TY JOUR TI THE FEATURES OF CHRONIC PERIODONTITIS, COMPLICATED BY FURCATION DEFECTS. CAUSES OF DEFECTS. LITERATURE REVIEW KW furcation defects KW furcation perforation KW furcation periodontitis KW apical periodontitis KW root canal JO Actual problems in dentistry AU Khabadze, Z.S. AU Gasbanov, M.A. AU Bolyachin, A.V. AU Taberdiev, T.R. AU Mordanov, O.S. PY 2022 IS 18 PB TIRAZH Publishing House