TY JOUR TI INFLUENCE OF AGE ON PERIODONTAL HUMAN HEALTH KW aging KW biological age KW degenerative-dystrophic changes KW periodontal disease KW cytological examination KW buccal epithelium KW buccal cytogram JO Actual problems in dentistry AU Semencova, E.A. AU Bazarnyy, V.V. AU Mandra, Y.V. AU Polushina, L.G. AU Svetlakova, E.N. PY 2020 IS 16 PB TIRAZH Publishing House