This doctoral thesis focuses on the investigation of the influence of various luting sys-tems on the damping behavior of dental CAD/CAM materials. The objective was to analyze the damping properties of conventional and experimental luting materials in prosthetic applications and to evaluate their effects on the longevity and functionality of dental restorations. The experimental investigations included static and dynamic hard-ness measurements as well as extensive chewing simulations. Various luting materials were tested, including a conventional and a resin-modified glass ionomer cement, Ketac Cem and Meron, self-adhesive composite materials RelyX Unicem 2, G-Cem, Bifix SE, and Calibra Universal, and experimentally used silicones Elastosil, Mucopren, and EX-A'lence Putty, as well as the provisional zinc oxide-eugenol cement TempBond. These materials were measured both in isolated form and in combination with glass plate con-structions. Selected materials were also examined in a ceramic-titanium bilayer to cap-ture the interactions between clinically used material combinations. Both Martens hard-ness testing and the Leeb hardness test were employed. The latter revealed tendencies in the different damping capacities of the material combinations, which were corroborated by the chewing simulator load tests. Finally, the four materials RelyX Unicem 2, G-Cem, Ketac Cem and Elastosil were cho-sen to be cyclically loaded in the chewing simulator between a feldspar ceramic crown and a titanium stump. The study results demonstrated that the experimentally used silicone, Elastosil, exhibit-ed superior damping properties, particularly in the ceramic-titanium bilayer and in the abrasion of Cerec crowns. Interestingly, the conventional GIC Ketac Cem outperformed the composite luting materials in the chewing simulation, indicating more favourable damping capabilities in dynamic loading scenarios, where the composite materials con-sistently showed the lowest damping capacity across all test series. These findings enhance the understanding of the damping properties of dental luting materials and can contribute to refining selection criteria to optimize both the functional durability and comfort of dental restorations. Future research could focus on long-term studies to further explore and validate the effects observed in vitro.
