(c) Sinus lift procedures
Impact placement in the premolar and molar region may be problematic due to the presence of the anatomical structure called the maxillary sinus. This is a hollow cavity in the upper jaw (maxilla) on both sides of the skull which, in some cases, extends very low into the root areas of the posterior teeth, thus limiting the height of available bone. Since implants must be inserted in sound bone, without the risk of displacement into the maxillary sinus, the height of bone must be increased, provided that this is permitted by the anatomy of the area.
Sinus lift procedures allow for the placement of implants in areas with limited bone height. Bone grafts and membranes are used to fill the part of the sinus necessary. Depending on the extent of the sinus augmentation, implants may be placed simultaneously or at a second stage surgery.