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Biomechanical engineering

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https://www.readbyqxmd.com/read/28445366/biomechanical-integrity-in-craniofacial-surgery-calvarial-reconstruction-in-favorable-and-infected-defects-with-bone-morphogenetic-protein-2
#1
Zoe M MacIsaac, Sarah E Henderson, Sameer Shakir, Sanjay Naran, Darren M Smith, Liliana Camison, James J Cray, Alejandro J Almarza, Gregory M Cooper, Joseph E Losee
BACKGROUND: The limitations of autologous and alloplastic reconstruction for craniofacial bone defects have created a clinical need for viable tissue-engineering strategies. Recombinant human bone morphogenetic protein-2 (rhBMP-2) has shown promise in this setting. The aim of this study was to determine the long-term biomechanical properties of rhBMP-2-mediated calvarial reconstruction. METHODS: Twelve-week-old New Zealand White rabbits underwent subtotal calvarectomy...
May 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28432818/characterization-of-decellularized-ovine-small-intestine-submucosal-layer-as-extracellular-matrix-based-scaffold-for-tissue-engineering
#2
Morteza Rashtbar, Jamshid Hadjati, Jafar Ai, Issa Jahanzad, Mahmoud Azami, Sadegh Shirian, Somayeh Ebrahimi-Barough, Esmaeil Sadroddiny
Extracellular matrix-based scaffolds derived from mammalian tissues have been used in tissue engineering applications. Among all the tissues, decellularized small intestine submucosal layer (SIS) has been recently investigated for its exceptional characteristics and biocompatibilities. These investigations have been mainly focused on the decellularized porcine SIS; however, there has not been any report on ovine SIS (OSIS) layer. In this study, OSIS was decellularized and its physical, chemical, and morphological properties were evaluated...
April 22, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28425209/identification-of-dynamic-load-for-prosthetic-structures
#3
Dequan Zhang, Xu Han, Zhongpu Zhang, Jie Liu, Chao Jiang, Nobuhiro Yoda, Xianghua Meng, Qing Li
Dynamic load exists in numerous biomechanical systems and its identification signifies a critical issue for characterizing dynamic behaviors and studying biomechanical consequence of the systems. This study aims to identify dynamic load in the dental prosthetic structures, namely three-unit implant-supported fixed partial denture (I-FPD) and teeth-supported fixed partial denture (T-FPD). The three-dimensional (3D) finite element (FE) models were constructed through patient's computerized tomography (CT) images...
April 20, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28380080/biodegradable-poly-lactic-acid-co-glycolic-acid-scaffolds-as-carriers-for-genetically-modified-fibroblasts
#4
Tatjana Perisic, Ziyang Zhang, Peter Foehr, Ursula Hopfner, Kathrin Klutz, Rainer H Burgkart, Alexei Slobodianski, Moritz Goeldner, Hans-Günther Machens, Arndt F Schilling
Recent advances in gene delivery into cells allow improved therapeutic effects in gene therapy trials. To increase the bioavailability of applied cells, it is of great interest that transfected cells remain at the application site and systemic spread is minimized. In this study, we tested clinically used biodegradable poly(lactic acid-co-glycolic acid) (PLGA) scaffolds (Vicryl & Ethisorb) as transient carriers for genetically modified cells. To this aim, we used human fibroblasts and examined attachment and proliferation of untransfected cells on the scaffolds in vitro, as well as the mechanical properties of the scaffolds at four time points (1, 3, 6 and 9 days) of cultivation...
2017: PloS One
https://www.readbyqxmd.com/read/28376803/characterization-of-biomechanical-properties-of-cells-through-dielectrophoresis-based-cell-stretching-and-actin-cytoskeleton-modeling
#5
Guohua Bai, Ying Li, Henry K Chu, Kaiqun Wang, Qiulin Tan, Jijun Xiong, Dong Sun
BACKGROUND: Cytoskeleton is a highly dynamic network that helps to maintain the rigidity of a cell, and the mechanical properties of a cell are closely related to many cellular functions. This paper presents a new method to probe and characterize cell mechanical properties through dielectrophoresis (DEP)-based cell stretching manipulation and actin cytoskeleton modeling. METHODS: Leukemia NB4 cells were used as cell line, and changes in their biological properties were examined after chemotherapy treatment with doxorubicin (DOX)...
April 4, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28374682/biofabricated-soft-network-composites-for-cartilage-tissue-engineering
#6
Onur Bas, Elena De-Juan-Pardo, Christoph Meinert, Davide D'Angella, Jeremy Baldwin, Laura Bray, R Wellard, Stefan Kollmannsberger, Ernst Rank, Carsten Werner, Travis Klein, Isabelle Catelas, Dietmar Werner Hutmacher
Articular cartilage from a material science point of view is a soft network composite that plays a critical role in load-bearing joints during dynamic loading. Its composite structure, consisting of a collagen fiber network and a hydrated proteoglycan matrix, gives rise to the complex mechanical properties of the tissue including viscoelasticity and stress relaxation. Melt Electrospinning Writing (MEW) allows the design and fabrication of medical grade polycaprolactone (mPCL) fibrous networks for the reinforcement of soft hydrogel matrices for cartilage tissue engineering...
April 4, 2017: Biofabrication
https://www.readbyqxmd.com/read/28364144/current-advances-in-the-development-of-natural-meniscus-scaffolds-innovative-approaches-to-decellularization-and-recellularization
#7
REVIEW
Yunbin Chen, Jiaxin Chen, Zeng Zhang, Kangliang Lou, Qi Zhang, Shengyu Wang, Jinhu Ni, Wenyue Liu, Shunwu Fan, Xianfeng Lin
The increasing rate of injuries to the meniscus indicates the urgent need to develop effective repair strategies. Irreparably damaged menisci can be replaced and meniscus allografts represent the treatment of choice; however, they have several limitations, including availability and compatibility. Another approach is the use of artificial implants but their chondroprotective activities are still not proved clinically. In this situation, tissue engineering offers alternative natural decellularized extracellular matrix (ECM) scaffolds, which have shown biomechanical properties comparable to those of native menisci and are characterized by low immunogenicity and promising regenerative potential...
March 31, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28363521/effectiveness-of-tissue-engineered-chitosan-gelatin-composite-scaffold-loaded-with-human-platelet-gel-in-regeneration-of-critical-sized-radial-bone-defect-in-rat
#8
Ahmad Oryan, Soodeh Alidadi, Amin Bigham-Sadegh, Ali Moshiri, Amir Kamali
Although many strategies have been utilized to accelerate bone regeneration, an appropriate treatment strategy to regenerate a new bone with optimum morphology and mechanical properties has not been invented as yet. This study investigated the healing potential of a composite scaffold consisting of chitosan (CS), gelatin (Gel) and platelet gel (PG), named CS-Gel-PG, on a bilateral critical sized radial bone defect in rat. Eighty radial bone defects were bilaterally created in 40 Sprague-Dawley rats and were randomly divided into eight groups including untreated, autograft, CS, Gel, CS-PG, Gel-PG, CS-Gel, and CS-Gel-PG treated defects...
March 29, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28355098/meniscus-beyond-mechanics-using-biology-to-advance-our-understanding-of-meniscus-injury-and-treatment
#9
Muhammad Farooq Rai, Amy L McNulty
Meniscus tissues were historically considered vestigial structures in the knee, and largely remained an unexplored and underappreciated area of research. However, this concept was refuted with the discovery that loss of meniscus tissue leads to joint degeneration and development of osteoarthritis (OA). These findings have led to a growing interest in the role of the meniscus in knee stability and joint health and have brought the meniscus to the forefront of orthopaedic research. While the critical role of the meniscus in joint health has been established, little is known about the biomechanical, biochemical, and molecular signaling pathways that are involved in meniscus homeostasis and pathogenesis...
March 29, 2017: Connective Tissue Research
https://www.readbyqxmd.com/read/28345593/microstructural-tissue-engineering-in-the-rachis-and-barbs-of-bird-feathers
#10
Theagarten Lingham-Soliar
Feathers do not have to be especially strong but they do need to be stiff and at the same time resilient and to have a high work of fracture. Syncitial barbule fibres are the highest size-class of continuous filaments in the cortex of the rachis of the feather. However, the rachis can be treated as a generalized cone of rapidly diminishing volume. This means that hundreds of syncitial barbule fibres of the rachis may have to be terminated before reaching the tip - creating potentially thousands of inherently fatal crack-like defects...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28343746/preliminary-development-of-an-advanced-modular-pressure-relief-cushion-testing-and-user-evaluation
#11
Tyler Freeto, Steven J Mitchell, Kath M Bogie
STUDY AIM: Effective pressure relief cushions are identified as a core assistive technology need by the World Health Organization Global Cooperation on Assistive Technology. High quality affordable wheelchair cushions could provide effective pressure relief for many individuals with limited access to advanced assistive technology. MATERIALS: Value driven engineering (VdE) principles were employed to develop a prototype modular cushion. Low cost dynamically responsive gel balls were arranged in a close packed array and seated in bilayer foam for containment and support...
March 20, 2017: Journal of Tissue Viability
https://www.readbyqxmd.com/read/28342099/optimized-decellularization-protocol-including-%C3%AE-gal-epitope-reduction-for-fabrication-of-an-acellular-porcine-annulus-fibrosus-scaffold
#12
Lien-Chen Wu, Yi-Jie Kuo, Fu-Wen Sun, Chia-Hsien Chen, Chang-Jung Chiang, Pei-Wei Weng, Yang-Hwei Tsuang, Yi-You Huang
Recent advances in tissue engineering have led to potential new strategies, especially decellularization protocols from natural tissues, for the repair, replacement, and regeneration of intervertebral discs. This study aimed to validate our previously reported method for the decellularization of annulus fibrosus (AF) tissue and to quantify potentially antigenic α-Gal epitopes in the decellularized tissue. Porcine AF tissue was decellularized using different freeze-thaw temperatures, chemical detergents, and incubation times in order to determine the optimal method for cell removal...
March 24, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28341826/poly-ethylmethacrylate-co-diethylaminoethyl-acrylate-coating-improves-endothelial-re-population-bio-mechanical-and-anti-thrombogenic-properties-of-decellularized-carotid-arteries-for-blood-vessel-replacement
#13
Elena López-Ruiz, Seshasailam Venkateswaran, Macarena Perán, Gema Jiménez, Salvatore Pernagallo, Juan J Díaz-Mochón, Olga Tura-Ceide, Francisco Arrebola, Juan Melchor, Juan Soto, Guillermo Rus, Pedro J Real, María Diaz-Ricart, Antonio Conde-González, Mark Bradley, Juan A Marchal
Decellularized vascular scaffolds are promising materials for vessel replacements. However, despite the natural origin of decellularized vessels, issues such as biomechanical incompatibility, immunogenicity risks and the hazards of thrombus formation, still need to be addressed. In this study, we coated decellularized vessels obtained from porcine carotid arteries with poly (ethylmethacrylate-co-diethylaminoethylacrylate) (8g7) with the purpose of improving endothelial coverage and minimizing platelet attachment while enhancing the mechanical properties of the decellularized vascular scaffolds...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338419/competitive-protein-binding-influences-heparin-based-modulation-of-spatial-growth-factor-delivery-for-bone-regeneration
#14
Marian H Hettiaratchi, Catherine Chou, Nicholas Servies, Johanna M Smeekens, Albert Cheng, Camden Esancy, Ronghu Wu, Todd C McDevitt, Robert E Guldberg, Laxminarayanan Krishnan
Tissue engineering strategies involving the in vivo delivery of recombinant growth factors are often limited by the inability of biomaterials to spatially control diffusion of the delivered protein within the site of interest. The poor spatiotemporal control provided by porous collagen sponges, which are used for the clinical delivery of bone morphogenetic protein-2 (BMP-2) for bone regeneration, has necessitated the use of supraphysiological protein doses, leading to inflammation and heterotopic ossification...
March 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28329028/non-equilibrium-assembly-of-microtubules-from-molecules-to-autonomous-chemical-robots
#15
REVIEW
H Hess, Jennifer L Ross
Biological systems have evolved to harness non-equilibrium processes from the molecular to the macro scale. It is currently a grand challenge of chemistry, materials science, and engineering to understand and mimic biological systems that have the ability to autonomously sense stimuli, process these inputs, and respond by performing mechanical work. New chemical systems are responding to the challenge and form the basis for future responsive, adaptive, and active materials. In this article, we describe a particular biochemical-biomechanical network based on the microtubule cytoskeletal filament - itself a non-equilibrium chemical system...
March 22, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28326347/the-insufficiencies-of-risk-analysis-of-impending-pathological-fractures-in-patients-with-femoral-metastases-a-literature-review
#16
Emir Benca, Janina M Patsch, Winfried Mayr, Dieter H Pahr, Reinhard Windhager
PURPOSE: Pathologic fractures in patients with bone metastases are a common problem in clinical orthopaedic routine. On one hand recognition of metastatic lesions, which are at a high risk of fracture, is essential for timely prophylactic fixation, while on the other hand patients with a low risk of pathologic fractures should be spared from overtreatment. The purpose of this review is to identify all methods for fracture risk evaluation in patients with femoral metastases in the literature and to evaluate their predictive values in clinical applications...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28314563/a-biomechanical-approach-to-the-analysis-of-methods-and-procedures-of-bariatric-surgery
#17
Emanuele Luigi Carniel, Alessandro Frigo, Chiara Giulia Fontanella, Giulia Maria De Benedictis, Alessandro Rubini, Luca Barp, Gioela Pluchino, Beatrice Sabbadini, Lino Polese
Bariatric surgery includes a variety of procedures that are performed on obese people and aim at decreasing the intake of food and calories. This goal is usually pursued by reducing stomach capacity and/or absorbing capability. Adjustable gastric banding is the most common and successful operation. In general, bariatric surgical procedures are effective, but are often associated with major complications. Surgical procedure and post-surgical conformation of the stomach are usually defined on clinical and surgical basis only...
March 4, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28303237/the-effect-of-biomechanical-stimulation-on-osteoblast-differentiation-of-human-jaw-periosteum-derived-stem-cells
#18
Ju-Min Lee, Min-Gu Kim, June-Ho Byun, Gyoo-Cheon Kim, Jung-Hoon Ro, Dae-Seok Hwang, Byul-Bora Choi, Geun-Chul Park, Uk-Kyu Kim
BACKGROUND: This study was to investigate the effect of biomechanical stimulation on osteoblast differentiation of human periosteal-derived stem cell using the newly developed bioreactor. METHODS: Human periosteal-derived stem cells were harvested from the mandible during the extraction of an impacted third molar. Using the new bioreactor, 4% cyclic equibiaxial tension force (0.5 Hz) was applied for 2 and 8 h on the stem cells and cultured for 3, 7, and 14 days on the osteogenic medium...
December 2017: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28294563/a-new-material-for-tissue-engineered-vagina-reconstruction-acellular-porcine-vagina-matrix
#19
Jing-Kun Zhang, Run-Xuan Du, Lin Zhang, Ya-Nan Li, Ming-Le Zhang, Shuo Zhao, Xiang-Hua Huang, Yan-Fang Xu
Acellular matrix materials have been widely used to repair various tissues and organs. According to the plastic principle, when a part of the body is lost, it should be replaced with a similar material. Therefore, the use of a homologous organ-specific acellular vaginal tissue in vagina reconstruction repair surgery may show good results. However, the acellular vagina matrix (AVM) form large vertebrates is difficult to isolate. In this study, we described a multistep method to prepare porcine AVM and evaluated the efficacy of acellularization...
March 10, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28294398/functional-properties-of-native-and-tissue-engineered-cartilage-toward-understanding-the-pathogenesis-of-chondral-lesions-at-the-knee-a-bovine-cadaveric-study
#20
Nikolaos K Paschos, Nikita Lim, Jerry C Hu, Kyriacos A Athanasiou
Chondral lesions frequently occur in different topographic locations of the knee. This study evaluated the functional properties among the articulating surfaces of the tibiofemoral and patellofemoral joints, and whether neo-cartilage engineered using chondrocytes from different knee locations would reflect these differences. The biomechanical properties of bovine cartilage isolated from eight locations within the tibiofemoral (medial and lateral condyle, medial and lateral tibial plateau) and patellofemoral joints (medial and lateral trochlea, medial and lateral patella) were examined...
March 10, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
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