TY JOUR TI CHANGES IN BIOCHEMICAL INDICATORS OF ORAL FLUID IN HEALTHY INDIVIDUALS OF DIFFERENT AGE GROUPS AND WITH RELATED DISEASES KW biochemistry of oral fluid KW calcium KW magnesium KW phosphorus KW protein KW concomitant diseases KW different age groups JO Actual problems in dentistry AU Chuykin, O.S. AU Topol'nickiy, O.Z. AU Kuchuk, K.N. AU Chuykin, S.V. AU Davletshin, N.A. AU Makusheva, N.V. AU AKATYEVA, G.G. AU Egorova, E.G. AU Basyrov, T.R. PY 2023 IS 19 PB TIRAZH Publishing House