Fickl S, et al. - Physicians compared a porcine collagen matrix (Mucograft Seal, Geistlich) with a free gingival punch graft with respect to size, invagination, and color of resulting soft tissue scar formation. When compared with bovine bone mineral and free gingival punch grafts from the palate, alveolar ridge preservation using bovine bone mineral and porcine collagen matrix led to less scar tissue formation.