Residual Monomer
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Residual monomer in a composite resin after light-curing with different sources, light intensities and spectra of radiation
O objetivo deste trabalho foi investigar a quantidade de monômero residual em resinas compostas fotopolimerizadas, empregando diferentes fontes de energia, variadas intensidades e espectros de radiação. As amostras de resina (4 mm de diâmetro e 2 mm de espessura) foram fabricadas em matrizes de Plexglass e polimerizadas com lâmpada halógena, LED e PAC
Brazilian Dental Journal. Publicado em: 2006
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14. Mathematical modeling and experimental study of styrene - butadiene emulsion copolymerization. / Modelagem matemática e estudo experimental da copolimerização de estireno e butadieno em emulsão.
Neste trabalho, estudos da copolimerização em emulsão de estireno e butadieno foram realizados em duas etapas. A primeira etapa consistiu na obtenção de um modelo matemático que representasse os processos em batelada e em semicontínuo através das principais variáveis do processo. Na segunda etapa, o efeito de diversas variáveis importantes ao proce
Publicado em: 2006
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15. "Estudo das resinas acrílicas para bases de próteses totais com relação à resistência flexural, e à quantidade de monômero residual superficial" / Study of acrylic resin for complete denture considering flexural strength and quantity of superficial residual mono mer
The purpose of this work was the evaluation of flexural strength and quantity of superficial residual monomer in acrylic resin for complete denture. To perform both analyses it was developed specimens with a dimension of 2.5mm x 10mm x 65mm. The inclusion process was standardized by the use of plastic flasks reinforced with fiberglass. Seven groups were cons
Publicado em: 2005
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16. Evaluation of parameters associated with UV/EB cured clearcoats degradation used in outdoor environment / Avaliação da formação e degradação de filmes de vernizes curados por radiação ultravioleta e feixe de elétrons e expostos ao envelhecimento acelerado
The materials curable by ultraviolet (UV) or electron beam (EB) radiation such as inks, adhesives and coatings are reactive compounds made up of resin, monomer, photoinitiator and additives which undergo polymerization and crosslinking under irradiation producing thermoset products. This technology has been used in a great variety of industrial applications,
Publicado em: 2003
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17. Estudo dos efeitos do iniciador n-Butil LÃtio, do agente de terminaÃÃo 1,2-Butadieno e da temperatura sobre a polimerizaÃÃo do 1,3-Butadieno em solvente apolar
The synthetic rubber production industries form one of the important sectors in petrochemical industry. The polibutadiene, one of the products originated from this sector, is the synthetic elastomer second-most produced worldwide. However, it has been notice that, regardless of the many papers already published about this subject, there are still many contro
Publicado em: 2003
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18. Influencia da posição e do numero de muflas no microondas sobre a liberação de monomero residual, dureza de superficie e porosidade da resina acrilica Acron MC
In attempt to save working time, microwave-polymerized dentures can be processed simultaneously. However, little concern exists about possible uneven acrylic resin polymerization when inserting multiple flasks in a microwave oven. Thus, this .study evaluated the effect of number and position of flasks in the monomer release, Knoop hardness and porosity of a
Publicado em: 2001
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19. Avaliação de propriedades mecanicas e quimica, de uma resina acrilica polimerizada sob pressão no microondas, utilizando o sistema de injeção
Injection molded technique is an efficient and accurate method for processing dentures. However, the process may cause adverse effects upon chemical and physical properties of the restn. This study evaluated the effects of injection-molded system, upon a microwave polymerization cycle under pressure (Onda-cryl resin). Control group was formed by compression
Publicado em: 2001
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20. Avaliação in vitro de propriedades mecanicas e quimicas de uma resina autopolimerizavel polida quimicamente, submetida a um ciclo de polimerização complementar com energia de microondas ou agua quente
The monomeric methyl methacrylate can cause tissue damage. The aim of the present study was to investigate the effect of microwave heating and hot water on the residual monomer levei of an acrylic resin chemicaly activated and chemicaly polished and their effects on the transverse strength and internal microhardness. F our groups with specific patterns to ea
Publicado em: 1999
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21. Avaliação do efeito do polimento quimico sobre algumas propriedades fisico quimicas das resinas acrilicas ativadas quimica e termicamente
Although chemical polishing of dental acrylic resins have became a very used alternative, very litlle is known about tt:1e effect on the properties of acrylic resin. This study evaluated the effect of this polishing on the residual monomer release in the water, microhardness, transverse resistence and surface texture of heat and a could curing resins, compar
Publicado em: 1999
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22. Avaliação in vitro da efetividade de polimerização da resina acrilica dental polimerizada atraves de energia de microondas, quando em contato com metal
The conventional method to process acrylic resin is a time consuming step to construct removable prosthodontics. The microwave processing would be a solution,. but there are doubts about this process in metal presence. So the aim of this study was to compare residual monomer, microhardness and porosity of two acrylic resin cured by different methodos in the
Publicado em: 1997
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23. Three-dimensional structures of avidin and the avidin-biotin complex.
The crystal structures of a deglycosylated form of the egg-white glycoprotein avidin and of its complex with biotin have been determined to 2.6 and 3.0 A, respectively. The structures reveal the amino acid residues critical for stabilization of the tetrameric assembly and for the exceptionally tight binding of biotin. Each monomer is an eight-stranded antipa
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24. Enhancement of Residual Arylsulfatase B Activity in Feline Mucopolysaccharidosis VI by Thiol-induced Subunit Association
The molecular pathology of the deficient arylsulfatase B activity in feline mucopolysaccharidosis (MPS) VI was investigated. Compared with the highly purified normal feline hepatic enzyme, the purified MPS VI residual activity had a 100-fold higher Michaelis constant (Km), an altered electrophoretic mobility, half the apparent native molecular weight, and ma