Relevant bibliographies by topics / Fluoride release

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fluoride release'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Fluoride release"

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Ritwik, P., JD Aubel, X. Xu, Y. Fan, and J. Hagan. "Evaluation of Short Term Fluoride Release from Fluoride Varnishes." Journal of Clinical Pediatric Dentistry 36, no. 3 (April 1, 2012): 275–78. http://dx.doi.org/10.17796/jcpd.36.3.q304488478w52334.

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Objective: The aim of this study was to compare the rate of fluoride release from fluoride varnishes over a 48-hour period and ascertain the time at which a plateau occurred. This data provides clinically relevant time points to resume tooth brushing after fluoride varnish application. Study design: Four commercially available fluoride varnishes, Premier Enamel ProVarnish (EP), Colgate PreviDent (CP), Omni Vanish (OV) and Omni VanishXT (OVXT) were applied on 40 extracted permanent human teeth. Ten teeth served as controls. The teeth were immersed in artificial saliva. At 1,2,4,8,12,24 and 48 hours, the teeth were sequentially transferred to new vials. TISAB III and ion selective electrode was used to measure fluoride release. Statistical tools were used to compare the rates of fluoride release and plateau of fluoride release. Results: CP, EP and OV showed a plateau of fluoride release after 4 hours. OVXT did not show a significant change in fluoride release at any time point. EP had the highest fluoride release in the first 8 hours. Conclusions: CP, EP and OV released maximum rate of fluoride release in the first 4 hours whereas OVXT did not have a plateau. The studied varnishes released different concentrations of fluoride despite the fact that they all contained 5% sodium fluoride.
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Apostolovic, Mirjana, Biljana Kalicanin, Marija Igic, Olivera Trickovic-Janjic, Dusan Surdilovic, Ljiljana Kostadinovic, Branislava Stojkovic, and Dragan Velimirovic. "Migration of fluoride ions from the permanent teeth into saliva in children with glass ionomer cement restorations: An in vitro study." Vojnosanitetski pregled 70, no. 3 (2013): 279–83. http://dx.doi.org/10.2298/vsp1303279a.

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Bacground/Aim. Glass ionomer cements (GIC) belong to the group of polycarboxyl cements, and one of the principal characteristics of these materials is their anticariogenic potential of fluorine release into saliva and enamel-dentin substance. The aim of this study was to examine the content of released fluorine from GIC restorations (Fuji IX, GC, Japan) of young permanent teeth in the medium of artificial saliva and similar releases in the same medium by the restorations of these teeth treated with a low concentration fluoride solution. Methods. We examined 12 premolars exctracted from orthodontic reasons. The GIC restored teeth were divided into the group treated daily with low concentration fluoride solution (334 ppm) and the control, not treated group. The samples of artificial saliva were analyzed for fluorine ion content using an ion selective electrode. Results. Our comparative analysis of the mean values using the Student?s t-test demonstrated a statistically significant difference in fluorine ion concentration in artificial saliva of fluoridated and non-fluoridated teeth with GIC fillings after 14 and 21 days (p < 0.05), while the difference detected after 7 days was with no statistical significance. Conclusion. The results of this in vitro study indicated that low-concentration fluoride solutions could serve to refluoridate GIC fillings and contribute to an increased fluorine content in saliva. The process of refluoridation of GIC fillings should be advised 2-3 weeks after the restoration, since the release of fluorine from GIC fillings diminishes in time.
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Mystkowska, Joanna. "Mechanical and Physicochemical Properties of Tetric EvoCeram® - Dental Composite Material." Solid State Phenomena 147-149 (January 2009): 807–12. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.807.

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This work presents results of research of fluoride release, microhardness and surface roughness and wear of the Tetric EvoCeram material. Wear tests were carried out by means of special tribotester for tooth analysis and by pin-on-disc tribometer. The wear of composite material and counterface (human enamel) were measured. Finally, investigations showed that fluoride ions from commerce material were slightly released. However, the amount of fluoride ions release was depended on pH and temperature of agent solution. Fluorine emission from composite material changed its surface roughness and microhardness. The using method of wear process influenced on friction coefficient value. During friction process the wear layer on composite surface was formed.
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Mystkowska, Joanna, Grażyna Marczuk-Kolada, Katarzyna Leszczyńska, Jan Ryszard Dąbrowski, and Joanna Karaś. "Fluoride Release and Antibacterial Activity of Self-Made Composite Materials for Dental Fillings." Solid State Phenomena 147-149 (January 2009): 801–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.801.

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In the paper own prepared materials with addition fluorine sources were evaluated. The aim of the study was to assess the quality and quantity of fluoride source on fluoride ions release from composite materials. Antibacterial activity of analyzed materials in relation to four bacteria was investigated. Fluoride ions release was measured by direct potentiometry method with fluoride ion selective electrode. The measurements were carried out after 1, 4, 7, 14, 30, 60 days of storage in buffer at pH 6.8. The antibacterial activity of the materials was evaluated against standard bacterial strains using the agar diffusion test. Tests show that the highest level of fluoride ions emission was observed for composite with fluoridated glass (material A) on the seventh day of the study. Similar fluoride ions amount was released from material consisted of fluoridated glass and ytterbium fluoride (material C), but not until on the thirtieth day of the study. After 24 hours of composite bonding there was inhibition of bacterial growth by composite C, whereas composite A did not show similar activity. On the eighth day after polymerization, both materials were significantly more active towards two bacteria.
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Ghani, Sarah H. A., Stephen L. Creanor, John K. Luffingham, and Richard H. Foye. "An Ex Vivo Investigation into the Release of Fluoride from Fluoride-containing Orthodontic Bonding Composites." British Journal of Orthodontics 21, no. 3 (August 1994): 239–43. http://dx.doi.org/10.1179/bjo.21.3.239.

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This study was concerned with an evaluation of fluoride release from commercially available orthodontic bonding composite resins, known as Reliance® and Mirage Dual Cure®, which are claimed to release ionic floride. Forty-eight premolar teeth had brackets bonded with four different composite resins—Mirage Dual Cure®, Reliance®, Right-on® and Heliosit®. They were then immersed in a demineralizing solution. The amount of fluoride released from the composites into the solution was measured. The results indicated that Mirage Dual Curereg; released statistically significant amounts of fluoride over the first 2 days. A similar pattern was noted with Reliance® albeit releasing a lesser amount. From the third day onwards, fluoride release levelled out to concentrations similar to those of the two control materials, Right-on® and Heliosit®(i.e. 0·09 ppm). Fluoride-releasing composite resins, therefore, failed to demonstrate any potential long-term fluoride release within the ex vivo model. Even in the short term, the amount of fluoride released was very small.
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Santos, Rogério Lacerda dos, Matheus Melo Pithon, Júlia Barbosa Pereira Leonardo, Edna Lúcia Couto Oberosler, Delmo Santiago Vaitsman, and Antônio Carlos de Oliveira Ruellas. "Orthodontic cements: immediate protection and fluoride release." Dental Press Journal of Orthodontics 17, no. 4 (August 2012): e1-e5. http://dx.doi.org/10.1590/s2176-94512012000400010.

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OBJECTIVES: The objective of the authors was to evaluate fluoride release of 3 glass ionomer cements with immediate protection of fluoride varnish (Cavitine, SS White), divided into 3 groups: Group M (Meron, VOCO), Group V (Vidrion C, SS White) and Group KC (Ketac-Cem, 3M ESPE). METHODS: Fluoride release was measured during 60 days by means of an ion-selective electrode connected to an ion analyzer. After 4 weeks, the test specimens were exposed to a solution of 0.221% sodium fluoride (1000 ppm of fluoride). RESULTS: Results showed that the cements reached a maximum peak of fluoride release in a period of 24 h. There was a statistically significant difference between the amount of fluoride released after the applications of fluoride among the groups from the 31st to 60th day (p> 0.05). CONCLUSION: The Vidrion C and Meron cements showed better performance to uptake and release fluoride when compared with Ketac-Cem cement.
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Patil, Shruti, Mallikarjun Goud, and Girija Sajjan. "Effect of Short-term Fluoride Release from Various Restorative Cements on Enamel Demineralization: An in vitro Study." International Journal of Prosthodontics and Restorative Dentistry 1, no. 1 (2011): 29–33. http://dx.doi.org/10.5005/jp-journals-10019-1005.

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ABSTRACT Purpose Fluorides are probably the most commonly used anticaries agents. Due to this property they are incorporated into various restorative materials. The rate and amount of fluoride release, however, vary for different materials, which in turn determines the effectiveness of the restorative material in preventing demineralization around the restoration. To evaluate the fluoride release and area of demineralization of resin modified glass ionomers and compomers, and compare them with conventional glass ionomer cement and also to evaluate the relationship between the fluoride release and demineralization. Materials and methods A total of 32 human incisors were chosen and sectioned horizontally at CEJ, and the middle 2 mm of facial enamel isolated and restored with the test materials: Conventional glass ionomer cement (GIC), resin modified glass ionomer cement (RMGIC), compomer and resin composite. The specimens were observed under polarized light microscope with image analyzer to measure the area and depth of demineralization. For fluoride release study, disks of test materials were suspended in deionized water and fluoride release was measured till a period of 4 days. Results The area and depth of demineralization were least around the GIC, followed by RMGIC, compomer and composite (p < 0.05). A negative correlation was found between fluoride release and demineralization which was, however, not statistically significant. Conclusion The 4-day fluoride release was also higher for GIC as compared to RMGIC and Compomer.
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Makkai, Zsigmond Lorand, Melinda Szekely, Zita Fazakas, Levente Mester Nagy, Kinga Matyas Barta, and Bernadette Kerekes Mathe. "Fluoride Release and Uptake Capability of Glass-ionomer Cements and Compomers Used as Dental Restorative Materials." Materiale Plastice 56, no. 3 (September 30, 2019): 548–53. http://dx.doi.org/10.37358/mp.19.3.5227.

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Dental caries and secondary caries are the most common problems in dentistry. Many studies provided evidence for the anticariogenic effect of fluorides. The incidence of secondary caries is decreased in teeth restored with fluoride releasing materials. The purpose of the present in vitro study is to evaluate the fluoride release and uptake capability of two glass-ionomer cements and two compomers. A total number of 60 specimens were prepared according to the manufacturer�s instructions using silicone molds. The specimens were transferred in plastic containers containing artificial saliva (pH=7), incubated at 37�C for 24 h and divided in three subgroups: control group, varnish treated group and dentifrice treated group. The fluoride ion content was measured on five times during a period of 30 days using an Orion 720A fluoride meter with 9609 BN fluoride ion electrode. The self-curing glass-ionomer cement released the highest amounts of fluoride ions at the beginning and after the one month study period. The samples of the four materials tested in the varnish treated groups showed significant differences compared to their control groups on the second day. Dentifrice treated groups did not show significant differences compared to their control groups, except values measured after 30 days. Application of fluoride varnish produced an increase of fluoride release for the first 24 h in case of all materials. However, results suggest that the use of fluoridated dentifrice would be more effective in caries prevention due to their fluoride uptake capability.
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Zhao, Xin Yi, Ya Jie Gui, and Shi Bao Li. "Fluoride Release and Recharge Ability of a Novel Fluoride Release Composite Resin." Advanced Materials Research 833 (November 2013): 355–59. http://dx.doi.org/10.4028/www.scientific.net/amr.833.355.

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Objective: To evaluate the fluoride release rates and fluoride recharge capability of a experimental resin composite, a compomer, a giomer and a resin-modified glass ionomer cement. Methods: Ten disc specimens of each material were prepare and polished with abrasive paper, followed by clearing with oil-free compressed air jet. The specimens were placed in a plastic vessel containing 5ml deionized water immediately after fabrication. Each specimen was removed and put to a new a vessel containing deionized water each day, and the sample solution was test for fluoride concentration each day using a compound fluoride ion selective electrode and a conductivity meter. All specimens were removed from container after 28 days and were recharged by immersing in a fluoride foam solution for four minutes. Then fluoride release from these recharged samples was measured daily for 7 days. Recharge was repeated three times. Result: Fuji II LC demonstrated the highest fluoride release ( p <0.01), followed by experimental resin and Compoglass. Both Beautufil and Charisma presented the lowest fluoride release ( p <0.01) during the first two weeks. All materials except Charisma demonstrated a sharp decline of fluoride release, followed by a comparatively stable stage of fluoride release for about twenty days. All materials presented fluoride release increase substantially one day after recharge but declines rapidly almost to the baseline level after 2 days except for Fuji II LC that showed a continual fluoride release for 5 days. Conclusion: The experimental composite resin has a capability of fluoride release and recharge that are comparable to compomers.
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Toumba, K. J., and M. E. J. Curzon. "Slow-Release Fluoride." Caries Research 27, no. 1 (1993): 43–46. http://dx.doi.org/10.1159/000261601.

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Dissertations / Theses on the topic "Fluoride release"

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Bouvier, Amy. "Fluoride release, recharge, and re-release from four orthodontic bonding systems." Thesis, NSUWorks, 2012. https://nsuworks.nova.edu/hpd_cdm_stuetd/55.

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A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry. Objectives: To determine the amount of initial fluoride release from four orthodontic bonding systems over a period of four weeks, and then to subject these materials to an external source of fluoride for recharge in order to measure the amount of fluoride re-release over another four-week interval. Additionally the surface morphology of these materials was analyzed under the scanning electron microscope in order to identify microscopic changes in the materials that may have occurred during the experiment. Methods: Four orthodontic adhesives: Fuji Ortho LC (GC America, Alsip, IL), Transbond XT (3M Unitek, Monrovia, CA), Illuminate Light Cure (Ortho Organizers, Carlsbad, CA), and Opal Seal with Opal Bond MV (Ultradent, South Jordan, UT), n=120 (30/material) were tested for fluoride release at 1 hour, 24 hours, 3 days, 1 week, 2 weeks, 3 weeks and 4 weeks. Samples (10/subgroup/material) were then recharged with an external source of fluoride (toothpaste, foam, or varnish), and retested for fluoride re-release at 1 hour, 24 hours, 3 days, 1 week, 2 weeks, 3 weeks and 4 weeks. The scanning electron microscope was utilized in order to assess each material's surface morphology before testing and after completion of the experiment (n=16). Descriptive statistics, means and standard deviations were calculated for all four materials and their subgroups at each time interval. A mixed model two-way ANOVA was run, using a level of significance of 0.05. Bonferroni multiple comparison tests were conducted using if groups were found to be statistically significantly different. To determine significant differences between fluoride release and re-release for each recharge subgroup within each material group, paired t-tests were performed for the time intervals of 24 hours, 2 weeks, and 4 weeks. For the paired t-tests, the level of significance used was 0.02 to allow for Bonferroni correction. Results: During the initial 24 hours the fluoride measurements (in mg/L or ppm) were as follows: Fuji 9.78±0.65, Illuminate 7.83±1.49, Opal 0.05±0.02, and Transbond 0.01±0.0. At the initial four weeks time point, the readings were as follows: Fuji 6.68±0.79, Illuminate 3.82±1.84, Opal 0.06±0.01, and Transbond 0.01±0.01. The greatest fluoride release came from the varnish subgroups from each of the materials at 2 weeks post re-charge: Fuji 9.16±1.53, Illuminate 7.5±3.1 (tied with foam subgroup 7.5±4.4), Opal 5.3±2.45, and Transbond 3.75±1.67. The greatest fluoride measurement for each material at the final week post-recharge was: Fuji varnish subgroup 8.3±3.58, Illuminate foam subgroup 6.5±3.5, Opal varnish subgroup 2.50±1.1, and Transbond varnish subgroup 1.72±1.82. SEM results showed an observable difference between the materials pre-experiment and post-experiment at a magnification of 50X and 500X. The Fuji foam and paste subgroups displayed surface crackling patterns at both magnifications when compared to the control and varnish samples. The Illuminate control, foam, and paste specimens all had a roughened grainy appearance, while the varnish specimen seemed to be smoothed over by the varnish material. The Transbond samples appeared to have observable differences in surface morphology at 50X, but not at 500X. The Opal paste and foam specimens appeared to have a smoother surface than both the control and the varnish samples. Conclusions: There were significant differences in release and re-release of fluoride among all four adhesives at different time intervals over a period of eight weeks. Significant increase in fluoride re-release was seen for all three of the recharge subgroups for both Opal and Transbond at each time interval. A significant increase in fluoride re-release for the Illuminate group was mainly observed at the end of second and fourth week. Though no significant increase in fluoride re-release was observed, Fuji released highest amount of fluoride during release and re-release, at all different time intervals. Fluoride varnish was the superior recharge material, as it provided the greatest fluoride measurements, followed by foam and toothpaste. There were observable changes in the surface morphology of the materials pre-experiment and post-experiment at a magnification of 50X and 500X, which may have an affect on the fluoride releasing capabilities of the materials.
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McNeill, Cynthia Jane. "Fluoride release from light-cured orthodontic bonding materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0028/MQ51767.pdf.

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Wheeler, Arthur. "Comparison of fluoride release protocols for RMGIC/PMCR adhesives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ58099.pdf.

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Abudiak, Hani. "Effect of fluoride sustained slow-release devices on fluoride, phosphate and calcum levels in plaque biofilms." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446094.

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Malik-Kotru, Gayatri. "Laboratory and clinical studies using the slow release fluoride device." Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522972.

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Owens, Tim Sadley. "Development and Evaluation of Extended Release Bioadhesive Sodium Fluoride Tablets." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100715863.

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Khan, Shadeed. "Controlled Release of Fluoride from Poly(ethylene-co-vinyl acetate) Films." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1928.

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The development of aesthetically unattractive white spots is a concern for patients undergoing fixed orthodontic treatment. Due to poor oral hygiene during treatment, accumulation of plaque around orthodontic brackets causes bacterial fermentation reactions producing acids that dissolve the mineral enamel. Such dissolution results in white spot formation, an early sign of dental caries. In principal, to inhibit the appearance of these spots during treatment, fluoridated elastomeric o-rings might be employed. Once placed around brackets, these o-rings should release fluoride therapeutically for at least 30 days, after which the orthodontist may replace them. At the present time, such fluoride-releasing o-rings are not available. In this study, model materials for fluoride-releasing elastomeric o-rings were developed. These materials were fluoride-impregnated poly(ethylene-co-vinyl acetate) (PEVA) films. In vitro release studies of these films were conducted, assessing their capacity to deliver fluoride within therapeutic range (1.2 ≤ µg F/ring/day ≤ 51.4) for 30-45 days. Optimal sample and experimental parameters, including (1) fluoride loading in the film (wt% F), (2) overcoat thickness, and (3) temperature that provided therapeutic release, were determined. At 37°C, favorable release was observed for the following: (1) films with overcoat thickness of 0.14 mm and fluoride loadings of 3.9 wt% and 5.7 wt% and (2) films with overcoat thickness of 0.27 mm and fluoride loading of 5.7 wt%. These results are important in providing fundamental guidance for the development of o-rings that combat white spot formation among orthodontic patients.
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Rix, Douglas. "Bond strengths and fluoride release of modified glass ionomer and resin adhesives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ39873.pdf.

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Lam, Wiley T. C. "In vitro evaluation of fluoride release and artificial caries formation with selected glass polyalkenoate cements." [Hong Kong] : Faculty of Dentistry, The University of Hong Kong, 1996. http://sunzi.lib.hku.hk/HKUTO/record/B3862817X.

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林德昭 and Wiley T. C. Lam. "In vitro evaluation of fluoride release and artificial caries formation with selected glass polyalkenoate cements." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B3862817X.

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Books on the topic "Fluoride release"

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Nouri, Mohammad-Reza. Glass ionomer compounds: Chemistry, biocompatibility, adhesion, fluoride release, and mechanical properties : a literature review. [Toronto: University of Toronto, Faculty of Dentistry], 1997.

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Larochelle, Elaine. Comparative "in vitro" study of chemical properties of cavity liners: PH level, calcium and fluoride release measurements. [Toronto: Faculty of Dentistry, University of Toronto], 1989.

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Board, United States National Transportation Safety. Hazardous materials accident report: Anhydrous hydrogen fluoride release from NATX 9408, train no. BNEL3Y at Conrail's receiving yard, Elkhart, Indiana, February 4, 1985. Washington, D.C: The Board, 1986.

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United States. National Transportation Safety Board. Hazardous materials accident report: Anhydrous hydrogen fluoride release from NATX 9408, train no. BNEL3Y at Conrail's receiving yard, Elkhart, Indiana, February 4, 1985. Washington, D.C: The Board, 1986.

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), Ad Hoc Interagency Public Health Assessment Task Force (U S. Assessment of the public health impact from the accidental release of UFb6s at the Sequoyah Fuels Corporation facility at Gore, Oklahoma: Docket no. 40-8027, license no. SUB-1010. Washington, D.C: U.S. Nuclear Regulatory Commission, 1986.

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Davis, Daniel S. Prevention reference manual: User's guide overview for controlling accidental releases of air toxics. Research Triangle Park, NC: Air and Energy Engineering Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1987.

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Davis, Daniel S. Prevention reference manual: User's guide overview for controlling accidental releases of air toxics. Research Triangle Park, NC: Air and Energy Engineering Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1987.

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Davis, Daniel S. Prevention reference manual: Chemical specific, volume 6 : control of accidental releases of carbon tetrachloride (SCAQMD). Research Triangle Park, NC: U.S. Environmental Protection Agency, Air and Energy Engineering Research Laboratory, 1988.

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Revuelta, Regina. The effect of cholesterol esterase on fluoride release and biostability of compomers: An in vitro study. 2006.

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Book chapters on the topic "Fluoride release"

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Farooqi, Abida. "Mechanism of Arsenic and Fluoride Release: A Case Study from Lahore and Kasur, Punjab Pakistan." In Arsenic and Fluoride Contamination, 35–60. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2298-9_3.

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Mystkowska, Joanna. "Fluoride Release from Composite Materials for Dental Fillings." In Solid State Phenomena, 27–32. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-60-4.27.

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Cachero, M. T. G., A. Rocher, R. J. Rigual, and C. Gonzalez. "Activation of GTP-Binding Proteins by Aluminum Fluoride Modulates Catecholamine Release in the Rabbit Carotid Body." In Advances in Experimental Medicine and Biology, 205–8. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2572-1_29.

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Ebnesajjad, Sina. "Release Film Applications." In Polyvinyl Fluoride, 265–74. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4557-7885-0.00011-9.

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"Appendix G: Scenario 7: Transient (Mitigated) Area-Source Release of Hydrogen Fluoride." In Guidelines for Use of Vapor Cloud Dispersion Models, 243–57. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470935071.app7.

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Sahay, Neeta, and Subrata Chattopadhyay. "Characteristic Behavior of PVDF-Compliant Structure as an End Effector Using Creo Element/Pro Release 5.0." In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 203–12. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2584-5.ch012.

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The tremendous area of application of microprocessors and microcontrollers has exhausted the demand for polymers as sensors among the fastest growing technologies of the $18 billion sensor market worldwide. This chapter presents the study of characteristic behavior of a compliance structure made of PVDF (Poly Vinylidene Fluoride) material which is acting as an actuator and sensor, too. The inverse piezoelectric nature of PVDF has been used to produce the required amount of force by applying the voltage at a specific point at the base of the structure which is generating the opening and closing of the end effector. The displacement of the tip of the end effector can be sensed by generated voltage of piezoelectric effect of PVDF.
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Soares Tenório, Jorge Alberto, and Denise Crocce Romano Espinosa. "Recycling of Aluminum." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000433.

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Aluminum is the second most used metal in the world because of its properties including good corrosion resistance, low density, high electrical conductivity and good thermal conductivity. However, the negative environmental impact from production of primary aluminum is due to the corresponding impact of red mud and release of fluorides which is devastating to forests and the space required for waste disposal. Recycling, in addition to reducing the impact of disposal of the by-products of primary aluminum production also consumes a great amount of electricity. Therefore, recycling of aluminum scrap is of increasing interest. In this article, the following factors involved in aluminum recycling are discussed: environmental and energy impact, secondary metallurgy of aluminum, fundamentals of aluminum recovery using salt flux, recovery of aluminum drosses by milling and preliminary treatments of scrap.
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"Dual role of serine hydroxymethyltransferase in the synergy of fluorouracil and leucovorin: effects of L-serine and glycine on H4PteGlu/5,10-CH2-H4PteGlu ratios; and H4PteGlu-catalyzed release of fluoride ion from alpha-fluoro-beta alanine." In Zurich, Switzerland, September 3–8, 1989, 811–16. De Gruyter, 1990. http://dx.doi.org/10.1515/9783110889000-154.

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Sposito, Garrison. "Mineral Weathering." In The Chemistry of Soils. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190630881.003.0009.

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Mineral weathering begins with mineral dissolution, typically as induced by protons or by ligands that form strong complexes with metals (Section 1.4). Proton-induced dissolution begins with H+ adsorption, exemplified in Eq. 3.2 for a metal oxyhydroxide mineral. In the absence of ligands that could replace the positively charged water molecule resulting from this rapid reaction, proton adsorption is followed by slow detachment of the metal, which then equilibrates as a soluble species in the soil solution, as illustrated in Fig. 5.1 (pathway 1) for gibbsite [Al(OH)3; see Fig. 2.7] at a pH value low enough that the detached Al3+ does not hydrolyze. Ligand-induced dissolution is also illustrated in Fig. 5.1 (pathway 2). The ligand is a fluoride anion, which forms a strong complex with Al3+ (see problem 3 in Chapter 4). Adsorption in this case occurs by ligand exchange, which is illustrated for carboxylate in Eq. 3.3. A similar reaction occurs for F-:...Slow detachment of the AlF2+ complex then follows. Whenever a mineral dissolution reaction induced by either of these two-step mechanisms is far from equilibrium, it is not influenced by the very low concentration of the constituent released from the dissolving mineral and its rate can be described by zero-order kinetics (Table 4.2). Accordingly, if [A] is the concentration of a constituent released, then the rate law can be expressed as...where kd is a rate coefficient independent of [A] , but a function of temperature, pressure, pH, the chemical properties of the mineral, and, if appropriate, the concentration of the ligand inducing dissolution via the second mechanism in Fig. 5.1. The mineral dissolution rate on the left side of Eq. 5.2 can be mass-normalized to express it in moles per mole of mineral per second by dividing the molar concentration [A] with the solids concentration of the mineral expressed in units of moles per liter. This mass-normalized rate does not depend on the amount of mineral dissolving. For proton-induced dissolution, the rate is then a function of temperature, pressure, pH, and the chemical nature of the mineral.
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Conference papers on the topic "Fluoride release"

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Geraldine, Karen, Dhea Putriani, Heri Hermansyah, and Yosi K. Eriwati. "Optimization of fluoride release by addition of flavor oils in fast release fluoride varnish." In THE 5TH BIOMEDICAL ENGINEERING’S RECENT PROGRESS IN BIOMATERIALS, DRUGS DEVELOPMENT, AND MEDICAL DEVICES: Proceedings of the 5th International Symposium of Biomedical Engineering (ISBE) 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047198.

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Ziraps, Valters, Peteris Kulis, and Ivars Tale. "Ion and electron trapping: release and relaxation processes in fluoride crystals." In Advanced Optical Materials and Devices, edited by Steponas P. Asmontas and Jonas Gradauskas. SPIE, 2001. http://dx.doi.org/10.1117/12.425502.

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Geraldine, Karen, Dhea Putriani, Yosi K. Eriwati, and Heri Hermansyah. "Modification of fast release fluoride varnish by addition of plant-based extracts as antibacterial agents." In THE 5TH BIOMEDICAL ENGINEERING’S RECENT PROGRESS IN BIOMATERIALS, DRUGS DEVELOPMENT, AND MEDICAL DEVICES: Proceedings of the 5th International Symposium of Biomedical Engineering (ISBE) 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047551.

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Kienast, J., J. Arnout, G. Pfliegler, H. Deckmyn, B. Hoet, and J. Vermylen. "DISSOCIATION OF PHOSPHOLIPASE A2 ACTIVATION FROM CYTOSOLIC FREE CA2+ MOBILIZATION IN PLATELETS EXPOSED TO FLUORIDE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644529.

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Elevated cytosolic free Ca2+ concentrations ([Ca2+]i) are thought to be required for phosphol ipase A2 activity to liberate arachidonic acid (AA) from membrane phospholipids in platelets. The major AA metabolite formed during agonist-induced platelet activation is thromboxane A2 (TxA2). We have investigated the effect of sodium fluoride (NaF) on platelet TxAz formation in correlation to platelet functional changes (aggregation and release of ATP) and intracellular events specific for either agonist- or antagonist-induced platelet responses. A first peak in platelet TxAffi formation reaching 30 × control values was observed at 20 - 30 mM of NaF which also induced platelet aggregation and release of ATP in association with a rise in [Ca2+]i . Increasing the concentration of NaF resulted in a decrease in TxA2 release to a minimum of 12 × control values at 50 mM. A second, concentration-dependent rise in TxA2 formation was observed at higher concentrations of NaF with a maximum of 40 × control values at 100 mM. These concentrations, however, did induce neither aggregation nor a significant rise in [Ca2+]i but a rapid, transient increase in platelet cAMP levels. Activation of phospholipase C and protein kinase C was observed at all concentrations of NaF tested whereby the rate rather than the extent of activation of these enzymes was concentration-dependent. Our results demonstrate that fluoride at high concentrations can induce platelet TxA2 formation in the absence of elevated [Ca2+]i suggesting an additional, Ca2+-independent mechanism of phospholipase A2 activation possibly mediated by fluoride sensitive GTP-binding regulatory proteins.
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Kienast, J., J. Arnout, G. Pfliegler, H. Deckmyn, E. Van Houtte, and J. Vermylen. "DUAL EFFECT OF FLUORIDE ON ENDOTHELIAL PROSTACYCLIN PRODUCTION." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643377.

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The effects of fluoride at mM concentrations on prostacyclin (PGI2) production by human umbilical vein endothelial cells in culture were investigated. At lower concentrations, with a peak activity around 20-30 mM, sodium fluoride (NaF) caused a slow rise in PGI2 release reaching a maximum of 6 to 8 × control values after 1 hour. With increasing concentrations, the NaF-induced PGI2 production progressively decreased to almost control levels at 100 mM. Preincubation of the cells with 100 mM NaF inhibited thrombin— and A23187-stimulated PGI2 production by 46 % and 64 % respectively. The response to NaF was not significantly enhanced by AlCl3 nor was it inhibited by pertussis toxin.The dual, stimulatory and inhibitory, effect of NaF on endothelial PGI2 production as well as its slow mode of action resemble the stimulus-response pattern observed in platelets upon exposure to NaF as it has previously been described by our grcup. Therefore, NaF might be an interesting tool for the investigation of intracellular regulatory processes triggering endothelial PGI2 production, particularly in view of the known capacity of fluoride to activate guanine nucleotide—binding regulatory proteins.
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Zhang, Sheng, Xiao Wu, and Xiaodong Sun. "Numerical Study of Tritium Mitigation Strategies for Fluoride Salt-Cooled High-Temperature Reactors." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16379.

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Abstract Fluoride salt-cooled High-temperature Reactor (FHR) is one of the advanced non-Light Water Reactor (non-LWR) designs, which adopts a low-pressure fluoride salt as the primary coolant, high working temperatures, coated-particle fuel, and a passive safety system for decay heat removal. However, tritium management is perceived as a critical issue for FHRs since tritium is a radiation hazard when inhaled or ingested and its production rate in FHRs is expected to be significantly higher compared to that in LWRs. To reduce FHR tritium release rates into the ambient, two tritium mitigation options, such as using Double-Wall Fluted-Tube Heat eXchangers (DWFT-HXs) with a tritium carrier or Single-Wall Fluted-Tube HXs (SWFT-HXs) with a tritium barrier, are therefore proposed for key HXs in FHRs, which potentially provide major pathways for tritium release due to their elevated temperatures and large surface areas. Tritium carriers investigated include gases, such as helium, and liquids, such as FLiBe, FLiNaK, and KF-ZrF4, while the tritium barrier investigated in this paper is silicon carbide (SiC) due to its low permeability for tritium. These proposed HX designs are then optimized, using a Non-dominated Sorting in Generic Algorithms (NSGA) optimization approach, for the Advanced High-Temperature Reactor (AHTR), one of the FHR designs with a large power output. A system-level mass transfer model is developed to evaluate the tritium transport in the two proposed design options for tritium mitigation in FHRs and quantitively analyze the tritium release/leakage rate from the reactor primary system. Our study shows that both the DWFT-HX design with helium as the tritium carrier and SWFT-HX design with SiC coating as the tritium barrier are able to reduce the total tritium leakage rate in FHRs to the same order of magnitude of the typical average tritium leakage rate in LWRs (1.9 Ci/day).
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Kato, Takahiro, Kenji Murakami, and Katsuyasu Sugawra. "Release Behavior of Fluorine during Heat Treatment of Steel Dusts." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_376.

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Zhang, Sheng, Shanbin Shi, Xiao Wu, Xiaodong Sun, and Richard Christensen. "Double-Wall Natural Draft Heat Exchanger Design for Tritium Control in FHRs." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67844.

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Tritium control is potentially a critical issue for Fluoride salt-cooled High-temperature Reactors (FHRs) and Molten Salt Reactors (MSRs). Tritium production rate in these reactors can be significantly higher compared to that in Light Water Reactors (LWRs). Tritium is highly permeable at high temperatures through reactor structures, especially. Therefore, heat exchangers with large heat transfer areas in FHRs and MSRs provide practical paths for the tritium generated in the primary salt migrating into the surroundings, such as Natural Draft Heat Exchangers (NDHXs) in the direct reactor auxiliary cooling system (DRACS), which are proposed as a passive decay heat removal system for these reactors. A double-wall heat exchanger design was proposed in the literature to significantly minimize the tritium release rate to the environment in FHRs. This unique shell and tube heat exchanger design adopts a three-fluid design concept and each of the heat exchanger tube consists of an inner tube and an outer tube. Each of these tube units forms three flow passages, i.e., the inner channel, annular channel, and outer channel. While this type of heat exchangers was proposed, few such heat exchangers have been designed in the literature, taking into account both heat and tritium mass transfer performance. In this study, a one-dimensional heat and mass transfer model was developed to assist the design of a double-wall NDHX for FHRs. In this model, the molten salt and air flow through the inner and outer channels, respectively. A selected sweep gas acting as a tritium removal medium flows in the annular channel and takes tritium away to minimize tritium leakage to the air flowing in the outer channel. The heat transfer model was benchmarked against a Computational Fluid Dynamics (CFD) code, i.e., ANSYS Fluent. Good agreement was obtained between the model simulation and Fluent analysis. In addition, the heat and mass transfer models combined with non-dominated sorting in generic algorithms (NSGA) were applied to investigate a potential NDHX design in Advanced High-Temperature Reactor (AHTR), a pre-conceptual FHR design developed by the Oak Ridge National Laboratory. A double-wall NDHX design using inner and outer fluted tubes was therefore optimized and compared with a single-wall design in terms of performance and economics.
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Popat, Ajay M., and Chad B. O’Neal. "Process Optimization for Releasing of MEMS/NEMS Devices and Coating of Anti-Stiction SAM." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43820.

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Micro electromechanical systems (MEMS) or nano electromechanical systems (NEMS) have higher surface-to-volume ratio, and hence they are susceptible to unintentional adhesion and subsequent failure to function. Although there are many classes of liquid phase anti-stiction coatings for silicon MEMS / NEMS, alkene based monolayer films with hydrogen terminated silicon coatings were chosen since this process has some important advantages over other SAM processes, such as fluorine or chlorine based films. An engineering challenge of scaling up liquid-phase anti-stiction and release processes is met by designing and fabricating a semi-automated and portable MEMS release station, which enables 20 – 40 dice or a wafer up to 100 mm in diameter to be released and coated at one time. This optimized release and coating process reduces processing time and chemical processing volume drastically compared to releasing and coating dice individually. The simultaneous processing of multiple dice was enabled through an inert FEP - Teflon dice-holder-clamp. The clamp is adaptable to hold varied sizes of dice with no lost die. The successful elimination of the secondary HF rinse for hydrogen termination has resulted in additional saving of expensive HF, additional saving of process time, and reduced exposure to the dangerous chemical - HF. The increase in hydrophobicity resulted from the optimized release and SAM coating process was confirmed through the average increase, from 68.2° to 109.3°, in water contact angle of SAM coated Si (100). The increase in the average surface roughness from 0.4 nm for source procedure to ∼ 4 nm using optimized release and SAM coating process became evident through the AFM scanned images. The increase in hydrophobicity and surface roughness using the optimized release and SAM coating process play vital roles in preventing the stiction of MEMS / NEMS devices. This scalable process has good yield and is easier to use and train personnel than a typical SAM coating process.
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Xiujuan, Liang, Xiao Changlai, Feng Bo, Du Chao, Fang Zhang, Deng Songlin, and Xu Xiaoling. "Experiment on Dynamic Release of Fluorine from Sediment in Yangshapao Reservoir of Western Jilin Province." In 2009 International Conference on Environmental Science and Information Application Technology, ESIAT. IEEE, 2009. http://dx.doi.org/10.1109/esiat.2009.66.

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Reports on the topic "Fluoride release"

1

Neff, D. Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5646168.

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Holve, D., and T. Harvill. Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5608942.

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Author, Not Given. Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5139254.

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Author, Not Given. Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5139284.

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Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5609153.

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Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5548924.

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Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5609113.

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Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5674978.

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Effectiveness of water spray mitigation systems for accidental releases of hydrogen fluoride. Office of Scientific and Technical Information (OSTI), June 1989. http://dx.doi.org/10.2172/5548961.

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