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https://www.readbyqxmd.com/read/28527193/comparison-of-digital-intraoral-scanners-by-single-image-capture-system-and-full-color-movie-system
#1
Meguru Yamamoto, Yu Kataoka, Atsufumi Manabe
BACKGROUND: The use of dental computer-aided design/computer-aided manufacturing (CAD/CAM) restoration is rapidly increasing. OBJECTIVE: This study was performed to evaluate the marginal and internal cement thickness and the adhesive gap of internal cavities comprising CAD/CAM materials using two digital impression acquisition methods and micro-computed tomography. METHODS: Images obtained by a single-image acquisition system (Bluecam Ver...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28523905/highly-conductive-porous-transition-metal-dichalcogenides-via-water-steam-etching-for-high-performance-lithium-sulfur-batteries
#2
Zhubing Xiao, Zhi Yang, Liujiang Zhou, Linjie Zhang, Ruihu Wang
Lithium-sulfur (Li-S) batteries show significant advantages for next-generation energy storage systems owing to their high energy density and cost effectiveness. The main challenge in the development of long-life and high-performance Li-S batteries is how to simultaneously facilitate the redox kinetics of sulfur species and suppress the shuttle effect of polysulfides. In this contribution, we present a general and green water-steam-etched approach for fabricating H- and O-incorporated porous TiS2 (HOPT). The conductivity, porosity, chemisorptive capability and electrocatalytic activity of HOPT are enhanced significantly when compared with those of raw TiS2...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28516994/3d-ordered-porous-moxc-x-1-or-2-for-advanced-hydrogen-evolution-and-li-storage
#3
Hong Yu, Haosen Fan, Jiong Wang, Yun Zheng, Zhengfei Dai, Yizhong Lu, Junhua Kong, Xin Wang, Young Jin Kim, Qingyu Yan, Jong-Min Lee
3D ordered porous structures of MoxC are prepared with different Mo to C ratios and tested for two possible promising applications: hydrogen evolution reaction (HER) through water splitting and lithium ion batteries (LIBs). Mo2C and MoC with 3D periodic ordered structures are prepared with a similar process but different precursors. The 3D ordered porous MoC exhibits excellent cycling stability and rate performance as an anode material for LIBs. A discharge capacity of 450.9 mA h g(-1) is maintained up to 3000 cycles at 10...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28514042/effect-of-crystallization-firing-on-marginal-gap-of-cad-cam-fabricated-lithium-disilicate-crowns
#4
Steven A Gold, Jack L Ferracane, Juliana da Costa
PURPOSE: To evaluate the marginal gaps of CAD/CAM (CEREC 3) produced crowns made from leucite-reinforced glass-ceramic (IPS Empress CAD) blocks (LG), and lithium-disilicate (IPS e.max CAD) blocks before (LD-B), and after (LD-A) crystallization firing. MATERIALS AND METHODS: A human molar tooth (#19) was mounted with adjacent teeth on a typodont and prepared for a full-coverage ceramic crown. The typodont was assembled in the mannequin head to simulate clinical conditions...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28513142/12-13-aziridinyl-epothilones-stereoselective-synthesis-of-trisubstituted-olefinic-bonds-from-methyl-ketones-and-heteroaromatic-phosphonates-and-design-synthesis-and-biological-evaluation-of-potent-antitumor-agents
#5
K C Nicolaou, Derek Rhoades, Yanping Wang, Ruoli Bai, Ernest Hamel, Monette Aujay, Joseph Sandoval, Julia Gavrilyuk
The synthesis and biological evaluation of a series of 12,13-aziridinyl epothilone B analogues is described. These compounds were accessed by a practical, general process that involved a 12,13-olefinic methyl ketone as a starting material obtained by ozonolytic cleavage of epothilone B followed by tungsten-induced deoxygenation of the epoxide moiety. The attachment of the aziridine structural motif was achieved by application of the Ess-Kürti-Falck aziridination, while the heterocyclic side chains were introduced via stereoselective phosphonate-based olefinations...
May 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28509535/molybdenum-tungsten-mixed-oxide-deposited-into-titanium-dioxide-nanotube-arrays-for-ultrahigh-rate-supercapacitors
#6
He Zhou, Xiaopeng Zou, Kaikai Zhang, Peng Sun, Md Suzaul Islam, Jianyu Gong, Yanrong Zhang, Jiakuan Yang
A novel method involving the fabrication of Mo-W mixed oxide (MoxW1-xO3) is proposed to modify the modest reaction kinetics and poor cycling stability of MoO3 material. By a simple co-electrodeposition method, a series of MoxW1-xO3 oxides is deposited on a TiO2 nanotube array substrate. Due to the differences between Mo6+ and W6+ in nature, there is significant distortion existing in the mixed oxides, leading to their decreased crystallite size and enlarged lattice space, which facilitates ion diffusion in the solid...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28501068/preliminary-evidence-for-the-complete-digital-esthetic-rehabilitation-treatment-case-report-and-1-year-follow-up
#7
Pablo J Atria, Camila S Sampaio, Ronaldo Hirata, Gilbert Jorquera
PURPOSE: To show through computer-aided design and manufacturing technology combined with novel digital acquisition images and the right restorative material that the technology can provide an easier and predictable workflow for general practitioners. BASIC PROCEDURE: This case report presents a fully digital treatment of a 59-year-old patient with tooth-supported crowns and provides a detailed step-by-step digital technique to obtain a successful result. CONCLUSION: By avoiding traditional impression and fixed prosthetic techniques, excellent clinical results can be obtained, minimizing the required steps and simplifying the overall procedure...
June 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/28487196/strategies-for-cost-effective-and-enhanced-production-of-bacterial-cellulose
#8
REVIEW
Mazhar Ul Islam, Muhammad Wajid Ullah, Shaukat Khan, Nasrullah Shah, Joong Kon Park
Bacterial cellulose (BC) has received substantial attention because of its high purity, mechanical strength, crystallinity, liquid-absorbing capabilities, biocompatibility, and biodegradability etc. These properties allow BC to be used in various fields, especially in industries producing medical, electronic, and food products etc. A major discrepancy associated with BC is its high production cost, usually much higher than the plant cellulose. To address this limitations, researchers have developed several strategies for enhanced production of BC including the designing of advanced reactors and utilization of various carbon sources...
May 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28485846/oxytocin-and-migraine-headache
#9
REVIEW
Alexander Tzabazis, Shashi Kori, Jordan Mechanic, James Miller, Conrado Pascual, Neil Manering, Dean Carson, Michael Klukinov, Egilius Spierings, Daniel Jacobs, Jason Cuellar, William H Frey, Leah Hanson, Martin Angst, David C Yeomans
This article reviews material presented at the 2016 Scottsdale Headache Symposium. This presentation provided scientific results and rationale for the use of intranasal oxytocin for the treatment of migraine headache. Results from preclinical experiments are reviewed, including in vitro experiments demonstrating that trigeminal ganglia neurons possess oxytocin receptors and are inhibited by oxytocin. Furthermore, most of these same neurons contain CGRP, the release of which is inhibited by oxytocin. Results are also presented which demonstrate that nasal oxytocin inhibits responses of trigeminal nucleus caudalis neurons to noxious stimulation using either noxious facial shock or nitroglycerin infusion...
May 2017: Headache
https://www.readbyqxmd.com/read/28482782/anti-cancer-drug-delivery-using-carbohydrate-based-polymers
#10
Javad Ranjbari, Ahad Mokhtarzadeh, Abbas Alibakhshi, Maryam Tabarzad, Maryam Hejazi, Mohammad Ramezani
Polymeric drug delivery systems in the form of nanocarriers are the most interesting vehicles in anti-cancer therapy. Among different types of biocompatible polymers, carbohydrate-based polymers or polysaccharides are the most common natural polymers with complex structures consisting of long chains of monosaccharide or disaccharide units bound by glycosidic linkages. Their appealing properties such as availability, biocompatibility, biodegradability, low toxicity, high chemical reactivity, facile chemical modification and low cost led to their extensive applications in biomedical and pharmaceutical fields including development of nano-vehicles for delivery of anti-cancer therapeutic agents...
May 5, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28477300/comparison-of-access-hole-filling-materials-for-screw-retained-implant-prostheses-12-month-in-vivo-study
#11
Rémy Tanimura, Shiro Suzuki
BACKGROUND: Screw retained implant prostheses seem to be an efficient restorative method to prevent peri-implantitis caused by cement excess around the abutment. The drawback of the screw-retained prostheses is the difficulty to realize an efficient access-hole filling functionally and aesthetically. Up to now, few in vitro and in vivo studies were reported in the literature. The aim of this study was to evaluate clinical performances of two direct filling materials through a period of 12 months...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28476079/self-templated-synthesis-of-nickel-silicate-hydroxide-reduced-graphene-oxide-composite-hollow-microspheres-as-highly-stable-supercapacitor-electrode-material
#12
Yanhua Zhang, Wenjie Zhou, Hong Yu, Tong Feng, Yong Pu, Hongdong Liu, Wei Xiao, Liangliang Tian
Nickel silicate hydroxide/reduced graphene oxide (Ni3Si2O5(OH)4/RGO) composite hollow microspheres were one-pot hydrothermally synthesized by employing graphene oxide (GO)-wrapped SiO2 microspheres as the template and silicon source, which were prepared through sonication-assisted interfacial self-assembly of tiny GO sheets on positively charged SiO2 substrate microspheres. The composition, morphology, structure, and phase of Ni3Si2O5(OH)4/RGO microspheres as well as their electrochemical properties were carefully studied...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28470970/modifying-commercial-carbon-with-trace-amounts-of-zif-to-prepare-derivatives-with-superior-orr-activities
#13
Bing Ni, Chen Ouyang, Xiaobin Xu, Jing Zhuang, Xun Wang
Reducing costs while maintaining high activities and stabilities of oxygen reduction reaction (ORR) catalysts has long been pursued for applications to membrane fuel cells. Here, an absorption-reaction method is used to prepare a zeolitic imidazolate framework coated commercial carbon, and the pyrolysis of such material brings about impressive ORR activities and stabilities with large diffusion-limited current density, half-wave potential, and no obvious decay after 10 000 cyclic voltammetry cycles, which is even better than that of the commercial Pt/C catalysts...
May 4, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28463363/from-natural-cotton-thread-to-sewable-energy-dense-supercapacitors
#14
Jian Zhi, Oliver Reiser, Youfu Wang, Aiguo Hu
Considering cost and flexibility, cotton thread is an ideal material for the fabrication of wearable and portable electronics. However, the capacitance of cotton thread based supercapacitors remains extremely low (below 50 mF cm(-2)) due to the insufficient capacitive utilization of active materials. In this work, ordered mesoporous carbon (OMC) membranes are rationally coupled with chemical vapour deposition derived graphene (CVD gr), to form a highly conductive carbon coating around cotton yarn. In this material design, OMC membranes act as hydrophilic nanoporous "ion reservoirs" to accumulate sufficient cations from a gel electrolyte, while CVD gr endows the composite thread low liner resistance (3...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28460945/development-of-a-robotic-pourer-constructed-with-ubiquitous-materials-open-hardware-and-sensors-to-assess-beer-foam-quality-using-computer-vision-and-pattern-recognition-algorithms-robobeer
#15
Claudia Gonzalez Viejo, Sigfredo Fuentes, GuangJun Li, Richard Collmann, Bruna Condé, Damir Torrico
There are currently no standardized objective measures to assess beer quality based on the most significant parameters related to the first impression from consumers, which are visual characteristics of foamability, beer color and bubble size. This study describes the development of an affordable and robust robotic beer pourer using low-cost sensors, Arduino® boards, Lego® building blocks and servo motors for prototyping. The RoboBEER is also coupled with video capture capabilities (iPhone 5S) and automated post hoc computer vision analysis algorithms to assess different parameters based on foamability, bubble size, alcohol content, temperature, carbon dioxide release and beer color...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28449610/using-twitter-to-increase-content-dissemination-and-control-educational-content-with-presenter-initiated-and-generated-live-educational-tweets-piglets
#16
Sarah Tomlinson, Mary Haas, L Melissa Skaugset, Stephen J Cico, Margaret Wolff, Sally Santen, Michelle Lin, Robert Huang
Live-tweeting during educational presentations is typically learner-generated and can lead to misquoted information. Presenter curated tweets have not been well described. We created Presenter Initiated and Generated Live Educational Tweets (PIGLETs) with the goal to broaden the reach of educational conferences. We hypothesized that using PIGLETs would increase the reach and exposure of our material. We developed a prospective single-arm intervention study performed during the "Not Another Boring Lecture" workshops presented at two national conferences in 2015...
April 27, 2017: Medical Teacher
https://www.readbyqxmd.com/read/28449258/improve-toolmarks-impressions-in-soft-wax
#17
Nir Finkelstein, Nikolai Volkov, Tsadok Tsach
When the forensic toolmarks laboratory receives for examination and comparison a tool that is suspected of having been involved in a crime, the expert performs tests designed to determine whether or not the specific tool generates the same toolmarks as those found at the crime scene. This is performed by testing tool striation on a piece of soft metal, such as lead, and examining the marks left by the tool. Studies have shown that wax may be an optimal material for this purpose. This study examines the use of wax at different temperatures and shows that quality of results is better when the wax is cooled (recommended temperature is -18°C)...
May 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28440911/unnoticed-aspiration-of-palate-plate-impression-material-in-a-neonate-diagnosis-therapy-outcome
#18
Friedrich Reichert, Peter Amrhein, Frank Uhlemann
A 7 week old infant was admitted with respiratory failure. Chest X-ray showed an atelectatic right upper lobe, herniation of right middle and lower lobe into the left thorax, and compression-atelectasis of the left lung. Thoracic CT showed complete occlusion of the right superior bronchus with a radiopaque foreign material. Six weeks prior, an impression for a palate plate using polyvinylsiloxane was taken. The material was removed with a rigid endoscopy, in readiness of extracorporeal oxygenation in case of tracheal obstruction or bronchial rupture...
April 25, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/28436522/integrated-hydrogen-evolution-and-water-cleaning-via-a-robust-graphene-supported-noble-metal-free-fe1-xcoxs2-system
#19
Yingying Fan, Dandan Wang, Dongxue Han, Yingming Ma, Shuang Ni, Zhonghui Sun, Xiandui Dong, Li Niu
In an electrocatalytic hydrogen evolution reaction (HER) system, a cathodic H(+) resource, an anodic sacrificial agent and a robust catalyst are three essential factors. Industry wastewater emissions, containing high levels of acidity and organic dyes, actually can satisfy the material requirements for the HER. Herein, a new HER method is proposed, taking acidic ions from wastewater as a cathodic resource to produce H2, while organic dye waste acts as an anodic sacrifice to balance the reaction. In such a way, a sustainable H2 energy source can be generated and clean water is obtained as well...
May 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28422353/comprehensive-review-and-comparison-of-the-disinfection-techniques-currently-available-in-the-literature
#20
REVIEW
Ahila S Chidambaranathan, Muthukumar Balasubramanium
The goal of disinfection in the dental office is to prevent the spread of infection from one patient to another and maintain the safety of the dental care providers. Prevention of cross infection has significant effect on infection control. The standard procedure of rinsing impressions under tap water immediately after removal from the mouth eliminates microorganisms along with saliva and blood. A broad search on published literature was done using the keywords impression materials, disinfection method, and sterilization of dental impression from 1980 to 2016 in Medline, Google Scholar, the internet, and textbooks...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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