Above your molar and premolar teeth in the upper jaw on both sides lies a cavity called the maxillary sinus, or maxillary antrum. If you loose a tooth below the maxillary sinus, once the bone has healed where the tooth used to be, sometimes there is no longer adequate height of bone in which to place a dental implant in to. The most predictable technique to generate extra bone height is to perform a sinus lift. This involves making a small window in the side of the sinus above where the tooth is to be replaced. The thin membrane that lines the sinus, called the Schneiderian membrane, is then elevated to create a pocket into which a combination of graft material (bovine xenograft) and some autogenous bone (bone from yourself collected from the local area are placed. The window that was made is then covered with a porcine collagen membrane and then the gum stitched back together. We then wait a period of