Assuntos
Benzo(a)pireno , Tabaco , Fumaça , Qualidade de Produtos para o Consumidor , Teste de MateriaisAssuntos
Nitrosaminas , Tabaco , Fumaça , Qualidade de Produtos para o Consumidor , Teste de MateriaisRESUMO
This study was carried out to measure the dimensional changes in silicone impression material, which can affect the fitness of the prosthesis. Using both single and double mix techniques, 20 impression samples for each of 3 different proprietary silicones, Xantopren- H, President and Fulldent, were made. Selected measurements were made on the stone casts made from each impression. In all 3 cases, the single mix gave more accurate casts than the double mix technique. The Xantopren- H impressions had the most accurate dimensions
Assuntos
Técnica de Moldagem Odontológica , Modelos Dentários , Elastômeros de Silicone , Teste de Materiais , Propriedades de Superfície , Materiais para Moldagem OdontológicaRESUMO
Shear and tensile bond strengths of 40 human and 40 bovine teeth were compared. Teeth were randomly assigned to group I, which received light-cured composite resin, or group II, which received light-cured resin-reinforced glass ionomer cement. The groups were subdivided for shear and tensile bond strength tests, which were conducted on a universal testing machine installed to a computer transducer. Statistical analysis revealed a highly significant difference between shear and tensile bond strengths of human and bovine enamel; however, regression prediction equations support the use of bovine teeth as a reliable substitute to human counterparts in bonding studies of orthodontic adhesion
