When considering where to place dental implants, cases where there has been excessive bone loss or a lot of time has passed since the loss of teeth may lead to narrow and then of the remaining ridge of bone to properly secure any implants.

In these situations bone must be added as a separate procedure prior to placing the implants. The bone is added, stabilized with the membrane and time is given for the bone graft to integrate. After integration of the new bone implants may be placed.