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https://www.readbyqxmd.com/read/29324684/comparative-effect-of-self-or-dual-curing-on-polymerization-kinetics-and-mechanical-properties-in-a-novel-dental-resin-based-composite-with-alkaline-filler-running-title-resin-composites-with-alkaline-fillers
#1
Nicoleta Ilie
Dental bulk-fill restorations with resin-composites (RBC) are increasing in popularity, but doubts concerning insufficient curing in depth still disconcert clinicians. An alternative might be offered by modern dual-cured RBCs, which additionally provide bioactive properties. This study assessed the impact of additional light-curing on polymerization kinetics, the degree of conversion (DC) and mechanical properties of a novel, dual-cured RBC with alkaline fillers. Since the bioactivity of a material often implies a release of compounds, the mechanical stability in simulated clinical environments was also evaluated...
January 11, 2018: Materials
https://www.readbyqxmd.com/read/29322140/development-of-antioxidant-gliadin-particle-stabilized-pickering-high-internal-phase-emulsions-hipes-as-oral-delivery-systems-and-the-in-vitro-digestion-fate
#2
F Z Zhou, T Zeng, S W Yin, C H Tang, D B Yuan, X Q Yang
In this paper, we demonstrate for the first time the use of gliadin particles to structure algal oil (rich in DHA) and to exert chemical stability against lipid oxidation via the Pickering high internal phase emulsion (HIPE) strategy. The gliadin/chitosan colloid particles (GCCPs) were effectively adsorbed and anchored at the algal oil-water interface. Concomitantly, the particle-coated droplets as building blocks constructed a percolating 3D-network framework, endowing Pickering HIPEs with viscoelastic and self-supporting attributes...
January 11, 2018: Food & Function
https://www.readbyqxmd.com/read/29320616/epoxy-nanocomposites-filled-with-carbon-nanoparticles
#3
REVIEW
M Martin-Gallego, V Yuste-Sanchez, R Sanchez-Hidalgo, R Verdejo, M A Lopez-Manchado
Over the past decades, the development of high performance lightweight polymer nanocomposites and, in particular, of epoxy nanocomposites has become one the greatest challenges in material science. The ultimate goal of epoxy nanocomposites is to extrapolate the exceptional intrinsic properties of the nanoparticles to the bulk matrix. However, in spite of the efforts, this objective is still to be attained at commercially attractive scales. Key aspects to achieve this are ultimately the full understanding of network structure, the dispersion degree of the nanoparticles, the interfacial adhesion at the phase boundaries and the control of the localization and orientation of the nanoparticles in the epoxy system...
January 10, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29313519/graphene-nanoplatelets-doping-of-p3ht-pcbm-photoactive-layer-of-bulk-heterojunction-organic-solar-cells-for-enhancing-performance
#4
Brahim Aissa, Mourad Nedil, Jens Kroeger, Adnan Ali, Rima J Isaifan, Rachid Essehli, Khaled Mahmoud
Hybrid organic photovoltaic (OPV) cells based on conjugated polymers photoactive materials are promising candidates for flexible, high-performance and low-cost energy sources owing to their inexpensive materials, cost-effective processing, and ease of fabrication by simple solution processes. However, the modest PV performance obtained to date -in particular the low power conversion efficiency (PCE)- has impeded the large scale deployment of OPV cells. The low PCE in OPV solar cells has been mainly attributed to low carrier mobility, which is closely correlated to the transport diffusion length of the charge carriers within the photoactive layers...
January 9, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29309328/a-new-option-for-the-reconstruction-of-primary-or-recurrent-ischial-pressure-sores-hamstring-adductor-magnus-muscle-advancement-flap-and-direct-closure
#5
Jin Sik Burm, Jungil Hwang, Yung Ki Lee
BACKGROUND: Owing to the high recurrence rates of ischial pressure sores, surgeons should consider the possibility of future secondary flap surgery during flap selection. The purpose of this article is to present a new surgical option for the reconstruction of primary or recurrent ischial pressure sores using a simple hamstring-adductor magnus advancement flap and direct closure. METHODS: After horizontal fusiform skin excision, complete bursa excision and ischiectomy were performed...
January 5, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29303852/interpositional-arthroplasty-by-temporalis-fascia-flap-and-galea-aponeurotica-combined-with-distraction-osteogenesis-a-modified-method-in-treatment-of-adult-patients-with-temporomandibular-joint-ankylosis-and-mandibular-dysplasia
#6
Jia Qiao, Bing Yu, Lai Gui, Xi Fu, Chung-Kwan Yen, Feng Niu, Huijun Zhang, Cai Wang, Ying Chen, Meng Wang, Jianfeng Liu
BACKGROUND: Interpositional arthroplasty (IPA) with temporalis fascia flap has been one of the most frequently performed procedures to treat temporomandibular joint (TMJ) ankylosis. However, recurrence often occurs when the flap lacks bulk or atrophies. Whether to perform IPA or distraction osteogenesis (DO) first has long been a controversial issue when patients presented mandibular dysplasia (MD). This study provided IPA a new graft material sufficient to prevent recurrence, combined the modified protocol of performing DO 6 months after IPA, and evaluated its efficacy in treating TMJ ankylosis patients with MD...
January 4, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29286745/-d-2-dimensional-edge-states-of-rotation-symmetry-protected-topological-states
#7
Zhida Song, Zhong Fang, Chen Fang
We study fourfold rotation-invariant gapped topological systems with time-reversal symmetry in two and three dimensions (d=2, 3). We show that in both cases nontrivial topology is manifested by the presence of the (d-2)-dimensional edge states, existing at a point in 2D or along a line in 3D. For fermion systems without interaction, the bulk topological invariants are given in terms of the Wannier centers of filled bands and can be readily calculated using a Fu-Kane-like formula when inversion symmetry is also present...
December 15, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29284100/cuspal-deflection-in-premolar-teeth-restored-with-bulk-fill-resin-based-composite-materials
#8
M M Elsharkasi, J A Platt, N B Cook, G H Yassen, B A Matis
The present study investigated the effect of three high-viscosity bulk-fill resin-based composite materials on cuspal deflection in natural teeth. Thirty-two sound maxillary premolar teeth with large slot mesio-occlusal-distal cavities were distributed into four groups (n=8). Three groups were restored with bulk-fill resin composite materials (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent, Schaan, Liechtenstein; x-tra fil, VOCO, Cuxhaven, Germany; and SonicFill, Kerr, Orange, CA, USA) in a single 4-mm increment...
January 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29284096/real-time-light-transmittance-monitoring-for-determining-polymerization-completeness-of-conventional-and-bulk-fill-dental-composites
#9
M Par, I Repusic, H Skenderovic, E Klaric Sever, D Marovic, Z Tarle
OBJECTIVES: To monitor the real-time changes in light transmittance during composite curing and to use transmittance data to determine the curing times required for a complete polymerization. METHODS: Three conventional and three bulk fill composites were cured with two light-emitting diode curing units at layer thicknesses of 2 mm and 4 mm. The real-time light transmittance data were collected by a UV-Vis spectrometer in the wavelength range of 350-550 nm, plotted against time (t) and fitted to an exponential function f(t), whose first derivative ΔT(t) = df(t)/dt represented the rate of transmittance change...
January 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29279622/evaluation-of-effect-of-different-disposable-infection-control-barriers-on-light-intensity-of-light-curing-unit-and-microhardness-of-composite-an-in-vitro-study
#10
Rajiv Tarachand Khode, Pratima Ramakrishna Shenoi, Rajesh R Kubde, Chetana S Makade, Kanchan D Wadekar, Priyanka Tarachand Khode
Aims: This study evaluated effect of infection control barriers on light intensity (LI) of light-curing unit (LCU) and microhardness of composite. Materials and Methods: Four different disposable barriers (n = 30) were tested against the control. LI for each barrier was measured with Lux meter. One hundred and fifty Teflon molds were equally divided into five groups of thirty each. Composite was filled in bulk in these molds and cured without and with barrier. Microhardness was evaluated on top and bottom surface of composite specimen with microhardness testing machine and hardness ratio (HR) was derived...
May 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29251454/effects-of-cigarette-smoking-on-color-stability-of-dental-resin-composites
#11
Xiaoyi Zhao, Filippo Zanetti, Shoaib Majeed, Jie Pan, Hans Malmstrom, Manuel C Peitsch, Julia Hoeng, Yanfang Ren
PURPOSE: To evaluate the effect of simulated toothbrush abrasion on the surface gloss, the surface roughness and the color stability of incrementally-filled and bulk-fill composites. METHODS: 48 dimensionally standardized composite specimens (n= 8/group) were made from four incrementally-filled composites (Tetric EvoCeram, IPS Empress Direct Enamel, Ceram X mono and Arabesk) and two bulk-fill composites (Quix fil and Tetric EvoCeram Bulk). Before and after toothbrushing simulation the surface gloss was measured by a glossmeter, the surface roughness was evaluated with a profilometer, and the color was measured using a spectrophotometer...
December 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29248213/effect-of-leaving-milk-trucks-empty-and-idle-for-6-h-between-raw-milk-loads
#12
Eva Kuhn, Lisbeth Meunier-Goddik, Joy G Waite-Cusic
The US Pasteurized Milk Ordinance (PMO) allows milk tanker trucks to be used repeatedly for 24 h before mandatory clean-in-place cleaning, but no specifications are given for the length of time a tanker can be empty between loads. We defined a worst-case hauling scenario as a hauling vessel left empty and dirty (idle) for extended periods between loads, especially in warm weather. Initial studies were conducted using 5-gallon milk cans (pilot-scale) as a proof-of-concept and to demonstrate that extended idle time intervals could contribute to compromised raw milk quality...
December 13, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29247944/sorption-mechanisms-of-neonicotinoids-on-biochars-and-the-impact-of-deashing-treatments-on-biochar-structure-and-neonicotinoids-sorption
#13
Peng Zhang, Hongwen Sun, Chao Ren, Lujuan Min, Huiming Zhang
To elucidate the sorption affinity of biochars for neonicotinoid pesticides and the influence of biochar structure on sorption mechanisms therein, 24 biochar samples were obtained by pyrolyzing maize straw and pig manure at pyrolyzing temperatures (PTs) of 200-700 °C and by further deashing them using acids, and the sorption of three typical neonicotinoids, imidacloprid, clothianidin and thiacloprid on untreated and acid-deashed biochars were evaluated. All the biochar samples could efficiently adsorb the three neonicotinoids and multiple mechanisms were involved in sorption...
December 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29244505/drainage-from-a-fluid-handling-component-because-of-inclination
#14
C W Extrand
The onset of drainage of liquids from fluid-handling components with a single, circular orifice was evaluated. A component was filled with water, ethylene glycol, or ethyl alcohol and then oriented vertically with its orifice facing downward. The lower end of the component was slowly tilted toward the horizon. No flow occurred until a critical angle of inclination was reached. The onset of drainage was successfully modeled as a balance between the hydrostatic pressure in the bulk liquid and the Laplace pressure of the air-liquid interface within the orifice...
December 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29235849/all-small-molecule-solar-cells-incorporating-ndi-based-acceptors-synthesis-and-full-characterization
#15
Jisu Hong, Yeon Hee Ha, Hyojung Cha, Ran Kim, Yu Jin Kim, Chan Eon Park, James R Durrant, Soon-Ki Kwon, Tae Kyu An, Yun-Hi Kim
A series of naphthalene diimide (NDI)-based small molecules were synthesized as nonfullerene acceptors and incorporated in all-small-molecule solar cells. Three NDI-based small molecules, NDICN-T, NDICN-BT, and NDICN-TVT, were designed with different linkers between two NDI units to induce the different conjugation length and modulate the geometric structures of the NDI dimers. The small NDI-based dimer electron acceptors with slip-stacked structures that facilitate π-π stacking interactions and/or hinder excessive aggregation exhibited different morphological behaviors, such as miscibility or crystallinity in bulk heterojunction blends with 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b']dithiophene-2,6-diyl)bis(6-fluoro-4-(5'-hexyl-[2,2'-bithiophen]-5-yl)benzo[c][1,2,5]thiadiazole) (DTS-F) electron donors...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29219581/quantized-magnetization-density-in-periodically-driven-systems
#16
Frederik Nathan, Mark S Rudner, Netanel H Lindner, Erez Berg, Gil Refael
We study micromotion in two-dimensional periodically driven systems in which all bulk Floquet eigenstates are localized by disorder. We show that this micromotion gives rise to a quantized time-averaged orbital magnetization density in any region completely filled with fermions. The quantization of magnetization density has a topological origin, and reveals the physical nature of the new phase identified in P. Titum, E. Berg, M. S. Rudner, G. Refael, and N. H. Lindner [Phys. Rev. X 6, 021013 (2016)PRXHAE2160-330810...
November 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29219365/unconventional-chiral-fermions-and-large-topological-fermi-arcs-in-rhsi
#17
Guoqing Chang, Su-Yang Xu, Benjamin J Wieder, Daniel S Sanchez, Shin-Ming Huang, Ilya Belopolski, Tay-Rong Chang, Songtian Zhang, Arun Bansil, Hsin Lin, M Zahid Hasan
The theoretical proposal of chiral fermions in topological semimetals has led to a significant effort towards their experimental realization. In particular, the Fermi surfaces of chiral semimetals carry quantized Chern numbers, making them an attractive platform for the observation of exotic transport and optical phenomena. While the simplest example of a chiral fermion in condensed matter is a conventional |C|=1 Weyl fermion, recent theoretical works have proposed a number of unconventional chiral fermions beyond the standard model which are protected by unique combinations of topology and crystalline symmetries...
November 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29215170/synthetic-light-curable-polymeric-materials-provide-a-supportive-niche-for-dental-pulp-stem-cells
#18
Kyle H Vining, Jacob C Scherba, Alaina M Bever, Morgan R Alexander, Adam D Celiz, David J Mooney
Dental disease annually affects billions of patients, and while regenerative dentistry aims to heal dental tissue after injury, existing polymeric restorative materials, or fillings, do not directly participate in the healing process in a bioinstructive manner. There is a need for restorative materials that can support native functions of dental pulp stem cells (DPSCs), which are capable of regenerating dentin. A polymer microarray formed from commercially available monomers to rapidly identify materials that support DPSC adhesion is used...
December 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29208783/clinical-time-required-and-internal-adaptation-in-cavities-restored-with-bulk-fill-composites
#19
Marcos Gabriel Vianna-de-Pinho, Guilherme Ferreira Rego, Marina Lermenn Vidal, Roberta Caroline Bruschi Alonso, Luis Felipe Jochims Schneider, Larissa Maria Cavalcante
AIM: The aim of this study was to compare the restorative time required and the internal adaptation after thermomechanical aging of class I restorations using either the conventional incremental technique or bulk-fill technique. MATERIALS AND METHODS: Cavities (Class I) were prepared on the occlusal surface of human third molars. 40 teeth were divided into four experimental groups according to the restorative technique (n = 10): G1 = 3 mm increment of Surefill SDR Flow + 1 mm Filtek P60; G2 = 3 mm increment of Filtek Bulk-Fill + 1 mm Filtek P60; G3 = Filtek P60 inserted with incremental technique; G4 = 3 mm increment of Filtek Z350 Flow XT + 1 mm increment of Filtek P60...
December 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29205770/effect-of-tooth-brushing-on-gloss-retention-and-surface-roughness-of-five-bulk-fill-resin-composites
#20
Catherine O'Neill, Laurent Kreplak, Frederick A Rueggeberg, Daniel Labrie, Carlos Alberto Kenji Shimokawa, Richard Bengt Price
OBJECTIVES: To determine the effects of tooth brushing on five bulk-fill resin based composites (RBCs). METHOD: Ten samples of Filtek Supreme Enamel (control), Filtek One Bulk Fill, Tetric EvoCeram Bulk Fill, SonicFill 2, SDR flow+, and Admira Fusion X-tra were light cured for 20 seconds using the Valo Grand curing light. After 24 hours storage in air at 37°C, specimens were brushed in a random order using Colgate OpticWhite dentifrice and a soft toothbrush. Surface gloss was measured prior to brushing, after 5,000, 10,000 and 15,000 back and forth brushing cycles...
December 5, 2017: Journal of Esthetic and Restorative Dentistry
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