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Silver fluoride

Rama Rao Tata, Michael Harmata
Treatment of α-hydroxy allenic sulfones with 10 mol % of silver fluoride in acetonitrile at ambient temperature furnished the corresponding 3-tosyl 2,5-dihydrofurans in excellent yields via a 5-endo-trig cyclization. The starting α-hydroxy allenic sulfones were prepared by lithiation of allenic sulfones and trapping with carbonyl compounds.
October 27, 2016: Organic Letters
L Paglia
Despite the general advances in dental care, dental caries is still a global health problem affecting many children. Occlusal surfaces of first permanent molars are the most susceptible sites in the developing permanent dentition. Dentists should use sealants or fluoride varnish - as well as other means - to limit the onset of tooth decay. Application of sealants is a recommended procedure to prevent or control caries. Sealing occlusal surfaces of newly erupted permanent molars in children and teenagers delays caries onset up to 48 months compared with unsealed teeth...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Hyeon Jun Sim, Changsoon Choi, Shi Hyeong Kim, Kang Min Kim, Chang Jun Lee, Youn Tae Kim, Xavier Lepró, Ray H Baughman, Seon Jeong Kim
Stretchable fiber and yarn triboelectric nanogenerator are sought for such applications as wearable sensing system such as cloth communication devices, electronic textiles, and robotic sensory skin. Unfortunately, previously reported triboelectric fiber and yarn are difficult to have stretchable property. We introduce here a new type of stretchable and weavable triboelectric fibers with microdiameter dimensions. The stretchable triboelectric fibers can be reversibly stretched up to 50% in tensile direction while generating voltage output proportional to the applied tensile strain...
October 11, 2016: Scientific Reports
Karthik Selvaraj, Vidhya Sampath, V Sujatha, S Mahalaxmi
AIMS: The aim of this in vitro study was to comparatively evaluate the microshear bond strength (MSBS) of etch-and-rinse and self-etch (ER and SE) bonding systems to dentin pretreated with silver diamine fluoride/potassium iodide (SDF/KI) and nanoleakage at the resin-dentin interface using transmission electron microscope (TEM). SUBJECTS AND METHODS: Seventy-two dentin slabs of 3 mm thickness were prepared from extracted human permanent third molars and divided into four groups (n = 18) based on the dentin surface treatment as follows: (1) ER adhesive bonding without dentin pretreatment; (2) SDF/KI pretreatment of dentin followed by ER adhesive bonding; (3) SE adhesive bonding without dentin pretreatment; and (4) SDF/KI pretreatment of dentin followed by SE adhesive bonding...
July 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
(no author information available yet)
The immediate application of potassium iodide to dental root caries treated with silver diamine fluoride improved the colour of the lesion from black to bright yellow, but this colour change was only short lived.
October 7, 2016: British Dental Journal
Priscila L L Freire, Allan J R Albuquerque, Isabela A P Farias, Teresinha Gonçalves da Silva, Jaciana Santos Aguiar, André Galembeck, Miguel A P Flores, Fabio C Sampaio, Thayza Christina Montenegro Stamford, Aronita Rosenblatt
The present study aimed to evaluate the antimicrobial activity and cytotoxicity of colloidal chitosan - silver nanoparticle - fluoride nanocomposites (CChAgNpFNc), with different silver nanoparticle shapes and sizes. The syntheses of CChAgNpFNc were performed with silver nitrate added to a chitosan solution, addition of a sodium borohydride solution and solid sodium fluoride. Solution of ascorbic acid was added to synthesize larger silver nanoparticles. CChAgNpFNc obtained: S1- 100% spherical, 8.7±3.1nm; S2- 97% spherical, 15...
September 15, 2016: International Journal of Biological Macromolecules
Ornnicha Thanatvarakorn, Md Sofiqul Islam, Syozi Nakashima, Alireza Sadr, Toru Nikaido, Junji Tagami
Root caries is developed because of demineralization followed by enzymatic collagen degradation. This in vitro study aimed to examine the inhibitory efficacy of ZnF2 on dentin demineralization and collagen degradation. Bovine dentin specimens were treated either with ZnF2 or HCl-acidified ZnF2 (ZnF2/HCl) and then demineralized. Anti-demineralization efficacy was assessed by TMR as mineral loss (ΔZ). The efficacy was compared with silver diammine fluoride (SDF), KF, and acidulated phosphate fluoride (APF). For evaluating anti-collagen degradation, EDTA-demineralized dentin specimens were treated by one of four fluoride agents [SDF, APF, ZnF2/HCl, NaF] followed by collagenase challenge...
October 1, 2016: Dental Materials Journal
Qian Zhou, Youxiu Lin, Mingdi Xu, Zhuangqiang Gao, Huanghao Yang, Dianping Tang
Herein, gold-silver bimetallic nanoclusters (Au-Ag NCs) with the high fluorescent intensity were first synthesized successfully and utilized for the fabrication of sensitive and specific sensing probes toward inorganic pyrophosphatase (PPase) activity with the help of copper ion (Cu(2+)) and inorganic pyrophosphate ion (PPi). Cu(2+) was used as the quencher of fluorescent Au-Ag NC, while PPi was employed as the hydrolytic substrate of PPase. The system consisted of PPi, Cu(2+) ion, and bovine serum albumin (BSA)-stabilized Au-Ag NC...
September 6, 2016: Analytical Chemistry
Nyein Nyein, Wai Kian Tan, Go Kawamura, Astunori Matsuda, Zainovia Lockman
Self-organized, 23 μm-thick anodic TiO2 nanotube (TNT) arrays were formed in sodium hydroxide/fluoride/ethylene glycol (EG) electrolyte at 60 V for 60 min. The presence of sodium hydroxide (NaOH) in the fluoride/EG electrolyte accelerates the formation of the TiO2 nanotube arrays. The anodic film was then decorated with silver nanoparticles (Ag NPs) by the photodeposition process and used as a photoanode in a rear-side-illuminated dye-sensitized solar cell. The Ag NPs decorated TNT arrays, with the former having diameters of 10-30 nm formed from 0...
September 2, 2016: Nanotechnology
Richard M Nthumbi, Jane C Ngila
A novel approach for the electrospinning and functionalization of nanocatalyst-loaded polyvinylidene fluoride/polyacrylonitrile (PVDF/PAN) composite grafted with acrylic acid (AA; which form polyacrylic acid (PAA) brush) and decorated with silver (Ag/PAN/PVDF-g-PAA-TiO2/Fe-Pd) designed for the dechlorination and photodegradation of pesticides was carried out. PAN was used both as a nitrogen dopant as well as a co-polymer. Smooth nanofibers were obtained by electrospinning a solution of 12:2 wt.% PVDF/PAN blend using dimethylformamide (DMF) as solvent...
July 21, 2016: Environmental Science and Pollution Research International
Vemina P Chalissery, Nikhil Marwah, Mohammed Almuhaiza, Abdulaziz M AlZailai, Elna P Chalisserry, Shilpa H Bhandi, Sukumaran Anil
OBJECTIVES: The purpose of this in vitro study is to compare the compressive strength (CS) and diametral tensile strength (DTS) of the zirconia-reinforced restorative material (Zirconomer®) with conventional glass ionomers (Fuji 1X) and amalgam. MATERIALS AND METHODS: Specimens (n = 120) were fabricated from silver amalgam, reinforced glass ionomer cement (GIC) (glass ionomer, Fuji 1X GC Corp.), and zirconia-reinforced glass ionomer (Zirconomer, Shofu Inc.) for testing the CS and DTS...
2016: Journal of Contemporary Dental Practice
Ruichang Gao, Tong Shi, Xiangdong Liu, Mengqin Zhao, Henglin Cui, Li Yuan
BACKGROUND: Because proteases play an important role in the fermentation of fish sauce, the purification and characterization of an extracellular protease from the halophilic archaeon Halogranum rubrum was investigated. RESULTS: The molecular mass of the protease was estimated to be approximately 47 kDa based on sodium dodecyl sulfate polyacrylamide gel electropheresis (SDS-PAGE) and native-PAGE analysis. The optimum conditions for catalytic activity were pH 8.0 and 50 °C...
July 5, 2016: Journal of the Science of Food and Agriculture
D Duangthip, M Jiang, C H Chu, E C M Lo
AIM: Dental restorations have long been used for the management of early childhood caries, but there is a need to have an evidence based approach when selecting the most appropriate restorative intervention to treat dentin caries in preschool children. This systematic review aimed to assess the effectiveness of restorative treatments of dentin caries in primary teeth in preschool children. MATERIALS AND METHODS: HASH(0x4d0d128) DESIGN: A systematic search of the main electronic databases (Pubmed, Cochrane Collaboration, EMBASE) was conducted to identify peer reviewed papers published in English in the years 1947-2014...
June 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Xiaochun Chen, Shaoming Yu, Liang Yang, Jianping Wang, Changlong Jiang
The instant and on-site detection of trace aqueous fluoride ions is still a challenge for environmental monitoring and protection. This work demonstrates a new analytical method and its utility of a paper sensor for visual detection of F(-) on the basis of the fluorescence resonance energy transfer (FRET) between photoluminescent graphene oxide (GO) and silver nanoparticles (AgNPs) through the formation of cyclic esters between phenylborinic acid and diol. The fluorescence of GO was quenched by the AgNPs, and trace F(-) can recover the fluorescence of the quenched photoluminescent GO...
July 14, 2016: Nanoscale
Kai Schwedtmann, Robin Schoemaker, Felix Hennersdorf, Antonio Bauzá, Antonio Frontera, Robert Weiss, Jan J Weigand
2-Phosphanyl-substituted imidazolium salts 2-PR2(4,5-Cl-Im)[OTf] (9a,b[OTf]) (4,5-Cl-Im = 4,5-dichloro-1,3-bis(2,6-di-isopropylphenyl)-imidazolium) (a: R = Cy, b: R = Ph) are prepared from the reaction of R2PCl (R = Cy, Ph) with NHC 8 (4,5-dichloro-1,3-bis(2,6-di-isopropylphenyl)-imidazolin-2-ylidene) in the presence of Me3SiOTf. 5-Phospanyl-substituted imidazolium salts 5-PR2(2,4-Cl-Im)[OTf] (10a,b[OTf]) are obtained in quantitative yield when a slight excess of the NHC 8 is used. 5-Phosphonio-substituted imidazolium salts 5-PR2Me(2,4-Cl-Im)[OTf]2 (14a,b[OTf]2) and 5-PR2F(2,4-Cl-Im)[OTf]2 (16a,b[OTf]2) result from methylation reaction or oxidation of 10a,b[OTf] with XeF2 and subsequent fluoride abstraction...
July 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Naoto Tsutsumi, Ryusei Kosugi, Kenji Kinashi, Wataru Sakai
Ferroelectric polymers are a candidate for versatile and cheap data storage memory devices, with easy processing for a large-scale device. Easy switching and large remanent polarization of preferentially formed β-crystal dipoles in a copolymer of vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) are promising properties for versatile memory devices. At higher frequency switching, however, the remanent polarization is reduced and a high coercive field, an electric field for polarization switching is required...
July 6, 2016: ACS Applied Materials & Interfaces
Travis Nelson, Joanna M Scott, Yasmi O Crystal, Joel H Berg, Peter Milgrom
PURPOSE: The purpose of this study was to investigate practice, teaching, and perceived barriers to the use of silver diamine fluoride and other caries control agents in U.S. pediatric dentistry residency programs. METHODS: A 14-question survey regarding use and teaching of caries control agents was sent via email to residency program directors in 2015. Survey participants responded, using a web-based survey tool, by completing a paper and pencil survey instrument, or by interview...
2016: Pediatric Dentistry
Tridib Kumar Sinha, Sujoy Kumar Ghosh, Rishi Maiti, Santanu Jana, Basudam Adhikari, Dipankar Mandal, Samit K Ray
Plasmonic characteristics of graphene-silver (GAg) nanocomposite coupled with piezoelectric property of Poly(vinylidene fluoride) (PVDF) have been utilized to realize a new class of self-powered flexible plasmonic nanogenerator (PNG). A few layer graphene has been prepared in a facile and cost-effective method and GAg doped PVDF hybrid nanocomposite (PVGAg) is synthesized in a one-pot method. The PNG exhibits superior piezoelectric energy conversion efficiency (∼15%) under the dark condition. The plasmonic behavior of GAg nanocomposite makes the PNG highly responsive to the visible light illumination that leads to ∼50% change in piezo-voltage and ∼70% change in piezo-current, leading to enhanced energy conversion efficiency up to ∼46...
June 22, 2016: ACS Applied Materials & Interfaces
R Li, E C M Lo, B Y Liu, M C M Wong, C H Chu
OBJECTIVES: To investigate the effectiveness of silver diammine fluoride (SDF) solution application in arresting dental root caries and to assess the color of arrested caries lesions. METHODS: This study was conducted in elderly centers in Hong Kong. A total of 83 elders with 157 root surfaces with active caries lesion were randomly allocated into 3 groups: Gp1 (placebo control)-annual application of soda water; Gp2-annual application of SDF solution; Gp3-annual application of SDF solution immediately followed by potassium iodide (KI) solution...
August 2016: Journal of Dentistry
Huyan Shi, Lixin Xue, Ailin Gao, Qingbo Zhou
Dual layer polyvinylidene fluoride (PVDF), antibacterial, hollow fiber, ultra-filtration composite membranes with antibacterial particles (silver (Ag) nano-particles loaded zeolite (Z-Ag)) in the outer layer were prepared with high water flux and desired pore sizes. The amounts of Ag(+) released from the composite membranes, freshly made and stored in water and salt solution, were measured. The result indicated that dual layer PVDF antibacterial hollow fiber containing Z-Ag (M-1-Ag) still possessed the ability of continuous release of Ag(+) even after exposure to water with high ionic content, showing a longer term resistance to bacterial adhesion and antibacterial activity than membrane doped with Z-Ag(+) (M-1)...
2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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