TY JOUR TI PATHOHISTOLOGICAL CHANGES IN THE MAXILLARY SINUS TISSUES DURING LONG-TERM CONTACT WITH AH PLUS EPOXY SEALANT KW experiment KW maxillary sinus KW root sealants KW Schneiderian membrane KW necrosis KW immunohistochemistry KW fibrosis KW angiogenesis JO Actual problems in dentistry AU Sirak, S.V. AU Gatilo, I.A. AU Pereverzeva, E.S. PY 2026 IS 2021 PB TIRAZH Publishing House