RESUMEN
The purpose of this work is to define the dependence of adhesive bond strength on a way of cure of adhesive system, application of the primer and bond in two step or in one step in vitro. Chemically curing "Esterfill bond" (AB) and both light-curing primer and bond, and composite hybrid light-curing restorative material "Esterfill PHOTO" (EP) (DIAS LTD, Russia) were used. The shear bond strength was measured according to recommendation of ISO 11405:1994. The apparatus for these tests corresponds to ISO 10477, addition I. Shear bond strength was measured on enamel of 83 extracted human molars. Teeth were divided into 7 groups. Before using of adhesive system enamel was etched by 37% phosphoric acid during 60 sec. For measuring of shear bond strength the post composite restorative material "EP" (dentin) has been used. The received data show that the shear bond strength does nat depend on the type of cure, the composition of the bonds being similar. Using primer before application of the bond increases the shear bond strength approximately by 4-5 MPa. The inclusion of the primer in the content of the bond system increases the adhesion to enamel by 9 MPa.