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https://www.readbyqxmd.com/read/29349910/accuracy-of-a-new-elastomeric-impression-material-for-complete-arch-dental-implant-impressions
#1
Mirza R Baig, Muaiyed M Buzayan, Norsiah Yunus
AIM: The aim of the present study was to assess the accuracy of multi-unit dental implant casts obtained from two elastomeric impression materials, vinyl polyether silicone (VPES) and polyether (PE), and to test the effect of splinting of impression copings on the accuracy of implant casts. METHODS: Forty direct impressions of a mandibular reference model fitted with six dental implants and multibase abutments were made using VPES and PE, and implant casts were poured (N = 20)...
January 18, 2018: Journal of Investigative and Clinical Dentistry
https://www.readbyqxmd.com/read/29346719/a-tunable-molten-salt-route-for-scalable-synthesis-of-ultrathin-amorphous-carbon-nanosheets-as-high-performance-anode-materials-for-lithium-ion-batteries
#2
Yixian Wang, Wei Tian, Luhai Wang, Haoran Zhang, Jialiang Liu, Tingyue Peng, Lei Pan, Xiaobo Wang, Mingbo Wu
Amorphous carbon is regarded as a promising alternative to commercial graphite as the lithium-ion battery anode due to its capability to reversibly store more lithium ions. However, the structural disorder with a large number of defects can lead to low electrical conductivity of the amorphous carbon, thus limiting its application for high power output. Herein, ultrathin amorphous carbon nanosheets were prepared from petroleum asphalt through tuning the carbonization temperature in a molten-salt medium. The amorphous nanostructure with expanded carbon interlayer spacing can provide substantial active sites for lithium storage while the two-dimensional (2D) morphology can facilitate fast electrical conductivity...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29346404/bio-fortification-potential-of-global-wild-annual-lentil-core-collection
#3
Sandeep Kumar, Anil Kumar Choudhary, Kuldeep Singh Rana, Ashutosh Sarker, Mohar Singh
Lentil, generally known as poor man's' meat due to its high protein value is also a good source of dietary fiber, antioxidants and vitamins along with fast cooking characteristics. It could be used globally as a staple food crop to eradicate hidden hunger, if this nutritionally rich crop is further enriched with essential minerals. This requires identification of essential mineral rich germplasm. So, in the present study, a core set of 96 wild accessions extracted from 405 global wild annual collections comprising different species was analyzed to determine its bio-fortification potential...
2018: PloS One
https://www.readbyqxmd.com/read/29345220/tissue-impression-smears-as-a-supplementary-diagnostic-method-for-histopathology-in-cutaneous-leishmaniasis-in-sri-lanka
#4
Nuwani H Manamperi, M Vipula C de Silva, Nishantha Pathirana, Wimal Abeyewickreme, Nadira D Karunaweera
Cutaneous leishmaniasis (CL) is diagnosed mainly by light microscopy of smears made using lesion material. Histopathology is usually done in atypical presentations or when lesion smears are negative. Tissue impression smears (TIS) made from skin biopsy specimens were compared with histopathology for the diagnosis of CL. Out of the 111 patients included, 83 (74.8%) were positive by either methods. The TIS was positive in 70.3% whereas histopathology was positive in 56.8% of patients. Tissue impression smears can be used as a supplementary diagnostic test that gives sensitive and rapid results when tissue biopsies are used as the source of lesion material for diagnosis of CL...
January 15, 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29336071/hierarchical-n-rich-carbon-sponge-with-excellent-cycling-performance-for-lithium-sulfur-battery-at-high-rates
#5
Cheng Wang, Mengmeng Zhen, Juan Wang, Xin Wang
Lithium-sulfur batteries (LSBs) are receiving extensive attention because of their high theoretical energy density. However, practical applications of LSBs are still hindered by the rapid capacity decay and short cycle life, especially at high rates. Herein, a highly N-doped (~13.42 at%) hierarchical carbon sponge (HNCS) having strong chemical adsorptions toward lithium polysulfide was fabricated by a simple sol-gel route followed with carbonization. When using the HCNS as the sulfur host material in cathode and HNCS-coated separator as separator, the battery delivers an excellent cycling stability with high specific capacities of 424/326 mAh g-1, low capacity fading rates of 0...
January 15, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29322634/structure-property-relations-in-carbon-nanotube-fibers-by-downscaling-solution-processing
#6
Robert J Headrick, Dmitri E Tsentalovich, Julián Berdegué, Elie Amram Bengio, Lucy Liberman, Olga Kleinerman, Matthew S Lucas, Yeshayahu Talmon, Matteo Pasquali
At the microscopic scale, carbon nanotubes (CNTs) combine impressive tensile strength and electrical conductivity; however, their macroscopic counterparts have not met expectations. The reasons are variously attributed to inherent CNT sample properties (diameter and helicity polydispersity, high defect density, insufficient length) and manufacturing shortcomings (inadequate ordering and packing), which can lead to poor transmission of stress and current. To efficiently investigate the disparity between microscopic and macroscopic properties, a new method is introduced for processing microgram quantities of CNTs into highly oriented and well-packed fibers...
January 11, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29315933/an-alkylated-indacenodithieno-3-2-b-thiophene-based-nonfullerene-acceptor-with-high-crystallinity-exhibiting-single-junction-solar-cell-efficiencies-greater-than-13-with-low-voltage-losses
#7
Zhuping Fei, Flurin D Eisner, Xuechen Jiao, Mohammed Azzouzi, Jason A Röhr, Yang Han, Munazza Shahid, Anthony S R Chesman, Christopher D Easton, Christopher R McNeill, Thomas D Anthopoulos, Jenny Nelson, Martin Heeney
A new synthetic route, to prepare an alkylated indacenodithieno[3,2-b]thiophene-based nonfullerene acceptor (C8-ITIC), is reported. Compared to the reported ITIC with phenylalkyl side chains, the new acceptor C8-ITIC exhibits a reduction in the optical band gap, higher absorptivity, and an increased propensity to crystallize. Accordingly, blends with the donor polymer PBDB-T exhibit a power conversion efficiency (PCE) up to 12.4%. Further improvements in efficiency are found upon backbone fluorination of the donor polymer to afford the novel material PFBDB-T...
January 9, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29314375/indaceno-based-conjugated-polymers-for-polymer-solar-cells
#8
REVIEW
Yuli Yin, Yong Zhang, Liancheng Zhao
Polymer solar cells have received considerable attention due to the advantages of low material cost, tunable band gaps, ultralight weight, and high flexible properties, and they have been a promising organic photovoltaic technology for alternative non-renewable fossil fuels for the past decade. Inspired by these merits, numerous state-of-the-art organic photovoltaic materials have been constructed. Among them, indaceno-based polymer materials have made an impact in obtaining an impressive power conversion efficiency of more than 11%, which shows the momentous potential of this class of materials for commercial applications...
January 4, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29310874/disinfection-of-polyvinyl-siloxane-impression-material-by-gaseous-ozone
#9
Hakki Celebi, Emine Begüm Büyükerkmen, Emrah Torlak
STATEMENT OF PROBLEM: Impression materials must be disinfected to avoid cross-contamination before they are sent to the dental laboratory. However, whether aqueous state disinfectants affect material wettability is unclear. PURPOSE: The purpose of this in vitro study was to compare the efficacy of gaseous ozone and sodium hypochlorite (NaOCl) in disinfecting light-body consistency hydrophilized polyvinyl siloxane (PVS) impression specimens inoculated with a cocktail of Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Enterococcus faecalis...
January 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29303242/enhancing-thermoelectric-performances-of-bismuth-antimony-telluride-via-synergistic-combination-of-multi-scale-structuring-and-band-alignment-by-fete2-incorporation
#10
Weon Ho Shin, Jong Wook Roh, Byungki Ryu, Hye Jung Chang, Hyun Sik Kim, Soonil Lee, Won-Seon Seo, Kyunghan Ahn
It has been in difficulty in forming well-distributed nano- and meso-sized inclusions in a Bi2Te3-based matrix and thereby realizing no degradation of carrier mobility at interfaces between matrix and inclusions for high thermoelectric performances. Herein, we successfully synthesize multi-structured thermoelectric Bi0.4Sb1.6Te3 materials with Fe-rich nano-precipitates and sub-micron sized FeTe2 inclusions by a conventional solid state reaction followed by melt-spinning and spark plasma sintering that could be a facile preparation method for scale-up production...
January 5, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29302293/orthodontics-and-veneers-to-restore-the-anterior-guidance-a-minimally-invasive-approach
#11
Vicente Faus-Matoses, Ignacio Faus-Matoses, Ana Jorques-Zafrilla, Vicente J Faus-Llácer
Tooth wear is defined as the progressive loss of a tooth's surface due to actions other than those which cause tooth decay or dental trauma. It is a pathological condition with an increasing prevalence among young people. The aim of this article is to describe an alternative treatment modality to rehabilitate the anterior guidance by a minimally invasive interdisciplinary ortho-restorative treatment. Two patients came to the dental clinic for restorative treatment in order to rehabilitate the worn anterior dentition...
November 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29286215/inter-and-intra-observer-variability-in-diagnosis-of-oral-dysplasia
#12
Shubhasini A R, Praveen B N, Usha Hegde, Uma K, Shubha G, Keerthi G, Shiladitya Sil
Background: Oral potentially malignant disorders (OPMDs) are lesions from which malignancy is more likely to develop that from other tissues. The potential for malignant transformation of OPMDs is estimated by determining the degree of dysplastic changes in the epithelium. Dysplasia grading has been criticized for lack of reproducibility and poor predictive value but is still considered the gold standard for diagnosing OPMDs. Since grading of dysplasia is based on architectural and cytological changes, there can be considerable inter- and intra-observer variability due to subjective impressions...
December 29, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/29286181/accuracy-of-different-implant-impression-techniques-evaluation-of-new-tray-design-concept
#13
David Yu Liu, Fathima Nashmie Cader, Jaafar Abduo, Joseph Palamara
PURPOSE: To evaluate implant impression accuracy with a new tray design concept in comparison to nonsplinted and splinted impression techniques for a 2-implant situation. MATERIALS AND METHODS: A reference bar titanium framework was fabricated to fit on 2 parallel implants. The framework was used to generate a resin master model with 2 implants that fit precisely against the framework. Three impression techniques were evaluated: (1) nonsplinted, (2) splinted, and (3) nonsplinted with modified tray impressions...
December 29, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29284952/an-evaluation-of-the-effect-of-various-gloves-on-polymerization-inhibition-of-elastomeric-impression-materials-an-in-vitro-study
#14
Vinuta Hiremath, G Vinayakumar, Mallikarjuna Ragher, Sounyala Rayannavar, Mahantesh Bembalagi, B L Ashwini
Background: Latex protective barriers such as gloves and rubber dam material have been used widely in restorative procedures for crown and bridge. However, the chemical used during latex glove fabrication is thought to inhibit the polymerization of elastomeric impression materials used for impression making which has a detrimental effect on the dimensional accuracy and surface definition of resultant casts used for restorative procedures. The objectives of the study were to examine the surface of different elastomeric impressions on contact with various gloves...
November 2017: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/29280075/effect-of-flapless-ridge-preservation-with-two-different-alloplastic-materials-in-sockets-with-buccal-dehiscence-defects-volumetric-and-linear-changes
#15
Nadja Naenni, Vitor Sapata, Stefan P Bienz, Minas Leventis, Ronald E Jung, Christoph H F Hämmerle, Daniel S Thoma
OBJECTIVE: To test whether or not one out of two alloplastic materials used for ridge preservation (RP) is superior to the other in terms of volumetric and linear ridge changes over time. MATERIALS AND METHODS: In 16 adult beagle dogs, the distal roots of P3 and P4 were extracted and 50% of the buccal bone plate removed. Ridge preservation was performed randomly using two different alloplastic bone grafting substitutes (poly lactic-co-glycolic acid (PLGA) coated biphasic calcium phosphate particles consisting of 60% hydroxyapatite (HA) and 40% beta-tricalcium phosphate (ß-TCP=test 1), (a biphasic calcium phosphate consisting 60% HA and 40% ß-TCP=test 2) and a resorbable collagen membrane or a control group (sham)...
December 26, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29278486/mesh-embedded-polysulfone-psu-sulfonated-polysulfone-spsu-supported-thin-film-composite-membranes-for-forward-osmosis
#16
Yuntao Zhao, Xiao Wang, Yiwei Ren, Desheng Pei
In this work, mesh-embedded polysulfone (PSU)/sulfonated polysulfone (sPSU) supported thin film composite (TFC) membranes were developed for forward osmosis (FO). The robust mesh integrated in PSU/sPSU sublayer imparts impressive mechanical durability. The blending of hydrophilic sPSU in PSU sublayer affects the hydrophilicity, porosity, pore structure and pore size of mesh-embedded PSU/sPSU substrates, and the total thickness, crosslinking degree and roughness of the corresponding TFC-FO membrane active layers...
December 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29277738/cellulose-nanomaterials-as-green-nanoreinforcements-for%C3%A2-polymer-nanocomposites
#17
REVIEW
Alain Dufresne
Unexpected and attractive properties can be observed when decreasing the size of a material down to the nanoscale. Cellulose is no exception to the rule. In addition, the highly reactive surface of cellulose resulting from the high density of hydroxyl groups is exacerbated at this scale. Different forms of cellulose nanomaterials, resulting from a top-down deconstruction strategy (cellulose nanocrystals, cellulose nanofibrils) or bottom-up strategy (bacterial cellulose), are potentially useful for a large number of industrial applications...
February 13, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29260813/constructing-a-novel-strategy-for-controllable-synthesis-of-corrosion-resistant-ti3-self-doped-titanium-silicon-materials-with-efficient-hydrogen-evolution-activity-from-simulated-seawater
#18
Ting Song, Piyong Zhang, Tingting Wang, Atif Ali, Heping Zeng
Exploiting solar power for hydrogen production from seawater is a great challenge owing to the corrosive properties of seawater and inadequate visible-light conversion capabilities. Here we report an uncomplicated post-processing method to construct Ti3+ self-doped titanium-silicon material with corrosion resistance. This is a new experimental method to regulate the electrical, optical, and photocatalytic performances of titanium-containing photocatalysts in a controlled way. Moreover, we demonstrate that Ti-O-Si materials with different calcination temperatures can serve as a highly efficient and convenient catalyst for photogeneration of hydrogen from water and simulated seawater...
December 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/29248944/surface-wear-of-resin-composites-used-for-invisalign%C3%A2-attachments
#19
Graciela J Barreda, Elizabeth A Dzierewianko, Karina A Muñoz, Gisela I Piccoli
Orthodontic treatments with Invisalign® require the use of attachments, which are composite resin buttons attached to tooth surfaces. Attachments constitute one of the most powerful tools for improving the efficiency of orthodontic tooth movement. The main purpose of this study was to evaluate surface wear over six months in two resin composites (Filtek Z350 XT, 3MESPE and Amelogen Plus TW, Ultradent Products Inc. ) used for making Invisalign® attachments. These composites were selected for their esthetic and mechanical properties...
August 2017: Acta Odontológica Latinoamericana: AOL
https://www.readbyqxmd.com/read/29248812/n-s-b-doped-graphitized-carbon-encased-fe-species-as-a-highly-active-and-durable-catalyst-towards-oxygen-reduction-reaction
#20
Guang-Lan Li, Guang-Chun Cheng, Wen-Wen Chen, Cai-Di Liu, Li-Fang Yuan, Bei-Bei Yang, Ce Hao
Exploring cost-effective, high-performance and durable non-precious metal catalysts is of great significance for the acceleration of sluggish oxygen reduction reaction (ORR). Here, we report an intriguing heteroatom-doped graphitized carbon encased Fe species composite by introducing N, S and B sequentially. The experimental approach was designed ingeniously for that the FeCl3·6H2O could catalyze thiourea to synthesize N, S co-doped carbon materials which would further react with H3BO3 and NH3 (emerged at the heat-treatment process) to prepare N, S and B co-doped carbon materials (Fe-N/S/B-C)...
December 5, 2017: Journal of Colloid and Interface Science
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