TY JOUR TI COMPARATIVE EVALUATION OF EDGE PENETRATION SEALING MATERIALS USED FOR RETROGRADE ROT CANAL TETH (LABORATORY STUDY ) KW boundary permeability KW retrograde filling KW filling material JO Actual problems in dentistry AU Lunizyna, Y.V. AU Tokmakova, S.I. PY 2014 IS 10 PB TIRAZH Publishing House