TY JOUR TI PREVALENCE OF PERIAPICAL TISSUE DISEASES KW diseases of periapical diseases KW complications of caries KW prevalence KW endodontic status KW resistance KW periodontitis JO Actual problems in dentistry AU Betkova, K.V. AU Lomiashvili, L.M. AU Chekina, A.V. AU Poselyanova, I.V. PY 2021 IS 17 PB TIRAZH Publishing House