Introduction:
Cementation procedure most significantly determinesr successful long-term use of permanent prosthetic restorations. Dental composites intended for direct restorations are not suitable for cementation, but a pre-heating procedure provides them with new properties, due to which they can now be used for placement of prosthetic restorations. Applications of preheated composite include cementation of dental veneers, inlay, onlay and overlay restorations.

Aim of the study:
To perform comparative assessment of mechanical properties such as compressive strength and modulus of elasticity of preheated Enamel Plus Hri composite material (Micerium, Italy) and Rely X U200 self-adhesive composite cement (3M, Germany).

Material and methods:
Roller-shaped 5x3 mm samples, three of each material, were prepared using silicone matrix. Required composite temperature was achieved using Ena-Heat (Micerium, Italy) heating device. The study was performed with the use of universal servohydraulic Instron 8501 mechanical testing machine plus the DTS (Dimensional Tensile Strength) test. Modulus of elasticity was calculated.

Results:
Research analysis revealed 327 MPa compressive strength for composite cement and 530 MPa for pre-heated composite material. The study showed that pre-heated composite material has higher elasticity module (7.9±1.48) so it is more rigid in comparison with self-adhesive cement (5.9±0.35).

Conclusions:
It can be concluded that preheated composite material has better mechanical properties when compared with self-adhesive composite cement. It is thus hoped that better clinical effects in cementation procedure of indirect prosthetic restorations such as inlay, onlay, overlay and veneers will be obtained.