TY JOUR TI RESULTS OF USING COLLAGEN MATRIX IN SOFT TISSUE MANAGEMENT IN THE AREA OF DENTAL IMPLANTS IN THE ANTERIOR REGION OF THE UPPER JAW KW xenogeneic collagen matrix KW free connective tissue graft KW dental implant KW soft tissue augmentation KW gingival surgery JO Actual problems in dentistry AU Ashurko, I.P. AU Krylova, D.A. AU Belkin, V.O. AU Yatsenko, A.G. AU Tarasenko, S.V. PY 2024 IS 19 PB TIRAZH Publishing House