TY JOUR TI DENTAL MORBIDITY OF SCHOOL CHILDREN KW prevalence KW intensity KW children KW caries KW periodontal disease JO Actual problems in dentistry AU Ismagilov, O.R. AU Shulaev, A.V. AU Statseva, E.Y. AU Ahmetova, G.M. AU Berezin, k.A. PY 2020 IS 15 PB TIRAZH Publishing House