GRAFTLESS SOFT TISSUE AUGMENTATION WITH VOLUMETRIC-STABLE COLLAGEN MATRIX: CASE SERIES AND EARLY RESULTS Article Adzhieva A., Khabadze Z., Zoryan A., Bagdasarova I., Omarova K., Verdiyan S., Nalchajyan H., Mordanov O., Shilyaeva E., Nazarova D., Kotelnikova A. Journal of International Dental and Medical Research. University of Dicle. Vol. 14. 2021. P. 1127-1131