The metal/tissue interface effect in irradiation of the oral cavity.
The metal/tissue interface effect in irradiation of the oral cavity.
复制标题
口腔照射中的金属/组织界面效应。
作者：
F. Gibbs;B. Palos;D. Goffinet
金属假牙或覆盖物可能会导致在口腔的强烈照射期间邻近组织表面的粘膜反应增加。通过用4-和6-MeV光子照射牙科模型来研究这种现象的剂量学。金和汞合金界面可能产生高达150-170%的局部粘膜剂量取决于光束的几何形状，但剂量的111-126%的金冠和汞合金填充物约109-118%，发现对射束配置。2-4 mm的组织等效吸收体足以重新建立均匀的剂量分布，并且当不需要拔牙时，应在整个治疗过程中使用。讨论了每天使用一个场的对射束治疗中界面效应的放射生物学夸张。
Metal dental prostheses or overlays may lead to increased mucosal reactions of adjacent tissue surfaces during intensive irradiation of the oral cavity. The dosimetry of this phenomenon was investigated by irradiating dental phantoms with 4-and 6-MeV photons. Gold and amalgam interfaces may produce local mucosal doses as high as 150-170% depending on the beam geometry, but doses of 111-126% for gold crowns and about 109-118% for amalgam fillings were found for opposed-beam configurations. 2-4 mm of tissue-equivalent absorber is sufficient to re-establish a homogeneous dose distribution and should be employed throughout therapy whenever dental extraction is unwarranted. The radiobiological exaggeration of the interface effect in treatment with opposed beams using one field per day is discussed.