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https://www.readbyqxmd.com/read/29691551/-experimental-research-of-hot-alkaline-solution-etching-treatment-on-zirconia-resin-bonding-strength
#1
Li-Yang Wan, Hong-Shui Zhu
PURPOSE: In this experiment, we applied hot alkaline solution (20%NaOH solutions) to treat the surfaces of zirconia ceramics in vitro, then evaluated the changes of bond strength of zirconia ceramics and resin cement. METHODS: Eighteen pieces of zirconia ceramic specimens were made, using the same method of grinding and polishing, and then randomly divided them into 3 groups: group A with hot alkali solution treatment (20%NaOH) (n=6), group B underwent sand blasting with a diameter of 110 ?m alumina particles (n=6), group C was as the control group...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29691030/an-investigation-on-the-effect-of-polyphenolic-extracts-of-nigella-sativa-seedcake-on-physicochemical-properties-of-chitosan-based-films
#2
Deepak Kadam, Nirali Shah, Shanooba Palamthodi, S S Lele
Nigella sativa seedcake phenolic extract (NSE), as compared to tannic acid (TA), was evaluated for its effect on film-forming ability of chitosan. These films were evaluated for their tensile strength, elongation, water vapor permeability (WVP), type of bonding, color, surface morphology, polyphenol and in vitro antioxidant activity release profile. At 7.5% (v/v of film-forming solution), NSE led to 42% decrease in tensile strength but improved the elongation by 66%, contradicting the effect of TA in chitosan films...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29690698/-application-of-plasma-sprayed-zirconia-coating-in-dental-implant-study-in-implant
#3
Z F Huang, Z F Wang, C H Li, D Hao, J Lan
Objective: To investigate the osseointegration of a novel coating-plasma-sprayed zirconia in dental implant. Methods: Zirconia coating on non-thread titanium implant was prepared using plasma spraying, the implant surface morphology, surface roughness and wettability were measured. In vivo , zirconia coated implants were inserted in rabbit tibia and animals were respectively sacrificed at 2, 4, 8 and 12 weeks after implantation. The bond strength between implant and bone was measured by push-out test. The osseointegration was observed by scanning electron microscopy (SEM), micro CT and histological analyses...
April 9, 2018: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/29690690/-advantages-and-disadvantages-of-endocrown-restorations-of-endodontically-treated-teeth-with-large-coronal-destruction
#4
X D Bao
The strength of endodontically treated teeth were reduced apparently because of structural damage, therefore further reduction of healthy tissue should be avoided as much as possible in restoration. Endocrown made by chair-side CAD/CAM is some kind of minimal invasive restoration, and the retention of restoration is achieved by reliable bonding and macromechanial retention forces. Without post preparation, the root structure could be resevered. Following the indications and use of biomechanical dentin-like CAD/CAM materials could reduce the adverse effect of tensile stress on cervical part...
April 9, 2018: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/29690506/polyvinyl-alcohol-microspheres-reinforced-thermoplastic-starch-composites
#5
Bin Guo, Dongdong Zha, Bengang Li, Peng Yin, Panxin Li
We reported a new method to prepare polyvinyl alcohol (PVA)/thermoplastic starch (TPS) composites by using polyvinyl alcohol microspheres (PVAMS). The PVAMS/TPS composites were characterized using tensile test, scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). The results exhibited that adding small amounts of PVAMSs can effectively improve the mechanical strength and toughness of the composites, especially for the 1 wt %PVAMS in TPS matrix, with a tensile strength of 3...
April 21, 2018: Materials
https://www.readbyqxmd.com/read/29689529/iron-and-manganese-oxides-modified-maize-straw-to-remove-tylosin-from-aqueous-solutions
#6
Yongyuan Yin, Xuetao Guo, Dan Peng
Maize straw modified by iron and manganese oxides was synthesized via a simple and environmentally friendly method. Three maize straw materials, the original maize straw, maize straw modified by manganese oxides and maize straw modified by iron and manganese oxides, were detected by SEM, BET, XPS, XRD and FTIR. The results showed that maize straw was successfully modified and maize straw modified by iron and manganese oxides has a larger surface area than MS. According to the experimental data, the sorption trend could conform to the pseudo-second-order kinetic model well, and the sorption ability of tylosin on sorbents followed the order of original maize straw < maize straw modified by manganese oxides < maize straw modified by iron and manganese oxides...
April 19, 2018: Chemosphere
https://www.readbyqxmd.com/read/29688732/hydrogen-bond-networks-near-supported-lipid-bilayers-from-vibrational-sum-frequency-generation-experiments-and-atomistic-simulations
#7
Merve Dogangun, Paul E Ohno, Dongyue Liang, Alicia C McGeachy, Ariana Gray Bé, Naomi Dalchand, Tianzhe Li, Qiang Cui, Franz M Geiger
We report vibrational sum frequency generation (SFG) spectra in which the C-H stretches of lipid alkyl tails in fully hydrogenated single- and dual-component supported lipid bilayers are detected along with the O-H stretching continuum above the bilayer. As the salt concentration is increased from ~10 µM to 0.1 M, the SFG intensities in the O-H stretching region decrease by a factor of 2, consistent with significant absorptive-dispersive mixing between χ(2) and χ(3) contributions to the SFG signal generation process from charged interfaces...
April 24, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29688008/first-report-on-the-separation-of-trivalent-lanthanides-from-trivalent-actinides-using-an-aqueous-soluble-multiple-n-donor-ligand-2-6-bis-1-h-tetrazol-5-yl-pyridine-extraction-spectroscopic-structural-and-computational-studies
#8
Arunasis Bhattacharyya, Trilochan Gadly, Avinash S Kanekar, Sunil K Ghosh, Mukesh Kumar, Prasanta K Mohapatra
A terdentate multiple N donor ligand, 2,6-bis(1 H-tetrazol-5-yl)pyridine (H2 BTzP), was synthesized, and its complexation with trivalent americium, neodymium, and europium was studied using single-crystal X-ray diffraction, attenuated total reflectance-fourrier transform infrared spectroscopy, time-resolved fluorescence spectroscopy, UV-vis absorption spectrophotometry. Higher complexation strength of BTzP toward trivalent actinide over lanthanides as observed from UV-vis spectrophotometric study resulted in an effective separation of Am3+ and Eu3+ in liquid-liquid extraction studies employing N,N, N',N'-tetra- n-octyl diglycolamide in the presence of BTzP as the aqueous complexant...
April 24, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29687988/two-dimensional-aumx2-m-al-ga-in-x-s-se-monolayers-featuring-intracrystalline-aurophilic-interactions-with-novel-electronic-and-optical-properties
#9
Qisheng Wu, Wen Wu Xu, Liang Ma, Jinlan Wang, Xiao Cheng Zeng
Aurophilicity, known as aurophilic interaction, is a strong attractive van der Waals interaction between cationic gold(I) centers, whose strength is comparable to the hydrogen bond. Here, we show that aurophilicity can serve as an engineering approach to expand structural dimensionality for nanomaterials design. Specifically, based on a global-structure search method and density functional theory calculations, we predict a series of stable two-dimensional (2D) AuMX2 (M=Al, Ga, In; X=S, Se) structures featuring intracrystalline aurophilic interactions...
April 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29687802/ab-initio-investigation-of-the-ground-and-excited-states-of-moo-2-and-their-catalytic-strength-on-water-activation
#10
Isuru R Ariyarathna, Evangelos Miliordos
The charged molybdenum monoxides, MoO+,2+,- were studied by multireference configuration interaction and coupled cluster calculations in conjunction with large basis sets. Full potential energy curves were constructed and bonding patterns were proposed for several low-lying electronic states of the three species. Our numerical results involve accurate equilibrium bond lengths, harmonic vibrational frequencies, anharmonicities, excitation energies, and binding energies. This is the first high-level theoretical investigation and our results compare favorably with the limited existing experimental data...
April 24, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29687134/low-energy-3d-sp-2-carbons-with-versatile-properties-beyond-graphite-and-graphene
#11
Meng Hu, Xiao Dong, Yingju Wu, Lingyu Liu, Zhisheng Zhao, Xiang-Feng Zhou, Timothy A Strobel, Guoying Gao, Yongjun Tian, Julong He
Carbon materials with full sp2-hybridized bonding, e.g. zero-dimensional (0D) fullerenes, 1D carbon nanotubes, and 2D graphene, possess outstanding and unparalleled properties, and have unique scientific and technological importance. The theoretical design and experimental exploration of other types of novel sp2 carbon allotropes, especially with 3D architectures, is always a compelling scientific theme. Here we proposed a class of low-energy 3D sp2 carbons with exceptional properties, not only possessing excellent mechanical properties such as high 3D strength, rubber-like ultra-stretchability, and negative Poisson's ratio, but also including the electronic properties of graphite-like metallicity and graphene-like Dirac cone, which are the desirable properties across a broad range of potential applications...
April 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29685085/micronomicin-tobramycin-binding-with-dna-fluorescence-studies-using-of-ethidium-bromide-as-a-probe-and-molecular-docking-analysis
#12
Shuyun Bi, Huifeng Zhou, Jun Wu, Xiaoyue Sun
Two aminoglycosides, micronomicin (MN), and tobramycin (TB), binding with DNA were studied using various spectroscopic techniques including fluorescence, UV-Vis, FT-IR, and CD spectroscopy coupled with relative viscosity and molecular docking. Studies of fluorescence quenching and time-resolved fluorescence spectroscopy all revealed that MN/TB quenching the fluorescence of DNA-EB belonged to static quenching. The binding constants and binding sites were obtained. The values of ΔH, ΔS, and ΔG suggested that van der Waals force or hydrogen bond might be the main binding force...
April 24, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29683407/effect-of-er-cr-ysgg-laser-and-ascorbic-acid-on-the-bond-strength-and-microleakage-of-bleached-enamel-surface
#13
Fahad Alkhudhairy, Abdulaziz AlKheraif, Mohammed Bin-Shuwaish, Sulieman Al-Johany, Mustafa Naseem, Fahim Vohra
BACKGROUND: The available evidence of Er,Cr:YSGG lasers on bleached enamel is limited and controversial. It is assumed that Er,Cr:YSGG laser will be effective in reversing the effect of bleaching on adhesive bond integrity of enamel to resin composite. OBJECTIVE: The study aimed to evaluate the efficacy of Er,Cr:YSGG laser on bond strength and microleakage of bleached enamel. MATERIALS AND METHODS: From the 80 samples, 60 samples were bleached (40% hydrogen peroxide) and divided into three subgroups...
April 23, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29683318/ray-dutt-and-bailar-twists-in-fe-ii-tris-2-2-bipyridine-spin-states-sterics-and-fe-n-bond-strengths
#14
Daniel C Ashley, Elena Jakubikova
Twisting motions in six-coordinate trischelate transition-metal complexes have long been recognized as a potential reaction coordinate for nondissociative racemization by changing the coordination geometry from octahedral to trigonal prismatic in the transition state. These pathways have been previously established as the Bailar twist (conversion to D3 h symmetry) and the Ray-Dutt twist (conversion to C2 v symmetry). Twisting motions have been shown to be associated with changes in spin state and are therefore of relevance not only to thermal isomerization pathways but also to spin-crossover (SCO) and intersystem crossing mechanisms...
April 23, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29682833/fracture-resistance-of-pressed-and-milled-lithium-disilicate-anterior-complete-coverage-restorations-following-endodontic-access-preparation
#15
Petrina Gerogianni, Wen Lien, Despoina Bompolaki, Ronald Verrett, Stephan Haney, Patrick Mattie, Russell Johnson
PURPOSE: This in vitro study evaluated the fracture resistance and clinical prognosis of anterior lithium disilicate crowns (e.max Press and e.max CAD), following endodontic access and repair. The research design simulates intraoral loading conditions to produce clinically applicable results. MATERIALS AND METHODS: Monolithic anterior crowns, based on #8 anatomy, were fabricated from e.max Press ingots and e.max CAD blocks and adhesively bonded on identical dies milled out of a dentin analog material (NEMA G10)...
April 22, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29682570/influence-of-polishing-methods-on-the-bonding-effectiveness-and-durability-of-different-resin-cements-to-dentin
#16
Lingyan Ren, Mingfei Li, Yahui Pan, Xiangfeng Meng
The purpose of this study was to investigate the impact of polishing methods on the bonding effectiveness and durability of different resin cements to dentin. The dentin surfaces were either treated with a fine-grit diamond bur (polishing A) or further polished by polishing disks (polishing B), and then they were bonded with any one of the three resin cements, namely, etch-and-rinse, self-etch, and self-adhesive resin cements. After 24-hour or 2-year water storage, a microtensile bond strength ( μ TBS) test was performed...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29682261/cement-layer-thickness-and-shear-stress-resistance-in-cylindrical-dowel-spaces-pull-out-test
#17
M Andreasi Bassi, D Lauritano, M Brizzi, C Andrisani, S Lico, V Candotto
Purpose: This study evaluated the effects of different dowel space (DS) diameters on pull-out bond strength of a cylindrical post, of threaded steel, to dentin. Materials and methods: Forty-five extracted human teeth were divided in 3 groups with DSs, with the same depth (6 mm), differing for the diameter (i.e. 1.5 mm, Group 1; 1.75 mm, Group 2; 2.00 mm, Group 3). Both the diameter of the post (1.3 mm) and the composite resin cement (Panavia 21) were the same for all the samples...
October 2017: Oral & Implantology
https://www.readbyqxmd.com/read/29680613/microstructural-evolution-of-sic-joints-soldered-using-zn-al-filler-metals-with-the-assistance-of-ultrasound
#18
Bingzhi Wu, Xuesong Leng, Ziyang Xiu, Jiuchun Yan
SiC ceramics were successfully soldered with the assistance of ultrasound. Two kinds of filler metals, namely non-eutectic Zn-5Al-3Cu and eutectic Zn-5Al alloys, were used. The effects of ultrasonic action on the microstructure and mechanical properties of the soldered joints were investigated. The results showed that ultrasound could promote the wetting and bonding between the SiC ceramic and filler metals within tens of seconds. For the Zn-5Al-3Cu solder, a fully grain-refined structure in the bond layer was obtained as the ultrasonic action time increased...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29680592/a-new-methodology-to-prepare-ceramic-organic-composite-coatings-with-good-cavitation-erosion-resistance
#19
Wen Deng, Guoliang Hou, Shuangjian Li, Jiesheng Han, Xiaoqin Zhao, Xia Liu, Yulong An, Huidi Zhou, Jianmin Chen
A simple, scalable and economical method was proposed to obtain ceramic-organic composite coating with excellent comprehensive properties include hardness, toughness, elastic recovery, lamellar interfacial bonding and anti-cavitation erosion: introducing epoxy resin into the pores and micro-cracks of plasma sprayed ceramic coating. The results indicate that the epoxy resin was successfully penetrated into the whole ceramic coating and filled almost all defects by vacuum impregnation, which greatly enhanced its compactness and mechanical properties...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29679977/ab-initio-characterization-of-coupling-strength-for-all-types-of-dangling-bond-pairs-on-the-hydrogen-terminated-si-100-2-%C3%A3-1-surface
#20
Zahra Shaterzadeh-Yazdi, Barry C Sanders, Gino A DiLabio
Recent work has suggested that coupled silicon dangling bonds sharing an excess electron may serve as building blocks for quantum-cellular-automata cells and quantum computing schemes when constructed on hydrogen-terminated silicon surfaces. In this work, we employ ab initio density-functional theory to examine the details associated with the coupling between two dangling bonds sharing one excess electron and arranged in various configurations on models of phosphorous-doped hydrogen-terminated silicon (100) surfaces...
April 21, 2018: Journal of Chemical Physics
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