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Search Results: 1 - 10 of 49646 matches for " Marília Afonso Rabelo;Hannas "
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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.
Protective effect of green tea on dentin erosion and abrasion
Kato, Melissa Thiemi;Magalh?es, Ana Carolina;Rios, Daniela;Hannas, Angélica Reis;Attin, Thomas;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2009, DOI: 10.1590/S1678-77572009000600004
Abstract: objective: this in situ study evaluated the protective effect of green tea on dentin erosion (ero) and erosion-abrasion (abr). material and methods: ten volunteers wore intraoral palatal appliances with bovine dentin specimens subjected to ero or ero + toothbrushing abrasion performed immediately (ero+i-abr) or 30 min after erosion (ero+30-min-abr). during 2 experimental 5-day crossover phases, the volunteers rinsed with green tea or water (control, 1 min) between each erosive (5 min, cola drink) and abrasive challenge (30 s, toothbrushing), 4x/day. dentin wear was measured by profilometry. results: the green tea reduced the dentin wear significantly for all conditions compared to control. ero+i-abr led to significantly higher wear than ero, but it was not significantly different from ero+30-min-abr. ero+30-min-abr provoked significant higher wear than ero, only for the placebo treatment. conclusions: from the results of the present study, it may be concluded that green tea reduces the dentin wear under erosive/abrasive conditions.
pH-cycling models for in vitro evaluation of the efficacy of fluoridated dentifrices for caries control: strengths and limitations
Buzalaf, Marília Afonso Rabelo;Hannas, Angélica Reis;Magalh?es, Ana Carolina;Rios, Daniela;Honório, Heitor Marques;Delbem, Alberto Carlos Botazzo;
Journal of Applied Oral Science , 2010, DOI: 10.1590/S1678-77572010000400002
Abstract: despite a plethora of in situ studies and clinical trials evaluating the efficacy of fluoridated dentifrices on caries control, in vitro ph cycling models are still broadly used because they mimic the dynamics of mineral loss and gain involved in caries formation. this paper critically reviews the current literature on existing ph-cycling models for the in vitro evaluation of the efficacy of fluoridated dentifrices for caries control, focusing on their strengths and limitations. a search was undertaken in the medline electronic journal database using the keywords "ph-cycling", "demineralization", "remineralization", "in vitro", "fluoride", "dentifrice". the primary outcome was the decrease of demineralization or the increase of remineralization as measured by different methods (e.g.: transverse microradiography) or tooth fluoride uptake. 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. one hundred and sixteen studies were included, of which 42 addressed specifically the comparison of dentifrices using different ph-cycling models. the other studies included meta-analysis or reviews, data about the effect of different fluoride sources on de-remineralization, different methods for analysis de-remineralization and chemical variables and characteristics of dental hard tissues that might have influence on de-remineralization processes. generally, the studies presented ability to detect known results established by clinical trials, to demonstrate dose-related responses in the fluoride content of the dentifrices, and to provide repeatability and reproducibility between tests. in order to accomplish these features satisfactorily, it is mandatory to take into account the type of substrate and baseline artificial lesion, as well as the adequate response variables and statistical approaches to be used. this crit
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.
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.
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.
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.
Plasma as an indicator of bone fluoride levels in rats chronically exposed to fluoride
Carvalho, Juliane Guimar?es de;Oliveira, Rodrigo Cardoso de;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000400005
Abstract: objective: this study evaluated the use of plasma, bone surface (periosteal) and whole bone as biomarkers of chronic fluoride (f) exposure. methods: forty male wistar rats were assigned to 4 groups (n=10/gr) that differed according to the f concentration they received in the drinking water. groups 1, 2, 3 and 4 received water containing 0 (control), 5, 15, and 50 mg f/l, respectively. the rats were killed at 120 days of age. plasma and femur were collected and analyzed for fluoride with the ion specific electrode by the direct method or after hexamethyldisiloxane-facilitated diffusion. data were tested for statistically significant differences by anova and linear regression (p<0.05). results: mean (± se) plasma f concentrations ranged from 0.030 ± 0.002 to 0.187 ± 0.013 (mg/ml). the concentrations in surface and whole bone ranged from 610 ± 32 to 4,693 222; and 647 ± 22 to 3,439 ± 134 μg/g, respectively. the surface/whole f concentration ratios were 0.941, 1.414, 1.173 and 1.377, for groups 1, 2, 3 and 4 respectively. for plasma and whole bone, the difference among all groups was statistically significant, except for group 2 compared to group 1. for bone surface, all groups differed from each other except for group 2 compared to group 3. a significant positive correlation was found between bone surface and whole bone f (r2=0.94), as well as between plasma and bone surface (r2=0.71) and plasma and whole bone (r2=0.74). conclusions: data suggest that both bone surface and whole bone are suitable biomarkers of chronic f exposure in rats and plasma may be used as indicator of bone fluoride levels.
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