[The in-vivo determination of dosage intensification due to dental alloys in the therapeutic irradiation of the oral cavity].
[The in-vivo determination of dosage intensification due to dental alloys in the therapeutic irradiation of the oral cavity].
复制标题
[口腔治疗辐射中牙科合金剂量强化的体内测定]。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
H. Böttcher
中科院分区：
文献类型：
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作者：
C. Thilmann;I. Adamietz;R. Rahn;S. Mose;F. Saran;B. Schopohl;H. Böttcher
背景
在口腔区域的治疗性照射过程中，可以观察到由于牙科材料附近的二次电子发射而导致的剂量增加。这可能导致与金属牙冠和填充物接触的粘膜局部破坏。到目前为止，只能借助使用模型进行的测量对这一剂量增加作出粗略的估计。
患者和方法
本文报告了11例口腔金属材料在60Co γ射线治疗照射中，其周围剂量增加的程度。测量进行了热释光剂量学在永久固定的金牙和合金标本含有金和钯和汞合金。
结果
根据同时测量的参考值，在不同牙科材料的表面处测量以下相对剂量值：在固定金冠附近为161%，在含高百分比金的样品附近为168%，在钯样品附近为133%，在汞合金样品附近为161%。
结论
在体内测量的剂量增加，由于金属假牙是小于使用背散射装置照射体模获得的值。尽管如此，它们可能具有临床意义。因此，在用60Co照射期间使用粘膜保护，作为防止口腔粘膜局部损伤的手段，由于治疗体积内的牙科合金，仍然不可避免。
BACKGROUND
In the course of therapeutic irradiation of regions in the mouth cavity dosage increase due to the emission of secondary electrons in the vicinity of dental materials can be observed. This could induce local destruction of the mucous membrane in contact with metallic dental crowns and fillings. As at now, only rough estimates of this dosage increase could be made with the help of measurements carried out with models.
PATIENTS AND METHODS
The degree of dosage increase in the immediate surrounding of metallic dental material was measured in an in-vivo study during therapeutic irradiation with 60Co gamma rays in the area of mouth cavity of 11 patients. Measurements were carried out by thermoluminescent dosimetry at permanently fixed golden teeth and alloy specimens containing gold and palladium and amalgam.
RESULTS
The following relative dosage values according to a simultaneously measured reference value were measured at the surface of the different dental materials: 161% near fixed golden caps, 168% near the specimen containing gold in a high percentage, 133% near the specimen of palladium and 161% near the specimen of amalgam.
CONCLUSION
The in vivo measured dosage increases due to metallic dental prosthesis are less than values obtained using back scatter arrangements for irradiating phantoms. Despite this, they could be of clinical relevance. Thus the usage of a mucous membrane protection during irradiation with 60Co, as a means of preventing local lesions of the oral mucosa, due to dental alloys within the treatment volume remains inevitable.