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https://www.readbyqxmd.com/read/28224909/hybrid-monolith-sorbent-of-polypyrrole-coated-graphene-oxide-incorporated-into-a-polyvinyl-alcohol-cryogel-for-extraction-and-enrichment-of-sulfonamides-from-water-samples
#1
Kochaporn Chullasat, Piyaluk Nurerk, Proespichaya Kanatharana, Pamornrat Kueseng, Thanyaporn Sukchuay, Opas Bunkoed
A hybrid monolith sorbent of polypyrrole-coated graphene oxide embedded in polyvinyl alcohol cryogel was prepared and used as an effective solid phase extraction sorbent for the determination of trace sulfonamides. The large surface areas with many adsorption sites of polypyrrole and graphene oxide facilitated the high adsorption of sulfonamides via hydrogen bonding, π-π and hydrophobic interactions. The high porosity of the polyvinyl alcohol cryogel helped to reduce the back pressure that occurs in a conventional packed solid phase extraction cartridge...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28223198/novel-bioactive-root-canal-sealer-to-inhibit-endodontic-multispecies-biofilms-with-remineralizing-calcium-phosphate-ions
#2
Lin Wang, Xianju Xie, Chunyan Li, Huaibing Liu, Ke Zhang, Yanmin Zhou, Xiaofeng Chang, Hockin H K Xu
OBJECTIVE: The objectives of this study were to: (1) develop a bioactive endodontic sealer via dimethylaminohexadecyl methacrylate (DMAHDM), 2-methacryloyloxyethyl phosphorylcholine (MPC) and nanoparticles of amorphous calcium phosphate (NACP) for the first time; and (2) evaluate inhibition of early-stage and mature multispecies endodontic biofilm, bond strength to root canal dentin, and calcium (Ca) and phosphate (P) ion release. METHODS: A series of bioactive endodontic sealers were formulated with DMAHDM, MPC, and NACP...
February 18, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28222907/fatigue-testing-of-biomaterials-and-their-interfaces
#3
Dwayne Arola
OBJECTIVE: The objective of this article is to describe the importance of fatigue to the success of restorative dentistry, with emphasis on the methods for evaluating the fatigue properties of materials in this field, and the durability of their bonded interfaces. METHODS: The stress-life fatigue and fatigue crack growth approaches for evaluating the fatigue resistance of dental biomaterials are introduced. Emphasis is placed on in vitro studies of the hard tissue foundation, restorative materials and their bonded interfaces...
February 17, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28222875/comparison-of-push-out-bond-strength-of-fiber-reinforced-composite-resin-posts-according-to-cement-thickness
#4
Jun-Seong Park, Jeong-Sub Lee, Jeong-Won Park, Won-Gyun Chung, Eun-Hee Choi, Yoon Lee
STATEMENT OF PROBLEM: Post space size and cement thickness can differ because of variations in root canal morphology, such as an oval shape, and because the entire canal space cannot be included in the post space preparation. As a result, increased cement thickness around the post may affect the bond strength between the post and the dentin. PURPOSE: The purpose of this in vitro study was to evaluate the push-out bond strength of fiber-reinforced composite resin posts to root dentin with cement layers of varying thickness...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222866/shear-bond-strength-of-zirconia-based-ceramics-veneered-with-2-different-techniques
#5
Ahmed M Zaher, J L Hochstedler, Frederick A Rueggeberg, Edwin L Kee
STATEMENT OF PROBLEM: Delamination of veneering ceramic is reported as one of the most frequent problems associated with veneered zirconia restorations. PURPOSE: The purpose of this in vitro study was to compare the shear bond strength of sintered lithium disilicate to that of pressed fluorapatite glass-ceramic on a zirconia substrate. MATERIAL AND METHODS: Thirty zirconia blocks (20×15×2.5-mm thick) were cut, sintered, and divided into 2 groups...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28220332/increased-mercury-emissions-from-modern-dental-amalgams
#6
Ulf G Bengtsson, Lars D Hylander
All types of dental amalgams contain mercury, which partly is emitted as mercury vapor. All types of dental amalgams corrode after being placed in the oral cavity. Modern high copper amalgams exhibit two new traits of increased instability. Firstly, when subjected to wear/polishing, droplets rich in mercury are formed on the surface, showing that mercury is not being strongly bonded to the base or alloy metals. Secondly, high copper amalgams emit substantially larger amounts of mercury vapor than the low copper amalgams used before the 1970s...
February 20, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28218478/exceptionally-high-ionic-conductivity-in-na3-p0-62-as0-38-s4-with-improved-moisture-stability-for-solid-state-sodium-ion-batteries
#7
Zhaoxin Yu, Shun-Li Shang, Joo-Hwan Seo, Daiwei Wang, Xiangyi Luo, Qingquan Huang, Shuru Chen, Jun Lu, Xiaolin Li, Zi-Kui Liu, Donghai Wang
A Na-ion solid-state electrolyte, Na3 P0.62 As0.38 S4 , is developed with an exceptionally high conductivity of 1.46 mS cm(-1) at 25 °C and enhanced moisture stability. Dual effects of alloying element As (lattice expansion and a weaker AsS bond strength) are responsible for the superior conductivity. Improved moisture stability is regulated by shifting low energy moisture reactions to high energy ones due to As.
February 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28217790/nanotribological-properties-of-nanostructured-poly-cysteine-methacrylate-brushes
#8
Omed Al-Jaf, Abdullah Alswieleh, Steven P Armes, Graham J Leggett
The nanomechanical properties of zwitterionic poly(cysteine methacrylate) (PCysMA) brushes grown from planar surfaces by atom transfer radical polymerisation have been characterised by friction force microscopy (FFM). FFM provides quantitative insights into polymer structure-property relationships and in particular illuminates the dependence of brush swelling on chain packing in nanostructured materials. In ethanol, which is a poor solvent for PCysMA, a linear friction-load relationship is observed, indicating that energy dissipation occurs primarily through ploughing...
February 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28216664/iron-isotopic-fractionation-between-silicate-mantle-and-metallic-core-at-high-pressure
#9
Jin Liu, Nicolas Dauphas, Mathieu Roskosz, Michael Y Hu, Hong Yang, Wenli Bi, Jiyong Zhao, Esen E Alp, Justin Y Hu, Jung-Fu Lin
The +0.1‰ elevated (56)Fe/(54)Fe ratio of terrestrial basalts relative to chondrites was proposed to be a fingerprint of core-mantle segregation. However, the extent of iron isotopic fractionation between molten metal and silicate under high pressure-temperature conditions is poorly known. Here we show that iron forms chemical bonds of similar strengths in basaltic glasses and iron-rich alloys, even at high pressure. From the measured mean force constants of iron bonds, we calculate an equilibrium iron isotope fractionation between silicate and iron under core formation conditions in Earth of ∼0-0...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28216270/are-premixed-calcium-silicate-based-endodontic-sealers-comparable-to-conventional-materials-a-systematic-review-of-in%C3%A2-vitro-studies
#10
REVIEW
Luiza Helena Silva Almeida, Rafael Ratto Moraes, Renata Dornelles Morgental, Fernanda Geraldo Pappen
INTRODUCTION: This study aimed to compare the physicochemical and biological properties of premixed calcium silicate-based endodontic sealers with other conventional root canal filling materials by systematically reviewing laboratory studies. METHODS: The search was conducted in 3 databases (Medline via PubMed, Scopus, and Web of Science) following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. Two reviewers independently selected the studies and extracted the data...
February 16, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28213709/high-efficiency-removal-of-triclosan-by-structure-directing-agent-modified-mesoporous-mil-53-al
#11
Rongni Dou, Junya Zhang, Yuancai Chen, Siyuan Feng
In order to expand the potential applications of metal-organic frameworks (MOFs), structure directing agents modified mesoporous MIL-53(Al) (MIL-53(Al)-1) was investigated to adsorb triclosan (TCS) with two different initial concentrations. MIL-53(Al)-1 with high mesoporosity and total pore volume exhibited higher adsorption capacity and 4.4 times faster adsorption of TCS at low concentration (1 mg L(-1)) than that of microporous MIL-53(Al). Also, mesoporous as well as microporous MIL-53(Al) showed significant higher adsorption capacity and two orders of magnitude greater fast uptake of TCS than two kinds of mesoporous-activated carbon...
February 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28210434/effect-of-the-tio2-nanoparticles-on-the-selected-physical-properties-of-mineral-trioxide-aggregate
#12
Mohammad Samiei, Maryam Janani, Naser Asl-Aminabadi, Negin Ghasemi, Baharak Divband, Sajjad Shirazi, Kayvan Kafili
BACKGROUND: Some of the efforts to improve the properties of Mineral Trioxide Aggregate (MTA) include incorporation of some nanoparticles such as Titanium dioxide (TiO2). The aim of this study was to evaluate the effect of TiO2 nanoparticles on the setting time, working time, push-out bond strength and compressive strength of MTA. MATERIAL AND METHODS: The physical properties to be evaluated were determined using the ISO 6786:2001 and 9917 specifications. Fifteen samples of each material (MTA or MTA with 1% weight ratio of TiO2 Nanoparticles) were prepared for any evaluated physical property...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28210433/effect-of-adhesive-layers-on-microshear-bond-strength-of-nanocomposite-resin-to-dentin
#13
Nayef H Felemban, Mohamed I Ebrahim
BACKGROUND: Bond strength of adhesive layer can absorb unwanted stresses of polymerization shrinkage in composite resin restorations; increased microshear bond strength can prevent failure of restoration materials, the purpose of this study was to evaluate the effect of adhesive layers on microshear bond strength of nanocomposite resin to dentin. MATERIAL AND METHODS: Two different types of adhesive systems: universal adhesive (ExciTE) and newly developed adhesive (Nano-Bond), and one type of light-cured resin restorative material (Nanocomposite resin) were used in this study...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28208997/comparison-of-self-etch-primers-with-conventional-acid-etching-system-on-orthodontic-brackets
#14
Amit Zope, Yogita Zope-Khalekar, Shrikant S Chitko, Veerendra V Kerudi, Harshal Ashok Patil, Prasad Vasudeo Bonde, Pratik Jaltare, Siddhesh G Dolas
INTRODUCTION: The self-etching primer system consists of etchant and primer dispersed in a single unit. The etching and priming are merged as a single step leading to fewer stages in bonding procedure and reduction in the number of steps that also reduces the chance of introduction of error, resulting in saving time for the clinician. It also results in smaller extent of enamel decalcification. AIM: To compare the Shear Bond Strength (SBS) of orthodontic bracket bonded with Self-Etch Primers (SEP) and conventional acid etching system and to study the surface appearance of teeth after debonding; etching with conventional acid etch and self-etch priming, using stereomicroscope...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208080/enhanced-removal-of-bisphenol-af-by-activated-carbon-alginate-beads-with-cetyltrimethyl-ammonium-bromide
#15
Zheng Tang, Sha Peng, Shuya Hu, Song Hong
Adsorption removal of bisphenol-AF (BPAF) from aqueous solutions by synthesized activated carbon-alginate beads (AC-AB) with cetyltrimethyl ammonium bromide (CTAB) has been studied using two ways. The traditional method (two-step) first synthesized CTAB-modified AC-AB (AC-AB-CTAB), then used it to remove BPAF by adsorption. And one-step method dispersed AC-AB and CTAB in wastewater, followed by the removal of BPAF accompanied with the synthesis of AC-AB-CTAB. The one-step method showed a better performance than the two-step method, achieving a maximum removal of BPAF with 284...
January 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28206901/assessment-of-enamel-bond-strength-of-hypoplastic-primary-teeth
#16
Lisa Scheidt, Mariane Emi Sanabe, Fabrãcio Mezzomo Collares, Vicente Castelo Branco Leitune, Eduardo Bresciani, Michele Baffi Diniz
PURPOSE: The purpose of this study was to compare the enamel bond strength of hypoplastic and healthy primary teeth. METHODS: Twenty-five hypoplastic teeth (experimental group) and 25 healthy primary teeth (control group) were selected and conditioned with 35 percent orthophosphoric acid before a two-layer adhesive system (Single Bond) was applied. Composite resin (Filtek Z350) was inserted in a single application, two-mm high and one-mm in diameter, and then light-cured for 20 seconds...
October 15, 2016: Pediatric Dentistry
https://www.readbyqxmd.com/read/28203014/-influence-of-surface-treatment-with-sodium-hypochlorite-solution-on-dentin-bond-strength
#17
Y Wang, Y H Liang
OBJECTIVE: To evaluate the influence of sodium hypochlorite (NaOCl) solution used during root canal therapy on dentin bond strength. METHODS: In the study, 15 freshly extracted human third molars with complete dental crowns, caries and filling-free were selected. The occlusal enamel was removed perpendicular to the long axis of the tooth to expose middle flat surfaces of sound dentin. The occlusal dentin surfaces were then polished using 600-grit silicon papers for 1 min and rinsed with deionized water for 1 min...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28203013/-curing-mode-of-universal-adhesives-affects-the-bond-strength-of-resin-cements-to-dentin
#18
Z R Fu, F C Tian, L Zhang, B Han, X Y Wang
OBJECTIVE: To determine the effects of curing mode of one-step and two-step universal adhesives on the micro-tensile bond strength (μTBS) of different dual-cure resin cements to dentin. METHODS: One-step universal adhesive Single Bond Universal (SBU), and two-step universal adhesive OptiBond Versa (VSA) were chosen as the subjects, one-step self-etching adhesive OptiBond All in One (AIO) and two-step self-etching adhesive Clearfil SE Bond (SEB) were control groups, and two dual-cure resin cements RelyX Ultimate (RLX) and Nexus 3 Universal (NX3) were used in this study...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28203012/-effects-of-saliva-contamination-on-bond-strength-of-resin-resin-interfaces
#19
H J Guo, C Z Gao, F Lin, W Liu, L Yue
OBJECTIVE: To estimate the bond strength between different resin composite interfaces, and to evaluate the effect of saliva contamination and management with the contamination on the bond strength. METHODS: Two commercial resin composites containing different types of fillers (AP-X: barium-glass; P60: quartz) were tested in this study. The basic composite blocks were made of AP-X. After wet-ground flatted, the experimental groups were divided into three groups according to the surface treatment: (1)Direct bonding group: the bonding surface was rinsed with distilled water for 20 s, then dried with oil-free air for 20 s; (2)Saliva contamination group: the bonding surface was bathed in saliva for 30 min, then distilled water was rinsed for 20 s and dried with oil-free air for 20 s; (3)Saliva contamination and 75% ethanol wiping group: bonding surface bathed in saliva for 30 min, then wipe the surface with 75% ethanol, distilled water rinse for 20 s and dry with oil-free air for 20 s; The control group was made of the basic composite bulks of AP-X directly bonding with composite P60...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28202966/stable-colloids-in-molten-inorganic-salts
#20
Hao Zhang, Kinjal Dasbiswas, Nicholas B Ludwig, Gang Han, Byeongdu Lee, Suri Vaikuntanathan, Dmitri V Talapin
A colloidal solution is a homogeneous dispersion of particles or droplets of one phase (solute) in a second, typically liquid, phase (solvent). Colloids are ubiquitous in biological, chemical and technological processes, homogenizing highly dissimilar constituents. To stabilize a colloidal system against coalescence and aggregation, the surface of each solute particle is engineered to impose repulsive forces strong enough to overpower van der Waals attraction and keep the particles separated from each other...
February 15, 2017: Nature
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