Rajabov O.A, Inoyatov A.Sh and Sobirov. Sh. S 2020. Comparative assessment of structural and functional changes in periodontal tissues during prosthetics with metal-ceramic and zirconium dentures. Middle European Scientific Bulletin. 4, (Sep. 2020), 26-33. DOI:https://doi.org/10.47494/mesb.2020.4.34.