Introduction: A laboratory device for light curing dental composite materials based on diode lights was developed. Purpose: We researched the process of light polymerization of dental composite materials that were polymerized in the developed device. The results were compared with the results of polymerization performed on a commercially available device (Solidilite V), which operates based on halogen lights. We highlighted the advantages of the developed device based on diode lights compared to halogen lamps. Methods: The method of theoretical work is descriptive and covers the literature that this thesis deals with. The research part is based on the analysis of the results of the experimental determined flexural strength of the Ceramage composite material. The practical part consists of the production of a full composite crown, which is polymerized in the developed device. Results: From the obtained results, it is evident that the mechanical properties of the composite are influenced by the energy density of the light beam (power density x exposure duration). We found out that the mean time of exposure and the power density lead to higher experimentally determined flexural strength compared to light curing using short exposure times with high power density or long exposure times and low power density. Discussion and conclusion: The self-developed device enables successful light-curing polymerization of dental composite materials based on camphorquinone photoinitiator, with an absorption maximum of 465 nm. The successful performance of the developed device was confirmed by the results of the experimentally determined flexural strength of the composite material and the analysis of its microstructure.