morphology; copolymer PLCL did not cause detectable hemolysis...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29025660/electrospun-carboxyl-multi-walled-carbon-nanotubes-grafted-polyhydroxybutyrate-composite-nanofibers-membrane-scaffolds-preparation-characterization-and-cytocompatibility
#8
Cai Zhijiang, Zhu Cong, Guo Jie, Zhang Qing, Zhao Kongyin
Electrospun polyhydroxybutyrate (PHB)/carboxyl multi-walled carbon nanotubes grafted polyhydroxybutyrate (CMWCNT-g-PHB) composite nanofibers scaffolds were fabricated by electrospinning technology. The grafted product CMWCNT-g-PHB was prepared by condensation reactions between the carboxyl groups of CMWCNT and hydroxyl groups of PHB molecules and characterized by FTIR, XRD, XPS, TG and TEM measurements. The surface morphology, hydrophilicity and tensile mechanical properties of the electrospun PHB/CMWCNT-g-PHB composite nanofibers membrane scaffolds were investigated...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29025640/fabrication-and-preliminary-study-of-a-biomimetic-tri-layer-tubular-graft-based-on-fibers-and-fiber-yarns-for-vascular-tissue-engineering
#9
Tong Wu, Jialing Zhang, Yuanfei Wang, Dandan Li, Binbin Sun, Hany El-Hamshary, Meng Yin, Xiumei Mo
Designing a biomimetic and functional tissue-engineered vascular graft has been urgently needed for repairing and regenerating defected vascular tissues. Utilizing a multi-layered vascular scaffold is commonly considered an effective way, because multi-layered scaffolds can easily simulate the structure and function of natural blood vessels. Herein, we developed a novel tri-layer tubular graft consisted of Poly(L-lactide-co-caprolactone)/collagen (PLCL/COL) fibers and Poly(lactide-co-glycolide)/silk fibroin (PLGA/SF) yarns via a three-step electrospinning method...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29023390/electrospun-zein-gelatin-scaffold-enhanced-cell-attachment-and-growth-of-human-periodontal-ligament-stem-cells
#10
Fanqiao Yang, Yingling Miao, Yan Wang, Li-Ming Zhang, Xuefeng Lin
Periodontitis is a widespread dental disease affecting 10 to 15% of worldwide adult population, yet the current treatments are far from satisfactory. The human periodontal ligament stem cell is a promising potential seed cell population type in cell-based therapy and tissue regeneration, which require appropriate scaffold to provide a mimic extracellular matrix. Zein, a native protein derived from corn, has an excellent biodegradability, and therefore becomes a hotspot on research and application in the field of biomaterials...
October 12, 2017: Materials
https://www.readbyqxmd.com/read/29022190/in-vivo-study-of-a-bioactive-nanoparticle-gelatin-composite-scaffold-for-bone-defect-repair-in-rabbits
#11
Guojin Hou, Fang Zhou, Yan Guo, Zhongwei Yang, Ailing Li, Chen Wang, Dong Qiu
The purpose is to study the in vivo bioactivity of this scaffold and verify its ability to simulate the characteristics of cancellous bone. Twenty-four adult New Zealand white rabbits were divided into three groups. Bone defects above the femoral condylar of both sides were created. A newly designed bioactive nanoparticle-gelatin composite scaffold was implanted to the experimental side, while the control side was left without implantation. The repair of bone defect was monitored by X-ray examination, gross observation, Micro-CT examination and histological observation of the area of bone defect 4, 8 and 12 weeks after surgery...
October 11, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29020300/impact-of-design-of-coronary-stents-and-length-of-dual-antiplatelet-therapies-on-ischaemic-and-bleeding-events-a-network-meta-analysis-of-64-randomized-controlled-trials-and-102%C3%A2-735-patients
#12
Fabrizio D'Ascenzo, Mario Iannaccone, Gaelle Saint-Hilary, Maurizio Bertaina, Stefanie Schulz-Schüpke, Cheol Wahn Lee, Alaide Chieffo, Gerard Helft, Sebastiano Gili, Umberto Barbero, Giuseppe Biondi Zoccai, Claudio Moretti, Fabrizio Ugo, Maurizio D'Amico, Roberto Garbo, Gregg Stone, Sara Rettegno, Pierluigi Omedè, Federico Conrotto, Christian Templin, Antonio Colombo, Seung-Jung Park, Adnan Kastrati, David Hildick-Smith, Mauro Gasparini, Fiorenzo Gaita
Aims: The differential impact on ischaemic and bleeding events of the type of drug-eluting stent [durable polymer stents [DES] vs. biodegradable polymer stents vs. bioresorbable scaffolds (BRS)] and length of dual antiplatelet therapy (DAPT) remains to be defined. Methods and results: Randomized controlled trials comparing different types of DES and/or DAPT durations were selected. The primary endpoint was Major Adverse Cardiovascular Events (MACE) [a composite of death, myocardial infarction (MI), and target vessel revascularization]...
August 11, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28992503/the-effect-of-operational-parameters-on-the-biodegradation-of-bisphenols-by-trametes-versicolor-laccase-immobilized-on-hippospongia-communis-spongin-scaffolds
#13
Jakub Zdarta, Katarzyna Antecka, Robert Frankowski, Agnieszka Zgoła-Grześkowiak, Hermann Ehrlich, Teofil Jesionowski
Due to the rapid growth in quantities of phenolic compounds in wastewater, the development of efficient and environmentally friendly methods for their removal becomes a necessity. Thus, in a presented work, for the first time, a novel material, Hippospongia communis spongin-based scaffold, was used as a biopolymeric support for the immobilization of laccase from Trametes versicolor. The resulting biocatalytic systems were used for the biodegradation of three bisphenols: bisphenol A (BPA), bisphenol F (BPF) and bioremoval-resistant bisphenol S (BPS)...
October 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28990762/multichanneled-nerve-guidance-conduit-with-spatial-gradients-of-neurotrophic-factors-and-oriented-nanotopography-for-repairing-the-peripheral-nervous-system
#14
Yo-Cheng Chang, Ming-Hong Chen, Shih-Yung Liao, Hsi-Chin Wu, Chen-Hsiang Kuan, Jui-Sheng Sun, Tzu-Wei Wang
Peripheral nerve injuries, causing sensory and motor impairment, affect a great number of patients annually. It is therefore important to incorporate different strategies to promote nerve healing. Among the treatment options, however, the efficacy of nerve conduits is often compromised by their lack of living cells, insufficient growth factors, and absence of the extracellular matrix (ECM)-like structure. To improve the functional recovery, we aimed to develop a natural biodegradable multichanneled scaffold characterized with aligned electrospun nanofibers and neurotrophic gradient (MC/AN/NG) to guide axon outgrowth...
October 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28980527/comparison-of-plasma-and-chemical-modifications-of-poly-l-lactide-co-caprolactone-scaffolds-for-heparin-conjugation
#15
Yu-Fang Hsieh, Khoren Sahagian, Fang Huang, Kang Xu, Shyam Patel, Song Li
Biodegradable polymers have potential as a scaffold material for making small diameter artery bypass grafts. To resist thrombosis, maintain biocompatibility and enhance the remodeling of the grafts, it is crucial to modify polymer scaffolds so that the grafts have antithrombogenic capacity and allow cell infiltration. In this study, two methods of aminolysis on electrospun poly-L-lactide-co-caprolactone (PLCL) microfiber vascular grafts are compared: plasma treatment method and Fmoc-PEG-diamine insertion method...
October 5, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28972200/fibrinogen-modified-sodium-alginate-as-a-scaffold-material-for-skin-tissue-engineering
#16
Elena V Solovieva, Alexander Yu Fedotov, Vasily E Mamonov, Vladimir S Komlev, Andrey A Panteleyev
In search for a new pro-angiogenic scaffold material suitable for skin bioengineering and grafting therapy, we have fabricated a number of composite sodium alginate (AG) - fibrinogen (FG) sponge scaffolds using the freeze-drying approach. Thrombin was added to drive FG/fibrin conversion, while ε-aminocapronic acid (εAc) was used as antifibrinolytic component. The slow rates of scaffold biodegradation were achieved by using Ca2+ and Mg2+ cations as cross-linking agents. The novel thrombin-modified AG-FG scaffolds with highly interconnected porous structure were evaluated using scanning electron microscopy, tensile testing and pycnometric analysis...
October 3, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28962789/the-effect-of-hpmc-and-mc-as-pore-formers-on-the-rheology-of-the-implant-microenvironment-and-the-drug-release-in-vitro
#17
Johanna Aho, Amanda Halme, Johan Boetker, Jorrit Jeroen Water, Adam Bohr, Niklas Sandler, Jukka Rantanen, Stefania Baldursdottir
Porous implants or implantable scaffolds used for tissue regeneration can encourage tissue growth inside the implant and provide extended drug release. Water-soluble polymers incorporated into a biodegradable or inert implant matrix may leach out upon contact with biological fluids and thereby gradually increasing the porosity of the implant and simultaneously release drug from the implant matrix. Different molecular weight grades of methylcellulose (MC) and hydroxypropyl methylcellulose (HPMC) were mixed with polylactide and extruded into model implants containing nitrofurantoin as a model drug...
December 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28962760/design-and-fabrication-of-porous-chitosan-scaffolds-with-tunable-structures-and-mechanical-properties
#18
Yongxiang Xu, Dandan Xia, Jianmin Han, Shenpo Yuan, Hong Lin, Chao Zhao
Chitosan-based porous scaffolds are of great interest in biomedical applications because of their biodegradability and biocompatibility. However, the poor mechanical properties of these scaffolds hinder their broad utility. In the present study, a novel compression method was developed to fabricate chitosan scaffolds with high mechanical strength and tuneable topography, based on the ionic strength and pH-dependent solubility of chitosan. When the compressive ratio increases from 1 to 8, the compressive elastic modulus of the scaffold increases from 5...
December 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28961518/modulus-of-elasticity-of-randomly-and-aligned-polymeric-scaffolds-with-fiber-size-dependency
#19
Jun Wang, Bo Yuan, Ray P S Han
The stiffness of a nano-fibrous scaffold is generally enhanced due to the size-dependency of the thin nanofibers contained in the scaffold. We proposed a model that incorporates size-dependency of single nanofibers to predict the scaffold effective modulus, in which the fibers' random or orientation distribution are considered. In the model the fiber segments between rigid fiber-fiber bonds can be stretching, shearing and bending. Using deformation energy equilibrium between sum of individual fibers and the plate of nano-fibrous scaffold, the scaffold effective modulus was derived explicitly...
September 20, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28956678/preparation-and-characterization-of-polycaprolactone-polyethylene-glycol-methyl-ether-and-polycaprolactone-chitosan-electrospun-mats-potential-for-vascular-tissue-engineering
#20
Tamanna Sultana, Jhaleh Amirian, Chanmi Park, Seung Jin Lee, Byong-Taek Lee
Recently, natural polymers are frequently comingled with synthetic polymers either by physical or chemical modification to prepare numerous tissue-engineered graft with promising biological function, strength, and stability. The aim of this study was to determine the efficiency for vascular tissue engineering of two distinctly different mats, one that comprised polycaprolactone-polyethylene glycol methyl ether and other that comprised polycaprolactone-chitosan. Nano/microfibrous mats prepared from electro-spinning were characterized for fiber diameter, porosity, wettability, and mechanical strength...
January 1, 2017: Journal of Biomaterials Applications
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