头颈部恶性肿瘤应用放射治疗已趋普及。由射线引起放射性颌骨坏死及其继发的放射性颌骨骨髓炎 ,近年来有增多的趋势。颌骨放射性坏死 (骨髓炎 )发生后 ,病期漫长 ,治疗困难 ,给病员带来很大的痛苦。因此选择放射治疗头颈部恶性肿瘤 ,应采取适当的预防措施 ,可避免发生此病和降 Head and neck cancer application of radiotherapy has become popular. Radiation caused by radioactive jaw necrosis and its secondary radioactive jaw osteomyelitis, there is an increasing trend in recent years. Jaw radiation necrosis (osteomyelitis) occurs after a long period of time, the treatment is difficult, to bring great pain to the patient. Therefore, the choice of radiotherapy for head and neck cancer, should take appropriate preventive measures to prevent the disease and reduce