Avalia？？o da fundibilidade de uma liga de cobalto-cromo

the purpose of this study was to evaluate the castability of a cobalt-chromium alloy (vera-pdi) using three investments: knebel (agglutinated by silica), termocast and wirovest (both agglutinated by phosphate) at two molding temperatures (900°c and 950°c); using hinman et al.9 (1985); methodology. the casting method of using a wax and gas-oxygen flame was used. there was no significant statistical difference between the knebel and wirovest investments; however, there was a statistically significant difference for termocast investment (p < 0.1) at the different temperatures. when analyzing the investments at 900° c there was a statistical difference between knebel and termocast and knebel and wirovest at p < 0.1 and for termocast and wirovest at p < 0.05. at 950°c there was a statistically significant difference (p < 0.1) for all coatings. according to the parameters of this study, we conclude that the best results were obtained for the vera-pdi alloy when we use the knebel investment and 950°c for casting.