Influência de diferentes silanos na resistência de união entre cerâmica de dissilicato de lítio e cimento resinoso

Objective: To evaluate the use of different brands of silane in the bond strength between lithium disilicate and resin cement. The null hypothesis evaluated was that the different brands of silanes would present similar bond strength. Methods: 80 lithium disilicate discs (IPS E.max CAD) were made with 12 mm in diameter x 1 mm in thickness. After crystallization, they were included in PVC tubes with acrylic resin and polished with silicon carbide sandpaper, under irrigation with water, creating a smooth and flat surface and randomly divided into 4 groups (n = 20). G1: Yller; G2: Monobond N; G3: Ultradent; G4: Dentsply Sirona. The samples were stored for 24h in distilled water for subsequent microcutting testing. One-way analysis of variance was used to obtain the results. Results: Analysis of variance showed that there were no statistical differences in the mean values between the treatment groups (p = 0.404). The mean and standard deviation (SD) of the bond strength (MPa) in the groups were: G1: 26.9 (6.3); G2: 28.3 (5.8); G3: 29.0 (8.0); G4: 31.8 (11.0). Conclusions: The different brands of silane evaluated showed similar bond strength. However, application of silane is essential to obtain improvements in bond strength.