Com a finalidade de avaliar a prevalência de fluorose dentária, foi realizado levantamento epidemiológico em Brasília, Distrito Federal, comunidade na qual o teor de flúor na água de abastecimento público é de 0,8 ppm. Foram examinadas 833 crianças de ambos os sexos com idades variando entre 8 e 12 anos, escolares e residentes em Brasília desde o nascimento. Os exames foram realizados em escolas públicas, em cadeira comum, sob luz natural e campo seco obtido com auxílio de gaze. Por meio do exame dos dentes permanentes anteriores superiores foi levantado o índice de fluorose entre os sexos. O percentual de crianças livres de fluorose apresentou-se elevado (85,36%), enquanto 14,64% mostraram níveis de fluorose dentária entre muito leve e moderado.
The aim of this study was to analyze the organic composition of saliva from children without dental caries and children with early childhood caries (ECC). Two groups of 20 children varying in age from 12 to 47 months were selected: Group I, caries-free children; Group II, children with early childhood caries (ECC). Samples of saliva were collected from each subject and submitted to immunological and biochemical assays. Measurements of total salivary IgA, IgG and IgM were performed by using nephelometric techniques, while total protein concentrations and amylase activity were determined by colorimetric techniques. Comparisons of values between groups were made by using U Mann-Whitney test ( p<0.05). Children with ECC presented significantly higher levels of total salivary IgA and IgG, while the mean values of amylase activity, total protein concentrations and total IgM were similar between the groups. In this study, the presence of ECC was associated with an increase in total salivary IgA.
The aim of this study was to analyze the laboratorial performance of dentin-bonding agents, glass ionomer cements and compomers, regarding the sealing of the gingival margins of class V cavities, prepared on the cementoenamel junction. Standardized class V cavities (4 x 3 x 2 mm) were prepared on the buccal and lingual/palatal surfaces of 20 extracted human third molars. Forty cavities were restored with different combinations of materials, as follows: group 1 (G1)--Vitremer (3M); group 2 (G2)--Vitremer (3M) and Syntac Sprint/Tetric Ceram (Vivadent); Group 3 (G3)--Syntac Sprint/Tetric Ceram (Vivadent); Group 4 (G4)--Prime & Bond 2.1/Variglass (Dentsply). After thermocycling in methylene blue dye, the specimens were longitudinally sectioned and analyzed with a stereoscopic lens in order to evaluate the leakage on the gingival margin. The obtained data were analyzed with the Mann-Whitney test, and the results revealed significantly better sealing (p = 0.05) in G1, when compared with G4. No significant differences were seen between the other groups. Under the given conditions, Vitremer offered better sealing of the gingival margin than the system Prime & Bond 2.1/Variglass.
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