[Medical rugosity (Ra) of the surface of stone models from alginate impressions using two processes: manual...

The differences in superficial smoothness of 108 stone models, obtained from three marks of alginates, manipulated by two different techniques of spatulation (a. manual; and b. mechanic with vibration under vacuum), were studied. The 108 stone models (resultant from the factorial product: 3 alginates x 2 techniques x 6 stones x 3 replica = 108) were analysed by means rugosimeter (Talisurf 10). The results showed that the superficial smoothness of the models was not affected significantly by any of the two techniques tested. The alginate Jeltrate offered the best results, and the group represented by the stones Moldaroc/Gaúcha III/Durastone T/Castone was better than the Vel-Mix, and the Vel-Mix statistically better than the Glastone.