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Silver fluoride

Adam Grzelak, Jakub Gawraczyński, Tomasz Jaroń, Dominik Kurzydłowski, Armand Budzianowski, Zoran Mazej, Piotr J Leszczyński, Vitali B Prakapenka, Mariana Derzsi, Viktor V Struzhkin, Wojciech Grochala
A combined experimental-theoretical study of silver(I) and silver(II) fluorides under high pressure is reported. For Ag(I), the CsCl-type structure is stable to at least 39 GPa; the overtone of the IR-active mode is seen in the Raman spectrum. Its Ag(II)F2 sibling is a unique compound in many ways: it is more covalent than other known difluorides, crystallizes in a layered structure, and is enormously reactive. Using X-ray diffraction and guided by theoretical calculations (density functional theory), we have been able to elucidate crystal structures of high-pressure polymorphs of AgF2...
November 15, 2017: Inorganic Chemistry
Ryan N Hansen, R Mike Shirtcliff, Jeanne Dysert, Peter M Milgrom
PURPOSE: The purpose of this study was to assess the impact of silver nitrate/fluoride varnish (SN/FV) on care costs. METHODS: A retrospective matched cohort study, using Oregon Medicaid claims (January 1, 2012 to December 31, 2014) for patients younger than 21 years old, compared patients treated with SN/FV to matched patients not treated with SN/FV. The number of services and costs were compared using student's t test and generalized estimating equation (GEE) regression models...
July 15, 2017: Pediatric Dentistry
Xiao-Xia Zhou, Yu-Jian Lai, Rui Liu, Shasha Li, Jing-Wen Xu, Jing-Fu Liu
Efficient separation and preconcentration of trace nanoparticulate silver (NAg) from large-volume environmental waters is a prerequisite for reliable analysis and therefore understanding the environmental processes of silver nanoparticles (AgNPs). Herein, we report the novel use of polyvinylidene fluoride (PVDF) filter membrane for disk-based solid phase extraction (SPE) of NAg in 1 L of water samples with the disk-based SPE system, which consists of a syringe pump and a syringe filter holder to embed the filter membrane...
November 9, 2017: Environmental Science & Technology
Salina K Chhokar, Lory Laughter, Dorothy J Rowe
Purpose: Silver diamine fluoride (SDF) is an inexpensive, non-invasive, antimicrobial liquid used to treat carious lesions and decrease sensitivity. The purpose of this study was to assess the perceptions of registered dental hygienists in alternative practice (RDHAP) regarding the use of SDF to treat dental caries.Methods: A 16-item survey designed to evaluate RDHAP's familiarity and perceptions of SDF was electronically distributed to 222 RDHAPs practicing in the state of California. A survey research software program collected and tabulated responses, calculated response frequencies for each survey item, and determined statistical relationships among variables, using cross tabulation analysis...
August 2017: Journal of Dental Hygiene: JDH
Derek Richards
Data sourcesPubMed, Embase, Scopus, China National Knowledge Infrastructure (CNKI), Ichushi-web, Biblioteca Virtual en Salud Espana (BVSE) and Biblioteca Virtual em Saude (BVS) databases. There were no limits on language or publication dates.Study selectionTwo reviewers selected prospective clinical studies investigating SDF treatment for caries prevention in children.Data extraction and synthesisData was abstracted independently by two reviewers and risk of bias assessed. Meta-analysis was performed on studies in which the caries-arresting rate using 38% SDF solution on primary teeth could be obtained or calculated...
October 27, 2017: Evidence-based Dentistry
Yasmi O Crystal, Abdullah A Marghalani, Steven D Ureles, John Timothy Wright, Rosalyn Sulyanto, Kimon Divaris, Margherita Fontana, Laurel Graham
BACKGROUND: This manuscript presents evidence-based guidance on the use of 38 percent silver diamine fluoride (SDF) for dental caries management in children and adolescents, including those with special health care needs. A guideline workgroup formed by the American Academy of Pediatric Dentistry developed guidance and an evidence-based recommendation regarding the application of 38 percent SDF to arrest cavitated caries lesions in primary teeth. TYPES OF STUDIES REVIEWED: The basis of the guideline's recommendation is evidence from an existing systematic review "Clinical trials of silver diamine fluoride in arresting caries among children: A systematic review...
September 15, 2017: Pediatric Dentistry
Romina Brignardello-Petersen
No abstract text is available yet for this article.
October 14, 2017: Journal of the American Dental Association
Ana Carolina Magalhães
Root caries lesions (RCLs) are highly prevalent in elderly and can negatively impact the quality of life. Therefore, preventive therapies should be applied to control or to arrest RCLs. This chapter will discuss the application of fluoride, a conventional preventive therapy, to control RCLs. Among the self-applied products, there is strong evidence that 5,000 ppm F toothpaste is more effective in arresting RCLs (by increasing hardness) and in preventing new lesions (PF of 51%) compared to 1,100-1,450 ppm F toothpastes, in 6-month clinical trials...
2017: Monographs in Oral Science
Benqiang Cui, Shichong Jia, Etsuko Tokunaga, Norimichi Saito, Norio Shibata
A novel strategy for the synthesis of arylsulfur pentafluorides by silver carbonate-induced Cl-F exchange fluorination of arylsulfur chlorotetrafluorides is reported. This fluorination does not require any exogenous fluoride sources. Rather, the reaction proceeds via the self-immolation of the substrate Ar-SF4Cl.
October 17, 2017: Chemical Communications: Chem Comm
Henrik Gotfredsen, Line Broløs, Thomas Holmstrøm, Jacob Sørensen, Alberto Viñas Muñoz, Martin Drøhse Kilde, Anders B Skov, Marco Santella, Ole Hammerich, Mogens Brøndsted Nielsen
Boron subphthalocyanines (SubPcs) are powerful chromophoric heterocycles that can be synthetically modified at both axial and peripheral positions. Acetylenic scaffolding offers the possibility of building large, unsaturated carbon-rich frameworks that can exhibit excellent electron-accepting properties, and when combined with SubPcs it presents a convenient method for preparing interesting chromophore-acceptor architectures. Here we present synthetic methodologies for the post-functionalization of the relatively sensitive SubPc chromophore via acetylenic coupling reactions...
October 11, 2017: Organic & Biomolecular Chemistry
Duangporn Duangthip, Kitty Jieyi Chen, Sherry Shiqian Gao, Edward Chin Man Lo, Chun Hung Chu
Early childhood caries (ECC) is a significant global health problem affecting millions of preschool children worldwide. In general, preschool children from families with 20% of the lowest family incomes suffered about 80% of the ECC. Most, if not all, surveys indicated that the great majority of ECC was left untreated. Untreated caries progresses into the dental pulp, causing pain and infection. It can spread systemically, affecting a child's growth, development and general health. Fundamental caries management is based on the conventional restorative approach...
October 10, 2017: International Journal of Environmental Research and Public Health
Ana Cláudia Chibinski, Letícia Maíra Wambier, Juliana Feltrin, Alessandro Dourado Loguercio, Denise Stadler Wambier, Alessandra Reis
A systematic review was performed to evaluate the efficacy of silver diamine fluoride (SDF) in controlling caries progression in children when compared with active treatments or placebos. A search for randomized clinical trials that evaluate the effectiveness of SDF for caries control in children compared to active treatments or placebos with follow-ups longer than 6 months was performed in PubMed, Scopus, Web of Science, LILACS, BBO, Cochrane Library, and grey literature. The risk of bias tool from the Cochrane Collaboration was used for quality assessment of the studies...
October 4, 2017: Caries Research
Kulnipa Punyanirun, Thanida Yospiboonwong, Thansinee Kunapinun, Panida Thanyasrisung, Chutima Trairatvorakul
OBJECTIVES: To investigate the remineralizing effect of 38% silver diamine fluoride (SDF) application on enamel artificial caries in adjunct to 1000ppm fluoride toothpaste compared with fluoride toothpaste alone by analyzing the mineral density, depth of remineralization, and remineralization percentage of the lesions. METHODS: Eighteen artificial caries slabs were created from the proximal surfaces of nine chemically demineralized premolars. The slabs were scanned by Micro-Computed Tomography (Micro-CT) to determine the baseline mineral density of the initial lesions and randomly allocated into 2 groups...
September 13, 2017: Journal of Dentistry
Caiping Ding, Xuanyu Cao, Cuiling Zhang, Tangrong He, Nan Hua, Yuezhong Xian
In this work, a novel phenomenon was discovered that the fluorescence intensity of silver sulfide quantum dots (Ag2S QDs) could be enhanced in the presence of rare earth ions through aggregation-induced emission (AIE). Based on the strong coordination between rare earth ions and F(-), a facile and label-free strategy was developed for the detection of F(-) in living cells. Ag2S QDs were synthesized using 3-mercaptopropionic acid as sulfur source and stabilizer in aqueous solution. The near infrared (NIR) emitting QDs exhibited excellent photostalilty, high quantum yield and low toxic...
September 28, 2017: Nanoscale
Marit Kjærvik, Anja Hermanns, Paul Dietrich, Andreas Thissen, Stephan Bahr, Benjamin Ritter, Erhard Kemnitz, Wolfgang Unger
Two systems of suspended nanoparticles have been studied with near-ambient pressure XPS: silver nanoparticles in water and strontium fluoride - calcium fluoride core-shell nanoparticles in ethylene glycol. The corresponding dry samples were measured under ultra high vacuum for comparison. The results obtained under near-ambient pressure were overall comparable to those obtained under ultra high vacuum, although measuring silver nanoparticles in water requires a high pass energy and a long acquisition time. A shift towards higher binding energies was found for the silver nanoparticles in aqueous suspension compared to the corresponding dry sample, which can be assigned to a change of surface potential at the water-nanoparticle interface...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Lola Giusti, Cathrine Steinborn, Maya Steinborn
A technique for using silver diamine fluoride (SDF) as part of a regimen to help maintain dental prostheses in a patient with scleroderma and at high risk of caries is presented. Medically compromised, xerostomic, or elderly patients generally face greater risk of caries and specifically with prosthetic retainer teeth. SDF is a minimally invasive solution to this problem. A technique is described for using SDF to arrest and prevent new caries with the goal of maintaining fixed and removable prostheses and supporting teeth in a cost-effective manner...
September 6, 2017: Journal of Prosthetic Dentistry
Peter Milgrom, Jeremy A Horst, Sharity Ludwig, Marilynn Rothen, Benjamin W Chaffee, Svetlana Lyalina, Katherine S Pollard, Joseph L DeRisi, Lloyd Mancl
OBJECTIVES: The Stopping Cavities Trial investigated effectiveness and safety of 38% silver diamine fluoride in arresting caries lesions. MATERIALS AND METHODS: The study was a double-blind randomized placebo-controlled superiority trial with 2 parallel groups. The sites were Oregon preschools. Sixty-six preschool children with ≥1 lesion were enrolled. Silver diamine fluoride (38%) or placebo (blue-tinted water), applied topically to the lesion. The primary endpoint was caries arrest (lesion inactivity, Nyvad criteria) 14-21days post intervention...
August 30, 2017: Journal of Dentistry
Jaana Gold
ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Clinical trials of silver diamine fluoride in arresting caries among children: A systematic review. Gao SS, Zhao IS, Hiraishi N, Duangthi D, Mei ML, Lo ECM, Chu CH. JDR-CTR 2016;1:201-10. SOURCE OF FUNDING: Academic research funding from the General Research Fund of the Research Grants Council of Hong Kong TYPE OF STUDY/DESIGN: Systematic review and meta-analysis.
September 2017: Journal of Evidence-based Dental Practice
M H T Fung, D Duangthip, M C M Wong, E C M Lo, C H Chu
This 30-mo randomized clinical trial compared the effectiveness of 2 concentrations (12% or 38%) of silver diamine fluoride (SDF) and 2 periodicity of application (once or twice a year) in arresting cavitated dentin caries in primary teeth. Children aged 3 to 4 y who had at least 1 active cavitated caries lesion were enrolled and randomly allocated into 4 groups for intervention. Group 1 had 12% SDF applied annually (every 12 mo), group 2 had 12% SDF applied semiannually (every 6 mo), group 3 had 38% SDF applied annually, and group 4 had 38% SDF applied semiannually...
August 1, 2017: Journal of Dental Research
Dora Coelho, Ana Sampaio, Carla J S M Silva, Helena P Felgueiras, M Teresa P Amorim, Andrea Zille
Two different nanofibrous antibacterial membranes containing enzymatically synthesized poly(catechol) (PC) or silver nitrate (AgNO3, positive control) blended with poly(vinyl alcohol) (PVA) and electrospun onto a poly(vinylidene fluoride) (PVDF) basal disc to generate thin-film composite midlayers were produced for water ultrafiltration applications. The developed membranes were thoroughly characterized in terms of morphology, chemical composition, and general mechanical and thermal features, antimicrobial activity, and ultrafiltration capabilities...
September 27, 2017: ACS Applied Materials & Interfaces
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