Análise da resistência de uni o de uma resina composta cimentada em esmalte bovino por diferentes técnicas de cimenta o

The aim of this study was to evaluate Z250 (3M/ESPE) composite resin shear bond strength, luted to bovine enamel using Zync Phosphat, Glass Ionomer cement and resin luting cement with 3 different composite resin superfi cial treatment. It was made 75 specimens of bovine incisors and composite resin, that was conformed in a 3mm matrix, lightcured during 20 seconds. The specimens were devided in 5 groups: Group 1 - luted with Zync Phosphat; Group 2 - luted with Glass Ionomer cement; Group 3 - luted with resin luting cement; Group 4 - luted with resin luting cement and composite resin etching/bonding; Group 5 - luted with resin luting cement and composite resin Al2O3 microetching. The specimens were tested in Universal testing machine, throught shear bonding strength, with 0,5 mm/minute speed. Results were statistically analysed by ANOVA and Tukey tests ( = 0,05), that showed Group 4 (resin luting cement and composite resin etching/bonding) has being statistically superior from the others; Group 3 (Resin luting cement) and Group 5 (Resin luting cement and composite resin microetching) did not show statistically signifi cant difference from each other; Group 1(Zync Phosphat) and Group 2 (GIC) showed lowest bond strength and did not show statistically signifi cant difference from each other. The best demonstrated composite resin cementation technique was resin luting cement and restorations etching/bonding, in relation to shear bond strength.