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https://www.readbyqxmd.com/read/28222872/clinical-marginal-fit-of-zirconia-crowns-and-patients-preferences-for-impression-techniques-using-intraoral-digital-scanner-versus-polyvinyl-siloxane-material
#1
Nawapat Sakornwimon, Chalermpol Leevailoj
STATEMENT OF PROBLEM: The use of digital intraoral scanners is increasing; however, evidence of its precision in making crown impressions clinically remains scarce. Patients should also feel more comfortable with digital impressions, but only a few studies evaluating this subject have been performed. PURPOSE: The purpose of this clinical study was to evaluate the marginal fit of monolithic zirconia crowns and patients' preferences for digital impressions versus polyvinyl siloxane (PVS) impressions...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222608/postsynthetically-modified-covalent-organic-frameworks-for-efficient-and-effective-mercury-removal
#2
Qi Sun, Briana Aguila, Jason Perman, Lyndsey D Earl, Carter W Abney, Yuchuan Cheng, Hao Wei, Nicholas Nguyen, Lukasz Wojtas, Shengqian Ma
A key challenge in environmental remediation is the design of adsorbents bearing an abundance of accessible chelating sites with high affinity, to achieve both rapid uptake and high capacity for the contaminants. Herein, we demonstrate how two-dimensional covalent organic frameworks (COFs) with well-defined mesopore structures display the right combination of properties to serve as a scaffold for decorating coordination sites to create ideal adsorbents. The proof-of-concept design is illustrated by modifying sulfur derivatives on a newly designed vinyl-functionalized mesoporous COF (COF-V) via thiol-ene "click" reaction...
February 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28217264/eight-essential-foods-in-iranian-traditional-medicine-and-their-role-in-health-promotion-and-well-being
#3
REVIEW
Mehrdad Zeinalian, Mehdi Eshaghi, Mahdi Hadian, Homayoun Naji, Sayed Mohammad Masoud Marandi, Sedigheh Asgary
Eight essential foods (EEF) described in Iranian traditional medicine (ITM) have a determinant role to balance human temperament insuring health and well-being. EEF included oral, imaginary, auditory, visual, olfactory, touch, sexual, and familiarity food. Oral foods should be halal, compatible with individual temper, consumed up twice a day, and compatible with different seasons and geographic conditions. Imaginary food consists of the individual thought content which is directly related to mental and physical fitness...
2017: International Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28216844/effect-of-technique-and-impression-material-on-the-vertical-misfit-of-a-screw-retained-three-unit-implant-bridge-an-in-vitro-study
#4
Hamidreza Rajati Haghi, Masoud Shiehzadeh, Mohammadreza Nakhaei, Fatemeh Ahrary, Saeid Sabzevari
INTRODUCTION: A dental impression is a negative imprint of an oral structure that can be used to produce a positive cast of a patient's teeth as a permanent record. The accuracy of the impression affects the accuracy of the cast, and a precise impression is needed in order to create prosthesis with optimal fitting. Minimization of misfit is an important aim in prosthesis science and dental implants. The aim of this study was to evaluate the effects of the materials and techniques used to take an impression on the vertical misfit of implant-supported, screw-retained, three-unit bridges...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28213347/a-new-cheirolepidiaceae-coniferales-from-the-early-jurassic-of-patagonia-argentina-reconciling-the-records-of-impression-and-permineralized-fossils
#5
Ignacio Escapa, Andrew Leslie
PREMISE OF THE STUDY: Plants preserved in different fossil modes provide complementary data concerning the paleobiology and evolutionary relationships among plant groups. New material from the Early Jurassic of Patagonia shows the importance of combining these sources of information, as we describe the first compression/impression fossils of Pararaucaria, a genus of the extinct conifer family Cheirolepidiaceae previously known from permineralized fossils. These fossils extend the temporal range of this genus and may allow its wider recognition in the fossil record...
February 17, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28208993/preliminary-sem-observations-on-the-surface-of-elastomeric-impression-materials-after-immersion-or-ozone-disinfection
#6
Nikolas Poulis, Anthony Prombonas, Stavros Yannikakis, Thanasis Karampotsos, Martha-Spyridoula Katsarou, Nikolaos Drakoulis
INTRODUCTION: Surface integrity of dental elastomeric impression materials that are subjected to disinfection is of major importance for the quality of the final prosthetic restorations. AIM: The aim of this qualitative Scanning Electronic Microscopy (SEM) study was to reveal the effects of immersion or ozone disinfection on the surface of four dental elastomeric impression materials. MATERIALS AND METHODS: Four dental elastomeric impression material brands were used (two vinyl polysiloxane silicones, one polyether, and one vinyl polyether silicone)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28203010/-evaluation-of-production-and-clinical-working-time-of-computer-aided-design-computer-aided-manufacturing-cad-cam-custom-trays-for-complete-denture
#7
L Wei, H Chen, Y S Zhou, Y C Sun, S X Pan
OBJECTIVE: To compare the technician fabrication time and clinical working time of custom trays fabricated using two different methods, the three-dimensional printing custom trays and the conventional custom trays, and to prove the feasibility of the computer-aided design/computer-aided manufacturing (CAD/CAM) custom trays in clinical use from the perspective of clinical time cost. METHODS: Twenty edentulous patients were recruited into this study, which was prospective, single blind, randomized self-control clinical trials...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28193874/six-centuries-of-geomagnetic-intensity-variations-recorded-by-royal-judean-stamped-jar-handles
#8
Erez Ben-Yosef, Michael Millman, Ron Shaar, Lisa Tauxe, Oded Lipschits
Earth's magnetic field, one of the most enigmatic physical phenomena of the planet, is constantly changing on various time scales, from decades to millennia and longer. The reconstruction of geomagnetic field behavior in periods predating direct observations with modern instrumentation is based on geological and archaeological materials and has the twin challenges of (i) the accuracy of ancient paleomagnetic estimates and (ii) the dating of the archaeological material. Here we address the latter by using a set of storage jar handles (fired clay) stamped by royal seals as part of the ancient administrative system in Judah (Jerusalem and its vicinity)...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28174366/radiofrequency-glow-discharge-as-a-mode-of-disinfection-for-elastomeric-impression-materials
#9
Susan Mathew, Mathew M Alani, K N Velayudhan Nair, Sayij Haridas, P B Reba, Sherin A Thomas
INTRODUCTION: Prosthodontic practice involves procedures in which impressions of the maxillary and mandibular arches are mandatory. Cross infection is one of the major problems that can occur in regular dental practice. Every dentist should take utmost care to prevent cross infection as oral cavity is the source of variety of microorganisms which can often cause diseases that can be fatal. Although precautions, such as wearing of gloves and mask, sterilization of instruments are given importance, the need for disinfection of impressions is often neglected...
February 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28168124/geography-shapes-the-phylogeny-of-frailejones-espeletiinae-cuatrec-asteraceae-a-remarkable-example-of-recent-rapid-radiation-in-sky-islands
#10
Mauricio Diazgranados, Janet C Barber
BACKGROUND: The páramo ecosystem, located above the timberline in the tropical Andes, has been the setting for some of the most dramatic plant radiations, and it is one of the world's fastest evolving and most diverse high-altitude ecosystems. Today 144+ species of frailejones (subtribe Espeletiinae Cuatrec., Asteraceae) dominate the páramo. Frailejones have intrigued naturalists and botanists, not just for their appealing beauty and impressive morphological diversity, but also for their remarkable adaptations to the extremely harsh environmental conditions of the páramo...
2017: PeerJ
https://www.readbyqxmd.com/read/28165716/trash-to-treasure-waste-eggshells-as-chemical-reactors-for-the-synthesis-of-amorphous-co-oh-2-nanorod-arrays-on-various-substrates-for-applications-in-rechargeable-alkaline-batteries-and-electrocatalysis
#11
Xinghua Meng, Da Deng
Bioinspired synthesis has been attracting much attention. Here, we demonstrate a novel approach to directly use waste eggshells as a reactor system for controlled synthesis of nanostructures formed on different substrates. This approach can recycle and transform the "trash" of waste eggshells into "treasure" of unique reactor systems for nanofabrication. The eggshell reactor system can provide unique conditions for the formation of nanostructures on various substrates. Using Co(OH)2 as a model, amorphous Co(OH)2 nanorod arrays, which cannot be synthesized conventionally by direct mixing of precursors, have been successfully formed on various substrates, including Ni foam, metal foil, and glass...
February 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28165189/a-metal-chelating-porous-polymeric-support-the-missing-link-for-a-defect-free-metal-organic-framework-composite-membrane
#12
Eva Barankova, Xiaoyu Tan, Luis Francisco Villalobos, Eric Litwiller, Klaus-Viktor Peinemann
Since the discovery of size-selective metal-organic frameworks (MOFs), researchers have tried to incorporate these materials into gas separation membranes. Impressive gas selectivities were found, but these MOF membranes were mostly made on inorganic supports, which are generally too bulky and expensive for industrial gas separation. Forming MOF layers on porous polymer supports is industrially attractive but technically challenging. Two features to overcome these problems are described: 1) a metal chelating support polymer to bind the MOF layer, and 2) control of MOF crystal growth by contra-diffusion, aiming at a very thin nanocrystalline MOF layer...
February 6, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28156618/patients-perception-of-palliative-treatment-objectives
#13
Maria R B Tria Tirona
: 43 Background: Palliative chemotherapy and radiation are often used in patients with advanced stage of cancer. To weigh the risks and the benefits of this treatment, patients need to be adequately informed about all treatment aspects including the side effects and potential benefits. Unfortunately, many patients are not well informed about the goal of their treatment, and many are under the impression that this treatment can be curative. METHODS: This is a prospective survey based study that enrolled 46 patients with stage IV disease of all solid malignancies, who are being treated with palliative intent at the Edwards Comprehensive Cancer Center...
October 9, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28145632/design-synthesis-and-photovoltaic-characterization-of-a-small-molecular-acceptor-with-an-ultra-narrow-band-gap
#14
Huifeng Yao, Yong Cui, Runnan Yu, Bowei Gao, Hao Zhang, Jianhui Hou
The design of narrow band gap (NBG) donors or acceptors and their application in organic solar cells (OSCs) are of great importance in the conversion of solar photons to electrons. Limited by the inevitable energy loss from the optical band gap of the photovoltaic material to the open-circuit voltage of the OSC device, the improvement of the power conversion efficiency (PCE) of NBG-based OSCs faces great challenges. A novel acceptor-donor-acceptor structured non-fullerene acceptor is reported with an ultra-narrow band gap of 1...
February 1, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28138223/computational-intelligence-models-to-predict-porosity-of-tablets-using-minimum-features
#15
Mohammad Hassan Khalid, Pezhman Kazemi, Lucia Perez-Gandarillas, Abderrahim Michrafy, Jakub Szlęk, Renata Jachowicz, Aleksander Mendyk
The effects of different formulations and manufacturing process conditions on the physical properties of a solid dosage form are of importance to the pharmaceutical industry. It is vital to have in-depth understanding of the material properties and governing parameters of its processes in response to different formulations. Understanding the mentioned aspects will allow tighter control of the process, leading to implementation of quality-by-design (QbD) practices. Computational intelligence (CI) offers an opportunity to create empirical models that can be used to describe the system and predict future outcomes in silico...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28135398/influence-of-the-addition-of-minced-fish-on-the-preparation-of-fish-sausage-effects-on-sensory-properties
#16
Amanda M T Lago, Ana C C Vidal, Maria C E V Schiassi, Tatiana Reis, Carlos Pimenta, Maria E S G Pimenta
In this study, we evaluated the effect of minced fish (MF) inclusion on the acceptance of tilapia sausages. One hundred consumers participated in the sensory acceptance test in relation to the attributes appearance, color, aroma, flavor, texture, overall impression, and purchase intent. The tests were conducted using the same composition of ingredients, varying only the raw material (MF and fillet), resulting in 5 different formulations. To represent the results of the sensory attributes, we generated internal preference maps through principal component analysis and parallel factor analysis, as well as frequency histograms...
January 30, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28134355/magnetocaloric-effect-and-negative-thermal-expansion-in-hexagonal-fe-doped-mnnige-compounds-with-a-magnetoelastic-afm-fm-like-transition
#17
Kun Xu, Zhe Li, Enke Liu, Haichun Zhou, Yuanlei Zhang, Chao Jing
We report a detailed study of two successive first-order transitions, including a martensitic transition (MT) and an antiferromagnetic (AFM)-ferromagnetic (FM)-like transition, in Mn1-xFexNiGe (x = 0, 0.06, 0.11) alloys by X-ray diffraction, differential scanning calorimetry, magnetization and linear thermal expansion measurements. Such an AFM-FM-like transition occurring in the martensitic state has seldom been observed in the M(T) curves. The results of Arrott plot and linear relationship of the critical temperature with M(2) provide explicit evidence of its first-order magnetoelastic nature...
January 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28131589/magnetic-solid-phase-extraction-of-typical-polycyclic-aromatic-hydrocarbons-from-environmental-water-samples-with-metal-organic-framework-mil-101-cr-modified-zero-valent-iron-nano-particles
#18
Qingxiang Zhou, Man Lei, Yalin Wu, Yongyong Yuan
Metal-organic framework material has been paid more attention because of its good physical and chemical properties. Nanoscale zero valent iron is also in the center of concern recently. Combination of their merits will give impressive results. Present study firstly synthesized a new magnetic nanomaterial nano-scale zero valent iron-functionalized metal-organic framworks MIL-101 (Fe@MIL-101) by co-precipitation method. The morphology and structure of the as-prepared Fe@MIL-101 were characterized by transmission electron microscopy and X-ray diffraction, etc...
March 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28131012/uniqueness-of-the-anterior-dentition-three-dimensionally-assessed-for-forensic-bitemark-analysis
#19
A Franco, G Willems, Phc Souza, W Coucke, P Thevissen
The uniqueness of the human dentition (UHD) is an important concept in the comparative process in bitemark analysis. During this analysis, the incisal edges of the suspects' teeth are matched with the bitemarks collected from the victim's body or crime scenes. Despite playing an essential part to exclude suspects, the UHD contained in the involved incisal tooth edges remains an assumption on bitemark level. The present study was aimed, first, to investigate three-dimensionally (3D) the UHD within different quantities of dental material from the incisal edges; second, to test these outcomes in a bidimensional (2D) simulation...
February 2017: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/28123095/nature-s-technical-ceramic-the-avian-eggshell
#20
Eric N Hahn, Vincent R Sherman, Andrei Pissarenko, Samuel D Rohrbach, Daniel J Fernandes, Marc A Meyers
Avian eggshells may break easily when impacted at a localized point; however, they exhibit impressive resistance when subjected to a well-distributed compressive load. For example, a common demonstration of material strength is firmly squeezing a chicken egg along its major axis between one's hands without breaking it. This research provides insight into the underlying mechanics by evaluating both macroscopic and microstructural features. Eggs of different size, varying from quail (30 mm) to ostrich (150 mm), are investigated...
January 2017: Journal of the Royal Society, Interface
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