TY JOUR TI THE LEVEL OF ESSENTIAL AND TOXIC ELEMENTS IN BIOLOGICAL MEDIA OF THE ORAL CAVITY IN WORKERS OF THE ORE MINING AND PROCESSING PLANT INVOLVED IN THE EXTRACTION AND PROCESSING OF COPPER-ZINC ORES KW JO Actual problems in dentistry AU Trofimchuk, A.A. AU Kabirova, M.F. AU Gulyaeva, O.A. AU Larionova, T.K. AU Karimova, L.K. AU Salyahova, G.A. PY 2018 IS 14 PB TIRAZH Publishing House