Effect of Different Treatments on the Bond Strength Between Porcelain-Metal

Objective: The purpose of this study was to compare the effect of four different alloy surfaces treatments on the bond strength of the porcelain-metal interface. Material and Method: Forty-eigth acrylic patterns calcined were casting in cobalt-chromium measuring 25 X 3 X 0,5mm (ISO 9693) and divided in four groups. The surfaces treatments were: Group A: surface grinding + sandblast + de-gas; Group B: surface grinding + de-gas + sandblast; Group C: sandblast + surface grinding + sandblast + de-gas and Group D: G4: sandblast + surface grinding + de-gas + sandblast. With a matrix two layers of opaque porcelain, two of dentin and glaze had been applied with 8 x 3 x 1mm (ISO 9693).The three point flexural test was used at a crosshead apeed of 1,5±0,5mm/min (ISO 9693). Results: The mean of bond strength (Kgf) metal-porcelain of the groups were: 1,58±0,0; B: 1,52±0,16; C: 1,63±0,14; D: 1,55±0,12. There was not a statistically significant difference between the groups (P = 0,1938). Conclusion: The four treatments of the metal can be used before the application of the porcelain and the oxide layer did not modify the bond strength of metal-porcelain.