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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.
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.
Calcium glycerophosphate supplemented to soft drinks reduces bovine enamel erosion
Barbosa, Carolina Silveira;Montagnolli, Lia Guimar?es;Kato, Melissa Thiemi;Sampaio, Fábio Correia;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2012, DOI: 10.1590/S1678-77572012000400004
Abstract: objective: this in vitro study evaluated the effect of calcium glycerophosphate (cagp) supplemented to soft drinks on bovine enamel erosion. material and methods: four ph-cycles were performed, alternating demineralization by the beverage and remineralization in artificial saliva. results: mean wear (±sd, μm) was 7.91±1.13, 7.39±1.01, 7.50±0.91 and 5.21±1.08 for coca-cola? without cagp or containing cagp at 0.1, 1.0 or 2.0 mm, respectively, while no wear was detected for cagp at 5.0 and 10.0 mm. corresponding figures for sprite zero? without cagp or containing cagp at 0.1, 1.0, 2.0, 5.0 or 10.0 mm were 8.04±1.30, 7.84±0.71, 7.47±0.80, 4.96±0.81, 3.99±0.10 and 1.87±0.12, respectively. conclusion: supplementation of both beverages with cagp seems to be an alternative to reduce their erosive potential.
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.
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.
Effect of iron supplementation on the erosive potential of carbonated or decarbonated beverage
Kato, Melissa Thiemi;Maria, Andrea Gutierrez;Vaz, Luís Guilherme Matiazi;Italiani, Flávia de Moraes;Sales-Peres, Sílvia Helena de Carvalho;Buzalaf, Marília Afonso Rabelo;
Journal of Applied Oral Science , 2007, DOI: 10.1590/S1678-77572007000100013
Abstract: this study evaluated, in vitro, the effect of iron (previously exposed with enamel powder or added directly to the beverage) on the erosive potential of carbonated or decarbonated beverage. four sets of experiments were done. for groups e1 and e3, a solution containing 30 mmol/l feso4 was added to bovine enamel powder (particles between 75-106 mm) before exposure to the carbonated or decarbonated beverage (sprite zero?), respectively. for groups e2 and e4, 15 mmol/l feso4 was added directly to the carbonated or decarbonated beverage, respectively. control groups were included for comparison. in controls c1 and c3, the experiments e1 and e3 were repeated, but the iron solution was replaced by deionized water. for controls c2 and c4, the carbonated and decarbonated beverage, respectively, was used, without addition of iron. after addition of the beverage to the powdered enamel (40 mg enamel powder/400 ml of final volume), the sample was vortexed for 30 s and immediately centrifuged for 30 s (11,000 rpm). the supernatant was removed after 1 min 40 s. this procedure was repeated in quintuplicate and the phosphate released was analyzed spectrophotometrically. the results were analyzed by student's t-test (p<0.05). e2 presented the best results with a significant inhibition (around 36%) of phosphate released. for e3 and e4 a non-significant inhibition (around 4 and 12%, respectively), was observed. for e1 an increase in phosphate loss was detected. thus, the protective effect of iron seems to be better when this ion is directly added to the carbonated beverage.
Avalia??o das condutas adotadas por profissionais na utiliza??o de coroas metalo-ceramicas
Santos, Carlos Neanes;Kato, Melissa Thiemi;Conti, Paulo César Rodrigues;
Journal of Applied Oral Science , 2003, DOI: 10.1590/S1678-77572003000400004
Abstract: the current features of ceramic fused to metal crowns were evaluated by means of a questionnaire composed by 20 questions concerning the use of this type of restoration in the daily dental practice of professionals from aracaju, bauru and post-graduation students in the area of dental prosthesis. the conclusions were as follows: 1. ceramic fused to metal crowns are the most employed restorations in dentistry. 2. most dentists regard ceramic fused to metal crowns as successful restorations, indicating ceramic occlusal surfaces for most of the patients. 3. even though most professionals use nickel-chromium alloys in ceramic fused to metal crowns for their patients, they prefer the use of noble and semi-noble alloys for restorations in their own mouths. 4. the majority of the interviewees employ ceramic fused to metal crowns for rehabilitation of anterior teeth (57.23%). nevertheless, this was due to the fact that 78% of the dentists from aracaju preferred this type of restoration, whereas in bauru most professionals and students make use of ceramic crowns. 5. most professionals apply zinc phosphate cement for the placement of ceramic fused to metal crowns. most of them prefer to use vita porcelain (34.34%), compared to 13.86% for the noritake and dulceram plus porcelains. 6. the most desired improvement for ceramic fused to metal crowns was the possibility of easy repair.
TENS and low-level laser therapy in the management of temporomandibular disorders
Kato, Melissa Thiemi;Kogawa, Evelyn Mikaela;Santos, Carlos Neanes;Conti, Paulo César Rodrigues;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000200012
Abstract: pain relief and reestablishment of normal jaw function are the main goals of conservative management of temporomandibular disorders (tmd). transcutaneous electrical nerve stimulation (tens) and laser therapy are part of these modalities, although little is known about their real efficacy in controlled studies. this research compared these two treatments in a sample of 18 patients with chronic tmd of muscular origin, divided into two groups (laser and tens). treatment consisted of ten sessions, in a period of 30 days. active range of motion (arom), visual analogue scale (vas) of pain and muscle (masseter and anterior temporalis) palpation were used for follow-up analysis. data were analyzed by friedman test and anova for repeated measurements. results showed decrease in pain and increase in arom for both groups (p<0.05), and improvement in muscle tenderness for the laser group. authors concluded that both therapies are effective as part of tmd management and a cumulative effect may be responsible for the improvement. caution is suggested when analyzing these results because of the self-limiting feature of musculoskeletal conditions like tmd.
Evaluation of the efficacy of low-level laser therapy (LLLT) and the microelectric neurostimulation (MENS) in the treatment of myogenic temporomandibular disorders: a randomized clinical trial
Kogawa, Evelyn Mikaela;Kato, Melissa Thiemi;Santos, Carlos Neanes;Conti, Paulo César Rodrigues;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000300015
Abstract: objective: the aim of the present study was to evaluate the efficacy of low-level laser therapy (lllt) and the microelectric neurostimulation (mens) in the treatment of patients with temporomandibular disorders (tmd). material and methods: a sample of 19 individuals presenting with signs and symptoms of myogenic tmd was randomly divided into two groups (i - lllt and ii - mens). therapy was done in 10 sessions, three times a week, for one month. patients were evaluated by the visual analogue scale (vas), measurement of active range of motion (arom) and muscle palpation, performed immediately before and 5 minutes after each therapeutic session by a blinded tmd specialist. the anova for repeated measurements and mann-whitney tests were used for the statistical analysis. results: the results showed an increase in maximum mouth opening and a decrease in tenderness to palpation for both groups. the vas reduced for both groups, although more evident for the laser group (p<0.05). conclusion: authors concluded that both therapies were effective as part of the tmd treatment, and the cumulative effect may have been responsible for this fact. however, caution is recommended when judging the results due to the self-limiting aspect of musculoskeletal conditions such as tmd.
Centric relation registration: intra- and interexaminer agreement after a calibration program
Kogawa Evelyn Mikaela,Lopes Luis Fernando Risso,Kato Melissa Thiemi,Ueno Fernando Tsuyoshi
Pesquisa Odontológica Brasileira , 2003,
Abstract: Centric relation (CR) has been considered a maxillomandibular position of choice for some dental and prosthetic procedures. Although regarded as a fully reproducible relation, there is great controversy about its clinical use and recording technique, especially in patients with signs and symptoms of temporomandibular disorders (TMD). This study aimed at evaluating the effectiveness of a training program on intra- and interexaminer agreement when determining the clinical record of the CR position. Forty individuals constituted the sample, divided into symptomatic (TMD) and asymptomatic groups. Three previously calibrated examiners performed the initial assessment and the second evaluation after 30 days in a blind design, using Dawson?s bilateral manipulation technique with and without an anterior stop. The amount of frontal and sagittal deviations in relation to intercuspal position, the presence of pain and discomfort during manipulation, and the first occlusal contact in CR were analyzed. Kendall and Kappa tests with a 5% level of significance were used to determine agreement. Values for both intra- and interexaminer agreement were deemed good. The best results were obtained for frontal deviations and assessment of pain (or absence of it) during manipulation. Sagittal deviations showed the lowest agreement in both examinations. The authors concluded that a calibration program could be effective for intra- and interexaminer agreement when recording centric relation. However, caution is recommended when analyzing some isolated items.
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