This in vitro study examined dentin bond strength to dentin of two adhesive systems (SBMP-Plus/3M and Prime & Bond2.0/Dentsply) that were used in three different ways: 1) drying with compressed air after washing the etching solution used; 2) moistening with distilled water after drying; and 3) contaminating the dentin surface with fresh saliva after drying. Sixty extracted human molar teeth were embedded in acrylic resin, the buccal surface was ground with 400grit abrasive disks until dentin exposure and divided into 6 groups. The samples were obtained by bonding conical-shaped specimens made of composite resin to dentin (Z-100 - 3M) and submitted to tensile tests performed by a Wolpert Universal machine, at 0.5mm/min speed. The data obtained were transformed into MPa and submitted to statistical analysis with ANOVA and Tukey test. The results showed that the two adhesive systems were not statistically different one from the other (p>0.05) and that Group 1 (7.31±2.91) showed lower tensile strength; those moistened with distilled water (12.74±6.59) had the greatest tensile bond strength, being the difference between them statistically significant at 1% level. The teeth that were contaminated with fresh saliva (10.62±4.75) showed an intermediate value between the two other groups, and there was no statistical difference when compared to both of them
Adhesion; Adhesive systems; Contamination with saliva; Moist dentin
