6 documents found, page 1 of 1
Análise do processo de fraturamento em componentes de cimento Portland para apl...
Lima, Jeann Diniz Ferreira; Alves, Erisandra Rodrigues; Nogueira, Ricardo Emílio Ferreira Quevedo; Deus, Ênio Pontes deBecause of recent studies with order to use the cement as a material for application in endodontic treatment, in addition to it being one of the most used building materials in civil construction, for this wide range of applications, which are necessary degradation studies. For this study, using Portland cement, the specimens were prepared with the following measures 45 mm x 6.4 mm x 6.4 mm, and they have notch...
Análise numérica e experimental de propagação de trinca aplicada a biocimentos ...
Alves, Erisandra Rodrigues; Albuquerque, José Silvio Veras; Pennafort Junior, Luiz Carlos Gonçalves; Lima, Jeann Diniz FerreiraThe fracture toughness is an intrinsic property of the material, defined as the mechanical energy required to initiate and propagate a crack in the material until rupture occurs. In this property ceramics and bioceramics, in general, has very low values that can be explained by the existence of very small defects present in the material, which act as stress concentration factors. Calcium phosphate biocements ar...
Caracterização das propriedades físicas e mecânicas de biocimentos de fosfato d...
Albuquerque, José Silvio Veras; Lourenço, Erisandra Rodrigues Alves; Lima, Jeann Diniz Ferreira; Nogueira, Ricardo Emílio Ferreira QuevedoThe biocimentos calcium phosphate are considered fragile and low mechanical properties, which can in the best cases equal the trabecular bone. The objective of this study was to evaluate the diametral compressive strength and porosity of biocimento combined with calcium sulfate dihydrate. The mechanical behavior and porosity of biocimentos were evaluated using samples shaped cylinder of 6 mm height and 12 mm di...
Biocimentos de fosfato de tricácio reforçados com sílica nanométrica
Lourenço, Erisandra Rodrigues Alves; Albuquerque, José Silvio Veras; Lima, Jeann Diniz Ferreira; Nogueira, Ricardo Emílio Ferreira QuevedoThe great advantage of biocimentos calcium phosphate is due to ease of handling and molding, maintaining the response bioactive and osteoconductive. The objective of this study was to obtain new formulations biocimentos by adding 5%, 10% and 15% by weight of silica nanometer. The samples were characterized by X-ray diffraction, infrared spectroscopy, Raman spectroscopy and bending test on three points. The XRD ...
Avaliação do cimento branco acrescido de carbonato de bismuto como um cimento r...
Lima, Jeann Diniz Ferreira; Silva, Rafael Alves da; Nogueira, Ricardo Emílio Ferreira QuevedoThis study evaluated the influence of the addition of an inorganic compound radiopacifier on the properties of the white Portland cement, in order to facilitate its use as cement endodontic, similar to the MTA. First, Portland White cement was characterized by X- ray diffraction; the results show that the sample had similar composition the MTA, with the exception of bismuth in the composition of the material. B...
Desenvolvimento de um cimento endodôntico tendo como referência o agregado trió...
Lima, Jeann Diniz Ferreiran the 90s, a team from Loma Linda University (California - USA) has developed a new endodontic sealer called mineral trioxide aggregate (MTA acronym in English), which has become an alternative to other materials used in retrofillings such as : Super-EBA, cement, zinc oxide eugenol, MRI, gutta percha and silver amalgam. Later work showed that the MTA had similar composition to ordinary Portland cement plus a ra...