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首页> 外文期刊>The Journal of Prosthetic Dentistry >Evaluation of a device for attenuation of electron release from dental restorations in a therapeutic radiation field.
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Evaluation of a device for attenuation of electron release from dental restorations in a therapeutic radiation field.

机译：在治疗性辐射场中，用于减少牙齿修复体释放电子的装置的评估。

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Statement of Problem. For some patients, radiation treatment is a part of tumor therapy in the head and neck area before and/or after surgery. The oral cavity and teeth are thereby frequently exposed to high doses of radiation. In this situation, electronic backscatter from dental materials may damage the surrounding soft tissue. Purpose. This study determined the degree of absorption and the backscatter effect of therapeutic radiation used in the presence of 4 different dental materials. The efficacy of a protective stent also was investigated. Material and Methods. The influence of 4 dental materials (a high-gold alloy, pure titanium, amalgam, and a synthetic material) on radiation dose distribution was tested on 2 test models that simulated the presence of teeth. An alanine dosimeter was used to make measurements with and without the presence of a protective stent. To verify the results, one of the test models was compared to a computer simulation. Results. Backscatter effects on the surface of dental materials caused an increase of up to 170% of the radiation dose measured without the materials. The rate of overdose increased with the atomic number of the dental material. The extent of the backscatter effect was a maximum of 4 mm. Conclusion. The considerable overdose of 170% found in this study suggests that soft tissue surrounding dental restorations should be protected from radiation. The backscatter results indicate that soft tissue could be effectively shielded with a 3-mm synthetic stent.
机译：问题陈述。对于某些患者，放射治疗是手术前后头部和颈部肿瘤治疗的一部分。因此，口腔和牙齿经常暴露于高剂量的辐射下。在这种情况下，牙科材料产生的电子反向散射可能会损坏周围的软组织。目的。这项研究确定了在4种不同牙科材料存在下使用的治疗性辐射的吸收程度和反向散射效应。还研究了保护性支架的功效。材料与方法。在2个模拟牙齿的测试模型上测试了4种牙科材料（高金合金，纯钛，汞合金和合成材料）对辐射剂量分布的影响。在有或没有保护性支架的情况下，使用丙氨酸剂量计进行测量。为了验证结果，将其中一个测试模型与计算机仿真进行了比较。结果。牙科材料表面的反向散射效应导致在不使用牙科材料的情况下测得的辐射剂量增加了多达170％。过量的剂量随牙科材料的原子序数增加。反向散射效应的范围最大为4毫米。结论。在这项研究中发现170％的过量用药表明，应该保护牙齿修复体周围的软组织免受辐射。反向散射结果表明，可以用3毫米合成支架有效地屏蔽软组织。

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