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Search Results: 1 - 10 of 93 matches for " fluorides "
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Fluoride and aluminum release from restorative materials using ion chromatography
Okte, Zeynep;Bayrak, Sule;Fidanci, Ulvi Reha;Sel, Tevhide;
Journal of Applied Oral Science , 2012, DOI: 10.1590/S1678-77572012000100006
Abstract: objective: the aim of this study was to determine the amounts of fluoride and aluminum released from different restorative materials stored in artificial saliva and double-distilled water. material and methods: cylindrical specimens (10 x 1 mm) were prepared from 4 different restorative materials (kavitan plus, vitremer, dyract extra, and surefil). for each material, 20 specimens were prepared, 10 of which were stored in 5 ml artificial saliva and 10 of which were stored in 5 ml of double-distilled water. concentrations of fluoride and aluminum in the solutions were measured using ion chromatography. measurements were taken daily for one week and then weekly for two additional weeks. data were analyzed using two-way anova and duncan's multiple range tests (p<0.05). results: the highest amounts of both fluoride and aluminum were released by the resin-modified glass ionomer cement vitremer in double-distilled water (p<0.05). all materials released significantly more fluoride in double-distilled water than in artificial saliva (p<0.05). in artificial saliva, none of the materials were observed to release aluminum. conclusion: it was concluded that storage media and method of analysis should be taken into account when the fluoride and aluminum release from dental materials is assessed.
Prevalence and severity of dental fluorosis among students from Jo?o Pessoa, PB, Brazil
Carvalho, Thiago Saads;Kehrle, Helen Moura;Sampaio, Fábio Correia;
Brazilian Oral Research , 2007, DOI: 10.1590/S1806-83242007000300002
Abstract: the aim of this study was to determine the prevalence and severity of dental fluorosis among 12-15-year-old students from jo?o pessoa, pb, brazil before starting a program of artificial fluoridation of drinking water. the use of fluoridated dentifrice was also surveyed. a sample of 1,402 students was randomly selected. however, 31 students refused to participate and 257 were not permanent residents in jo?o pessoa, thus leaving a final sample of 1,114 students. clinical exams were carried out by two calibrated dentists (kappa = 0.78) under natural indirect light. upper and lower front teeth were cleaned with gauze and dried, and then examined using the tf index for fluorosis. a questionnaire on dentifrice ingestion and oral hygiene habits was applied to the students. the results revealed that fluorosis prevalence in this age group was higher than expected (29.2%). most fluorosis cases were tf = 1 (66.8%), and the most severe cases were tf = 4 (2.2%). the majority of the students reported that they had been using fluoridated dentifrices since childhood; 95% of the participants preferred brands with a 1,500 ppm f concentration, and 40% remembered that they usually ingested or still ingest dentifrice during brushing. it was concluded that dental fluorosis prevalence among students in jo?o pessoa is higher than expected for an area with non-fluoridated water. however, although most students use fluoridated dentifrices, and almost half ingest slurry while brushing, the majority of cases had little aesthetic relevance from the professionals' point of view, thus suggesting that fluorosis is not a public health problem in the locality.
Evaluation of the fluoride stability of dentifrices sold in Manaus, AM, Brazil
Conde, Nikeila Chacon de Oliveira;Rebelo, Maria Augusta Bessa;Cury, Jaime Aparecido;
Pesquisa Odontológica Brasileira , 2003, DOI: 10.1590/S1517-74912003000300009
Abstract: the minimum requirement for the anti-caries effect of a dentifrice is the presence of available and stable fluoride in the formulation. the concentration of available fluoride in the major dentifrices sold in brazil has been reported, but few data have been published about its stability, which is temperature-dependent. thus, the aim of this study was to evaluate the concentration and stability of fluoride in dentifrices sold in manaus, am, brazil, which is a typical tropical city. the concentrations of total fluoride, total soluble fluoride, mfp, and of insoluble fluoride of six brazilian dentifrices and an imported one were analyzed. the analyses were made when the dentifrices were purchased and during a year of storage at room temperature (28.9 ± 1.16°c) and under refrigeration (26.3 ± 0.88°c). the analyses were performed using an ion specific electrode orion 96-09. at the time of purchase, all the dentifrices analyzed showed more than 1,000 ppm (mg f-/g; w/w) of soluble fluoride. however, in most of them, this form of fluoride was not shown to be stable. the highest loss of soluble fluoride was found for storage at room temperature, reaching up to 40%. although all dentifrices comply with the brazilian guidelines with regard to the concentration of total fluoride (maximum of 0.15%), the instability of soluble fluoride observed in some of them can impair their anti-caries effect and this condition is not contemplated in the governmental rules.
In vivo and in vitro studies of a cetylamine fluoride mouthrinse: evaluation of a device used for in vitro experiments
CARVALHO, Sílvia Magaly Sasso;POLIZELLO, Ana Cristina M.;LEIT?O, Denise Pimenta da Silva;SPADARO, Augusto César Cropanese;
Revista de Odontologia da Universidade de S?o Paulo , 1999, DOI: 10.1590/S0103-06631999000300006
Abstract: a mouthrinse containing cetylamine fluoride (230 ppm in fluoride) was prepared for in vitro studies of fluoride clearance and adsorption by enamel and/or hydroxyapatite using a device that simulates the oral cavity. in vivo studies of fluoride clearance from this mouthrinse were conducted and compared with other fluoride sources. the amount of fluoride adsorbed to tooth blocks or powdered hydroxyapatite, both treated with this cetylamine fluoride mouthrinse once or twice a day, was determined. the results of these studies showed that it is possible to prepare a mouthrinse with cetylamine fluoride for alternative use by patients for the prevention and therapy of dental caries.
Evaluation of the fluoride stability of dentifrices sold in Manaus, AM, Brazil
Conde Nikeila Chacon de Oliveira,Rebelo Maria Augusta Bessa,Cury Jaime Aparecido
Pesquisa Odontológica Brasileira , 2003,
Abstract: The minimum requirement for the anti-caries effect of a dentifrice is the presence of available and stable fluoride in the formulation. The concentration of available fluoride in the major dentifrices sold in Brazil has been reported, but few data have been published about its stability, which is temperature-dependent. Thus, the aim of this study was to evaluate the concentration and stability of fluoride in dentifrices sold in Manaus, AM, Brazil, which is a typical tropical city. The concentrations of total fluoride, total soluble fluoride, MFP, and of insoluble fluoride of six Brazilian dentifrices and an imported one were analyzed. The analyses were made when the dentifrices were purchased and during a year of storage at room temperature (28.9 ± 1.16°C) and under refrigeration (26.3 ± 0.88°C). The analyses were performed using an ion specific electrode Orion 96-09. At the time of purchase, all the dentifrices analyzed showed more than 1,000 ppm (mug F-/g; w/w) of soluble fluoride. However, in most of them, this form of fluoride was not shown to be stable. The highest loss of soluble fluoride was found for storage at room temperature, reaching up to 40%. Although all dentifrices comply with the Brazilian guidelines with regard to the concentration of total fluoride (maximum of 0.15%), the instability of soluble fluoride observed in some of them can impair their anti-caries effect and this condition is not contemplated in the Governmental rules.
Beverage Consumption by 0-3 Year-Old Children and its Relation with Dental Fluorosis Severity
Loliza Chalub Luiz FIGUEIREDO,Carolina de Castro MARTINS,Nircinara Reis PINHEIRO,Saul Martins de PAIVA
Pesquisa Brasileira em Odontopediatria e Clínica Integrada , 2006,
Abstract: Objective: To evaluate the beverage ingested by children between 0 and 3 years old and their relation to the different degrees of dental fluorosis. Method: Four hundred and twenty nine children, between 6 and 12 years old, from Levindo Lopes Municipal School in Belo Horizonte-MG (0.74 ppm F) have been submited to clinical examination. One hundred and thirty four children were diagnosed as having dental fluorosis in grades varying from questionable to moderate. The parents of these children answered a questionnaire about milk, teas and juices ingestion by them when they were between 0 and 3 years old. For statistical analysis it was used the SPSS 9.0.0 program and Fisher's exact test (p≤0.05). Results: It was noted that the ingestion of maternal milk, bovine milk, juices and teas by children between 0 and 3 years old was common, although none of these factors has had significant association with the degrees of dental fluorosis. Conclusion: The highest frequency of juices ingestion was significantly associated with highest degrees of dental fluorosis (p=0.046). Parents should be informed about the role of industrialized beverages in the ingestion of fluorides.
In vivo and in vitro studies of a cetylamine fluoride mouthrinse: evaluation of a device used for in vitro experiments
CARVALHO Sílvia Magaly Sasso,POLIZELLO Ana Cristina M.,LEIT?O Denise Pimenta da Silva,SPADARO Augusto César Cropanese
Revista de Odontologia da Universidade de S?o Paulo , 1999,
Abstract: A mouthrinse containing cetylamine fluoride (230 ppm in fluoride) was prepared for in vitro studies of fluoride clearance and adsorption by enamel and/or hydroxyapatite using a device that simulates the oral cavity. In vivo studies of fluoride clearance from this mouthrinse were conducted and compared with other fluoride sources. The amount of fluoride adsorbed to tooth blocks or powdered hydroxyapatite, both treated with this cetylamine fluoride mouthrinse once or twice a day, was determined. The results of these studies showed that it is possible to prepare a mouthrinse with cetylamine fluoride for alternative use by patients for the prevention and therapy of dental caries.
Fluoride Concentration in Potable Groundwater in Rural Areas of Khaf City, Razavi Khorasan Province, Northeastern Iran
AI Amouei,AH Mahvi,AA Mohammadi,HA Asgharnia
International Journal of Occupational and Environmental Medicine , 2012,
Abstract: Long-term exposure to high concentrations of fluoride is associated with several adverse effects on human including dental and skeletal fluorosis. We studied all the groundwater wells located in rural areas of Khaf city, Razavi Province, northeastern Iran between 2009 and 2010. Fluoride concentration of water samples was measured by SPADNS method. We found that in rural areas the fluoride concentration ranged from 0.11 to 3.59 ppm—the level was less than the permissible limit in 31% of studied samples, higher than the permissible limit in 4% of the samples, and within the optimum limit of 1 to 1.5 ppm in 65% of water samples.
Effect of fluorides from various restorative materials on remineralization of adjacent tooth: An in vitro study
Baliga M,Bhat S
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2010,
Abstract: The aim of the study was to evaluate the extent of surface zone remineralization and the effect of fluoride at the inter-proximal adjacent tooth surface, using restorative materials FusionAlloy, Ketac-Fil and Heliomolar. Ninety extracted molar teeth were used of which 45 were placed in artificial caries for 10 weeks. The remaining 45 teeth were filled with the respective restorative materials, mounted with the artificial carious teeth in proximal contact with plaster and placed in artificial saliva for a period of 28 days. Finally, sectioning of artificially carious teeth was done mesio-distally and observed under the optical microscope and scanning electron microscope. Comparison among the groups was done by one-way analysis of variance [ANOVA] and Fischer′s F test. Intercomparison between the groups was done by using Dunnett′s t-test. Results obtained from transmitted electron microscopic and scanning electron microscopic observations were almost similar with the Ketac-Fil and Heliomolar showing better results in surface zone remineralization compared to FusionAlloy. Also, Ketac-Fil is a good material in releasing fluoride to remineralize enamel when compared to Heliomolar and FusionAlloy. Thus, it can be used mainly in class II cavity restorations of primary and permanent dentitions due to the potential ability of fluoride containing glass ionomer cements and composite resins to remineralize incipient carious lesions on adjacent teeth.
Analysis of Health Risk Due to the Presence of Radioactivity and Chemical Elements in Groundwater, Aldama Municipality, Chihuahua, Mexico  [PDF]
Lourdes Villalba, Luis Colmenero-Sujo, Adan Pinales-Munguia, Guadalupe Estrada-Gutiérrez, Héctor Rubio-Arias, Fernando Mireles-Garcia, Ignacio Dávila-Rangel
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.411147
Abstract:

There exist potential health risks due to the presence of some elements in groundwater. This study presents measurements of gross alpha and beta activity and chemical concentrations (fluorides and nitrates) in 25 water wells in Aldama municipality, Chihuahua, Mexico. Total alpha and beta emitter analyses were performed at the Academic Unit of Nuclear Studies at the Autonomous University of Zacatecas. Radioactive elements were concentrated by total evaporation. All samples were measured with a Wallac-Oy 1411 liquid scintillate with a pulse separation option (Pulse Shape Analysis) for 6 h. Fluorine and nitrate analyses were performed at the Faculty of Engineering of the Autonomous University of Chihuahua by flow injection-hydride generation collection-atomic absorption spectrometry. Exposure levels were calculated for each well and found to exceed maximum limits allowed under Mexican law in terms of 1) gross alpha and beta activity; and 2) fluoride and nitrate concentrations. Gross alpha activity in two wells exceeded the reference value of 0.56 Bq·L-1. Fluorides and nitrates were found in 40% and 48% of water wells, respectively. Fluoride values were higher than 1.5 mg·L-1, and the exposure doses for adults and children exceeded the reference value of 0.06 mg·kg-1·d-1. Children are the most vulnerable, since their intake doses are near or above of 0.12 mg·kg-1·d

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