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Search Results: 1 - 10 of 51735 matches for " Marília Afonso Rabelo;Bastos "
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Fluoride concentration in water at the area supplied by the Water Treatment Station of Bauru, SP
Lodi, Carolina Simonetti;Ramires, Irene;Buzalaf, Marília Afonso Rabelo;Bastos, José Roberto de Magalh?es;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000500012
Abstract: objective: to analyze the fluoride concentration in the public water supply at the area supplied by the water treatment station of bauru and classify the samples as acceptable or unacceptable according to the fluoride concentration. material and methods: samples were collected from 30 areas at two periods, october 2002 and march 2003. the fluoride concentration in the samples was determined in duplicate, using an ion sensitive electrode (orion 9609) connected to a potentiometer (procyon, model 720). samples with fluoride concentration ranging from 0.55 to 0.84 mg f/l were considered acceptable, and those whose concentration was outside this range as unacceptable. data were analyzed by descriptive statistics. results: the fluoride concentration of the water samples varied between 0.31 and 2.01 mg f/l. nearly 56% of the samples were classified as acceptable. conclusion: the variations in fluoride concentration at the area supplied by the water treatment station reinforce the need of constant monitoring for maintenance of adequate fluoride levels in the public water supply.
Dental caries and dental fluorosis in 7-12-year-old schoolchildren in Catal?o, Goiás, Brazil
Bardal, Priscila Ariede Petinuci;Olympio, Kelly Polido Kaneshiro;Buzalaf, Marília Afonso Rabelo;Bastos, José Roberto de Magalh?es;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000100008
Abstract: introduction: over the last two decades, the prevalence of dental caries in children has decreased and the prevalence of dental fluorosis has increased. knowledge on the epidemiologic conditions of a population is fundamental for the planning of health programs. objectives: to determine the prevalence of dental caries and dental fluorosis among schoolchildren, in catal?o, goiás, brazil. methods: a random sample of 432 schoolchildren aged 7-12-years old was obtained. who (1997) criteria for dental caries and fluorosis diagnosis were used. results: the dmft indexes were 0.97; 1.20; 1.80; 1.62; 2.40 and 2.51 for 7, 8, 9, 10, 11 and 12 years old, respectively. analysis of dental fluorosis for the same ages presented higher prevalence at 12 years old and for the female gender. the percentage of questionable dental fluorosis (dean's classification) was 34.0%. only 3% of the sample presented dental fluorosis with scores very mild, mild and moderate. conclusions: the prevalence of caries in schoolchildren of catal?o, goiás, brazil, was low. in average, private schools showed better results than public schools; however, all schools presented a low dmft index. in this study, dental fluorosis is not a public health problem and has not damaged dental esthetics.
Xylitol concentrations in artificial saliva after application of different xylitol dental varnishes
Pereira, Agnes de Fátima Faustino;Silva, Thiago Cruvinel da;Silva, Thelma Lopes da;Caldana, Magali de Lourdes;Bastos, José Roberto Magalh?es;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2012, DOI: 10.1590/S1678-77572012000200004
Abstract: objective: the present study analyzed xylitol concentrations in artificial saliva over time after application of varnishes containing 10% and 20% xylitol. material and methods: fifteen bovine enamel specimens (8x4 mm) were randomly allocated to 3 groups (n=5/group), according to the type of varnish used: 10% xylitol, 20% xylitol and no xylitol (control). after varnish application (4 mg), specimens were immersed in vials containing 500 μl of artificial saliva. saliva samples were collected in different times (1, 8, 12, 16, 24, 48 and 72 h) and xylitol concentrations were analyzed. data were assessed by two-way repeated-measures anova (p<0.05). results: colorimetric analysis was not able to detect xylitol in saliva samples of the control group. salivary xylitol concentrations were significantly higher up to 8 h after application of the 20% xylitol varnish. thereafter, the 10% xylitol varnish released larger amounts of that polyol in artificial saliva. conclusions: despite the results in short-term, sustained xylitol releases could be obtained when the 10% xylitol varnish was used. these varnishes seem to be viable alternatives to increase salivary xylitol levels, and therefore, should be clinically tested to confirm their effectiveness.
Educa??o e motiva??o em saúde bucal: prevenindo doen?as e promovendo saúde em pacientes sob tratamento ortod?ntico
Bardal, Priscila Ariede Petinuci;Olympio, Kelly Polido Kaneshiro;Bastos, José Roberto de Magalh?es;Henriques, José Fernando Castanha;Buzalaf, Marília Afonso Rabelo;
Dental Press Journal of Orthodontics , 2011, DOI: 10.1590/S2176-94512011000300012
Abstract: introduction: it is incumbent upon dentists to prevent disease, minimize risks and promote health. patients also need to be made aware of their role in oral health care. patients undergoing orthodontic treatment find it particularly difficult to maintain satisfactory oral hygiene owing to the presence of bands, wires and ligatures. it is therefore crucial to establish preventive motivation and guidance methods to ensure mechanical control of dental plaque. objectives: this study investigated the effects of educational, preventive and motivational actions on the oral health of patients undergoing fixed orthodontic treatment. methods: participants received free toothpaste and toothbrushes throughout the study and instructions on oral hygiene were provided and reinforced throughout the six months of research. physical examination was performed at baseline and after 6, 12 and 24 weeks for verification of plaque, gingival and bleeding indices. results: initially, the oral hygiene of participants was inadequate. during the study, significant improvement in oral health occurred in all indices. preventive, educational and motivational actions undertaken in this study were statistically effective in improving the oral health of orthodontic patients. conclusion: health promotion and disease prevention should be part and parcel of the care provided by orthodontists directly to their patients whereas oral health care guidance and motivation should be provided before and during treatment.
A fluoreta??o da água de abastecimento público e seus benefícios no controle da cárie dentária: cinqüenta anos no Brasil
Ramires,Irene; Buzalaf,Marília Afonso Rabelo;
Ciência & Saúde Coletiva , 2007, DOI: 10.1590/S1413-81232007000400027
Abstract: fluoridation of public water supplies is among the most important public health measures for control of dental caries. through a review of the literature, this study intends to reaffirm the importance and scope of fluoridation for caries control, as this is acknowledged as one of the most effective ways of ensuring the constant presence of fluoride in the oral cavity, which is vital for controlling caries. water fluoridation is rated as an important factor for reducing caries, meaning that it should be maintained and also monitored, ensuring adequate fluoride levels for controlling caries while avoiding dental fluorosis.
Iron supplementation reduces the erosive potential of a cola drink on enamel and dentin in situ
Kato, Melissa Thiemi;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2012, DOI: 10.1590/S1678-77572012000300004
Abstract: iron has been suggested to reduce the erosive potential of cola drinks in vitro.objective: the aim of this study was to evaluate in situ the effect of ferrous sulfate supplementation on the inhibition of the erosion caused by a cola drink. material and methods: ten adult volunteers participated in a crossover protocol conducted in two phases of 5 days, separated by a washout period of 7 days. in each phase, they wore palatal devices containing two human enamel and two human dentin blocks. the volunteers immersed the devices for 5 min in 150 ml of cola drink (coca-colatm, ph 2.6), containing ferrous sulfate (10 mmol/l) or not (control), 4 times per day. the effect of ferrous sulfate on the inhibition of erosion was evaluated by profilometry (wear). data were analyzed by paired t tests (p<0.05). results: the mean wear (±se) was significantly reduced in the presence of ferrous sulfate, both for enamel (control: 5.8±1.0 μm; ferrous sulfate: 2.8±0.6 μm) and dentin (control: 4.8±0.8 μm; ferrous sulfate: 1.7±0.7 μm). conclusions: the supplementation of cola drinks with ferrous sulfate can be a good alternative for the reduction of their erosive potential. additional studies should be done to test if lower ferrous sulfate concentrations can also have a protective effect as well as the combination of ferrous sulfate with other ions.
Effect of one-bottle adhesive systems on the fluoride release of a resin-modified glass ionomer
Wang, Linda;Buzalaf, Marília Afonso Rabelo;Atta, Maria Teresa;
Journal of Applied Oral Science , 2004, DOI: 10.1590/S1678-77572004000100003
Abstract: a dhesive systems associated to resin-modified glass ionomer cements are employed for the achievement of a higher bond strength to dentin. despite this benefit, other properties should not be damaged. this study aimed at evaluating the short-time fluoride release of a resin-modified glass ionomer cement coated with two one-bottle adhesive systems in a ph cycling system. four combinations were investigated: g1: vitremer (v); g2: vitremer + primer (vp); g3: vitremer + single bond (vsb) and g4: vitremer + prime & bond 2.1 (vpb). sb is a fluoride-free and pb is a fluoride-containing system. after preparation of the vitremer specimens, two coats of the selected adhesive system were carefully applied and light-cured. specimens were immersed in demineralizing solution for 6 hours followed by immersion in remineralizing solution for 18 hours, totalizing the 15-day cycle. all groups released fluoride in a similar pattern, with a greater release in the beginning and decreasing with time. vp showed the greatest fluoride release, followed by v, with no statistical difference. vsb and vpb released less fluoride compared to v and vp, with statistical difference. regardless the one-bottle adhesive system, application of coating decreased the fluoride release from the resin-modified glass ionomer cements. this suggests that this combination would reduce the beneficial effect of the restorative material to the walls around the restoration.
Saliva and dental erosion
Buzalaf, Marília Afonso Rabelo;Hannas, Angélicas Reis;Kato, Melissa Thiemi;
Journal of Applied Oral Science , 2012, DOI: 10.1590/S1678-77572012000500001
Abstract: dental erosion is a multifactorial condition. the consideration of chemical, biological and behavioral factors is fundamental for its prevention and therapy. among the biological factors, saliva is one of the most important parameters in the protection against erosive wear. objective: this review discusses the role of salivary factors on the development of dental erosion. material and methods: a search was undertaken on medline website for papers from 1969 to 2010. the keywords used in the research were "saliva", "acquired pellicle", "salivary flow", "salivary buffering capacity" and "dental erosion". inclusion of studies, data extraction and quality assessment were undertaken independently and in duplicate by two members of the review team. disagreements were solved by discussion and consensus or by a third party. results: several characteristics and properties of saliva play an important role in dental erosion. salivary clearance gradually eliminates the acids through swallowing and saliva presents buffering capacity causing neutralization and buffering of dietary acids. salivary flow allows dilution of the acids. in addition, saliva is supersaturated with respect to tooth mineral, providing calcium, phosphate and fluoride necessary for remineralization after an erosive challenge. furthermore, many proteins present in saliva and acquired pellicle play an important role in dental erosion. conclusions: saliva is the most important biological factor affecting the progression of dental erosion. knowledge of its components and properties involved in this protective role can drive the development of preventive measures targeting to enhance its known beneficial effects.
Fluoride content of UHT milks commercially available in Bauru, Brazil
Buzalaf, Marília Afonso Rabelo;Pessan, Juliano Pelim;Fukushima, Rejane;Dias, Andréia;Rosa, Helena Maria;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000100008
Abstract: objectives: the aims of the present study were to evaluate the fluoride (f) concentrations in whole, defatted and chocolate milks commercially available in brazil and to estimate the daily f intake from these sources. material and methods: f concentrations were determined for 23 brands of milks, after hmds-facilitated diffusion, using a f ion-specific electrode. possible f ingestion per kg body weight was estimated, based on suggested volumes of formula consumption, for infants aging 1 to 12 months. results: f concentrations ranged from 0.02 to 1.6 μg/ml f for all brands analyzed. whole and defatted milks had the lowest f concentrations, ranging from 0.02 to 0.07 μg/ml. with respect to chocolate milks, three brands had f concentrations above 0.5 μg/ml. some brands of chocolate milks exceeded the dose regarded as the threshold level for the development of dental fluorosis, without taking into account other sources of fluoride intake. conclusion: the high fluoride concentrations found in some brands of chocolate milks in the present study indicate that many products may be important contributors to the total fluoride intake, reinforcing the need of assaying fluoride content of foods and beverages consumed by small children.
Slow-release fluoride devices: a literature review
Pessan, Juliano Pelim;Al-Ibrahim, Nahla Saleh;Buzalaf, Marília Afonso Rabelo;Toumba, Kyriacos Jack;
Journal of Applied Oral Science , 2008, DOI: 10.1590/S1678-77572008000400003
Abstract: although the prevalence of caries has decreased dramatically over the past decades, it has become a polarised disease, with most of subjects presenting low caries levels and few individuals accounting for most of the caries affected surfaces. thus it become evident for the need of clinical approaches directed at these high-risk patients, in order to overcome problems related to compliance and low attendance at dental care centres. slow-release fluoride devices were developed based on the inverse relationship existing between intra-oral fluoride levels and dental caries experience. the two main types of slow-release devices - copolymer membrane type and glass bead - are addressed in the present review. a substantial number of studies have demonstrated that these devices are effective in raising intra-oral f concentrations at levels able to reduce enamel solubility, resulting in a caries-protective effect. studies in animals and humans demonstrated that the use of these devices was able to also protect the occlusal surfaces, not normally protected by conventional fluoride regimens. however, retention rates have been shown to be the main problem related to these devices and still requires further improvements. although the results of these studies are very promising, further randomised clinical trials are needed in order to validate the use of these devices in clinical practice. the concept of continuously providing low levels of intra-oral fluoride has great potential for caries prevention in high caries-risk groups.
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