Demkovych , A. and Marfiian , O. 2025. Changes in the antioxidant defense system of the body in periodontitis of bacterial-immune genesis and against the background of using metal crowns. Medicni perspektivi. 30, 3 (Sep. 2025), 14–24. DOI:https://doi.org/10.26641/2307-0404.2025.3.340535.