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Silver fluoride

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https://www.readbyqxmd.com/read/28819096/controlled-radical-fluorination-of-poly-meth-acrylic-acids-in-aqueous-solution
#1
Yucheng Dong, Zhentao Wang, Chaozhong Li
Fluorinated alkenes exhibit very poor reactivity in copolymerization with non-fluorinated polar monomers such as acrylates. Herein we describe a convenient method for the synthesis of poly(vinyl fluoride-co-acrylic acid) and poly(2-fluoropropene-co-methacrylic acid) copolymers. Thus, the silver-catalyzed decarboxylative radical fluorination of poly(acrylic acid) with Selectfluor in water at room temperature affords poly(vinyl fluoride-co-acrylic acid) copolymers in high yields with well-defined molecular weights and polydispersities...
August 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28812312/a-systematic-review-of-silver-diamine-fluoride-effectiveness-and-application-in-older-adults
#2
REVIEW
Amruta D Hendre, George W Taylor, Elisa M Chávez, Susan Hyde
OBJECTIVE: This systematic review examines the effectiveness of silver diamine fluoride (SDF) in the management of caries in older adults. BACKGROUND: Silver diamine fluoride has been extensively researched and proven effective for caries prevention and arrest in children. Limited studies support its effectiveness in adult and older adult populations. MATERIALS AND METHODS: Multiple databases were searched according to specified inclusion-exclusion criteria...
August 15, 2017: Gerodontology
https://www.readbyqxmd.com/read/28798441/minimal-intervention-management-of-the-older-patient
#3
L J Walsh
With an aging population, dentists need to be aware of the risks which come to their elderly patients from retained teeth and exposed root surfaces. Oral health problems in the later years of life are multifactorial, with lifestyle, plaque and salivary factors remaining paramount. Root surface caries is likely to present a challenge in patients with a strong history of past coronal caries (and who have the attendant lifestyle risk factors) as well as in elderly patients who suddenly develop salivary hypofunction...
August 11, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28753269/highly-sensitive-flexible-pressure-sensor-based-on-silver-nanowires-embedded-polydimethylsiloxane-electrode-with-microarray-structure
#4
Xingtian Shuai, Pengli Zhu, Wenjin Zeng, Yougen Hu, Xianwen Liang, Yu Zhang, Rong Sun, Ching-Ping Wong
Flexible pressure sensors have attracted increasing research interest because of their potential applications for wearable sensing devices. Herein, a highly sensitive flexible pressure sensor is exhibited based on the elastomeric electrodes and a microarray architecture. Polydimethylsiloxane (PDMS) substrate, coated with silver nanowires (AgNWs), is used as the top electrode, while polyvinylidene fluoride (PVDF) as the dielectric layer. Several transfer processes are applied on seeking facile strategy for the preparation of the bottom electrode via embedding AgNWs into the PDMS film of microarray structure...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28749529/effect-and-acceptance-of-silver-diamine-fluoride-treatment-on-dental-caries-in-primary-teeth
#5
Jennifer Clemens, Jaana Gold, Jeffrey Chaffin
OBJECTIVES: Silver diamine fluoride (SDF) treatment has been identified as a potential solution to address the dental public health issues of untreated dental caries and insufficient access to care. The current study assessed the effectiveness of 38 percent SDF in arresting active dental caries lesions and in reducing or preventing associated dental pain and infections in young, at-risk children. METHODS: We enrolled 32 children aged 2-5 years with 118 active caries lesions in primary teeth from a community dental clinic in Oregon...
July 27, 2017: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/28688180/effect-of-silver-diamine-fluoride-sdf-on-the-dentin-pulp-complex-ex-vivo-histological-analysis-on-human-primary-teeth-and-rat-molars
#6
Glenda Rossi, Aldo Squassi, Patricia Mandalunis, Andrea Kaplan
The aim of this study was to determine the effect of SDF on the dentin-pulp complex using two models: teeth after SDF application (ex vivo) and experimental animal molars. A descriptive study was performed using two models. In the first model, primary teeth (ex vivo) with enamel-dentin caries, without pulp involvement and previously treated with 38% SDF, were evaluated by means of two techniques: (a) Scanning Electron Microscopy (SEM) and energy-dispersive X-ray detector (EDS) to determine qualitative and quantitative composition, and (b) brightfield optical microscopy (OM) after decalcification...
April 2017: Acta Odontológica Latinoamericana: AOL
https://www.readbyqxmd.com/read/28684840/prevention-of-secondary-caries-using-silver-diamine-fluoride-treatment-and-casein-phosphopeptide-amorphous-calcium-phosphate-modified-glass-ionomer-cement
#7
(no author information available yet)
Treatment of the cavity with silver diamine fluoride before placement of glass ionomer cement containing CPP-ACP enhances anticariogenic effect in vitro.
July 7, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28675862/bone-char-with-antibacterial-properties-for-fluoride-removal-preparation-characterization-and-water-treatment
#8
Lorena Delgadillo-Velasco, Virginia Hernández-Montoya, Francisco J Cervantes, Miguel A Montes-Morán, Diana Lira-Berlanga
In the present work, it was established a new method for the preparation of bone chars with a double purpose, i.e., the removal of fluoride from water and the antibacterial character. These adsorbents were obtained by doping a commercial bone char with Ag using different reagents. The optimal conditions for the enrichment with silver were established by following the Taguchi method and using as response variable the removal of fluoride from water. Optimal bone chars were thus prepared and they were characterized using FT-IR spectroscopy, SEM/EDX analysis, adsorption isotherms of N2 at -196 °C and X-ray diffraction...
July 1, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28646533/palladium-catalyzed-fluoroarylation-of-gem-difluoroalkenes
#9
Hai-Jun Tang, Ling-Zhi Lin, Chao Feng, Teck-Peng Loh
A Pd-catalyzed fluoroarylation of gem-difluoroalkenes with aryl halides is reported. By taking advantage of the in situ generated α-CF3 -benzylsilver intermediates derived from the nucleophilic addition of silver fluoride to gem-difluoroalkenes, this strategy bypasses the use of a strong base, thus enabling a mild and general synthetic method for ready access to non-symmetric α,α-disubstituted trifluoroethane derivatives.
June 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28642564/remineralisation-and-arresting-caries-in-children-with-topical-fluorides
#10
Neeraj Gugnani, Shalini Gugnani
Data sourcesThe Cochrane Library, PubMed, Embase and the ISI Web of Science.Study selectionEnglish language clinical trials in children with outcome measures including the remineralisation or arresting effect of caries by professional fluoride treatment were considered.Data extraction and synthesisTwo reviewers screened the studies and assessed risk of bias. Random effects meta-analysis was conducted.ResultsSeventeen studies were included, ten focused on remineralisation, seven on arresting carious lesions...
June 23, 2017: Evidence-based Dentistry
https://www.readbyqxmd.com/read/28544043/identification-of-v-type-nerve-agents-in-vapor-samples-using-a-field-portable-capillary-gas-chromatography-membrane-interfaced-electron-ionization-quadrupole-mass-spectrometry-instrument-with-tri-bed-concentrator-and-fluoridating-conversion-tube
#11
Yasuhiko Ohrui, Tomoki Nagoya, Naoko Kurimata, Manabu Sodeyama, Yasuo Seto
A field-portable gas chromatography-mass spectrometry (GC-MS) system (Hapsite ER) was evaluated for the detection of nonvolatile V-type nerve agents (VX and Russian VX (RVX)) in the vapor phase. The Hapsite ER system consists of a Tri-Bed concentrator gas sampler, a nonpolar low thermal-mass capillary gas chromatography column and a hydrophobic membrane-interfaced electron ionization quadrupole mass spectrometer evacuated by a non-evaporative getter pump. The GC-MS system was attached to a VX-G fluoridating conversion tube containing silver nitrate and potassium fluoride...
May 25, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28542863/mechanisms-of-silver-diamine-fluoride-on-arresting-caries-a-literature-review
#12
REVIEW
Irene Shuping Zhao, Sherry Shiqian Gao, Noriko Hiraishi, Michael Francis Burrow, Duangporn Duangthip, May Lei Mei, Edward Chin-Man Lo, Chun-Hung Chu
OBJECTIVE: To review the evidence regarding the mechanisms of silver diamine fluoride (SDF) for arresting caries. METHODS: A literature search was conducted using the keywords silver diamine fluoride, and its alternative names, in seven databases: PubMed, Embase and Scopus (English); China National Knowledge Infrastructure (Chinese); Bilioteca Virtual em Saude (Portuguese); Biblioteca Virtual en Salud Espana (Spanish); and Ichushi-Web (Japanese). The titles and abstracts were screened...
May 21, 2017: International Dental Journal
https://www.readbyqxmd.com/read/28537584/asymmetric-silver-catalysed-intermolecular-bromotrifluoromethoxylation-of-alkenes-with-a-new-trifluoromethoxylation-reagent
#13
Shuo Guo, Fei Cong, Rui Guo, Liang Wang, Pingping Tang
Fluorinated organic compounds are becoming increasingly important in pharmaceuticals, agrochemicals and materials science. The introduction of trifluoromethoxy groups into new drugs and agrochemicals has attracted much attention due to their strongly electron-withdrawing nature and high lipophilicity. However, synthesis of trifluoromethoxylated organic molecules is difficult owing to the decomposition of trifluoromethoxide anion and β-fluoride elimination from transition-metal-trifluoromethoxide complexes, and no catalytic enantioselective trifluoromethoxylation reaction has been reported until now...
June 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28521107/formation-of-fluorohydroxyapatite-with-silver-diamine-fluoride
#14
M L Mei, F Nudelman, B Marzec, J M Walker, E C M Lo, A W Walls, C H Chu
Silver diamine fluoride (SDF) is found to promote remineralization and harden the carious lesion. Hydroxyapatite crystallization is a crucial process in remineralization; however, the role of SDF in crystal formation is unknown. We designed an in vitro experiment with calcium phosphate with different SDF concentrations (0.38, 1.52, 2.66, 3.80 mg/mL) to investigate the effect of this additive on the nucleation and growth of apatite crystals. Two control groups were also prepared-calcium phosphate (CaCl2·2H2O + K2HPO4 in buffer solution) and SDF (Ag[NH3]2F in buffer solution)...
May 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28499178/degradation-of-gaseous-formaldehyde-via-visible-light-photocatalysis-using-multi-element-doped-titania-nanoparticles
#15
Maricris T Laciste, Mark Daniel G de Luna, Nolan C Tolosa, Ming-Chun Lu
This study developed a modified titanium dioxide photocatalyst doped with multi-element synthesized via sol-gel process to productize a novel photocatalyst. The study includes degradation of gaseous formaldehyde under visible light using the synthesized novel titanium dioxide photocatalyst. Varying molar ratios from 0 to 2 percent (%mole in titanium dioxide) of ammonium fluoride, silver nitrate and sodium tungstate as dopant precursors for nitrogen, fluorine, silver and tungsten were used. Photodegradation of gaseous formaldehyde was examined on glass tubular reactors illuminated with blue light emitting diodes (LEDs) using immobilized photocatalyst...
May 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28485841/prediction-of-extremely-strong-antiferromagnetic-superexchange-in-silver-ii-fluorides-challenging-the-oxocuprates-ii
#16
Dominik Kurzydłowski, Wojciech Grochala
Strong magnetic coupling between the spins of unpaired electrons is an essential ingredient of many fascinating physical phenomena. Here we report calculations using the hybrid HSE06 functional of magnetic superexchange constants, J, for a series of low-dimensional Cu(II) and Ag(II) binary and ternary systems with fluoride and oxide ligands. The calculations correctly reproduce the sign and size of the magnetic superexchange constants for prototypical antiferromagnetic (AFM) 1D (J1D ) and 2D (J2D ) systems, while overestimating the absolute values of J by about 11 %...
May 9, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28475081/effectiveness-of-silver-diamine-fluoride-in-caries-prevention-and-arrest-a-systematic-literature-review
#17
Violeta Contreras, Milagros J Toro, Augusto R Elías-Boneta, Angeliz Encarnación-Burgos
This study aimed to evaluate the scientific evidence regarding the effectiveness of silver diamine fluoride (SDF) in preventing and arresting caries in the primary dentition and permanent first molars. A systematic review (SR) was performed by 2 independent reviewers using 3 electronic databases (PubMed, ScienceDirect, and Scopus). The database search employed the following key words: "topical fluorides" AND "children" AND "clinical trials"; "topical fluorides" OR "silver diamine fluoride" AND "randomized controlled trial"; "silver diamine fluoride" AND "children" OR "primary dentition" AND "tooth decay"; "silver diamine fluoride" OR "sodium fluoride varnish" AND "early childhood caries"; and "silver diamine fluoride" AND "children"...
May 2017: General Dentistry
https://www.readbyqxmd.com/read/28457477/parental-perceptions-and-acceptance-of-silver-diamine-fluoride-staining
#18
Yasmi O Crystal, Malvin N Janal, Dylan S Hamilton, Richard Niederman
BACKGROUND: The caries arrest that can be achieved by using silver diamine fluoride (SDF) offers a minimally invasive and inexpensive alternative to traditional restorative caries treatment. The authors evaluated how the dentinal staining that is associated with SDF influences the acceptance of this treatment among parents of young children in the New York City metropolitan area. METHODS: The authors invited the parents of children who had experienced dental caries and who had appointments at the New York University Pediatric Dentistry Clinic and at several private clinics in New Jersey to participate in a Web-based survey designed to assess parents' demographics, perceptions of photographs of SDF-treated carious teeth, and acceptability of treatment in different behavior management scenarios...
April 27, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28453247/building-an-electronic-bridge-via-ag-decoration-to-enhance-kinetics-of-iron-fluoride-cathode-in-lithium-ion-batteries
#19
Yu Li, Xingzhen Zhou, Ying Bai, Guanghai Chen, Zhaohua Wang, Hui Li, Feng Wu, Chuan Wu
As a typical multielectron cathode material for lithium-ion batteries, iron fluoride (FeF3) and its analogues suffer from poor electronic conductivity and low actual specific capacity. Herein, we introduce Ag nanoparticles by silver mirror reaction into the FeF3·0.33H2O cathode to build the electronic bridge between the solid (active materials) and liquid (electrolyte) interface. The crystal structures of as-prepared samples are characterized by X-ray diffraction and Rietveld refinement. Moreover, the density of states of FeF3·0...
June 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28418413/-how-useful-is-restorative-care-in-the-primary-dentition
#20
J E Frencken
Too many children develop carious lesions and many such lesions progress into a dentine carious lesion. In 2010, the percentage of dentine carious lesions in the primary dentition of 6-year-old Dutch children that were restored was less than 50 per cent. Owing to research, the necessity to restore dentine carious lesions routinely has been called into question. Current understanding of cariologic principles point in the direction of a causal treatment that is based on cleaning accessible dentine carious cavities and those that can be made accessible, possibly supported by the application of silver diamine fluoride...
April 2017: Nederlands Tijdschrift Voor Tandheelkunde
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