2,853 results match your criteria fluoride release


Sesame Oil () as a New Challenge for Reinforcement of Conventional Glass Ionomer Cement, Could It Be?

Authors:
Neven S Aref

Int J Dent 2021 22;2021:5516517. Epub 2021 Mar 22.

Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.

Purpose: Despite the advantages of glass ionomer cement (GIC) including chemical bonding to the tooth structure and fluoride release, its low-grade mechanical properties make it a topic for research. Accordingly, this study was conducted to assess the ability of sesame oil as a natural bioactive additive to reinforce conventional glass ionomer cement.

Materials And Methods: Sesame oil was blended into the liquid component of the cement in ratios of 3 and 5 (v/v%). Read More

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Reaction Mechanisms during Atomic Layer Deposition of AlF Using Al(CH) and SF Plasma.

J Phys Chem C Nanomater Interfaces 2021 Feb 10;125(7):3913-3923. Epub 2021 Feb 10.

Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Metal fluorides generally demonstrate a wide band gap and a low refractive index, and they are commonly employed in optics and optoelectronics. Recently, an SF plasma was introduced as a novel co-reactant for the atomic layer deposition (ALD) of metal fluorides. In this work, the reaction mechanisms underlying the ALD of fluorides using a fluorine-containing plasma are investigated, considering aluminum fluoride (AlF) ALD from Al(CH) and an SF plasma as a model system. Read More

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February 2021

Release and Recharge of Fluoride Ions from Acrylic Resin Modified with Bioactive Glass.

Polymers (Basel) 2021 Mar 27;13(7). Epub 2021 Mar 27.

Department of Prosthodontics, Wroclaw Medical University, 50-425 Wroclaw, Poland.

Background: Oral hygiene is essential for maintaining residual dentition of partial denture wearers. The dental material should positively affect the oral environment. Fluoride-releasing dental materials help to inhibit microbial colonization and formation of plaque as well as to initiate the remineralization process in the early cavity area. Read More

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Removal of Fluoride from Water Using a Calcium-Modified Dairy Manure-Derived Biochar.

J Environ Eng (New York) 2020 Dec;146(12):1-10

Dept. of Civil and Environmental Engineering, Southern Methodist Univ., Dallas, TX 75275.

This study investigated the removal of fluoride from water using a calcium-modified dairy manure-derived biochar (Ca-DM500). The Ca-DM500 showed a 3.82 - 8. Read More

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December 2020

Do viscosity and wettability of fluoride varnishes affect their fluoride release?

J Clin Exp Dent 2021 Mar 1;13(3):e221-e226. Epub 2021 Mar 1.

Professor, Universidad Peruana Cayetano Heredia, School of Stomatology, Department of Dentistry for Children and Adolescents,Lima, Peru.

Background: There are several brands of fluoride varnishes in the market, but the dynamics of fluoride release from each one might be different. The purpose of this study was to evaluate in vitro the release of fluorides by fluoride varnishes and to determine the correlation with viscosity and wettability.

Material And Methods: Forty four enamel blocks 5x5 mm were randomly divided into 4 groups (n=11) ((Duraphat®, Clinpro™ White Varnish, Flúor Protector® and control). Read More

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Appraisal of groundwater quality and associated risks in Mansa district (Punjab, India).

Environ Monit Assess 2021 Mar 4;193(4):159. Epub 2021 Mar 4.

Department of Chemistry, Centre for Advanced Studies, Guru Nanak Dev University, Amritsar, Punjab, 143005, India.

Mansa district in Malwa region of South-West Punjab has gained significant attention due to elevation in number of patients suffering from diverse diseases especially cancer and consumption of contaminated groundwater could be one of the possible reasons. The present study reports the assessment of 59 groundwater samples from Mansa district by evaluating physicochemical characteristics, potentially toxic element (PTE) contamination and associated health implications followed by analysis of water quality status using various indices. Multivariate statistics were applied for source identification of PTEs in groundwater. Read More

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Antibacterial coating of tooth surface with ion-releasing pre-reacted glass-ionomer (S-PRG) nanofillers.

Heliyon 2021 Feb 2;7(2):e06147. Epub 2021 Feb 2.

Department of Biomedical Materials and Engineering, Faculty of Dental Medicine, Hokkaido University, N13 W7, Kita-ku, Sapporo, Hokkaido, 060-8586, Japan.

Objectives: Surface pre-reacted glass-ionomer (S-PRG) fillers release antibacterial borate and fluoride ions. We fabricated nanoscale S-PRG fillers (S-PRG nanofillers) for antibacterial coating of tooth surfaces and assessed the antibacterial effects of this coating in vitro. In addition, we creating a canine model of periodontitis to evaluate the effectiveness of S-PRG nanofiller application on tooth roots and improvement of periodontal parameters. Read More

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February 2021

Fluoride-Releasing Restorative Materials: The Effect of a Resinous Coat on Ion Release.

Acta Stomatol Croat 2020 Dec;54(4):371-381

Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gundulićeva 5, Zagreb, Croatia.

Objective: To determine the effect of two adhesive systems and a glass ionomer coating resin on fluoride release and concurrent pH changes over a period of 168 days.

Material And Methods: Four restorative materials were investigated: a giomer Beautiful II, an "alkasite" material Cention, a conventional composite Filtek Z250, and a glass ionomer cement Fuji IX Extra. Light-cured composite specimens were coated using G-aenial Bond and Clearfil Universal Bond Quick. Read More

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December 2020

Fluoride release from two types of fluoride-containing orthodontic adhesives: Conventional versus resin-modified glass ionomer cements-An in vitro study.

PLoS One 2021 26;16(2):e0247716. Epub 2021 Feb 26.

Department of Orthodontics, Faculty of Health, University of Witten/Herdecke, Witten, Germany.

Introduction: Development of white spot lesions (WSLs) during orthodontic treatment is a common risk factor. Fixation of the orthodontic appliances with glass ionomer cements could reduce the prevalence of WSL's due to their fluoride release capacities. The purpose of this study was to evaluate differences of fluoride release properties from resin-modified and conventional glass ionomer cements (GICs). Read More

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February 2021

Remineralising fluorine containing bioactive glass composites.

Dent Mater 2021 Apr 23;37(4):672-681. Epub 2021 Feb 23.

Dental Physical Sciences, Dental Institute, Barts and the London Medical School, Queen Mary University of London, London E1 4NS, UK. Electronic address:

Objectives: The objective was to investigate the mechanical properties, fluoride release and apatite formation of resin based dental composites based on a fluoride containing Bioactive Glass (BG) with and without a silylating agent.

Methods: A SiO-PO-CaO-SrO-NaO-CaF BG was synthesized by the melt quench route. This glass and a commercially available inert glass (IG) were incorporated into a light cured BisGMA-TEGMA resin. Read More

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Antimicrobial properties, mechanics, and fluoride release of ionomeric cements modified by red propolis.

Angle Orthod 2021 Feb 25. Epub 2021 Feb 25.

Objectives: To evaluate the antimicrobial activity, mechanical properties, and fluoride release capacity of glass ionomer cement (GIC) used for cementing orthodontic bands and modified by ethanolic extract of red propolis (EERP) in different concentrations.

Materials And Methods: Two orthodontic GICs containing EERP at 10%, 25%, and 50%, were used. The following assays were carried out: cell viability tests against Streptococcus mutans and Candida albicans, diametral tensile strength, compressive strength, shear bond strength, microhardness, and fluoride release capacity. Read More

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February 2021

Comparative evaluation of fluoride release and re-release and recharge potential of Zirconomer Improved and Cention.

J Conserv Dent 2020 Jul-Aug;23(4):402-406. Epub 2021 Jan 16.

Department of Oral Medicine and Radiology, Rama Dental College and Hospital, Kanpur, Uttar Pradesh, India.

Background: The cariostatic action associated with fluoride-releasing restorative materials is mainly attributed to a sustained release of fluoride. This research aims on comparing Cention N and Zirconomer Improved fluoride release and re-release.

Methods: Test materials were grouped into two categories containing 15 samples each. Read More

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January 2021

Groundwater defluoridation efficacy of manganese-oxide-coated alumina prepared via two-step heating.

Environ Technol 2021 Mar 4:1-13. Epub 2021 Mar 4.

Instituto de Ciências Ambientais, Químicas e Farmacêuticas da Universidade Federal de São Paulo, Diadema, Brazil.

Fluoride concentrations in groundwater can be high in some Brazilian aquifers and therefore these waters should be treated before consumption. This study assessed the properties of Mn-oxide-coated alumina (AM) prepared by two-step heating in water defluoridation. The release of secondary contaminants (e. Read More

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Electrically Stimulated Tunable Drug Delivery From Polypyrrole-Coated Polyvinylidene Fluoride.

Front Chem 2021 5;9:599631. Epub 2021 Feb 5.

Department of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, San Antonio, TX, United States.

Electrical stimulus-responsive drug delivery from conducting polymers such as polypyrrole (PPy) has been limited by lack of versatile polymerization techniques and limitations in drug-loading strategies. In the present study, we report an chemical polymerization technique for incorporation of biotin, as the doping agent, to establish electrosensitive drug release from PPy-coated substrates. Aligned electrospun polyvinylidene fluoride (PVDF) fibers were used as a substrate for the PPy-coating and basic fibroblast growth factor and nerve growth factor were the model growth factors demonstrated for potential applications in musculoskeletal tissue regeneration. Read More

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February 2021

Consensus on glass-ionomer cement thresholds for restorative indications.

J Dent 2021 Apr 18;107:103609. Epub 2021 Feb 18.

Queen Mary University of London, Mile End Rd, Bethnal Green, London E1 4NS, England, United Kingdom.

Objective: The aim of this paper is to present the results of a consensus meeting on the threshold property requirements for the clinical use of conventional glass-ionomer cements (GICs) for restorative indications.

Methods: Twenty-one experts on GICs evaluated the results of tests on mechanical and optical properties of 18 different brands of restorative GICs: Bioglass R [B], Chemfil Rock [CR], Equia Forte [EF], Gold Label 2 [GL2], Gold Label 9 [GL9], Glass Ionomer Cement II [GI], Ionglass [IG], Ion Z [IZ], Ionomaster [IM], Ionofil Plus [IP], Ionostar Plus [IS], Ketac Molar Easymix [KM], Magic Glass [MG], Maxxion R [MA], Riva Self Cure [R], Vidrion R [V], Vitro Fil [VF] and Vitro Molar [VM]. All experiments were carried out by a team of researchers from Brazil and England following strict protocols, under the same laboratory conditions throughout, and maintaining data integrity. Read More

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Comb-like structural modification stabilizes polyvinylidene fluoride membranes to realize thermal-regulated sustainable transportation efficiency.

J Colloid Interface Sci 2021 Jun 4;591:173-183. Epub 2021 Feb 4.

College of Materials Science& Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China. Electronic address:

Hydrophobic micro-porous membrane such as polyvinylidene fluoride (PVDF) with excellent thermal-/chemical-stability and low surface energy has received extensive attention in industrial water treatment and sustainable energy conversion. However, undesirable contaminants caused by inevitable proteins or microorganisms adhesion may lead to a rapid loss of separation efficiency, which significantly deteriorate their porous structures and eventually limit their practical performance. Herein, we present a scalable approach for fabricating comb-like copolymer modified PVDF membranes (PVDF-PN@AgNPs) that prevent bacteria from proliferating on the surface and temperature-controlled release of adhered contaminants. Read More

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Welding fume nanoparticles from solid and flux-cored wires: Solubility, toxicity, and role of fluorides.

J Hazard Mater 2021 Feb 5;413:125273. Epub 2021 Feb 5.

KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, 10044 Stockholm, Sweden; AIMES - Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, Sweden; Department of Neuroscience, Karolinska Institutet, SE-171 77 Stockholm, Sweden. Electronic address:

Welding fume particles are hazardous. Their toxicity likely depends on their composition and reactivity. This study aimed at exploring the role of sodium or other fluorides (NaF), which are intentionally added to flux-cored wire electrodes for stainless steel welding, on the solubility (in phosphate buffered saline) and toxicity of the generated welding fume particles. Read More

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February 2021

The influence of light-curing time on fluoride release, surface topography, and bacterial adhesion in resin-modified glass ionomer cements: AFM and SEM in vitro study.

Microsc Res Tech 2021 Feb 12. Epub 2021 Feb 12.

Benemérita Universidad Autónoma de Puebla, Facultad de Estomatología, Academia de Odontología Pediátrica, Puebla, México.

Reinforced glass ionomer cements have been widely used in pediatric dentistry to prevent dental caries. However, the influence of biomaterial light-curing and its anti-cariogenic effects remain unclear. This study evaluates the influence of the light-curing time on fluoride release, surface topography, and bacterial adhesion in two types of resin-modified glass ionomer cements (RMGICs). Read More

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February 2021

Fluoride release from carbonate-rich fluorapatite during managed aquifer recharge: Model-based development of mitigation strategies.

Water Res 2021 Apr 28;193:116880. Epub 2021 Jan 28.

University of Western Australia, School of Earth Sciences, Crawley WA 6009, Australia; CSIRO Land and Water, Private Bag No. 5, Wembley, WA 6913, Australia; National Centre for Groundwater Research and Training, Adelaide, GPO Box 2100, SA 5001, Australia. Electronic address:

Fluoride-bearing apatite minerals such as fluorapatite (FAP: Ca(PO)F) and related carbonate-rich fluorapatites (CFA: Ca(PO)(CO,F)F), which occur ubiquitously as trace components of rocks and sediments, may act as sources for geogenic groundwater fluoride contamination. CFA dissolution often occurs in conjunction with declining dissolved calcium concentrations. Therefore, managed aquifer recharge (MAR) operations using deionised or low calcium source water are at risk of disturbing the naturally persisting geochemical equilibrium between CFA and the ambient groundwater and induce fluoride mobilisation. Read More

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Public-health risks from tea drinking: Fluoride exposure.

Scand J Public Health 2021 Feb 8:1403494821990284. Epub 2021 Feb 8.

Environmental Medicine, University of Southern Denmark, Denmark.

Aims: Due to new evidence on fluoride neurotoxicity during early life, this study examined maternal exposure to fluoride through tea consumption in a low-fluoride region and measured fluoride releases from commercially available teas (tea bags and loose teas) to determine the need to limit fluoride exposure.

Methods: Maternal urine fluoride (MUF) concentrations were measured in spot urine samples (=118) from first-trimester pregnant women and in prepared tea infusions made with deionised water from 33 brand teas and 57 loose-tea products, as determined by the direct method of using a fluoride-selective electrode.

Results: The fluoride concentration in the local drinking water supplies ranged from 0. Read More

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February 2021

On the Structures of Thorium Fluoride and Oxyfluoride Anions in Molten FLiBe and FLiNaK.

J Phys Chem B 2021 Feb 3;125(6):1640-1646. Epub 2021 Feb 3.

Department of Radiochemistry, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.

The structures of thorium fluoride and oxyfluoride ions in molten FLiBe-ThF and FLiNaK-ThF were investigated by Raman spectroscopy and density functional theory calculations. Thorium fluorides are present in the form of ThF () and ThF () in molten FLiNaK-ThF. Similar speciation was identified in FLiBe-ThF, and the thorium fluoride anions are in equilibrium with free F ions and beryllium fluoride anions, which are responsible for the red shift of the beryllium fluoride bands in the Raman spectra. Read More

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February 2021

Desilylation Induced by Metal Fluoride Nanocrystals Enables Cleavage Chemistry In Vivo.

J Am Chem Soc 2021 Feb 31;143(5):2250-2255. Epub 2021 Jan 31.

Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Metal fluoride nanocrystals are widely used in biomedical studies owing to their unique physicochemical properties. The release of metal ions and fluorides from nanocrystals is intrinsic due to the solubility equilibrium. It used to be considered as a drawback because it is related to the decomposition and defunction of metal fluoride nanocrystals. Read More

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February 2021

Sulfur(VI) Fluoride Exchange (SuFEx)-Mediated Synthesis of the Chitosan-PEG Conjugate and Its Supramolecular Hydrogels for Protein Delivery.

Nanomaterials (Basel) 2021 Jan 27;11(2). Epub 2021 Jan 27.

Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea.

Supramolecular hydrogels are considered promising drug carriers in the tissue engineering field due to their versatile nature. Chitosan hydrogels without chemical cross-linkers have low cytotoxicity and good delivery capacity; however, they have lower mechanical properties for injectable hydrogel usage. In this study, we developed novel chitosan derivatives via click chemistry for fabricating supramolecular hydrogels with higher mechanical strength under mild conditions. Read More

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January 2021

Monte Carlo computation of 3D distributions of stopping power ratios in light ion beam therapy using GATE-RTion.

Med Phys 2021 Jan 19. Epub 2021 Jan 19.

MedAustron Ion Therapy Center, Marie Curie-Straße 5, Wiener Neustadt, A-2700, Austria.

Purpose: This paper presents a novel method for the calculation of three-dimensional (3D) Bragg-Gray water-to-detector stopping power ratio (s ) distributions for proton and carbon ion beams.

Methods: Contrary to previously published fluence-based calculations of the stopping power ratio, the s calculation method used in this work is based on the specific way GATE/Geant4 scores the energy deposition. It only requires the use of the so-called DoseActor, as available in GATE, for the calculation of the s at any point of a 3D dose distribution. Read More

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January 2021

The use of bioactive glass (BAG) in dental composites: A critical review.

Dent Mater 2021 Feb 10;37(2):296-310. Epub 2021 Jan 10.

Queen Mary University of London, Barts & The London School of Medicine and Dentistry, Institute of Dentistry, Centre for Oral Bioengineering, Mile End Road, London E1 4NS, UK.

Objective: In recent years, numerous studies have analyzed the role of bioactive glass (BAG) as remineralizing additives in dental restorative composites. This current review provides a critical analysis of the existing literature, particularly focusing on BAGs prepared via the melt-quench route that form an "apatite-like" phase when immersed in physiological-like solutions.

Methods: Online databases (Science Direct, PubMed and Google Scholar) were used to collect data published from 1962 to 2020. Read More

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February 2021

A latent highly activity energetic fuel: thermal stability and interfacial reaction kinetics of selected fluoropolymer encapsulated sub-micron sized Al particles.

Sci Rep 2021 Jan 12;11(1):738. Epub 2021 Jan 12.

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China.

Aluminum can enhance heat release of energetic composite in theory. However, the commonly used micron aluminum powder has several short comings like incomplete reaction and low reaction rate. Meanwhile, outer oxide shell of nano Al particle is thicker than micro Al, which leads to low active aluminum content and insufficient heat release. Read More

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January 2021

Transparent Glasses and Glass-Ceramics in the Ternary System TeO-NbO-PbF.

Materials (Basel) 2021 Jan 9;14(2). Epub 2021 Jan 9.

Institute of Science and Technology, Federal University of Alfenas, Campus Poços de Caldas, MG CEP, Poços de Caldas 37715-400, Brazil.

Transparent fluorotellurite glasses were prepared by melt-quenching in the ternary system TeO-NbO-PbF. The synthesis conditions were adjusted to minimize fluorine loss monitored as HF release. It was found that 10 mol% of NbO is the optimum content for PbF incorporation up to 35 mol% in the tellurite matrix without loss of glass forming ability. Read More

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January 2021

Fraxetin inhibits interleukin-1β-induced apoptosis, inflammation, and matrix degradation in chondrocytes and protects rat cartilage .

Saudi Pharm J 2020 Dec 25;28(12):1499-1506. Epub 2020 Sep 25.

Department of Traditional Chinese Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China.

Osteoarthritis (OA) is a disease characterized by degeneration of the joint complex due to cartilage destruction. Fraxetin, a widely used and studied coumarin compound extracted from a traditional Chinese herb (Qin Pi), has shown anti-inflammatory and antioxidant properties, but its effects on OA have not been studied. In the present study, western blotting, immunofluorescence, and terminal deoxynucleotidyl transferase (TdT) dUTP nick-end labeling (TUNEL) were used to evaluate the effects of fraxetin on IL-1β-induced apoptotic activity, inflammatory responses, and catabolism in rat chondrocytes. Read More

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December 2020

Synthesis and characterization of hydrocalumite for removal of fluoride from aqueous solutions.

Environ Sci Pollut Res Int 2021 Jan 8. Epub 2021 Jan 8.

Escola de Química - Universidade Federal do Rio de Janeiro (UFRJ), Centro de Tecnologia, Bloco E, sala 206, Rio de Janeiro, RJ, CEP 21941-909, Brazil.

Fluoride can cause some diseases to humans when ingested in large quantities and for a long time. Due to this, it is necessary to remove or reduce the amount of fluoride in effluents before release into the water bodies. This work aimed to evaluate the ability of hydrocalumites synthesized by two different methodologies and calcined hydrocalumite in reducing the content of fluoride in aqueous solutions. Read More

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January 2021

miR-378d is Involved in the Regulation of Apoptosis and Autophagy of and E Secretion from Cultured Ovarian Granular Cells Treated by Sodium Fluoride.

Biol Trace Elem Res 2021 Jan 6. Epub 2021 Jan 6.

Shandong Shenghua Electronic New Materials Co., Ltd., Yantai, Shandong, China.

Taking excessive sodium fluoride may cause female reproductive dysfunction, but underlying molecular mechanism is unclear. The ovarian granulosa cells are the key endocrine cells releasing reproductive hormones. The miRNAs in the granulosa cells play an important function in regulating reproduction. Read More

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January 2021