On top of your upper teeth and behind your cheeks, lie the maxillary sinuses which are empty, air-filled spaces. Some roots of your upper teeth may extend till these sinuses, hence, when the tooth is removed, the wall separating the bone and the mouth remains quite thin. Because of this thin wall, the placement of dental implants becomes very difficult.
A sinus lift or augmentation can allow for new bone formation by raising the sinus floor. If you have suffered bone loss in your upper jaw, then a sinus lift is a common procedure for you. This procedure aims to grow bone on the floor of the maxillary sinus. Because the bone in this location either grows or becomes stronger, the process of dental implants becomes easier.