Bone grafting is a surgical procedure that replaces missing bone with a framework of material into which these cells can enter and start the rebuilding process. Over time the patient's cells will remodel the graft material into his/her own functioning bone. Bone grafting material may come from several sources. Autograft bone material containing the patient's own cells is taken from another point in the patient's body and transplanted to the desired site. It is a good graft material since it carries no risk of disease transmission. The chief drawbacks are that it requires a second surgical procedures and enough harvestable bone that may not be easily available. Allograft bone is material that was taken from an organ donor and processed to ensure its safety and improve the handling characteristics. The advantages of allograft bone are that it is readily available and does not require a second surgical site. Allograft bone has been well documented in clinical trials and has an excellent safety record.