keyword
MENU ▼
Read by QxMD icon Read
search

bond strength

keyword
https://www.readbyqxmd.com/read/28821138/biocompatible-chitin-carbon-nanotubes-composite-hydrogels-as-neuronal-growth-substrates
#1
Shuangquan Wu, Bo Duan, Ang Lu, Yanfeng Wang, Qifa Ye, Lina Zhang
In the past decades, extensive studies have demonstrated that carbon nanotubes (CNTs) could promote cell adhesion, proliferation and differentiation of neuronal cells. However, the potential cytotoxicity in biological systems severely restricted the utilization of CNTs as substrates for neural growth. In this study, biocompatible chitin/carbon nanotubes (Ch/CNT) composite hydrogels were developed via blending modified CNTs with chitin solution in 11wt% NaOH/4wt% urea aqueous system, and subsequently regenerating in ethanol...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821134/graphene-cyclodextrin-based-nanocomposite-hydrogel-with-enhanced-strength-and-thermo-responsive-ability
#2
Pang Zhu, Yonghong Deng, Chaoyang Wang
Dual crosslinked system has been proved to be an efficient method to obtain tough and high strength hydrogels. Herein, we synthesized a novel graphene oxide/p(acrylamide-co-poly(ethylene glycol) methyl ether methacrylate)/α-cyclodextrin (GO/P(AM-co-PEGMA)/CD) physical dual crosslinked hydrogel via copolymerization of AM and PEGMA in the α-CD/GO solution. The polymer main chains adsorb onto the GO surface resulting in the first crosslinked system and multiple hydrogen bonds between α-CDs that thread on the PEGMA side chains establish the second crosslinked system...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821066/mechanical-properties-improvement-of-chitosan-films-via-the-use-of-plasticizer-charge-modifying-agent-and-film-solution-homogenization
#3
Sarinya Prateepchanachai, Wasina Thakhiew, Sakamon Devahastin, Somchart Soponronnarit
Glycerol, charge modifying agent (NaCl) and high-pressure homogenization were used to prepare chitosan film-forming solution prior to drying to improve mechanical properties of the resulting films. Zeta potential and viscosity of each film solution were measured, while mechanical properties viz. tensile strength and percent elongation of the films were assessed. X-ray diffraction analysis, Fourier transform infrared spectroscopy and dynamic mechanical analysis results of the films were obtained and used to explain the mechanical property data...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820250/coordination-and-thermodynamics-of-trivalent-curium-with-malonate-at-increased-temperatures-a-spectroscopic-and-quantum-chemical-study
#4
Andrej Skerencak-Frech, Michael Trumm, Daniel R Fröhlich, Petra J Panak
The complexation of Cm(III) with malonate is studied by time-resolved laser fluorescence spectroscopy (TRLFS) in the temperature range from 25 to 90 °C. Three complexes ([Cm(Mal)n](3-2n), n = 1, 2, 3) are identified and their molar fractions are determined as a function of the ligand concentration, the ionic strength, and the temperature. A general shift of the chemical equilibrium toward higher complexes with increasing temperature is observed, with the [CmMal3](3-) complex forming only at T > 40 °C. The conditional stability constants (log K'n(T)) are calculated and extrapolated to Im = 0 with the specific ion interaction theory (SIT)...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28817736/performance-of-class-i-composite-restorations-when-polished-immediately-or-after-one-day-water-storage
#5
Masao Irie, Yukinori Maruo, Goro Nishigawa
This study investigated the effects on gap formation in Class I restorations (observed by vertical and horizontal forms of inspection) and on the mechanical properties of nine resin composite filling materials when the restorations were subject to finishing immediately after setting or after one-day water storage. Class I restorations with resin composite fillings were polished either immediately (3 min) after setting or after one-day water storage. Interfacial gap formation (observed by vertical inspection) was assessed using 14 gap measurement points along the interface between the restoration and cavity walls and floor (n = 10 per resin composite; total points measured per time point = 140)...
2017: PloS One
https://www.readbyqxmd.com/read/28816187/comparison-of-film-thickness-of-two-commercial-brands-of-glass-lonomer-cement-and-one-dual-cured-composite-an-in-vitro-study
#6
Rajat R Khajuria, Rishav Singh, Pranamee Barua, Nausheen Hajira, Naveen Gupta, Rohit R Thakkar
AIM: The present study is undertaken to examine the film thickness of three most commonly used luting cements and to determine their usage as a luting agent. MATERIALS AND METHODS: This study was carried out strictly according to the guidelines of American Dental Association (ADS) specification no. 8. Two glass slabs of 5 cm in length and 2 cm in width were used. One glass slab was kept over the other glass slab and the space between the two glass slabs was measured using metallurgical microscope at the power of 10*...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815816/coordination-behavior-of-planar-chiral-cyclic-amino-ferrocenyl-carbene-in-iridium-complexes
#7
Yuta Shikata, Risa Yasue, Kazuhiro Yoshida
Iridium complexes bearing a new type of chiral carbene ligand, cyclic (amino)(ferrocenyl)carbene (CAFeC), were prepared. The complexes, which are quite stable in air and moisture, were fully characterized by NMR spectroscopy and X-ray diffraction analysis. The NMR spectra of the dicarbonyl complex [IrCl(CO)2(CAFeC)] showed signals for two isomers in solution, which were assigned to diastereomeric rotamers arising from the rotation of the chiral CAFeC ligand around the axes of the Ir-Ccarbene bond. IR spectroscopy of the dicarbonyl complex revealed that the donor strength of CAFeC is much higher than those of classic N-heterocyclic carbenes (NHCs) and comparable to those of cyclic amino alkyl carbenes (CAACs)...
August 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28815249/-effect-of-hemostatic-agent-on-bonding-strength-of-deciduous-tooth-dentin
#8
Qiu-Hua Pan, Da-Wei Huang, Qing-Tai Wang
PUPPOSE: To investigate the effect of hemostatic agent on bonding strength of deciduous tooth dentin. METHODS: Forty deciduous molars were used to make dentin grinding model and randomly divided into observation group and control group, 20 teeth in each group. Teeth in the observation group were covered with hemostatic agent for 30s, and then washed, followed by processing; while teeth in the control group were subjected to bonding directly. Micro tensile bond strength and micro leakage were measured and compared in the two groups...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28814364/effect-of-cured-versus-uncured-adhesive-inclusion-on-the-microtensile-bond-strength-of-sealants
#9
Austin McMurphy, Xiaoming Xu, Suzanne Fournier, Zafer C Cehreli, Kramer Sherman, Courtney Tremmel, Qingzhao Yu, Janice Townsend
PURPOSE: To determine the impact of light curing of bonding agents on the microtensile bond strength (MTBS) of sealants on extracted teeth. METHODS: Flat enamel surfaces were created on 54 extracted, sound human molars by sequential grinding. Three different sealants- Clinpro (3M ESPE), Ultraseal XT Hydro (Ultradent), and Fluorshield VLC (Dentsply)- were placed after acid etching without a bonding agent (control) or with three different bonding agents - Adper Single Bond Plus (3M ESPE), Peak Universal Bond (Ultradent), and Prime&Bond Elect (Dentsply)- each in both light-cured and uncured form...
May 15, 2017: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/28813043/folic-acid-supramolecular-ionogels
#10
Rahul Ranjan, Kamla Rawat, H B Bohidar
Herein, we report on folic acid (FA, a low molecular weight gelator) thermoreversible supramolecular organo (in 1 : 1 (v/v) water-DMSO binary solvent), and ionogels made in 1-ethyl-3-methyl imidazolium chloride, [C2mim][Cl], and 1-octyl-3-methyl imidazolium chloride, [C8mim][Cl], solutions with 0.1 ≤ [IL] ≤ 5% (w/v). The self-assembled fibrils of folic acid were largely formed due to secondary forces, such as π-π stacking, H-bonding, and hydrophobic interactions above a gelator concentration of 0...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28812194/amorphous-silica-promoted-lysine-dimerization-a-thermodynamic-prediction
#11
Norio Kitadai, Kumiko Nishiuchi, Akari Nishii, Keisuke Fukushi
It has long been suggested that mineral surfaces played a crucial role in the abiotic polymerization of amino acids that preceded the origin of life. Nevertheless, it remains unclear where the prebiotic process took place on the primitive Earth, because the amino acid-mineral interaction and its dependence on environmental conditions have yet to be understood adequately. Here we examined experimentally the adsorption of L-lysine (Lys) and its dimer (LysLys) on amorphous silica over a wide range of pH, ionic strength, adsorbate concentration, and the solid/water ratio, and determined the reaction stoichiometries and the equilibrium constants based on the extended triple-layer model (ETLM)...
August 15, 2017: Origins of Life and Evolution of the Biosphere
https://www.readbyqxmd.com/read/28812169/bond-strength-of-etch-and-rinse-and-self-etch-adhesive-systems-to-enamel-and-dentin-irradiated-with-a-novel-co2-9-3%C3%A2-%C3%AE-m-short-pulsed-laser-for-dental-restorative-procedures
#12
Peter Rechmann, N Bartolome, R Kinsel, R Vaderhobli, B M T Rechmann
The objective of this study was to evaluate the influence of CO2 9.3 μm short-pulsed laser irradiation on the shear bond strength of composite resin to enamel and dentin. Two hundred enamel and 210 dentin samples were irradiated with a 9.3 µm carbon dioxide laser (Solea, Convergent Dental, Inc., Natick, MA) with energies which either enhanced caries resistance or were effective for ablation. OptiBond Solo Plus [OptiBondTE] (Kerr Corporation, Orange, CA) and Peak Universal Bond light-cured adhesive [PeakTE] (Ultradent Products, South Jordan, UT) were used...
August 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28811592/high-performance-therapeutic-quercetin-doped-adhesive-for-adhesive-dentin-interfaces
#13
Hongye Yang, Kang Li, Huiyi Yan, Siying Liu, Yake Wang, Cui Huang
Almost half of dental restorations have failed in less than 10 years, and approximately 60% of practice time has been consumed to replace these dental restorations. As such, contemporary dentin adhesives should be modified to treat secondary caries and prevent the degradation of adhesive-dentin interfaces. To achieve this goal, we developed a versatile therapeutic adhesive in the present study by incorporating quercetin, which is a naturally derived plant extract, into a commercial adhesive at three concentrations (100, 500 and 1000 µg/mL)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810729/thermal-stability-of-organic-monolayers-grafted-to-si-111-insights-from-reaxff-reactive-molecular-dynamics-simulations
#14
Federico A Soria, Weiwei Zhang, Adri C T van Duin, Eduardo Martin Patrito
We used the ReaxFF reactive molecular dynamics simulations to investigate the chemical mechanisms and kinetics of thermal decomposition processes of silicon surfaces grafted with different organic molecules via Si-C bonds at atomistic level. In this work, we considered the Si(111) surface grafted with n-alkyl (ethyl, propyl, pentyl and decyl) layers in 50 % coverage and Si-CH3, Si-CCCH3 and Si-CHCHCH3 layers in full coverage. Si radicals primarily formed by the homolytic cleavage of Si-C bonds play a key role in the dehydrogenation processes that lead to the decomposition of the monolayers...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28808637/effects-of-air-abrasion-pressure-on-the-resin-bond-strength-to-zirconia-a-combined-cyclic-loading-and-thermocycling-aging-study
#15
Eman Z Al-Shehri, Afnan O Al-Zain, Alaa H Sabrah, Sarah S Al-Angari, Laila Al Dehailan, George J Eckert, Mutlu Özcan, Jeffrey A Platt, Marco C Bottino
OBJECTIVES: To determine the combined effect of fatigue cyclic loading and thermocycling (CLTC) on the shear bond strength (SBS) of a resin cement to zirconia surfaces that were previously air-abraded with aluminum oxide (Al2O3) particles at different pressures. MATERIALS AND METHODS: Seventy-two cuboid zirconia specimens were prepared and randomly assigned to 3 groups according to the air-abrasion pressures (1, 2, and 2.8 bar), and each group was further divided into 2 groups depending on aging parameters (n = 12)...
August 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28808635/effect-of-dentin-biomodifiers-on-the-immediate-and-long-term-bond-strengths-of-a-simplified-etch-and-rinse-adhesive-to-dentin
#16
Payal Singh, Rajni Nagpal, Udai Pratap Singh
OBJECTIVES: This in vitro study evaluated the effect of dentin biomodifiers on the immediate and long-term bond strengths of a simplified etch and rinse adhesive to dentin. MATERIALS AND METHODS: Flat coronal dentin surfaces were prepared in 120 extracted human molars. Teeth were randomly divided into 5 groups (n = 24) according to 5 different surface pre-treatments: No pre-treatment (control); 1M carbodiimide (EDC); 0.1% epigallocatechin-3-gallate (EGCG); 2% minocycline (MI); 10% sodium ascorbate (SA)...
August 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28808463/micro-push-out-bond-strength-and-bioactivity-analysis-of-a-bioceramic-root-canal-sealer
#17
Ceci Nunes Carvalho, Renata Grazziotin-Soares, George Táccio de Miranda Candeiro, Luis Gallego Martinez, Juliana Pereira de Souza, Patrícia Santos Oliveira, José Bauer, Giulio Gavini
INTRODUCTION: Bioactive endodontic sealers have been developed to improve the quality of root canal obturation. EndoSequence Bioceramic (BC) Sealer is amongst calcium silicate-based materials recently developed for permanent root canal filling. The objective of this study was to evaluate the bioactivity of BC Sealer and its micro push-out bond strength to dentin compared to AH-Plus (AH) sealer. METHODS AND MATERIALS: To perform the micro push-out test, 24 root canals of mandibular premolars were instrumented and divided into two groups (n=12)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808461/the-effect-of-calcium-chloride-on-push-out-bond-strength-of-calcium-enriched-mixture-cement-and-mineral-trioxide-aggregate
#18
Mohammad Mehdi Shokouhi, Abbas Abbaszadegan, Amin Ameri, Seyed Masih Sharifian, Mohammadreza Nabavizadeh
INTRODUCTION: This in vitro study investigated the effect of adding 10% calcium chloride (CaCl2) on push out bond strength of calcium-enriched mixture (CEM) cement and mineral trioxide aggregate (MTA) to root canal dentin. METHODS AND MATERIALS: A total of 120 root dentin slices with 2 mm thickness were prepared from sixty single-rooted human teeth. Dentinal discs were enlarged to achieve 1.3 mm diameter. The specimens were randomly allocated into eight groups (n=15)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808453/bond-strength-of-white-mineral-trioxide-aggregate-with-and-without-disodium-hydrogen-phosphate-with-different-liquid-to-powder-ratios
#19
Hadi Mokhtari, Sara Jafarizadeh, Hamid Reza Mokhtari Zonouzi, Mehrdad Lotfi, Mohammad Forough Reyhani, Aydin Sohrabi
INTRODUCTION: Mineral trioxide aggregate (MTA) can be used in the treatment of irritated vital pulp and repair of root perforations. However, the initial reaction of inflammatory cells to this material and also its setting time are not ideal. Studies have shown that disodium hydrogen phosphate (DHP), decreases the setting time of MTA, with no effect on its pH. This study was undertaken to evaluate the effect of DHP on push-out bond strength of MTA at different liquid-to-powder ratios...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28806426/comparative-evaluation-of-the-effect-of-laser-etching-on-the-shear-bond-strength-of-crowns-cemented-with-two-different-luting-agents-an-in-vitro-study
#20
Ankur Dahiya, Paresh Gandhi, Nadim Z Baba
PURPOSE: The aim of this study was to compare the shear bond strength of crowns cemented on natural teeth after surface treatment of the enamel with an erbium-doped yttrium aluminum garnet (Er:YAG) laser. MATERIALS AND METHODS: Crown preparation was done for 40 full-metal crowns, and wax patterns with loops were cast in a cobalt-chromium alloy. The Er:YAG laser was used for surface treatment of some teeth, and teeth without surface treatment acted as the control...
August 14, 2017: International Journal of Prosthodontics
keyword
keyword
108322
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"