Shear bond strenght between different resinous cements and lithium disilicate ceramic

Abstract Introduction The success of indirect restorations depends on the union between cement and dental substrate. Therefore, the selection and knowledge of the characteristics of cement is important for the retention of indirect restoration. Objective Is to evaluate the bond strength of two different resin cements to ceramic lithium disilicate. Methodology Two experimental groups were made: conventional resin cement (CRC Group) and self-adhesive resin cement (CRA Group). With this, 10 lithium disilicate ceramics discs (10 mm) were prefabricated and on each disc were made 04 cement posts (0.7×1.0 mm), yielding a total of 20 samples of each type of cement. The disks had the same surface treatment for both groups, which is standard for the rich silica ceramic according to the protocol established by the manufacturer. The samples were submitted to microshear test to evaluate the bond strength between the cement and ceramics. Subsequently, the fail mode was analyzed in an optical microscope. Result Data were subjected to statistical analysis. It was observed that the CRC group had a higher bond strength (15.29 MPa) compared to CRA group (12.41 MPa). In the analysis of fail mode, neither samples obtained adhesive fracture. In both groups, CRC (75%) and CRA (65%) it was obtained more failures of the mixed type, followed by the cohesive failure. Conclusion Both cements showed adhesion on ceramic. The conventional resin cement showed better adherence to the ceramic base of lithium disilicate than the self-adhesive resin cement.