The word “necrosis” originates from the Greek word νέκρωσης, which refers to the act of death or decay. In the English language, necrosis is the result of cell injury that causes the premature death of living tissue cells via autolysis, or in simpler terms, the death of body tissue. When too little oxygenated and nutrient-rich blood reaches tissue, it begins to go through autolysis, or the process of self-digestion by its own enzymes. Necrosis can be caused by exposure to chemicals, radiation, and injury, and cannot be reversed. Once begun, tissue death can only be stopped — the destroyed tissue won’t regenerate without the help of a grafting procedure. In implant dentistry, necrosis of the jaw is a common obstacle to implant procedures. Tooth loss, periodontal disease, and other conditions can cause or contribute to the loss of bone in the jaw. A bone graft may be needed to support an implant.