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https://www.readbyqxmd.com/read/29347885/preparation-of-affordable-and-multi-functional-clay-based-ceramic-filter-matrix-for-treatment-of-drinking-water
#1
H Puttaiah Shivaraju, Henok Egumbo, P Madhusudan, K M Anil Kumar, G Midhun
In the present study, affordable clay-based ceramic filters with multi-functional properties were prepared using low-cost and active ingredients. The characterization results of as-prepared materials clearly revealed well crystallinity, structural elucidation, extensive porosity, higher surface area, higher stability, and durability which apparently enhance the treatment efficiency. The filtration rates of ceramic filter were evaluated under gravity and the results obtained were compared with typical gravity slow sand filter...
January 18, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29347851/the-era-of-biofunctional-biomaterials-in-orthopedics-what-does-the-future-hold
#2
Mubashar Rehman, Asadullah Madni, Thomas J Webster
Titanium-based materials do not fulfill all the requirements of orthopedic implants due to a mismatch in mechanical properties with bone which are prone to change during the course of bone growth. Biofunctional biomaterials are a new class of materials that show bioactivity and adaptability at any stage of bone growth. Areas covered: Different biofunctional biomaterials have evolved over time that can enhance calcium phosphate (CaP) precipitation, stimulate osteogenic differentiation, and can control osteoblast gene expression...
January 18, 2018: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/29346723/shear-induced-brittle-failure-along-grain-boundaries-in-boron-carbide
#3
Xiaokun Yang, Shawn P Coleman, Jerry Lasalvia, William A Goddard, Qi An
The roles of grain boundaries (GB) in mechanical properties have been examined extensively for metals and alloys; however, for covalent solids their roles in deformation response to applied stress are much less established. We consider here the unusual ceramic, boron carbide (B4C), which is very hard and lightweight but exhibits brittle impact behavior. We used quantum mechanics (QM) simulations to determine the mechanical response in the atomistic structures at GBs under pure shear and also with biaxial shear deformation that mimics indentation stress conditions...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29340480/bone-repair-access-of-boneceramic%C3%A2-in-5-mm-defects-study-on-rat-calvaria
#4
André Luis da Silva Fabris, Leonardo Perez Faverani, Pedro Henrique Silva Gomes-Ferreira, Tárik Ocon Braga Polo, Joel Ferreira Santiago-Júnior, Roberta Okamoto
OBJECTIVE: The aim of this study was to evaluate the osteoconductive potential of BoneCeramic™ on bone healing in rat calvaria 5-mm defects. MATERIAL AND METHODS: A 5-mm calvaria bone defect was induced in three groups and the defect was not filled with biomaterial [Clot Group (CG)], autogenous bone (AG), or Bone Ceramic Group (BCG). Animals were euthanized after 14 or 28 days and the bone tissue within the central area of the bone defect was evaluated. Results were compared using ANOVA and Tukey test (p<0...
January 15, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29337644/performance-of-monolithic-and-veneered-zirconia-crowns-after-endodontic-treatment-and-different-repair-strategies
#5
A Scioscia, A Helfers, S Soliman, G Krastl, N U Zitzmann
OBJECTIVES: To investigate failure loads of monolithic and veneered all-ceramic crowns after root canal treatment and to analyze marginal integrity of repair fillings. METHODS AND MATERIALS: Seventy-two human molars were restored with monolithic (Zr-All) or veneered (Zr-Ven) zirconia crowns. Molars were assigned to six groups (n=12 per group) depending on restoration material, access type (no access cavity [control] or endodontic treatment [test]), and type of filling (one-step [1-st] or two-step [2-st])...
January 16, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29336858/are-ceramic-bearings-becoming-cost-effective-for-all-patients
#6
Steven M Kurtz, Edmund C Lau, Doruk Baykal, Susan M Odum, Bryan D Springer, Thomas K Fehring
BACKGROUND: The purpose of this study is to analyze whether the cost for ceramic-on-polyethylene (C-PE) and ceramic-on-ceramic (COC) bearings used in primary total hip arthroplasty (THA) was changing over time, and if the cost differential between ceramic bearings and metal-on-polyethylene (M-PE) bearings was approaching the previously published tipping point for cost-effectiveness of $325. METHODS: A total of 245,077 elderly Medicare patients (65+) who underwent primary THA between 2010 and 2015 were identified from the United States Medicare 100% national administrative hospital claims database...
December 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29334456/building-ion-conduction-highways-in-polymeric-electrolytes-by-manipulating-protein-configuration
#7
Xuewei Fu, Chunhui Li, Yu Wang, Lucas Paul Kovatch, Louis Scudiero, Jin Liu, Wei-Hong Zhong
Solid polymer electrolytes play a critical role in the development of safe, flexible and all-solid-state energy storage devices. However, the low ion-conductivity has been the primary challenge impeding them from practical applications. Here, we propose a new biotechnology to fabricate novel protein-ceramic hybrid nanofillers for simultaneously boosting the ionic conductivity, mechanical properties and even adhesion properties of solid polymer electrolytes. This hybrid nanofiller is fabricated by coating ion-conductive soy-proteins onto TiO2 nanoparticles via a controlled denaturation process in appropriate solvent and conditions...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29333772/-effect-of-different-surface-processes-on-the-bond-strength-between-zirconia-framework-and-veneering-ceramic
#8
Gong Qi, Sun Huiqiang, Hu Yijun, Chen Jia, Ding Weishan
OBJECTIVE: To compare the effect of different surface processes on bond strength and microscopic structure using a scanning electron microscope (SEM) and an energy distribution spectrum (EDS) at the bonding interface between zirconia framework and veneering ceramic. METHODS: WIELAND zirconia core material was cut into 33 rectangular specimens and fired on into rectangular specimens (10 mm×5 mm×5 mm). The specimens were randomly divided into three groups (n=
11)...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333771/-effect-of-hydrofluoric-acid-concentration-on-the-surface-morphology-and-bonding-effectiveness-of-lithium-disilicate-glass-ceramics-to-resin-composites
#9
Qian Hailan, Ren Lingyan, Nie Rongrong, Meng Xiangfeng
OBJECTIVE: This study aimed at determining the influence of hydrofluoric acid (HF) in varied concentrations on the surface morphology of lithium disilicate glass ceramics and bond durability between resin composites and post-treated lithium disilicate glass ceramics. METHODS: After being sintered, ground, and washed, 72 as-prepared specimens of lithium disilicate glass ceramics with dimensions of 11 mm×13 mm×2 mm were randomly divided into three groups. Each group was treated with acid solution [32% phosphoric acid (PA) or 4% or 9...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333707/impact-of-gastric-acid-induced-surface-changes-on-mechanical-behavior-and-optical-characteristics-of-dental-ceramics
#10
Aditi Kulkarni, James Rothrock, Jeffery Thompson
PURPOSE: To test the impact of exposure to artificial gastric acid combined with toothbrush abrasion on the properties of dental ceramics. Earlier research has indicated that immersion in artificial gastric acid has caused increased surface roughness of dental ceramics; however, the combined effects of acid immersion and toothbrush abrasion and the impact of increased surface roughness on mechanical strength and optical properties have not been studied. MATERIALS AND METHODS: Three commercially available ceramics were chosen for this study: feldspathic porcelain, lithium disilicate glass-ceramic, and monolithic zirconium oxide...
January 14, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29327546/-bone-mineral-density-decreased-is-a-high-risk-factor-for-uncemented-acetabular-cups-migration-in-female-total-hip-arthroplasty-patients
#11
Jia Liu, Jiang Deng, Xiao-Song Han, Lin Xu
OBJECTIVE: To investigate the decrease of bone mineral density in female patients, effects on acetabular displacement. METHODS: From October 2013 to November 2015, a total of 34 patients underwent total hip replacement in the Department of orthopedics, the Third Affiliated Hospital of Zunyi Medical College. The two groups of patients were female and the patients were treated with hip osteoarthritis. Based on the lowest value of preoperative dual energy X-ray bone mineral density (DXA), the patients were divided into normal group and low bone mineral density(-3...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29327466/analysis-of-trace-levels-of-impurities-and-hydrogen-isotopes-in-helium-purge-gas-using-gas-chromatography-for-tritium-extraction-system-of-an-indian-lead-lithium-ceramic-breeder-test-blanket-module
#12
V Gayathri Devi, Amit Sircar, Deepak Yadav, Jayraj Parmar
In the fusion fuel cycle, the accurate analysis and understanding of the chemical composition of any gas mixture is of great importance for the efficient design of a tritium extraction and purification system or any tritium handling system. Methods like laser Raman spectroscopy and gas chromatography with thermal conductivity detector have been considered for hydrogen isotopes analyses in fuel cycles. Gas chromatography with a cryogenic separation column has been used for the analysis of hydrogen isotopes gas mixtures in general due to its high reliability and ease of operation...
January 12, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29325887/stiffness-and-strength-of-cranioplastic-implant-systems-in-comparison-to-cranial-bone
#13
Johan Persson, Benedikt Helgason, Håkan Engqvist, Stephen J Ferguson, Cecilia Persson
PURPOSE: The aim of this study was to evaluate skull replacement options after decompressive craniectomy by systematically investigating which combination of geometrical properties and material selection would result in a mechanical response comparable in stiffness to that of native skull bone and a strength as high or higher than the same. MATERIALS AND METHODS: The study was conducted using a Finite Element Model of the top part of a human skull. Native skull bone, autografts and commercial implants made of PEEK, solid titanium, two titanium meshes and a titanium-ceramic composite were modeled under a set load to evaluate deformation and maximum stress...
December 13, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29323782/the-effect-of-surface-treatments-on-the-mechanical-and-optical-behaviors-of-cad-cam-restorative-materials
#14
Sevcan Kurtulmus-Yilmaz, Esra Cengiz, Salim Ongun, Izgen Karakaya
PURPOSE: To evaluate the effect of different surface treatments on mechanical and optical properties of lithium disilicate ceramic (IPS e.max CAD), 2 resin nanoceramics (Lava Ultimate, GC Cerasmart), and polymer-infiltrated ceramic network material (Vita Enamic). MATERIALS AND METHODS: CAD/CAM blocks were sectioned into 4 × 1 × 14 mm3 bars for three-point bending test and 1 × 8 × 8 mm3 square specimens were obtained for color and translucency measurements. Bar-shaped and square specimens were divided into five groups according to the surface treatment method as: control (no treatment), hydrofluoric acid etching, airborne-particle abrasion, 2 W and 3 W Er,Cr:YSGG laser irradiation (n = 10)...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322389/performance-of-ceramic-ultrafiltration-and-reverse-osmosis-membranes-in-treating-car-wash-wastewater-for-reuse
#15
Shamima Moazzem, Jamie Wills, Linhua Fan, Felicity Roddick, Veeriah Jegatheesan
Reusing treated effluents in industries is a great option to conserve freshwater resources. For example, car wash centres all over Australia are estimated to use 17.5 billion litres of water and discharge it as wastewater and spend $75 million a year for both purchasing fresh water and for treating and/or discharging the wastewater. Therefore, it is important to develop simple but reliable systems that can help to treat and reuse car wash wastewater. Significant savings could also be associated with the implementation of such systems...
January 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29321010/evaluation-of-five-cad-cam-materials-by-microstructural-characterization-and-mechanical-tests-a-comparative-in-vitro-study
#16
Nesrin Sonmez, Pinar Gultekin, Volkan Turp, Gokhan Akgungor, Deniz Sen, Eitan Mijiritsky
BACKGROUND: Polymer infiltrated ceramics and nano-ceramic resins are the new restorative materials which have been developed in order to enhance the adverse properties of glass-matrix ceramics and resin composites. The aim of the present in vitro study was to evaluate the characteristics of various CAD/CAM materials through mechanical, microstructural, and SEM analysis. METHODS: Five test groups (n = 22) were formed by using the indicated CAD/CAM blocks: VITA Enamic (VITA Zahnfabrik), Lava Ultimate (3 M ESPE), IPS e...
January 8, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29320923/the-effect-of-seated-pelvic-tilt-on-posterior-edge-loading-in-total-hip-arthroplasty-a-finite-element-investigation
#17
Jim Pierrepont, Long Yang, Jevan Arulampalam, Catherine Stambouzou, Brad Miles, Qing Li
Edge-loading of a ceramic-on-ceramic total hip replacement can lead to reproducible squeaking and revision. A patient's functional acetabular cup orientation, driven by their pelvic tilt, has been shown to be a significant factor in squeaking during hip flexion. The aim of this study was to investigate the effect of seated pelvic tilt on the contact mechanics at the ceramic bearing surface. A finite element model of a ceramic-on-ceramic total hip replacement was created. The cup was orientated at 40° inclination and 15° anteversion relative to the anterior pelvic plane...
January 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29319895/the-onset-of-fretting-at-the-head-stem-connection-in-hip-arthroplasty-is-affected-by-head-material-and-trunnion-design-under-simulated-corrosion-conditions
#18
Fiachra E Rowan, Amanda Wach, Timothy M Wright, Douglas E Padgett
Mechanically assisted crevice corrosion (MACC) is a mechanism for trunnion damage in total hip arthroplasties (THAs). Retrieval studies have shown reduced MACC-related damage for ceramic heads compared with cobalt-chromium (CoCr) heads. We propose that ceramic heads demonstrate fretting at higher cyclic compressive loads than CoCr heads on titanium alloy trunnions in a simulated corrosion model. A closed electrochemical chamber was used to measure fretting current onset loads for two modern titanium alloy trunnions (Zimmer 12/14 and Stryker V-40) in which trunnion failure has been reported...
January 10, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29318899/influence-of-transmucosal-height-in-abutments-of-single-and-multiple-implant-supported-prostheses-a-non-linear-three-dimensional-finite-element-analysis
#19
Eduardo Borie, Eduardo Leal, Iara Augusta Orsi, Carlos Salamanca, Fernando José Dias, Benjamin Weber
The aim of this study was to analyze the influence of three different transmucosal heights of the abutments in single and multiple implant-supported prostheses through the finite element method. External hexagon implants, MicroUnit, and EsthetiCone abutments were scanned and placed in an edentulous maxillary model obtained from a tomography database. The simulations were divided into two groups: (1) one implant with 3.75 × 10 mm placed in the upper central incisor, simulating a single implant-supported fixed prosthesis with an EsthetiCone abutment; and (2) two implants with 3...
January 10, 2018: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29315659/the-role-of-glutamate-signaling-in-incentive-salience-second-by-second-glutamate-recordings-in-awake-sprague-dawley-rats
#20
Seth R Batten, Francois Pomerleau, Jorge Quintero, Greg A Gerhardt, Joshua S Beckmann
The attribution of incentive salience to reward-predictive stimuli has been shown to be associated with substance abuse-like behavior such as increased drug taking. Evidence suggests that glutamate neurotransmission and sequential N-methyl-D-aspartate (NMDA) activation are involved in the attribution of incentive salience. Here we further explore the role of second-by-second glutamate neurotransmission in the attribution of incentive salience to reward-predictive stimuli by measuring sign-tracking behavior during a Pavlovian conditioned approach procedure using ceramic-based microelectrode arrays configured for sensitive measures of extracellular glutamate in awake behaving Sprague Dawley rats...
January 8, 2018: Journal of Neurochemistry
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