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https://www.readbyqxmd.com/read/29033192/chemical-affinity-of-10-methacryloyloxydecyl-dihydrogen-phosphate-to-dental-zirconia-effects-of-molecular-structure-and-solvents
#1
Ying Chen, Zhicen Lu, Mengke Qian, Huaiqin Zhang, Chen Chen, Haifeng Xie, Franklin R Tay
OBJECTIVES: To examine whether solvents and changing the molecular structure of 10-Methacryloyloxydecyl dihydrogen phosphate (10-MDP) affect its chemical affinity to Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). METHODS: The present work investigated the chemical affinity between Y-TZP and 10-MDP dissolved in different solvents (acetone/ethanol/water or mixture) using X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and thermodynamic calculations...
October 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29032826/the-effect-of-internal-roughness-and-bonding-on-the-fracture-resistance-and-structural-reliability-of-lithium-disilicate-ceramic
#2
Paul de Kok, Gabriel K R Pereira, Sara Fraga, Niek de Jager, Andressa B Venturini, Cornelis J Kleverlaan
OBJECTIVE: To evaluate the effect of internal roughness and bonding on the load to failure and structural reliability (Weibull analysis) of a lithium disilicate-based glass ceramic under different testing scenarios. METHODS: IPS e.max CAD blocks (Ivoclar Vivadent AG) were shaped into cylinders (N=100), crystalized according to the manufacturer's instructions, and randomly assigned into two surface conditions: (1) polished surface (600-grit SiC polish papers), and (2) a roughened surface (air-abrasion with 50μm Al2O3)...
October 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29031995/comparison-of-deproteinization-agents-on-bonding-to-developmentally-hypomineralized-enamel
#3
Manikandan Ekambaram, Robert P Anthonappa, Sharaschandra R Govindool, Cynthia Ky Yiu
OBJECTIVE: To compare bonding of dental adhesive to hypomineralized enamel (HE) after pre-treatment with either 5% sodium hypochlorite (NaOCl) solution or papain-based papacarie gel. METHODS: Normal enamel (NE) and HE obtained from hypomineralized first permanent molars were acid-etched with 32% phosphoric acid and randomly allocated into no deproteinization, deproteinization using 5% NaOCl, or deproteinization usping papacarie gel groups. Subsequently, the specimens were bonded, packed with composite resins and subjected to micro-shear bond strength (MSBS) testing and the data analysed using 2-way ANOVA and Tukey tests...
October 11, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29031223/enhanced-antibacterial-activity-and-biocompatibility-of-zinc-incorporated-organic-inorganic-nanocomposite-coatings-via-electrophoretic-deposition
#4
Pin Huang, Kena Ma, Xinjie Cai, Dan Huang, Xu Yang, Jiabing Ran, Fushi Wang, Tao Jiang
Increased use of reconstruction procedures in orthopedics has improved the life of patients undergoing surgery. However, surgical site infection remains a major challenge. Efforts were made to fabricate antibacterial surfaces with good biocompatibility. This present study aimed to fabricate zinc-incorporated chitosan/gelatin (CS/G) nanocomposite coatings on the titanium substrates via electrophoretic deposition (EPD). Physicochemical characterization confirmed that zinc was successfully deposited in a metallic oxide/salt complex status...
October 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29028849/the-effect-of-resin-cement-type-and-thermomechanical-aging-on-the-retentive-strength-of-custom-zirconia-abutments-bonded-to-titanium-inserts
#5
Merve Bankoğlu Gu Ngör
PURPOSE: The purpose of this study was to investigate the effect of resin cement type on the retentive strength of custom zirconia abutments bonded to titanium inserts. MATERIALS AND METHODS: Sixty implant (4.3 mm diameter and 11.5 mm length) and custom zirconia abutment (15 mm height and 2 mm wall thickness) pairs were used to form six groups (n = 10 each). Three different resin cements were used to bond the zirconia abutments and titanium inserts: Panavia F 2...
October 13, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29028596/synthesis-characterization-and-evaluation-of-a-fluorinated-resin-monomer-with-low-water-sorption
#6
Xue Liu, Zengyao Wang, Chengji Zhao, Wenhuan Bu, Yurong Zhang, Hui Na
A fluorinated acrylate monomer (4-TF-PQEA) without BPA (bisphenol-A) structure was synthesized and mixed with triethylene glycol dimethacrylate (TEGDMA) to used as dental resin system in order to achieve lower water sorption and reduce human exposure to BPA derivatives. Double bond conversion (DC) was measured using Fourier transform infrared spectroscopy (FTIR). Water sorption (WS), water solution (WL) and depth of cure (DOC) were evaluated according to ISO 4049:2009. Water contact angle (CA) was measured using contact angle analyzer...
September 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29028572/supramolecular-gels-using-an-amide-functionalized-imidazolium-based-surfactant
#7
Ni Cheng, Qi Kang, Jianhong Xiao, Na Du, Li Yu
Studies on supramolecular gel aggregates via supramolecular interactions are very fascinating and impressive. The interactions of gelator with solvent and inorganic salt can functionalize, activate, or control the properties of supramolecular gels. A lot of work on this area has been done, but all these contributions are only at an early stage. In this work, we tuned the gel formation conditions and properties by using low-molecular-weight gelator (LMWGs), amide-functionalized imidazolium-based surfactant, viz...
October 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29028507/hydrogen-bond-docking-preference-in-furans-oh%C3%A2-%C3%AF-vs-oh%C3%A2-o
#8
Xiaotong Jiang, Narcisse T Tsona, Shanshan Tang, Lin Du
The docking sites of hydrogen bonds in complexes formed between 2,2,2-trifluoroethanol (TFE), furan (Fu), and 2-methyl furan (MF) have been investigated. Using density functional theory (DFT) calculations, gas phase and matrix isolation FTIR spectroscopies, the strengths of OH⋯O and OH⋯π hydrogen bonds in the complexes were compared to find the docking preference. Calculations suggest that the hydrogen bond donor, TFE, is more likely to dock onto the oxygen atom of the aromatic furans ring, and consequently, the OH⋯O type hydrogen bond is relatively stronger than the OH⋯π type...
October 2, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29028491/boron-removal-from-hydraulic-fracturing-wastewater-by-aluminum-and-iron-coagulation-mechanisms-and-limitations
#9
Darpan Chorghe, Mutiara Ayu Sari, Shankararaman Chellam
One promising water management strategy during hydraulic fracturing is treatment and reuse of flowback/produced water. In particular, the saline flowback water contains many of the chemicals employed for fracking, which need to be removed before possible reuse as "frac water." This manuscript targets turbidity along with one of the additives; borate-based cross-linkers used to adjust the rheological characteristics of the frac-fluid. Alum and ferric chloride were evaluated as coagulants for clarification and boron removal from saline flowback water obtained from a well in the Eagle Ford shale...
September 28, 2017: Water Research
https://www.readbyqxmd.com/read/29028438/laser-sintering-technology-and-balling-phenomenon
#10
Perihan Oyar
OBJECTIVE: The aim of this review was to evaluate the balling phenomenon which occurs typically in Selective Laser Sintering (SLS). BACKGROUND DATA: The balling phenomenon is a typical SLS defect, and observed in laser sintered powder, significantly reduces the quality of SLS, and hinders the further development of SLS Technology. METHODS: Electronic database searches were performed using Google Scholar. The keywords "laser sintering, selective laser sintering, direct metal laser melting, and balling phenomenon" were searched in title/abstract of publications, limited to December 31, 2016...
October 13, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29027949/the-flexural-strength-and-fracture-toughness-of-tc4-based-laminated-composites-reinforced-with-ti-aluminide-and-carbide
#11
Yanhan Fei, Taotao Ai, Qunfei Niu, Wenhu Li, Xinqiang Yuan, Ran Jing, Hongfeng Dong
TiC-Ti-Al mixed powders and TC4 titanium alloy foils were overlapped layer-by-layer in the graphite die. The TC4-based laminated composite sheets reinforced by Ti aluminide and carbide were successfully fabricated via spark plasma sintering (SPS) at 1100 °C with a well-bonded interface. The composite layers were mainly composed of TiAl, Ti₃Al, Ti₂AlC, and Ti₃AlC₂ phases. The carbides particles distributed in the matrix played an important role in the deflection of cracks and the passivation of microcracks...
October 13, 2017: Materials
https://www.readbyqxmd.com/read/29025637/electrospun-biphasic-tubular-scaffold-with-enhanced-mechanical-properties-for-vascular-tissue-engineering
#12
Abdalla Abdal-Hay, Michal Bartnikowski, Stephen Hamlet, Sašo Ivanovski
Polymer scaffolds produced through an electrospinning process are frequently explored as tissue substitutes for regenerative medicine. Despite offering desirable surface area to volume ratios and tailorable pore sizes, their poor structural mechanical properties limit their applicability in load-bearing regions. In this study, we present a simple strategy to improve the mechanical properties of a vascular graft scaffold. We achieved the formation of biphasic tubular scaffolds by electrospinning polyurethane (PU) onto an airbrushed tube made of polycaprolactone (PCL)...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29024714/antibacterial-effect-and-bond-strength-of-a-modified-dental-adhesive-containing-the-peptide-nisin
#13
Meixuan Su, Shunyi Yao, Lisha Gu, Zihua Huang, Sui Mai
This study attempted to incorporate the antibacterial peptide nisin into an etch-and-rinse dental adhesive to evaluate the antibacterial activity of the modified adhesive against Streptococcus mutans and the bond strength. Single Bond 2 was used as a negative control, and nisin was incorporated at 1%, 3%, and 5% (w/v). The antibacterial activity against S. mutans was evaluated using the film contact test, the agar diffusion test, XTT assays and confocal laser scanning microscopy (CLSM). The microtensile bond strength (μTBS) of the modified dental adhesive was also evaluated...
October 9, 2017: Peptides
https://www.readbyqxmd.com/read/29024100/an-all-integrated-anode-via-interlinked-chemical-bonding-between-double-shelled-yolk-structured-silicon-and-binder-for-lithium-ion-batteries
#14
Yajie Liu, Zhixin Tai, Tengfei Zhou, Vitor Sencadas, Jian Zhang, Lei Zhang, Konstantin Konstantinov, Zaiping Guo, Hua Kun Liu
The concept of an all-integrated design with multifunctionalization is widely employed in optoelectronic devices, sensors, resonator systems, and microfluidic devices, resulting in benefits for many ongoing research projects. Here, maintaining structural/electrode stability against large volume change by means of an all-integrated design is realized for silicon anodes. An all-integrated silicon anode is achieved via multicomponent interlinking among carbon@void@silica@silicon (CVSS) nanospheres and cross-linked carboxymethyl cellulose and citric acid polymer binder (c-CMC-CA)...
October 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29023844/information-on-gas-phase-diatomic-molecules-from-magnetically-induced-current-densities
#15
Luis Alvarez-Thon, Liliana Mammino
Magnetically induced current densities are different for different types of chemical bonds, and may help highlight some of their characteristics and stress their main differences. The present work considers magnetically induced current densities in the bonds of diatomic molecules bonded by covalent bonds as well as the gas phase molecules of 1:1 ionic compounds, comparing the current strength values and visualizing current density maps. The results show clear-cut differences for the different types of bonds (non-polar covalent, polar covalent, and ionic), and can also be related to the extent of the covalent or ionic character of a bond...
October 12, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/29023621/bond-strength-of-self-adhering-materials-effect-of-dentin-desensitizing-treatment-with-a-cpp-acp-paste
#16
Fereshteh Shafiei, Reza Derafshi, Mahtab Memarpour
This study investigated the effect of dentin-desensitizing treatment with a casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) paste on shear bond strength (SBS) of two types of self-adhering (SA) restorative materials: resin-modified glass-ionomer (Fuji II LC, GC) and self-adhering flowable composite resin (Vertise Flow, Kerr). Flat and smear layer-free dentin surfaces from 48 extracted molars were prepared and divided into four groups (n = 12 per group) according to Fuji II LC or Vertise Flow and CPP-ACP pretreatment or not...
November 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29023145/mechanical-properties-and-drug-release-of-venlafaxine-hcl-solid-mini-matrices-prepared-by-hot-melt-extrusion-and-hot-or-ambient-compression
#17
Theodoros Avgerinos, Nikolaos Kantiranis, Athanasia Panagopoulou, Stavros Malamataris, Kyriakos Kachrimanis, Ioannis Nikolakakis
Objective/Significance: To elucidate the role of plasticizers in different mini matrices and correlate mechanical properties with drug release. METHODS: Cylindrical pellets were prepared by hot-melt extrusion (HME) and mini tablets by hot (HC) and ambient compression (AC). Venlafaxine HCl was the model drug, Eudragit® RSPO the matrix former and citric acid or Lutrol® F127 the plasticizers. The matrices were characterised for morphology, crystallinity and mechanical properties. The influence of plasticizer's type and content on the extrusion pressure (Pe) during HME and ejection during tableting was examined and the mechanical properties were correlated with drug release parameters...
October 12, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29023117/molecular-engineering-of-nir-absorbing-thienopyrazine-double-donor-double-acceptor-organic-dyes-for-dscs
#18
Hammad Cheema, Adithya Peddapuram, Rebecca E Adams, Louis E McNamara, Leigh Anna Hunt, Ngoc Le, Davita L Watkins, Nathan I Hammer, Russell H Schmehl, Jared H Delcamp
The thienopyrazine (TPz) building block allows for NIR photon absorption in dye-sensitized solar cells (DSCs) when used as a π-bridge. We have synthesized and characterized 7 organic sensitizers employing thienopyrazine (TPz) as a π-bridge in a double donor, double acceptor (DD-π-AA) organic dye design. Donor groups are varied based on electron donating strength and sterics at the donor-π bridge bond with the acceptor groups varied as either carboxylic acids or benzoic acids on the π-bridge. This dye design was found to be remarkably tunable with solution absorption onsets ranging from 750 nm to near 1000 nm...
October 12, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29022137/effect-of-different-endodontic-sealers-and-time-of-cementation-on-push-out-bond-strength-of-fiber-posts
#19
Danielle Araújo Vilas-Boas, Renata Grazziotin-Soares, Diego Machado Ardenghi, José Bauer, Patrícia Oliveira de Souza, George Táccio de Miranda Candeiro, Etevaldo Matos Maia-Filho, Ceci Nunes Carvalho
OBJECTIVES: This study aims to evaluate the effect of different endodontic sealers (epoxy resin, eugenol, and bioceramic/calcium silicate-based) and the time of cementation (immediately or 7 days after canal obturation) on the bond strength of a fiberglass post cemented with RelyX™ ARC. MATERIAL AND METHODS: Eighty-four premolars were instrumented and divided into groups (n = 12) according to the sealer and the time of post cementation: Endofill (EN), Endosequence BC Sealer (BC), and AH Plus (AH) had immediately fiber post cementation; EN7, BC7, and AH7 had post cementation after 7 days; and control group (C) had fiber post cementation without endodontic sealer...
October 11, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29019393/tough-stretchable-compressive-novel-polymer-graphene-oxide-nanocomposite-hydrogels-with-excellent-self-healing-performance
#20
Chenguang Pan, Libin Liu, Qiang Chen, Qiang Zhang, Gailan Guo
Designing hydrogels with high mechanical properties without sacrificing their self-healing efficiencies remains great challenges. We have fabricated cationic polyacrylamide/graphene oxide (GO) hydrogels by free-radical polymerization of acrylamide (AM) and 2-(dimethylamino)ethylacrylatemethochloride (DAC) in the presence of GO. The mechanical properties and self-healing ability can be tuned by GO content and mass ratio of AM and DAC. The ionic bonds between DAC and GO and hydrogen bonds between AM and GO can efficiently dissipate energy and rebuild the networks...
October 11, 2017: ACS Applied Materials & Interfaces
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