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https://www.readbyqxmd.com/read/28806687/mineralization-defects-are-comparable-in-fluorotic-impacted-human-teeth-and-fluorotic-mouse-incisors
#1
Rozita Jalali, Franck Guy, Samaneh Ghazanfari, Don Lyaruu, Leo van Ruijven, Pamela DenBesten, Stefania Martignon, Gina Castiblanco, Antonius L J J Bronckers
OBJECTIVE: Fluoride excess of 0.05-0.07mgF/kgbw/day in water or food additives like salt is the principal cause of endemic dental fluorosis. How fluoride causes these defects is not clear yet. Recent studies in rodents suggest that development of enamel fluorosis is associated with insufficient neutralization of protons released during the formation of hypermineralized lines. DESIGN: Here we examined whether hypermineralization could also be assessed by MicroCT in developing molar enamel of humans exposed to fluoride...
July 29, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28806680/sequestration-of-aluminium-iii-by-different-natural-and-synthetic-organic-and-inorganic-ligands-in-aqueous-solution
#2
Paola Cardiano, Rosalia Maria Cigala, Francesco Crea, Fausta Giacobello, Ottavia Giuffrè, Anna Irto, Gabriele Lando, Silvio Sammartano
The speciation of Al(3+) in aqueous solutions containing organic and inorganic ligands important from a biological (citrate (Cit(3-)), gluconate (Gluc(-)), lactate (Lac(-)), silicate (H2SiO4(2-)), carbonate (CO3(2-)), fluoride (F(-))) and industrial (Gantrez(®); polymethyl-vinyl-ether-co-maleic acids; GTZ S95 and GTZ AN169) point of view is reported. The stability constants of Al(3+)/L(z-) complexes (L(z-) = ligand with z(-) charge) were determined by potentiometry at T = 298.15 K and 0.10 ≤ I/M ≤ 1...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28806661/low-cost-and-non-fluoride-flowerlike-superhydrophobic-particles-fabricated-for-both-emulsions-separation-and-dyes-adsorption
#3
Fei Guo, Qiuying Wen, Zhiguang Guo
Green fluoride-free superhydrophobic hierarchical flowerlike iron-containing MnO2 particles were synthesized by a simple one-pot approach and subsequently modified by stearic acid. The special selective wettability toward water and oil makes the particle can be used in oil-in-water emulsion separation. In addition, the particle also can be applied as absorption material to remove dyes which are serious water contaminants. More importantly, as for the mixture of emulsion and dye, the particles also have the ability to remove both oil and dye, making the particles potential for wastewater purification in the future...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28805730/effect-of-polymer-matrix-on-the-structure-and-electric-properties-of-piezoelectric-lead-zirconatetitanate-polymer-composites
#4
Rui Li, Jun Zhou, Hujun Liu, Jianzhong Pei
Piezoelectric lead zirconatetitanate (PZT)/polymer composites were prepared by two typical polymer matrixes using the hot-press method. The micromorphology, microstructure, dielectric properties, and piezoelectric properties of the PZT/polymer composites were characterized and investigated. The results showed that when the condition of frequency is 10³ Hz, the dielectric and piezoelectric properties of PZT/poly(vinylidene fluoride) were both better than that of PZT/polyvinyl chloride (PVC). When the volume fraction of PZT was 50%, PZT/PVDF prepared by the hot-press method had better comprehensive electric property...
August 14, 2017: Materials
https://www.readbyqxmd.com/read/28800431/anharmonic-vibrational-analysis-of-s-trans-and-s-cis-conformers-of-acryloyl-fluoride-using-numerical-analytic-van-vleck-operator-perturbation-theory
#5
Sergey V Krasnoshchekov, Norman C Craig, Lidiya A Koroleva, Nikolay F Stepanov
A new gas-phase infrared (IR) spectrum of acryloyl fluoride (ACRF, CH2CHCFO) with a resolution of 0.1cm(-1) in the range 4000-450cm(-1) was measured. Theoretical ab initio molecular structures, full quartic potential energy surfaces (PES), and cubic surfaces of dipole moments and polarizability tensor components (electro-optical properties, EOP) of the s-trans and s-cis conformers of the ACRF were calculated by the second-order Møller-Plesset electronic perturbation theory with a correlation consistent Dunning triple-ζ basis set...
August 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28800286/clinical-pet-imaging-in-prostate-cancer
#6
Kathryn L Wallitt, Sairah R Khan, Suraiya Dubash, Henry H Tam, Sameer Khan, Tara D Barwick
Prostate cancer is the second most common cancer in men worldwide, with a wide spectrum of biologic behavior ranging from indolent low-risk disease to highly aggressive castration-resistant prostate cancer. Conventional imaging with computed tomography, magnetic resonance imaging, and bone scintigraphy is limited for the detection of nodal disease and distant bone metastases. In addition, advances in the available therapeutic options, both localized and systemic, drive the requirement for precise diagnostic and prognostic tools to refine the individual therapeutic approach at various times in the management of patients with prostate cancer...
August 11, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28800228/stoichiometric-and-catalytic-aryl-perfluoroalkyl-coupling-at-tri-tert-butylphosphine-palladium-ii-complexes
#7
Devin M Ferguson, James R Bour, Allan J Canty, Jeff W Kampf, Melanie S Sanford
This Communication describes studies of Ph-RF (RF = CF3 or CF2CF3) coupling at Pd complexes of general structure (P(t)Bu3)Pd(II)(Ph)(RF). The CF3 analogue participates in fast Ph-CF3 coupling (<5 min at 80 °C). However, the formation of side products limits the yield of this transformation as well as its translation to catalysis. DFT and experimental studies suggest that the side products derive from facile α-fluoride elimination at the 3-coordinate Pd(II) complex. Furthermore, they show that this undesired pathway can be circumvented by changing from a CF3 to a CF2CF3 ligand...
August 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28800147/reduction-in-bacteremia-after-brushing-with-a-triclosan-copolymer-dentifrice-a-randomized-clinical-study
#8
P K Sreenivasan, D Tischio-Bereski, D H Fine
AIM: The aims of this study were to; 1) test susceptibility to bacteremia in subjects with moderate gingivitis, and 2) compare the effects of brushing with a fluoride toothpaste (control) as compared to a triclosan/copolymer toothpaste (test) on those susceptible to repeated bacteremia. MATERIALS AND METHODS: 107 adult subjects were tested for repeated bacteremia after eating a hard apple. 29 bacteremia positive subjects were enrolled in a double-blind cross-over study designed to analyze the effects of a test toothpaste...
August 11, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28800094/socioeconomic-inequalities-in-visits-to-the-dentist-to-receive-professionally-applied-topical-fluoride-in-a-developing-country
#9
Miriam Del Socorro Herrera, Carlo Eduardo Medina-Solís, América Patricia Pontigo-Loyola, Rubén de la Rosa-Santillana, Leticia Ávila-Burgos, Rogelio José Scougall-Vilchis, Sonia Márquez-Rodríguez, Mirna Minaya-Sánchez, Alejandro José Casanova-Rosado
OBJECTIVE: To determine the frequency and associated factors of visits to the dentist in the last year by Nicaraguan schoolchildren to receive professionally applied topical fluoride (PATF). MATERIAL AND METHODS: A cross-sectional study was designed in children from public schools in the city of León, Nicaragua, were included. A series of socioeconomic, sociodemographic, and behavioural variables were collected through a questionnaire. The dependent variable was the visit to the dentist to receive professionally applied topical fluoride in the last year, which was dichotomised as (0) Did not receive PATF and (1) Yes received PATF...
August 11, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28798441/minimal-intervention-management-of-the-older-patient
#10
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/28798421/remineralisation-the-buzzword-for-early-mi-caries-management
#11
B T Amaechi
Minimal intervention (MI) dentistry aims to preserve dental tissues first and restore only when indicated, thus remineralisation of initial (non-cavitated) caries lesions, an integral part of caries management, is an essential treatment strategy in MI. With this understanding, dental practitioners are increasingly embracing the principle of non-operative treatment of initial caries lesions. The purpose of this review was to summarise the most recent literature published in non-operative management of dental caries...
August 11, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28798033/a-prospective-study-comparing-99m-tc-hdp-planar-bone-scintigraphy-and-whole-body-spect-ct-with-18-f-fluoride-pet-ct-and-18-f-fluoride-pet-mri-for-diagnosing-bone-metastases
#12
Johan Löfgren, Jann Mortensen, Sine Hvid Rasmussen, Claus Madsen, Annika Loft, Adam Espe Hansen, Peter Oturai, Karl Erik Jensen, Mette Louise Mørk, Michala Reichkendler, Liselotte Højgaard, Barbara M Fischer
We prospectively evaluate and compare the diagnostic performance of (99m)Tc-HDP planar bone scintigraphy (pBS), (99m)Tc-HDP SPECT/CT, (18)F-NaF PET/CT and (18)F-NaF PET/MRI for the detection of bone metastases. Methods: 117 patients with histologically proven malignancy referred for clinical pBS were prospectively enrolled. pBS and whole-body SPECT/CT were performed followed by (18)F-NaF PET/CT within 9 days. (18)F-NaF PET/MRI was also performed in 46 patients. A "truth panel" including clinical follow-up served as standard of reference...
August 10, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28795618/distribution-of-dental-plaque-and-gingivitis-within-the-dental-arches
#13
Prem K Sreenivasan, Kakarla V V Prasad
Objective The natural accumulation of supragingival plaque on surfaces of human teeth is associated with gingival inflammation and the initiation of common oral diseases. This study evaluated the distribution of dental plaque and gingivitis scores within the dental arches after prophylaxis. Methods Adult subjects from the Dharwad, India area representing the general population who provided written informed consent were scheduled for screening. Healthy subjects over the age of 18 years, not currently requiring any medical or dental care, and presenting with a complement of at least 20 natural teeth were recruited for this parallel design study...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28794938/selective-recognition-of-fluoride-by-using-a-benzobisimidazolium-derivative-through-aggregation-induced-fluorescence
#14
Dayoung Lee, Chiho Lee, Eun Jin Jun, Minji Lee, Sungnam Park, Juyoung Yoon
A new benzobisimidazolium derivative (1) bearing four naphthalene moieties was synthesized and demonstrated as an F(-) ion-selective fluorescent chemosensor. The fluorescence of 1 in acetonitrile (CH3CN) is significantly stronger with F(-) and acetate (CH3CO2(-)), but not with other anions (Cl(-), Br(-), I(-), HSO4(-), and H2PO4(-)). The fluorescence of 1 is enhanced selectively with F(-) in the presence of a small amount of water. Our DFT calculations indicate that the electrostatic interactions between the positively charged benzobisimidazolium moieties and F(-) play an important role in the formation of stable aggregates...
August 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28793985/long-term-hyperglycemia-naturally-induces-dental-caries-but-not-periodontal-disease-in-type-1-and-type-2-diabetic-rodents
#15
Yutaka Nakahara, Kiyokazu Ozaki, Tetsuro Matsuura
Periodontal disease (PD) in diabetic patients is described as the 6th complication of diabetes. We have previously shown that diabetes increases dental caries, and carious inflammation might have a strong effect on the adjacent periodontal tissue in diabetic rodent models. However, the possibility that hyperglycemia may induce PD in diabetic animals could not be completely eliminated. The goal of this study was to confirm the presence of PD in diabetic animal models by preventing carious inflammation with fluoride administration...
August 9, 2017: Diabetes
https://www.readbyqxmd.com/read/28792216/discrete-gef5-anion-structurally-characterized-with-a-readily-synthesized-imidazolium-based-naked-fluoride-reagent
#16
Blaž Alič, Melita Tramšek, Anton Kokalj, Gašper Tavčar
The recently prepared novel naked fluoride reagent 1,3-bis(2,6-diisopropylphenyl)imidazolium fluoride ([(L(Dipp))H][F]), treated with an excess of MF4 (M = Si, Ge), results in isolation of [(L(Dipp))H][MF5] products with the elusive trigonal bipyramidal MF5(-) anions. Specific steric characteristics of the [(L(Dipp))H](+) cation readily support isolation of monomeric and discrete trigonal bipyramidal fluorido anions of silicon and germanium. Based on combination of experimental results and DFT calculations, we demonstrate that the role of bulky cation is not solely due to steric hindering but also due to electrostatic effects, which are important in the design of such uncommon species...
August 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28792204/poly-vinylidene-fluoride-flexible-nanocomposite-films-with-dopamine-coated-giant-dielectric-ceramic-nanopowders-ba-fe0-5ta0-5-o3-for-high-energy-storage-density-at-low-electric-field
#17
Zhuo Wang, Tian Wang, Chun Wang, Yujia Xiao, Panpan Jing, Yongfei Cui, Yongping Pu
Ba(Fe0.5Ta0.5)O3/poly(vinylidene fluoride) (BFT/PVDF) flexible nanocomposite films are fabricated by tape-casting using dopamine (DA) modified BFT nanopowders and PVDF as matrix polymer. After surface modification by DA layer with a thickness of 5 nm, the interfacial couple interaction between BFT and PVDF is enhanced, resulting in less hole defects at the interface. Then the dielectric constant ('), loss tangent (tan δ) and AC conductivity of nanocomposite films are reduced. Meanwhile, the value of reduced dielectric constant (Δ') and strength of interfacial polarization (k) is introduced to illustrate the effect of DA on dielectric behavior of nanocomposite films...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792197/transparent-copper-loaded-chitosan-silica-antibacterial-coatings-with-long-term-efficacy
#18
Debirupa Mitra, Min Li, En-Tang Kang, Koon-Gee Neoh
Bacteria-contaminated inanimate surfaces within hospitals and clinics result in transmission of pathogens via direct or indirect contact, leading to increased risk of healthcare-associated infections (HAI). The use of antibacterial coatings is a potential way of reducing the bacterial burden, but many surfaces like instrument panels and monitors necessitate the coatings to be transparent while being highly antibacterial. In this work, silica nanoparticles (SiO2 NPs) were first grown over a layer of acrylated quaternized chitosan (AQCS) covalently immobilized on commercially available transparent polyvinyl fluoride (PVF) films...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792119/sufex-based-polysulfonate-formation-from-ethenesulfonyl-fluoride-amine-adducts
#19
Hua Wang, Feng Zhou, Gerui Ren, Qinheng Zheng, Hongli Chen, Bing Gao, Liana Klivansky, Yi Liu, Bin Wu, Qingfeng Xu, Jianmei Lu, K Barry Sharpless, Peng Wu
The SuFEx-based polycondensation between bisalkylsulfonyl fluorides (AA monomers) and bisphenol bis(t-butyldimethylsilyl) ethers (BB monomers) using [Ph3 P=N-PPh3 ](+) [HF2 ](-) as the catalyst is described. The AA monomers were prepared via the highly reliable Michael addition of ethenesulfonyl fluoride and amines/anilines while the BB monomers were obtained from silylation of bisphenols by t-butyldimethylsilyl chloride. With these reactions, a remarkable diversity of monomeric building blocks was achieved by exploiting readily available amines, anilines, and bisphenols as starting materials...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28792058/%C3%AE-dicyanovinyl-substituted-porphyrinogen-synthesis-a-reversible-sensor-for-picric-acid-among-explosives-and-a-unique-sensor-for-cyanide-and-fluoride-ions-by-switching-between-various-porphyrinoid-states
#20
Mandeep K Chahal, Muniappan Sankar
β-Dicyanovinyl substituted porphyrinogen (OxP-MN) was synthesized and utilized as a novel multifunctional sensor for the detection of biologically and environmentally important analytes. OxP-MN (1) acts as a selective and reversible probe for rapid colorimetric detection of picric acid (PA) among other nitroaromatics by switching between two porphyrinoid states. This system displayed a higher β2 value of 1.7 × 10(8) M(-2) and was able to detect PA down to 1.12 ppm (4.99 μM). β-Dicyanovinyl substituted porphyrinogen (OxP-MN) reported here contains a porphyrinogen anion binding site and a dicyanovinyl group as a cyanide-dependent reactive subunit...
August 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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