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Fluoridation

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https://www.readbyqxmd.com/read/28530007/preventive-effect-of-cpp-acpf-paste-and-fluoride-toothpastes-against-erosion-and-erosion-plus-abrasion-%C3%A2-in-vitro-a-3d-profilometric-analysis
#1
Genaina Guimarães Soares, Pâmela Amorim Magalhães, Ana Beatriz Monteiro Fonseca, Monica Almeida Tostes, Eduardo Moreira da Silva, Thereza Christina Lopes Coutinho
PURPOSE: To evaluate the effect of CPP-ACPF paste and fluoride toothpastes on enamel subjected to erosion and erosion plus abrasion in vitro. MATERIALS AND METHODS: A total of 220 human enamel blocks were divided into eleven groups (n = 20): CPP-ACPF paste (MPP), potassium nitrate/sodium fluoride toothpaste (PE), sodium fluoride toothpaste (FD), fluoride-free toothpaste (SO) and control (erosion only with no paste or toothpastes; CO) according to the experimental design: erosion or erosion plus abrasion immediately after erosion (ERO+I-ABR) or 30 min after erosion (ERO+30min-ABR)...
May 19, 2017: Oral Health & Preventive Dentistry
https://www.readbyqxmd.com/read/28529503/response-of-methanogenic-microbial-communities-to-desiccation-stress-in-flooded-and-rain-fed-paddy-soil-from-thailand
#2
Andreas Reim, Marcela Hernández, Melanie Klose, Amnat Chidthaisong, Monthira Yuttitham, Ralf Conrad
Rice paddies in central Thailand are flooded either by irrigation (irrigated rice) or by rain (rain-fed rice). The paddy soils and their microbial communities thus experience permanent or arbitrary submergence, respectively. Since methane production depends on anaerobic conditions, we hypothesized that structure and function of the methanogenic microbial communities are different in irrigated and rain-fed paddies and react differently upon desiccation stress. We determined rates and relative proportions of hydrogenotrophic and aceticlastic methanogenesis before and after short-term drying of soil samples from replicate fields...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28529278/morphological-evaluation-of-artificial-caries-affected-dentin-after-applying-fcp-complex
#3
Ritsuko Mashiko, Go Inoue, Toru Nikaido, Junji Tagami
FCP-COMPLEX is a newly-developed solution that contains fluoride, calcium, and phosphoric acid. It has the potential to reinforce caries-affected dentin. The purpose of this study was to evaluate the effect of FCP-COMPLEX on the morphology of bovine artificial caries-affected dentin (ACAD). FCP-COMPLEX, 2% sodium fluoride solution, and distilled water were applied to bovine ACAD and the effect on acid-induced damage was observed. Scanning electron microscopy was used to evaluate morphology after acid application...
May 19, 2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28528743/-18-f-sodium-fluoride-positron-emission-tomography-for-molecular-imaging-of-coronary-atherosclerosis-based-on-computed-tomography-analysis
#4
Toshiro Kitagawa, Hideya Yamamoto, Shinya Toshimitsu, Ko Sasaki, Atsuhiro Senoo, Yumiko Kubo, Fuminari Tatsugami, Kazuo Awai, Yutaka Hirokawa, Yasuki Kihara
BACKGROUND AND AIMS: We aimed at evaluating the relation of (18)F-sodium fluoride ((18)F-NaF) uptake on positron emission tomography (PET) to coronary atherosclerosis detected and assessed by computed tomography (CT). METHODS: Thirty-two patients with one or more coronary atherosclerotic lesions detected on cardiac CT underwent (18)F-NaF PET/CT. Each coronary atherosclerotic lesion was evaluated on CT angiography for plaque types (calcified plaque [CP], non-calcified plaque [NCP], partially calcified plaque [PCP]), and the presence of CT-based high-risk features (minimum CT density <30 Hounsfield units and vascular remodeling index >1...
April 29, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28524666/on-the-possible-formation-of-h3o-cations-due-to-the-aluminum-fluoride-interactions-with-water
#5
Dorota Wileńska, Piotr Skurski, Iwona Anusiewicz
The isomeric structures formed by the aluminum fluoride (AlF3) system and surrounding water molecules were theoretically examined by employing MP2 and CCSD(T) methods and the aug-cc-pVDZ basis set together with the polarized continuum solvation model within a self-consistent reaction field treatment. The calculations performed for the AlF3∙n(H2O) systems (n=1 6) revealed that facial and meridional octahedral structures correspond to the lowest energy isomers for the AlF3∙4H2O, AlF3∙5H2O, and AlF3∙6H2O systems, whereas the isomers containing the H3O+ and AlF3OH- fragments were predicted to be less stable by only 5 7 kcal/mol which indicates the possible formation of the hydronium cations in such systems even at room temperature...
May 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28524451/tris-perfluorotolyl-borane-a-boron-lewis-superacid
#6
Norbert Werner Mitzel, Jan Schwabedissen, Leif Körte, Marcel Soffner, Sebastian Blomeyer, Christian Reuter, Yury Vishnevskiy, Beate Neumann, Georg Stammler
Tris(tetrafluoro-4-(trifluoromethyl)phenyl)borane (BTolF) was prepared by reacting boron tribromide with tetrameric F3CC6F4-Cu(I). The latter was generated from F3CC6F4MgBr and copper(I) bromide. Lewis acidities of BTolF evaluated by the Gutmann-Beckett method and calculated fluoride ion affinities are 9 and 10%, respecttively, higher than that of tris(penta-fluorophenyl)borane (BCF) and even higher than that of SbF5. The molecular structures of BTolF and BCF were determined by gas electron diffraction, that of BTolF also by single crystal X-ray diffraction...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28523795/efficacy-of-an-oral-health-literacy-intervention-among-indigenous-australian-adults
#7
Xiangqun Ju, David Brennan, Eleanor Parker, Helen Mills, Kostas Kapellas, Lisa Jamieson
OBJECTIVE: To determine the effect of an oral health literacy intervention on oral health literacy-related outcomes among rural-dwelling Indigenous Australian adults. METHODS: A total of 400 Indigenous adults (203 intervention and 197 control participants) were recruited into a randomized controlled trial; a functional, context-specific oral health literacy interventions were developed and implemented by Indigenous staff. The intervention comprised five sessions, each lasting 1...
May 19, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28523621/ecotoxicological-assessment-of-the-impact-of-fluoride-f-and-turbidity-on-the-freshwater-snail-physella-acuta-in-a-polluted-river-receiving-an-industrial-effluent
#8
Julio A Camargo, Álvaro Alonso
We carried out field studies and laboratory experiments to assess the impact of fluoride (F(-)) and turbidity on the freshwater snail Physella acuta in a polluted river receiving an industrial effluent (the middle Duraton River, Central Spain). Fluoride concentrations and turbidity levels significantly increased downstream from the industrial effluent (with the highest values being 0.6 mg F(-)/L and 55.2 nephelometric turbidity unit). In addition, higher deposition of fine inorganic matter was evident at polluted sampling sites...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28523580/chemical-characterization-of-surface-snow-in-istanbul-nw-turkey-and-their-association-with-atmospheric-circulations
#9
Asli Baysal, Hakki Baltaci, Nil Ozbek, Orhan Destanoglu, Gul Sirin Ustabasi, Gulcin Gumus
The understanding of the impurities in natural snow is important in realizing its atmospheric quality, soil characteristics, and the pollution caused to the environment. Knowledge of the occurrence of major ions and trace metals in the snow in the megacity of Istanbul is very limited. This manuscript attempts to understand the origin of major soluble ions (fluoride, acetate, formate, chlorite, chloride, nitrite, chlorate, bromide, nitrate, sulfate, phosphate, and perchlorate) and some trace metals (Fe, Mn, Cd, Co, Ni, Pb, Zn, Cu) in winter surface snow, collected in Istanbul, Turkey...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28521310/the-impact-of-the-demineralized-organic-matrix-on-the-effect-of-tif4-varnish-on-the-progression-of-dentin-erosive-loss
#10
Beatriz Martines de Souza, Mariele Vertuan, Marília Afonso Rabelo Buzalaf, Ana Carolina Magalhães
This in vitro study compared the effect of TiF4 varnish with that of NaF varnish, applied on pre-eroded bovine dentin samples, with respect to the progression of erosive loss, in the presence or absence of the demineralized organic matrix (DOM). One hundred and sixty bovine dentin samples were pre-eroded (0.1% citric acid, pH 2.5, 30 min). Half of the samples were subjected to the DOM removal (collagenase solution, 5 days). Samples with and without the DOM were treated according to the groups (n = 20 with DOM and 20 without DOM/group): TiF4 varnish (2...
May 19, 2017: Caries Research
https://www.readbyqxmd.com/read/28521109/cost-effectiveness-of-caries-prevention-in-practice-a-randomized-controlled-trial
#11
C O'Neill, H V Worthington, M Donaldson, S Birch, S Noble, S Killough, L Murphy, M Greer, J Brodison, R Verghis, M Tickle
A 2-arm parallel-group randomized controlled trial measured the cost-effectiveness of caries prevention in caries-free children aged 2 to 3 y attending general practice. The setting was 22 dental practices in Northern Ireland. Participants were centrally randomized into intervention (22,600 ppm fluoride varnish, toothbrush, a 50-mL tube of 1,450 ppm fluoride toothpaste, and standardized prevention advice) and control (advice only), both provided at 6-monthly intervals during a 3-y follow-up. The primary outcome measure was conversion from caries-free to caries-active states assessed by calibrated and blinded examiners; secondary outcome measures included decayed, missing, or filled teeth surfaces (dmfs); pain; and extraction...
May 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28521107/formation-of-fluorohydroxyapatite-with-silver-diamine-fluoride
#12
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/28520409/feco-anchored-reduced-graphene-oxide-framework-based-soft-composites-containing-carbon-nanotubes-as-highly-efficient-microwave-absorbers-with-excellent-heat-dissipation-ability
#13
Injamamul Arief, Sourav Biswas, Suryasarathi Bose
Conducting polymer composites containing ferromagnetic grafted-graphene derivatives are already appreciated for their lightweight, flexibility and cost effectiveness in terms of microwave absorption. To further leverage the said properties of this wonder material, we propose a highly efficient replacement by blending conducting multi-wall carbon nanotube (MWCNT) and FeCo anchored covalent cross-linked reduced graphene oxide (rGO) with polyvinylidene fluoride (PVDF). Interconnected conducting network of MWCNTs introduces higher electrical conductivity in the blend which is essential for microwave absorption...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28517028/aic-identifies-optimal-representation-of-longitudinal-dietary-variables
#14
John VanBuren, Joseph Cavanaugh, Teresa Marshall, John Warren, Steven M Levy
OBJECTIVES: The Akaike Information Criterion (AIC) is a well-known tool for variable selection in multivariable modeling as well as a tool to help identify the optimal representation of explanatory variables. However, it has been discussed infrequently in the dental literature. The purpose of this paper is to demonstrate the use of AIC in determining the optimal representation of dietary variables in a longitudinal dental study. METHODS: The Iowa Fluoride Study enrolled children at birth and dental examinations were conducted at ages 5, 9, 13, and 17...
May 18, 2017: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/28514705/a-topologically-diverse-family-of-fluoride-channels
#15
REVIEW
Christian B Macdonald, Randy B Stockbridge
Dual-topology proteins are likely evolutionary antecedents to a common motif in membrane protein structures, the inverted repeat. A family of fluoride channels, the Flucs, which protect microorganisms, fungi, and plants against cytoplasmic fluoride accumulation, has representatives of all topologies along this evolutionary trajectory, including dual-topology homodimers, antiparallel heterodimers, and, in eukaryotes, fused two-domain proteins with an inverted repeat motif. Recent high-resolution crystal structures of dual-topology homodimers, coupled with extensive functional information about both the homodimers and two-domain Flucs, provide a case study of the co-evolution of fold and function...
May 14, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/28514348/-dynamics-of-immunological-features-of-oral-liquid-in-children-with-chronic-catarrhal-gingivitis-living-on-polluted-territories-with-fluoride-and-iodine-deficiency
#16
N V Malko, E V Besvushko
The aim of the study was to assess the state of oral liquid (OL) immunity in children with chronic catarrhal gingivitis (CCG) living in adverse environmental conditions. 120 children aged 7-15 residing in ecologically unfavorable areas of Lviv region were examined, while 75 children living in 'relatively clean' region were involved in the control group. Chronic catarrhal gingivitis was diagnosed according to Danilevskiy classification (1994). The level of cytokines in oral liquid of 7-years-old children living in ecologically polluted region (EPR), was (198...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28514080/methane-emission-from-feather-moss-stands
#17
Dheeraj Kanaparthi, Andreas Reim, Guntars O Martinson, Bianca Pommerenke, Ralf Conrad
Data from remote sensing and Eddy towers indicate that forests are not always net sinks for atmospheric CH4 . However, studies describing specific sources within forests and functional analysis of microorganisms on sites with CH4 turnover are scarce. Feather moss stands were considered to be net sinks for carbon dioxide, but received little attention to their role in CH4 cycling. Therefore, we investigated methanogenic rates and pathways together with the methanogenic microbial community composition in feather moss stands from temperate and boreal forests...
May 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28514050/photoredox-controlled-mono-and-di-multifluoroarylation-of-c-sp-3-h-bonds-with-aryl-fluorides
#18
Jin Xie, Matthias Rudolph, Frank Rominger, A Stephen K Hashmi
A controllable mono- and di-multifluoroarylation of acyclic and cyclic N-aryl amines with aryl fluorides by photocatalyzed dual C(sp(3) )-H/C(sp(2) )-F functionalization has been developed, providing new access to a wide array of valuable α-fluoroarylated amines. In addition, the one-pot consecutive hetero-di-multifluoroarylation of N-aryl pyrrolidines and N,N-dimethylanilines was achieved with high to excellent diastereoselectivity. This new defluorinative C(sp(3) )-C(sp(2) ) coupling is distinguished by a broad scope, good regioselectivity, and mild conditions as well as gram-scale and late-stage applicability, and thus constitutes a significant advance in the arylation of unactivated C(sp(3) )-H bonds with aryl fluorides...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28513762/water-fluoridation-in-brazilian-cities-at-the-first-decade-of-the-21st-century
#19
Paulo Frazão, Paulo Capel Narvai
OBJECTIVE: To assess the coverage of the fluoridation of the public water supply in Brazilian municipalities at the first decade of the 21st century, according to population size and municipal human development index (MHDI). METHODS: We have used data produced by national information agencies and the United Nations Development Programme. Population size was separated into < 10,000, 10,000-50,000, and > 50,000 inhabitants. The MHDI was classified into < 0...
May 15, 2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28513732/reduced-001-tio2-x-photocatalysts-noble-metal-free-co2-photoreduction-for-selective-ch4-evolution
#20
Wenzhang Fang, Lhoussain Khrouz, Yi Zhou, Bin Shen, Chunyang Dong, Mingyang Xing, Shashank Mishra, Stéphane Daniele, Jinlong Zhang
The preparation of reduced TiO2 photocatalysts with high Ti(3+) concentration is a great challenge due to their instability in air. Here we report a new approach for the synthesis of reduced TiO2 with {001} facets exposed via a hydrothermal process. By the introduction of fluoride atoms, {001} and {101} facets are formed, which act as hole and electron collectors, respectively, for charge separation. By adjusting the volume of HF added, a rutile-anatase transition is observed for the first time. EPR spectra confirm the generation of Ti(3+) species in the bulk of TiO2, and Ti(3+) signals are studied in the anatase and rutile phases separately...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
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