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Id: lil-573728
Autor: Voltarelli, Fernanda Regina; Santos-Daroz, Claudia Batitucci dos; Alves, Marcelo Corrêa; Cavalcanti, Andrea Nóbrega; Marchi, Giselle Maria.
Título: Effect of chemical degradation followed by toothbrushing on the surface roughness of restorative composites
Fonte: J. appl. oral sci;18(6):585-590, Nov.-Dec. 2010. ilus, tab.
Idioma: en.
Resumo: OBJECTIVES: The aim of the present study was to assess the effect of the exposure to food-simulating liquids prior to brushing simulation on the surface roughness of five composite materials (Quixfil, Filtek Supreme, Esthet-X, Filtek Z250, Tetric Ceram). Material and METHODS: Twenty cylinders (5 mm diameter and 4 mm height) of each composite were randomly allocated to 4 groups (n=5), according to the food-simulating liquid in which they were immersed for 7 days at 37°C: artificial saliva, heptane, citric acid, and ethanol. After this period, the top surface of composite cylinders was submitted to 7,500 brushing cycles (200 g load). Measurements of the surface roughness (Ra, »m) were carried out before and after the exposure to the chemicals/brushing simulation. Changes on the morphology of composite surfaces were observed through scanning electron microscopy (SEM). RESULTS: The statistical analysis (ANOVA with cofactor / Tukey's test, α=5 percent) detected a significant interaction between solutions and composite resins. Esthet-X, Filtek Z250 and Tetric Ceram were not affected by the food-simulating liquids/toothbrushing. Citric acid and ethanol increased the surface roughness of Quixfil and Filtek Supreme, respectively. SEM images corroborate the surface roughness findings, demonstrating the negative effect from chemical solutions and mechanical abrasion. CONCLUSIONS: The surface roughness of composite resin materials are differently affected by the food-simulating solutions, depending on the immersion media.
Descritores: Resinas Compostas/química
Escovação Dentária/efeitos adversos
-Análise de Variância
Ácido Cítrico/química
Resinas Compostas/metabolismo
Etanol/química
Heptanos/química
Imersão
Teste de Materiais
Microscopia Eletrônica de Varredura
Propriedades de Superfície
Saliva Artificial/química
Fatores de Tempo
Abrasão Dentária
Responsável: BR1.1 - BIREME


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Id: lil-109888
Autor: Steciow, Mónica; Arambarri, Angélica.
Título: Utilización de hidrocarburos por oomycetes I: achlya polyandra Hildebrand / Hidrocarbons utilization by oomycetes I: achlya polyandra Hildebrand
Fonte: Bol. micol;6(1/2):33-5, jul.-dic. 1991. tab.
Idioma: es.
Resumo: Se ensayó el crecimiento de Achlya polyandra usándose como fuente carbonada: heptano, benceno, xileno, tolueno, nafta común, gas oil y kerosene. Esta especie mostró abundante crecimiento en las dos mezclas hidrocarbonadas (combustibles): gas oil y kerosene; en cambio, fue limitado en tolueno, benceno, xileno y nafta común, no registrando crecimiento en heptano
Descritores: Oomicetos/crescimento & desenvolvimento
-Benzeno
Meios de Cultura
Gasolina
Heptanos
Hidrocarbonetos
Querosene
Tolueno
Xilenos
Responsável: CL2.1 - Biblioteca de Medicina



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