Resistencia a fadigas de ligas do sistema Co-Cr, submetidas ou não a procedimentos de refusão e soldagem
AUTOR(ES)
Guilherme Elias Pessanha Henriques
DATA DE PUBLICAÇÃO
1995
RESUMO
The aim of this study was to evaIuate the fatigue strength of Steldent, Dentorium and Biosil partiaI denture framework Co-Cr based alloys, as new and in mixture of new and previously casted alloy, submitted or not to convencional soldering procedure. Forty rods with 1,7mm in diameter were casted with oxi-acetilene torch for each of the alloys tested. Half specimens were obtained with new alloy and the others, as a misture ofhaIfnew and ha1fpreviously casted alloy. The soldering procedme was conducted in twenty specimens of each alIoy, half new and half refused alloy. The joints were obtained by Co-Cr welding rods and gas-oxygen torch. The solder gap selected was 0,3 mm and the segments were machined until a conicaI shaped end was achieved. The fatigue strength was conducted in a AMSLER (Alfred 1. Amsler &Co. - Shaflhausen - Schaweis - Switzerland) fatigue testing machine and the specimens were sujected to a tensile load of I kg and a ciclic stress amplitude of 2° . Afier failure, the cycles were registered and the fracture surface was examined with scannig electron microscope (S.E.M.) Related to fatigue strength, the results of this study indicated the folIowing: l-As new, Biosil was statistically stronger than Steldent and Dentori~ aIloys; 2-As new, there were no significant differences among soldered specimens, however all were statisticaIly weaker than the intact ones; 3-when refused, there were . no significant differences between Steldent and Dentorium and between Steldent and Biosil, however Biosil was statisticaIly stronger than Dentorium alloy; 4-As refused, the data of soldered specimens were statistically the same, but weaker than the intact ones; 5-there were no significant differences between new and refused specimens, soldered or not
ASSUNTO(S)
metais - fadiga ligas (metalurgia) solda e soldagem protese dentaria parcial removivel
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000100191Documentos Relacionados
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