The technical term for a sinus lift is a maxillary sinus floor augmentation procedure. It is a surgical procedure build up part of the upper jaw. The most common reason for this procedure is to build up the area for future dental implants. The material used for the augmentation comes from cadaver bone, but you can have your own bone grafted for this procedure. It is ground up and packed into the space where the sinus was and the soft tissue is stitched up to close it up.
It takes 4 to 9 months for the bone material to fuse with your jaw.