Nowadays porcelain has been the most used material to constructing fixed prosthodontics. It may be influenced by many factors when assembled on oral environment. Objective: The aim of present study was evaluate in vitro the action of sodium fluoride, present in dentifrices, on superficial roughness of two porcelains: A – conventional feldspathic porcelain to metalloceramics restorations (Vita Omega 900) and B – low-fusing porcelain to titanium (Titankeramik). Methods: Therefore, it was produced ten standardized samples (S) (diameter, fusion, polishing and vitrification) of each one. The superficial roughness was measured in five pre-established zones in each one of the S with a rugosimeter. After that, the S were immersed in a sodium fluoride solution, 1500 ppm and pH 6,8, that was displaced twice a day, kept on 37º C temperature. After 184 hours, the TB were submitted to a new reading. Results: Through the statistics analysis (paired t test) was observed that averages ± standard deviation of each ceramic, before and after immersion, were respectively 0.581±0.196µm and 1.246±0.470µm to porcelain Aand 1.174±0.775µm and 0.530±0.207µm to porcelain B, revealing to be statistically significant for each ceramic (p<0,05). Non-paired t test showed significant increase on superficial roughness of porcelain A and decrease on porcelain B (t=4,79;gl=18;p=0,001<0,05).
Conclusion: It was concluded that the Vita Omega 900 porcelain presented higher superficial roughness than the Titankeramik after immersion in sodium fluoride solution.