TY JOUR TI EVALUATION OF THE RESULTS OF REPEATED ENDODONTIC TREATMENT OF CHRONIC APICAL PERIODONTITIS USING BIOMATERIALS. CLINICAL OBSERVATION KW repeated endodontic treatment KW optical density KW biomaterials KW chronic apical periodontitis KW densitometry JO Actual problems in dentistry AU Sorokin, A.P. AU Gerasimova, L.P. AU Kabirova, M.F. AU Usmanova, I.N. AU Haybullina, R.R. AU Tuchvatullina, D.N. AU Khairullina, R.A. AU Latypova, E.R. PY 2022 IS 17 PB TIRAZH Publishing House