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Ceramics

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https://www.readbyqxmd.com/read/28532098/mechanical-behavior-of-yttria-stabilized-tetragonal-zirconia-polycrystalline-ceramic-after-different-zirconia-surface-treatments
#1
Joao Luiz Pozzobon, Gabriel Kalil Rocha Pereira, Vinicius Felipe Wandscher, Lucio Strazzabosco Dorneles, Luiz Felipe Valandro
This study investigated the effects of different zirconia surface conditioning methods on the biaxial flexure strength, surface characteristics and fractographic analysis of a Y-TZP ceramic. Disc-shaped specimens were manufactured according to ISO 6872-2008 for biaxial flexure strength testing, and then randomly assigned into seven groups (n=30). Control (CTRL): without treatment; Tribochemical silica coating (TBS): specimens were sandblasted with silica-coated aluminum oxide particles (CoJet-Sand) for 10s; Silica nanofilm (SNF): specimens were silica coated with a 5nm SiO2 nanofilm; and four protocols of low-fusing porcelain glaze (GLZ): etching with 10% hydrofluoric acid gel (HF) for 1min (GLZ1), 5min (GLZ5), 10min (GLZ10) and 15min (GLZ15)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532056/stiff-porous-scaffolds-from-magnetized-alumina-particles-aligned-by-magnetic-freeze-casting
#2
Michael B Frank, Steven E Naleway, Tsuk Haroush, Chin-Hung Liu, Sze Hei Siu, Jerry Ng, Ivan Torres, Ali Ismail, Keyur Karandikar, Michael M Porter, Olivia A Graeve, Joanna McKittrick
Bone consists of a hard mineral phase and a compliant biopolymer phase resulting in a composite material that is both lightweight and strong. Osteoporosis that degrades spongy bone preferentially over time leads to bone brittleness in the elderly. A porous ceramic material that can mimic spongy bone for a one-time implant provides a potential solution for the future needs of an aging population. Scaffolds made by magnetic freeze casting resemble the aligned porosity of spongy bone. A magnetic field applied throughout freezing induces particle chaining and alignment of lamellae structures between growing ice crystals...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532039/bioactivity-mechanical-properties-and-drug-delivery-ability-of-bioactive-glass-ceramic-scaffolds-coated-with-a-natural-derived-polymer
#3
M Araújo, R Viveiros, A Philippart, M Miola, S Doumett, G Baldi, J Perez, A R Boccaccini, A Aguiar-Ricardo, E Verné
In this work, hybrid melanin-coated bioactive glass-ceramic multifunctional scaffolds were developed and characterized in terms of mechanical strength, in vitro bioactivity in simulated body fluid (SBF) and ability to load ibuprofen. The coated scaffolds exhibited an accelerated bioactivity in comparison with the uncoated ones, being able of developing hydroxyapatite-like crystals after 7days soaking in simulated body fluid (SBF). Besides its positive influence on the scaffolds bioactivity, the melanin coating was able to enhance their mechanical properties, increasing the initial compressive strength by a factor of >2...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532004/corrosion-and-surface-modification-on-biocompatible-metals-a-review
#4
REVIEW
R I M Asri, W S W Harun, M Samykano, N A C Lah, S A C Ghani, F Tarlochan, M R Raza
Corrosion prevention in biomaterials has become crucial particularly to overcome inflammation and allergic reactions caused by the biomaterials' implants towards the human body. When these metal implants contacted with fluidic environments such as bloodstream and tissue of the body, most of them became mutually highly antagonistic and subsequently promotes corrosion. Biocompatible implants are typically made up of metallic, ceramic, composite and polymers. The present paper specifically focuses on biocompatible metals which favorably used as implants such as 316L stainless steel, cobalt-chromium-molybdenum, pure titanium and titanium-based alloys...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531647/multifunctional-plla-ceramic-fiber-membranes-for-bone-regeneration-applications
#5
Daniel Santos, Dina M Silva, Pedro S Gomes, Maria H Fernandes, José D Santos, Vitor Sencadas
A novel method to process electrospun poly(l-lactic acid) (PLLA) membranes incorporating glass reinforced hydroxyapatite granules (gHA) interspacially between the polymeric fibers is reported, thus increasing the surface area for cellular interactions. gHA granules (≤150μm) electrospun together with the polymer solution, lead to an average fiber diameter of 550±150nm for pristine PLLA and 440±170nm for the composite samples. An increase of the overall porosity was observed, from 79±3% for the PLLA up to 88±5% for the hybrid samples, keeping material's wettability and mechanical properties...
May 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28530207/fabrication-of-biomimetic-bone-grafts-with-multi-material-3d-printing
#6
Nicholas Sears, Prachi Dhavalikar, Michael Whitely, Elizabeth Cosgriff-Hernandez
Extrusion deposition is a versatile method for the 3D printing of biomaterials such as hydrogels, ceramics, and suspensions. Recently, a new class of emulsion inks were developed that can be used to create tunable, hierarchically porous materials with a cure-on-dispense method. Propylene fumarate dimethacrylate (PFDMA) was selected to fabricate bone grafts using this technology due to its established biocompatibility, osteoconductivity, and good compressive properties. Scaffolds fabricated from PFDMA emulsion inks displayed compressive modulus and yield strength of approximately 15 and 1 MPa, respectively...
May 22, 2017: Biofabrication
https://www.readbyqxmd.com/read/28529863/ceramic-biocomposites-as-biodegradable-antibiotic-carriers-in-the-treatment-of-bone-infections
#7
REVIEW
Jamie Ferguson, Michael Diefenbeck, Martin McNally
Local release of antibiotic has advantages in the treatment of chronic osteomyelitis and infected fractures. The adequacy of surgical debridement is still key to successful clearance of infection but local antibiotic carriers seem to afford greater success rates by targeting the residual organisms present after debridement and delivering much higher local antibiotic concentrations compared with systemic antibiotics alone. Biodegradable ceramic carriers can be used to fill osseous defects, which reduces the dead space and provides the potential for subsequent repair of the osseous defect as they dissolve away...
2017: J Bone Jt Infect
https://www.readbyqxmd.com/read/28529464/trap-design-and-construction-for-high-power-multinuclear-magnetic-resonance-experiments
#8
Joseph V Rispoli, Ivan E Dimitrov, Sergey Cheshkov, Craig Malloy, Steven M Wright, Mary P McDougall
Performing multinuclear experiments requires one or more radiofrequency (RF) coils operating at both the proton and second-nucleus frequencies; however, inductive coupling between coils must be mitigated to retain proton sensitivity and coil tuning stability. The inclusion of trap circuits simplifies placement of multinuclear RF coils while maintaining inter-element isolation. Of the commonly investigated non-proton nuclei, perhaps the most technically demanding is carbon-13, particularly when applying a proton decoupling scheme to improve the resulting spectra...
October 2016: Concepts in Magnetic Resonance. Part B, Magnetic Resonance Engineering
https://www.readbyqxmd.com/read/28529109/late-dislocations-after-total-hip-arthroplasty-is-the-bearing-a-factor
#9
Siddharth M Shah, William L Walter, Stephen M Tai, Michelle F Lorimer, Richard N de Steiger
BACKGROUND: Dislocation is a leading cause of revision after primary total hip arthroplasty (THA). Although more common in the first few years after the procedure, dislocation can occur at any time. This study investigated the difference in late dislocation in ceramic-on-ceramic (CoC) bearings compared with metal-on-polyethylene and ceramic-on-polyethylene bearings in THA. METHODS: Data were used from the Australian Orthopaedic Association National Joint Replacement Registry, and the cumulative percent revision for dislocation was estimated using the Kaplan-Meier method for the different bearing surfaces...
April 27, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28528314/development-of-a-macroporous-ceramic-passive-sampler-for-the-monitoring-of-cytostatic-drugs-in-water
#10
Helena Franquet-Griell, Victor Pueyo, Jorge Silva, Victor M Orera, Silvia Lacorte
The aim of this study was to develop and calibrate a macroporous ceramic passive sampler (MCPS) for the monitoring of anticancer drugs in wastewater. This system was designed by the Spanish Research Council (CSIC) and consists in a porous ceramic tube to allow a high diffusion of contaminants. The MCPS has been calibrated for 16 cytostatic drugs over time periods up to 9 d in spiked water under controlled laboratory conditions. Optimal uptake was accomplished for 7 compounds, namely ifosfamide, cyclophosphamide, capecitabine, prednisone, megestrol, cyproterone and mycophenolic acid, whereas cytarabine was not adsorbed in the receiving phase and the rest were hydrolyzed over the deployment period...
May 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/28528283/poly-vinyl-alcohol-hydroxyapatite-monolithic-in-needle-extraction-mine-device-preparation-and-examination-of-drug-affinity
#11
Monika Pietrzyńska, Michał Czerwiński, Adam Voelkel
Polymer-ceramic materials based on poly(vinyl alcohol) (PVA) and hydroxyapatite were applied as sorption material in Monolithic In-Needle Extraction (MINE) device. The presented device provides new possibilities for the examination of bisphosphonates affinity for bone and will be a helpful tool in evaluation of potential antiresorptive drugs suitability. A ceramic part of monoliths was prepared by incorporation of hydroxyapatite (HA) into the reaction mixture or by using a soaking method (mineralization of HA on the PVA)...
May 17, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28528104/effect-of-egg-albumin-fining-progressive-clarification-and-cross-flow-microfiltration-on-the-polysaccharide-and-proanthocyanidin-composition-of-red-varietal-wines
#12
Leticia Martínez-Lapuente, Zenaida Guadalupe, Belén Ayestarán
The effect of egg albumin fining, progressive clarification and cross-flow microfiltration on the polysaccharide and proanthocyanidin composition of four red varietal wines was studied in this work. Discriminant analyses were applied to achieve a possible differentiation of the wines according to treatment or grape variety. Egg albumin fining did no produce a significant decrease in the content of wine polysaccharides. Progressive clarification caused a significant reduction of mannoproteins, homogalacturonans and polysaccharides rich in arabinose and galactose in Graciano wines...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28526443/mechanical-properties-of-polymer-infiltrated-ceramic-sodium-aluminum-silicate-composites-for-dental-restoration
#13
Bencang Cui, Jing Li, Huining Wang, Yuanhua Lin, Yang Shen, Ming Li, Xuliang Deng, Cewen Nan
OBJECTIVE: To fabricate indirect restorative composites for CAD/CAM applications and evaluate the mechanical properties. METHODS: Polymer-infiltrated-ceramic composites were prepared through infiltrating polymer into partially sintered sodium aluminum silicate ceramic blocks and curing. The corresponding samples were fabricated according to standard ISO-4049 using for mechanical properties measurement. The flexural strength and fracture toughness were measured using a mechanical property testing machine...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28524802/effects-of-occupational-silica-exposure-on-oxidative-stress-and-immune-system-parameters-in-ceramic-workers-in-turkey
#14
Hatice Gul Anlar, Merve Bacanli, Servet İritaş, Ceylan Bal, Türker Kurt, Engin Tutkun, O Hinc Yilmaz, Nursen Basaran
Silica is the second most common element after oxygen, and therefore, exposures to crystalline silica dust occur in a large variety of occupations such as metal foundries, constructions, and ceramic, quarry, and pottery industries. Since crystalline silica exposure has been linked with silicosis, lung cancer, and other pulmonary diseases, adverse effect attributed to this element has be a cause for concern worldwide. Silica dust exposure in workers is still considered to be important health problem especially in developing countries...
May 19, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28524243/bulk-filled-posterior-resin-restorations-based-on-stress-decreasing-resin-technology-a-randomized-controlled-6-year-evaluation
#15
Jan W V van Dijken, Ulla Pallesen
This randomized study evaluated a flowable resin composite bulk-fill technique in posterior restorations and compared it intraindividually with a conventional 2-mm resin composite layering technique over a 6-yr follow-up period. Thirty-eight pairs of Class II restorations and 15 pairs of Class I restorations were placed in 38 adults. In all cavities a single-step self-etch adhesive (Xeno V) was applied. In the first cavity of each pair, the flowable resin composite (SDR) was placed, in bulk increments of up to 4 mm...
May 19, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28521695/biomorphic-ceramics-for-drug-delivery-in-bone-tissue-regeneration
#16
Patricia Diaz-Rodriguez, Mariana Landin
Incorporating therapeutic molecules into biomorphic ceramics for in situ drug release can be used to generate novel systems for tissue regeneration. These systems couple the complex hierarchical porous structures of biomorphic ceramics with the therapeutic activity of drugs. There are a large number of natural precursors available to be used as templates to obtain biomorphic silicon carbide ceramics. Additionally, different drug loading techniques can be used for these systems. The high versatility in structures and drugs allows the selection of the right structure-drug fit in each case according to the tissue needs...
May 16, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28521163/application-for-oxytetracycline-wastewater-pretreatment-by-fenton-iron-mud-based-cathodic-anodic-electrolysis-ceramic-granular-fillers
#17
Feilong Zhang, Qinyan Yue, Yuan Gao, Baoyu Gao, Xing Xu, Zhongfei Ren, Yang Jin
In this study, Fenton iron mud applied as main raw material of cathodic-anodic-electrolysis ceramic granular fillers (ICMF) in a continuous reactor, which were used to pretreat oxytetracycline (OTC) wastewater. The ICMF was characterized by Scanning Electron Microscope and Energy Dispersive Spectrometer analysis. The effects of pH value, hydraulic retention time, OTC concentrations and aeration on removal efficiency of total organic carbon (TOC) and OTC were studied. The degradation byproducts of OTC were analyzed by UV-2450, High Performance Liquid Chromatography and Liquid Chromatography-mass Spectrometry...
May 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28518187/in-vitro-shock-absorption-tests-on-implant-supported-crowns-influence-of-crown-materials-and-luting-agents
#18
Martin Rosentritt, Sibylle Schneider-Feyrer, Michael Behr, Verena Preis
PURPOSE: To investigate the force absorption capacity of implant-supported crowns made of different restorative materials and connected to abutments with different luting agents. MATERIALS AND METHODS: Molar crowns were milled of different computer-aided design/computer-aided manufacture materials (n = 8 crowns per material): polymethyl methacrylate, polyether ether ketone, composite, lithium disilicate, titanium, and zirconia. Crowns were mounted on titanium implant replicas using different luting agents: uncemented, temporarily cemented (zinc oxide-eugenol cement), conventionally cemented (zinc oxide phosphate cement), and adhesively bonded...
May 18, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28518093/determining-the-optimal-inhibitory-frequency-for-cancerous-cells-using-tumor-treating-fields-ttfields
#19
Yaara Porat, Moshe Giladi, Rosa S Schneiderman, Roni Blat, Anna Shteingauz, Einav Zeevi, Mijal Munster, Tali Voloshin, Noa Kaynan, Orna Tal, Eilon D Kirson, Uri Weinberg, Yoram Palti
Tumor Treating Fields (TTFields) are an effective treatment modality delivered via the continuous, noninvasive application of low-intensity (1-3 V/cm), alternating electric fields in the frequency range of several hundred kHz. The study of TTFields in tissue culture is carried out using the TTFields in vitro application system, which allows for the application of electric fields of varying frequencies and intensities to ceramic Petri dishes with a high dielectric constant (Ɛ > 5,000). Cancerous cell lines plated on coverslips at the bottom of the ceramic Petri dishes are subjected to TTFields delivered in two orthogonal directions at various frequencies to facilitate treatment outcome tests, such as cell counts and clonogenic assays...
May 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28514897/biomaterials-and-bioactive-agents-in-spinal-fusion
#20
Rui M Duarte, Pedro Varanda, Rui L Reis, Ana Rita C Duarte, Jorge Correia-Pinto
Management of degenerative spine pathologies frequently leads to the need for spinal fusion, where bone growth is induced towards stabilization of the interventioned spine. Autologous bone graft (ABG) remains the gold standard inducer, while new bone graft substitutes attempt to achieve effective de novo bone formation and solid fusion. Limited fusion outcomes have driven motivation for more sophisticated and multidisciplinary solutions, involving new biomaterials and/or biologics, through innovative delivery platforms...
May 17, 2017: Tissue Engineering. Part B, Reviews
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