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Search Results: 1 - 10 of 3273 matches for " Irene;Pessan "
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Fluoride intake from regular and low fluoride dentifrices by 2-3-year-old children: influence of the dentifrice flavor
Moraes, Samanta Mascarenhas;Pessan, Juliano Pelim;Ramires, Irene;Buzalaf, Marília Afonso Rabelo;
Brazilian Oral Research , 2007, DOI: 10.1590/S1806-83242007000300008
Abstract: this study evaluated the fluoride intake from dentifrices with different fluoride concentrations ([f]) by children aged 24-36 months, as well as the influence of the dentifrice flavor in the amount of fluoride ingested during toothbrushing. thirty-three children were randomly divided into 3 groups, according to the [f] in the dentifrices: g-a (523 μgf/g), g-b (1,062 μgf/g) and g-c (1,373 μgf/g). dentifrices a and b are marketed for children, while dentifrice c is a regular product. the amount of f ingested was indirectly obtained, subtracting the amount expelled and the amount left on the toothbrush from the amount initially loaded onto the brush. the results were analyzed by anova, tukey's test and linear regression analysis (p < 0.05). children ingested around 60% of the dentifrice loaded onto the brush, but no significant differences were seen among the groups (p > 0.05). mean daily fluoride intake from dentifrice for g-a, g-b and g-c was 0.022a, 0.032a and 0.061b mg f/kg body weight, respectively (p < 0.01). there was a strong positive correlation (r = 0.86, p < 0.0001) between the amount of dentifrice used and the amount of fluoride ingested during toothbrushing. the results indicate the need for instructing children's parents and care givers to use a small amount of dentifrice (< 0.3 g) to avoid excessive ingestion of fluoride. the use of low-[f] dentifrices by children younger than 6 years also seems to be a good alternative to minimize fluoride intake. dentifrice flavor did not influence the percentage of fluoride intake.
Fluoride concentrations in industrialized beverages consumed by children in the city of Bauru, Brazil
Lodi, Carolina Simonetti;Ramires, Irene;Pessan, Juliano Pelim;Neves, Lucimara Teixeira das;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2007, DOI: 10.1590/S1678-77572007000300010
Abstract: the increasing consumption of juices, soft drinks and teas among children has increased significantly fluoride ingestion at the age range of risk for development of dental fluorosis. objective: the purpose of this study was to evaluate fluoride concentrations in some brands of industrialized beverages consumed by children in the city of bauru, sp, brazil. material and methods: 98 brands of beverages were analyzed, divided into 3 lots, comprising 36, 32 and 30 brands, respectively, for the first, second and third lots. fluoride concentrations were determined by hmds-facilitated diffusion, using a fluoride ion-specific electrode (orion 9409). results: fluoride concentrations ranged between 0.04 and 1.76 μg f/ml. it was observed a wide variation in fluoride concentrations among the different brands, as well as the different lots of the same brand. there was no information on fluoride concentrations on the labels of any product. conclusions: some of the products analyzed could contribute significantly to the total fluoride intake and, thus, be important risk factors for development of dental fluorosis, which indicates the need of controlling the production of these beverages with respect to fluoride concentration.
Fluoridation of the public water supply and prevalence of dental fluorosis in a peripheral district of the municipality of Bauru, SP
Ramires, Irene;Olympio, Kelly Polido Kaneshiro;Maria, Andréa Gutierrez;Pessan, Juliano Pelim;Cardoso, Vanessa Eid Silva;Lodi, Carolina Simonetti;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000200013
Abstract: objectives: the objectives of this study were to assess the fluoride concentration in the public water supply and the prevalence of dental fluorosis in schoolchildren between 7 and 15 years old, living in a peripheral district of the municipality of bauru. material and methods: for this, fifty two water samples were collected on three different days of one week. these samples were analyzed for fluoride by means of the ion-sensitive electrode method (orion 9609) coupled to a potentiometer (procyon, model 720). in this method, 1.0 ml of tisab ii (orion) was added to 1.0 ml of the sample. for the epidemiological survey of fluorosis, 52 schoolchildren of both genders, aged between 7 and 15 were assessed, with prior authorization from their caretakers. only one person examined the children, after supervised toothbrushing and drying with cotton wool rolls. the tf index was used. results: the fluoride concentrations in the water samples ranged from 0.62 to 1.20 mg/l, with a mean of 0.9 mg/l. the prevalence of dental fluorosis was 33%, with severity ranging from tf1 to tf4 (kappa of 0.73 and concordance of 83.33%). conclusions: the results from the analysis of water samples indicated a fluoride concentration greater than recommended for bauru. the fluorosis levels found were higher than expected for a peripheral district, in which water is one of the few sources of fluoride.
Concentra??o de flúor em águas engarrafadas comercializadas no município de S?o Paulo
Grec,Roberto Henrique da Costa; Moura,Patrícia Garcia de; Pessan,Juliano Pelim; Ramires,Irene; Costa,Beatriz; Buzalaf,Marília Afonso Rabelo;
Revista de Saúde Pública , 2008, DOI: 10.1590/S0034-89102008000100022
Abstract: the objective of the study was to evaluate the fluoride concentration in bottled water available on the market, in comparison with the values printed on the bottle label. two hundred and twenty-nine water samples were collected from 35 brands available in several supermarkets, grocery stores and snack bars with high turnover in different regions of the municipality of s?o paulo, southeastern brazil, in 2006. fluoride concentrations were determined by duplicate analysis using an ion-specific electrode. the fluoride concentrations ranged from 0.01 to 2.04 mg/l, with significant differences between the values stipulated on labels and those found in the analyses. these results emphasize the importance of controls over fluoride levels in bottled water enforced by the sanitary surveillance agency.
Materials Research - Ibero-american Journal of Materials: Judicious, fair and educative!
Pessan Luiz Antonio
Materials Research , 2006,
Prevalence of dental fluorosis in Bauru, S?o Paulo, Brazil
Ramires, Irene;Pessan, Juliano Pelim;Levy, Flávia Mauad;Rodrigues, Maria Heloísa Correia;Almeida, Beatriz Sim?es de;Kato, Melissa Thiemi;Sales Peres, Silvia Helena de Carvalho;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2007, DOI: 10.1590/S1678-77572007000200013
Abstract: objective: to evaluate the prevalence of dental fluorosis in scholars aging 12 to 15 years old, residents in the city of bauru, state of s?o paulo, brazil. methods: 1318 volunteers were enrolled in this study and examined in 18 public schools of the state of s?o paulo. the examinations were performed in the schools' court by three dentists (with a master's degree in public health), after toothbrushing supervised by another dentist. the teeth were dried with cotton pellets and examined under natural light by visual inspection, using an explorer as recommended by the who, a plane mirror and a tongue depressor. the thylstrup-fejerskov (tf) index was used for rating fluorosis. intra and inter-examiner reproducibility was calculated and data were submitted to descriptive analysis. results: approximately 36% of the children presented dental fluorosis, of which 28% was diagnosed as tf1 while the remaining received scores between tf2 and tf4. conclusion: the prevalence of dental fluorosis in bauru is within the expected range, based on previous studies. although fluoride is an important resource for caries control, its use must be adequate to the needs of each specific population.
Influence of calcium carbonate nanoparticles on the crystallization of olypropylene
Eiras, Daniel;Pessan, Luiz Antonio;
Materials Research , 2009, DOI: 10.1590/S1516-14392009000400024
Abstract: the aim of this work was to study the influence of calcium carbonate nanoparticles in crystallization process of polypropylene. four compositions of pp/caco3 nanocomposites were prepared in a co-rotational twin screw extruder machine with calcium carbonate content of 3, 5, 7 and 10 wt. (%). the tests included sem analyzes for calcium carbonate, differential scanning calorimetry (dsc) and wide angle x-ray diffraction (waxd) for the nanocomposites. the results showed an increase in pp crystallization temperature and crystallinity degree, and a reduction in spherullites size. the formation of pp β phase was confirmed by dsc and waxd results. finally from dsc analyses under isothermal conditions it was confirmed that calcium carbonate nanoparticles have a nucleation effect in polypropylene crystallization process by reducing the half crystallization time and increasing the kinetic constant (k).
Mechanical properties of polypropylene/calcium carbonate nanocomposites
Eiras, Daniel;Pessan, Luiz Antonio;
Materials Research , 2009, DOI: 10.1590/S1516-14392009000400023
Abstract: the aim of this work was to study the influence of calcium carbonate nanoparticles in both tensile and impact mechanical properties of a polypropylene homopolymer. four compositions of pp/caco3 nanocomposites were prepared in a co-rotational twin screw extruder machine with calcium carbonate content of 3, 5, 7 and 10 wt. (%) the tests included sem analyzes together with eds analyzer and ftir spectroscopy for calcium carbonate, tensile and impact tests for pp and the nanocomposites. the results showed an increase in pp elastic modulus and a little increase in yield stress. brittle-to-ductile transition temperature was reduced and the impact resistance increased with the addition of nanoparticles. from the stress-strain curves we determined the occurrence of debonding process before yielding leading to stress softening. debonding stress was determined from stress-strain curves corresponding to stress in 1% strain. we concluded that the tensile properties depend on the surface contact area of nanoparticles and on their dispersion. finally we believe that the toughening was due to the formation of diffuse shear because of debonding process.
The role that oilseeds, including new hi-oleic varieties can play in improving the profile of fat intake by the UK population  [PDF]
Janice Irene Harland
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.53024

The production in the EU of the oilseeds, rapeseed and sunflower, has increased dramatically over the last 20 years. Much of the oil produced after crushing is used for culinary purposes; this enhanced intake of vegetable oil has led to a substantial change of fatty acid (FA) supply. This has been conclusively demonstrated by taking the UK oil supply data and by use of the FA profile of the key oils converting the supply data into a FA profile of the UK market place for 2008-2012. The most marked changes are a reduction in saturated fat (SFA) and an increase in monounsaturated fatty acids (MUFA) available for consumption. Furthermore the introduction of varieties of hi-oleic sunflower oil can further affect the market FA profile. The fat profiles of rapeseed and sunflower oils are considered healthy and they can have a positive impact when included in the diet, particularly as a replacement for oils or fats rich in SFA. In the UK and much of Europe, adult SFA intake continues to exceed recommendations. While reductions in the UK population’s SFA intake have occurred over the last 20 years, these are modest and it may be timely to identify ways in which SFA intake can be further reduced. To do this, the UK market FA supply data has been analysed alongside the profile of FA intake from adults recording their intake in national dietary surveys in order to identify if the market supply affects overall FA consumption. There is an indication that market oil supply is reflected in adults dietary intake of the main groups of FA. Consequently changes made to the oil profile of oilseeds by plant breeders and use of the resulting healthier oils by food manufacturers could have important roles to play in helping adults to achieve the recommended intake of SFA and also improve the overall fat quality in their diet leading to enhanced long-term health and well-being. Thus changes made in pri

The Relationship between Access to Mass Media and HIV/AIDS Related Knowledge, Beliefs and Behaviours in Kenya  [PDF]
Irene Muli, Stephen Lawoko
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.57084

Aim: We scrutinized the association between access to mass media and HIV/AIDS related knowledge, beliefs and behaviours in Kenya. Methods: Data on a representative sample of Kenyan women between 15 - 30 years of age (n = 3909) was retrieved from the Kenyan demographic and health survey (DHS 2008) and analyzed using Chi-square tests and binary logistic regression. Results: Media use was common with over 70% of participants using radio at least once a week. Between 3% - 30% of participants had poor to inadequate knowledge/beliefs about HIV/AIDS, with variations depending on demographic and social factors such as age, education, literacy, wealth and residential area. HIV/AIDS knowledge, beliefs and behaviours were associated with exposure to media, even after control for possible co-variation with social and demographic factor. Conclusion: Despite wide exposure to media among young Kenyan women, substantial proportions have poor to inadequate knowledge of the aetiology, risk/protective factors and control measures of HIV/AIDS. Yet, such knowledge was positively associated with media use. Media thus could ideally be used to implement a comprehensive awareness campaign in the general population about the aetiology, risk/protective factors and control measures in HIV/AIDS.

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