The study was aimed at comparison of adhesion of 4th to 6th generation of dentin adhesives by measuring the shear bond strength according to method ISO/TR 11405:1994(E). The study compared the adhesion systems Prompt L-Pop (6th generation), Excite and Prime & Bond NT belonging to the 5th generation, All Bond 2 from the 4th generation of adhesive and Evicrol Dual Bond, which belongs to 2nd generation of adhesives served as a control material. The etching of dentin was performed by the recommended conditioner based of phosphoric acid with the exception of Prompt L-Pop, in the case of Excite the etching was also performed by „no name“ etching gel of similar composition for the sake of comparison. The adhesives were combined with two types of filling materials, the micro-hybrid composite Charisma and the Dyract AP compomer. In the Dyract AP compomer the authors also tested a procedure without dentin etching. In each adhesive the shear strength was tested in the group of 8–14 intact grinding molar with the use of measuring preparation Bencor Multi-T. It has become obvious that Prompt L-Pop provides an easier and faster application, while the bonding stability (9.2–9.6) MPa to both tested filling materials was close to adhesions (7.3–8.8) MPa observed in previous 4th and 5th generations, respectively. On the hand the adhesion system Excite of the 5th generation displayed, in using the original conditioner, approximately two-fold higher MPa values (17.3–19.0). The conditioning of dentin by a no-name gel resulted in adhesions at the level of other types, though. A high level of adhesion of 15.4 MPa was found in a combination of Dyract AP – P&B. In view of lower number of samples the results should be verified in further investigation. As expected, the lowest values were reached with the Evicrol Dual Bond system, where the adhesion values (2.9–3.2) MPa do not warrant sufficient bond strength of the filling material and tooth tissues.

        Key words: dentin adhesives – shear bond stability – composite – compomer