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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Comparative study of five Ni-Cr alloys concerning castability and reproducibility / Estudo comparativo entre cinto ligas de níquel-cromo no tocante a fluidez e consequente reprodutibilidade

Mauro D Oliveira 22 December 2004 (has links)
The aim of this study was to verify the behavior of five brands of NiCr alloys, indicated to porcelain fused to metal restorations, comparing the castability with the ability of reproducing the thin edges of restoration margins. The samples were divided in five groups, each one for one brand, with ten repetitions for castability test and ten for edge reproduction, in a total of 100 specimens. A carbon free phosphate bonded investment was used for all casting procedures. Optical microscopy was used to investigate the microstructure of the specimens obtained with two of the alloys, those which have shown better results. Statistical analysis stated that the commercial brand Tilite showed both better castability and edge reproduction. / O objetivo desta pesquisa foi verificar o desempenho de cinco ligas de níquel-cromo para restaurações de metalocerâmicas, comparando a fluidez com a capacidade de cópia da borda fina das restaurações. Os corpos-de-prova foram divididos em 5 grupos um para cada liga, sendo realizado dez corpos-de-prova para o teste de fluidez e dez corpos-de-prova para o teste da cópia da borda, totalizando 100 corpos-de-prova. Um revestimento de fosfato sem carbono foi usado para todas as inclusões e fundições. Em seguida foram submetidos a microscopia óptica, para se observar a microestrutura das duas ligas que obtiveram os melhores desempenhos. Os resultados, após análise estatística, demonstraram que a liga Tilite apresentou a melhor fluidez e melhor cópia da borda.

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