Rating of dual-cure composite cements by adhesion strength

Taking into account the demand by patients, the issues of improving the aesthetics of a smile with the use of veneers are becoming more and more relevant. The increased service life of veneers is to a certain extent due to the adhesive strength of composite cements. Materials and methods. Double-curing composite cements "Diamondbrite Multi Cure Composite cement", "Panavia F 2.0", "Totalcem", "Variolink Aesthetic DC", "Flowfix DUO", "Compofix", "Compofix + primer" were accepted for the assessment of adhesive strength. These cements were applied to the ends of cylinders made of zirconium oxide stabilized with yttrium oxide "Ext" 3D-PRO. Under the influence of light, the cements polymerized, and the resulting structures were loaded until they collapsed. Results. According to GOST R 56924-2016, sufficient AP was demonstrated by cements Totalcem - 17.391.09 MPa, Panavia F 2.0 - 19.031.44 MPa, Diamondbrite Multi Cure Composite cement - 20.550.78 MPa, and Flowfix DUO - 21.001.20 MPa. Statistical differences in AP in this group are unreliable. Compofix cements 37.102.50 MPa demonstrated high AP (statistical differences in AP between Flowfix DUO and Compofix are significant: (t 5.81; p=0.000021), Variolink 37.702.21 MPa, Compofix+ Primer 41.782.78 MPa. Statistical differences in the AP index in the group of cements with high AP are unreliable. Discussion. It cannot be said that cements with high AP significantly increase the service life of veneers, since violations of the aesthetics of a smile are possible even with a firmly fixed veneer. An example of this can be situations with the formation of discoloritis due to the dissolution of fixing cement, the appearance of caries on the tooth surface not covered with veneer, and the subsequent change in the optical properties of the veneer in the projection of the tooth hard tissue dimensionalization. For this reason, the multicomponent concept of performance characteristics of double-cured composite cements requires further study.