TY JOUR TI THE STUDY OF BOUNDARY PERMEABILITY OF MATERIALS USED FOR FISSURE SEALING KW dental caries KW fissure sealing KW monomeric sealants KW glass ionomer cements KW sealants JO Actual problems in dentistry AU Lunitsyna, Y.V. AU Bondarenko, O.V. AU Voblova, T.V. AU Rikhter, A.A. AU Tokmakova, S.I. PY 2019 IS 15 PB TIRAZH Publishing House