Fig. 2From: Pneumatization within a maxillary sinus graft: a case report a Communication between the left maxillary sinus and the oral cavity (oroantral communication). b Epithelization of the area with the insertion of a fibrin sponge impregnated with colloidal silver. c The sponge was glued to the edges of the flap. d The bloody tissue was suturedBack to article page