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放射治疗是一种治疗头颈部癌的有效方法,但临床及实验研究表明放射治疗可能影响牙齿及颜面的生长发育。这种影响取决于以下因素:(1)病人的年龄和发育阶段;(2)射线的强度;(3)射线的总剂量;(4)射线的波长;(5)病人对照射的敏感性;(6)肿瘤对照射的敏感性;(7)组织的血供及营养状况;(8)肿瘤累及的范围。处于发育阶段的牙齿对放射线特别敏感,放射引起的牙齿损害也多种多样。一定量的放射线能使骨组织的形成、吸收之间的平衡失调,引起骨的畸形,
Radiation therapy is an effective treatment of head and neck cancer, but clinical and experimental studies show that radiation therapy may affect the growth of teeth and face. This effect depends on the following factors: (1) the patient's age and stage of development; (2) the intensity of the radiation; (3) the total dose of radiation; (4) the wavelength of the radiation; (6) tumor sensitivity to radiation; (7) tissue blood supply and nutritional status; (8) the extent of tumor involvement. Teeth in developmental stage are particularly sensitive to radiation, and tooth damage caused by radiation is also varied. A certain amount of radiation can make the formation of bone tissue, imbalance between absorption imbalance, causing bone deformity,