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The article aimed to evaluate the color changes of bovine tooth enamel bleached with 10% carbamide peroxide containing different thickeners: Carbopol, Natrosol, and Carboxymethylcellulose. The preparation of specimens was performed using a double-faced diamond disc to obtain 1mm-thick enamel specimens. Each sample was subjected to the staining process with black tea over six days and then immersed in artificial saliva to stabilize the color. The groups were divided and the bleaching protocol was started for 14 days (4h/day), using 10% carbamide peroxide (PC 10%) with Carbopol, and three bleaching agents manipulated in a pharmacy: PC 10% with Carbopol, Natrosol, and Carboxymethylcellulose. The evaluation of color stability was performed using a digital spectrophotometer (Vita EasyShade) after staining, as well as after the bleaching protocol. Statistical analysis was performed using the following tests: Kruskal Wallis and Mann Whitney (p

Submitted by Márcio Ropke (ropke13marcio@gmail.com) on 2017-06-21T13:15:29Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Níveis de fluoretos na água de abastecimento público e em águas engarrafadas, consumo.pdf: 2176183 bytes, checksum: 217648d8dda717cfe6dd49174899b6d5 (MD5) Made available in DSpace on 2017-06-21T13:15:29Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Níveis de fluoretos na água de abastecimento público e em águas engarrafadas, consumo.pdf: 2176183 bytes, checksum: 217648d8dda717cfe6dd49174899b6d5 (MD5) Previous issue date: 2016-04-29 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Objetivou-se analisar o teor de flúor nas águas de abastecimento e engarrafadas e investigar se o consumo destas influencia na prevalência e severidade de cárie dentária em crianças no Sul do Brasil. As coletas de águas de abastecimento foram realizadas em 16 locais, incluindo três Estações de Tratamento de Água. Cinco marcas, com e sem gás, de águas engarrafadas disponíveis em Pelotas/RS foram adquiridas. Realizou-se mensurações por 12 meses (julho de 2013 a junho de 2014) em duplicata. Utilizou-se um eletrodo Orion 96-09 acoplado em um analisador de íons Orion EA-940 (Thermo Scientific Inc., Waltham, USA) para aferição. Frequências mensais dos níveis de fluoreto foram obtidas. Em 2009, realizou-se um estudo transversal aninhado na coorte de nascidos vivos de 2004 em Pelotas/RS, com amostra de 1.123 crianças examinadas clinicamente e as mães entrevistadas. Coletou-se variáveis demográficas, renda familiar, saúde oral das mães, hábitos de higiene oral e o tipo de água ingerido pelas crianças, além do desfecho (cárie dentária). Foram realizadas análises descritivas, bivariada e multivariável por meio do pacote estatístico Stata (versão 12.0). Os resultados demonstraram uniformidade da concentração de fluoreto nos pontos de coletas da água de abastecimento público, sendo que em 15 deles, a concentração esteve localizada dentro dos valores indicados como de maior benefício anticárie e menor risco de fluorose. Nas águas engarrafadas, houve inconstância da concentração de fluoreto. Apenas uma marca comercial (com e sem gás) apresentou valores indicados como benefício anticárie e risco de fluorose, enquanto nas outras marcas houve ou nível insuficiente ou acima do recomendando. Em relação ao ESB-09, a maioria das crianças ingeriram água de 10 abastecimento público (74.7%), porém as crianças mais ricas bebiam mais frequentemente água engarrafada. A prevalência de cárie foi de 48,4% (n=543), com ceos médio = 4,06. A tipo de água ingerida não esteve associado com a prevalência e severidade de cárie na dentição decídua nestas crianças. O controle dos níveis de fluoreto na água de abastecimento público em Pelotas tem sido bem realizado e população recebe água dentro de concentrações adequadas de fluoretos. No entanto, os níveis de fluoreto nas águas minerais parecem inconstantes e inadequados e a fiscalização mais rigorosa deveria ser realizada pelos órgãos de controle. O tipo de água consumida (se de abastecimento público ou engarrafada) não parece influenciar a ocorrência da cárie dentária na infância. This study aimed to analyze the fluoride content in drinking water and bottled water and investigate whether the consumption of water from different sources could influence the occurrence of dental caries in children in southern Brazil. The samples from the public water supply were collected at 16 locations, including three water treatment plants. Five brands of bottled waters with and without gas available in Pelotas / RS were acquired. The measures were realized for 12 months (July 2013 to June 2014) in duplicate. We used an electrode Orion 96-09 coupled to an analyzer Orion EA 940 ion-(Thermo Scientific, Inc., Waltham, USA) for measurement. Monthly frequencies of fluoride levels were obtained. In 2004, there was a cross sectional study nested in the 2004 Pelotas birth cohort in Pelotas / RS. A sample of 1,123 children was bucally examined and their mothers interviewed at the age 5. Demographic variables, family income, oral health of mothers, oral hygiene habits and the type of water ingested by children, and the outcome (tooth decay) were collected in this study. Descriptive, bivariate and multivariate analyzes were performed using Stata (version 12.0). The results showed uniformity in concentration of fluoride in public collection points, and in 15 of them, the concentration was located within the values indicated as the most effective anti-caries and lower risk of fluorosis. In bottled water, there was inconstant vaues for fluoride concentration. One commercial brand, sparkling or not, presented fluoride levels in the range of indicated as anticaries benefit and without risk of fluorosis, while the others brands the fluoride levels had questionable benefit and high risk of fluorosis. Regarding the OHS-09, most children ingested the public water supply (74.7%), but the richest children drank more frequently bottled water. The prevalence of caries was 48.4% (n=543), with mean dmfs = 4.06. The source of water 12 ingested had no influence on caries prevalence or severity in the primary dentition. The control of fluoride levels in public water supply in Pelotas seems to be well performed and the population has received water in adequate fluoride concentrations. However, the fluoride levels of fluoride in bottled water are inconstant and inadequate and a proper legislation control should be made. The source of water consumed (public supply or bottled water) had not influenced the caries occurrence in children aged five.

Submitted by Darlene Silveira (souzasilveirad@yahoo.com.br) on 2013-11-26T10:36:01Z No. of bitstreams: 1 Novel experimental cements for use with the dentin-pulp complex.pdf: 524653 bytes, checksum: ff5d0bff0847c902f310e214e7b4a438 (MD5) Approved for entry into archive by Fabiano Malheiro(fabianomalheiro22@hotmail.com) on 2013-11-26T19:57:30Z (GMT) No. of bitstreams: 1 Novel experimental cements for use with the dentin-pulp complex.pdf: 524653 bytes, checksum: ff5d0bff0847c902f310e214e7b4a438 (MD5) Made available in DSpace on 2013-11-26T19:57:30Z (GMT). No. of bitstreams: 1 Novel experimental cements for use with the dentin-pulp complex.pdf: 524653 bytes, checksum: ff5d0bff0847c902f310e214e7b4a438 (MD5) Previous issue date: 2012 This aim of this study was to evaluate the physicochemical and biological properties of novel experimental cements (Hybrid, Paste and Resin) based on synergistic combinations of existing materials, including pH, diametral tensile strength (DTS) and cytotoxicity comparing them with mineral trioxide aggregate (MTA - Angelus®) and a glass ionomer cement (GIC) developed at our laboratory. For the physicochemical and biological tests, specimens with standard dimensions were produced. pH measurements were performed with digital pH meter at the following time intervals: 3, 24, 48 and 72 h. For the DTS test, cylindrical specimens were subjected to compressive load until fracture. The MTT assay was performed for cytotoxicity evaluation. Data were analyzed by ANOVA and Tukey’s test (α=0.05). Paste group showed pH values similar to MTA, and Hybrid group presented pH values similar to GIC (p>0.05). The tested materials showed pH values ranging from alkaline to near neutrality at the evaluated times. MTA and GIC showed similar DTS values. The lowest and highest DTS values were seen in the Paste and Resin groups, respectively (p

Made available in DSpace on 2014-08-20T14:30:16Z (GMT). No. of bitstreams: 1 Dissertacao_Raquel_Venancio_Fernandes_Dantas.pdf: 1568169 bytes, checksum: fac14a8343217be88d414d49e033b4fa (MD5) Previous issue date: 2011-10-28 There is a need to develop new cements to optimize pulp therapy strategies. The aim of this study was evaluate physic-chemical and biological parameters of experimental cements (Hybrid, Paste and Resinous), including pH, diametral tensile strength and cytotoxicity of these experimental cements comparing them to MTA (Angelus®, Londrina, PR, Brazil) and a glass ionomer cement developed in our laboratory. For the physic-mechanical and biological tests specimens with standard dimensions were produced. For pH measurement, specimens were immersed in culture medium (DMEM) supplemented with FBS (fetal bovine serum) and analyzed by digital pH meter at 3, 24, 48 and 72h. For diametral tensile strength test the specimens were subjected to compressive load until the fracture. To evaluate cytotoxicity 3T3 cells were cultured and exposed to the cement eluates. The cell viability was detected using MTT test. The results were analyzed using analysis of variance (ANOVA) and Tukey's test (p 0.05). All materials presented alkaline pH values or were near to neutrality on evaluated times. MTA and GIC showed similar strength results. The lowest and highest strength values were observed in groups Paste and Resinous, respectively (p 0,05).Todos os materiais apresentaram valores de pH alcalinos ou próximos a neutralidade nos tempos avaliados. O MTA e o CIV apresentaram resultados de resistência similares. Os menores e maiores valores observados foram do grupo Pasta e Resinoso, respectivamente (p