TY JOUR TI THE LEVEL OF MATRIX METALLOPROTEINASES IN INFLAMMATORY PERIODONTAL DISEASES (Experimental Study) KW gingivitis KW MMP KW experimental model KW topical therapy KW Inflammatory periodontal diseases JO Actual problems in dentistry AU Popov, V.A. AU Kisel'nikova, L.P. AU Shagrov, L.L. AU Zvezdina, Y.M. AU Popova, D.A. PY 2026 IS 22 PB TIRAZH Publishing House