TY JOUR TI CAUSES, DIAGNOSIS AND TREATMENT OF MAXILLARY SINUSITIS, THE CURRENT STATE OF THE PROBLEM KW maxillary sinusitis KW foreign body of the paranasal sinuses KW perforation of the maxillary sinus wall KW sinusotomy KW minimally invasive endoscopic surgery JO Actual problems in dentistry AU Dregalkina, A.A. AU Kostina, I.N. AU Salii, O.V. PY 2019 IS 15 PB TIRAZH Publishing House