Maxillary sinus surgery has been shown to be a reliable procedure for increasing vertical bone height prior to implant placement. A variety of grafting materials have been proposed, with particulate bone substitutes showing similar clinical results to autogenous bone when rough surfaces implants are used. A barrier membrane is usually placed external to the grafted sinus, covering the antrostomy. In this technical report, the membrane is placed over the window and its borders gently tucked between the inner side of the bony wall and the graft material. This procedure stabilizes the membrane without tacks and prevents graft dislodgement through the antrostomy. Schlagwörter: maxillary sinus augmentation, maxillary sinus grafting complications