Sinus Lift- Healing of Sinus Grafts- the sinus (maxillary) is a naturally occurring space in the upper jaw. It is a size of a pea when you are born on the side of your nose, as the face grows, the sinus grows. Sometimes it takes up most of the space in the back of the upper jaw.
But it is hole in the jaw. The body cant see this hole because of the sinus lining. We only have to lift the sinus lining and place something underneath it to keep the space open, and the body will form bone as it does in an extraction socket. Nobody has discovered what it is there for..