Using the patient's own bone is called an autogenous bone graft. This means that at the time of surgery, the doctor makes an incision and takes a small piece of bone from an area of the mouth where it is not needed. In most cases, the bone is taken from a tooth extraction site. Autogenous bone grafting has excellent fusion rates and has become the standard by which all other biologics are measured. Many doctors prefer autogenous bone grafts because there is no risk of the body rejecting the graft since it came from the patient's own body.