If you are planning on getting any kind of dental implant, bone grafting is part of the process. Whenever a dental device is implanted into the jawbone, the bone must be built up in order to stabilize any restoration devices used. The grafting comes from bone samples provided by the patient. The bone sample will be removed when dental drilling in another area if the mouth. It is an automatic process where tiny fragments of the bone get suctioned up out of the mouth to be used for grafting. If this process is not successful then it is common, safe and sanitary to use cadaver bone fragments for grafting. There are actual bone banks, much like blood banks, where harvested bone fragments are processed and stored for use.