Effect of dental restorations and prostheses on radiotherapy dose distribution: a Monte Carlo study
Effect of dental restorations and prostheses on radiotherapy dose distribution: a Monte Carlo study
复制标题
DOI：
10.1120/jacmp.v10i1.2853
复制
发表时间：
2009-01-01
影响因子：
2.1
通讯作者：
Court, Laurence E.
中科院分区：
文献类型：
--
作者：
Chin, David W. H.;Treister, Nathaniel;Court, Laurence E.
由于所用材料的原子序数高，牙科修复、固定修复和植入物影响头颈部放射治疗中的剂量分布。由于撞击治疗X射线，来自金属材料的电子的反向散射导致局部剂量增强。这些剂量的增加会导致牙科患者局部粘膜炎，这是一种重要的临床并发症。我们使用EGS4nrc Monte Carlo（MC）模拟系统研究了23种牙科工作配置的后向散射效应。我们发现，全金属固定局部义齿引起的剂量增加量最高，高达33%，而银汞合金修复并没有引起显着的量。陶瓷贴面修复引起高达8%的增强。在3 mm和5 mm之间的水当量材料几乎完全吸收了反向散射。MC模拟提供了一个准确的估计后向散射剂量，并可能在未来提供患者特定的估计。
Dental restorations, fixed prosthodontics, and implants affect dose distribution in head and neck radiation therapy due to the high atomic number of the materials utilized. The backscatter of electrons from metallic materials due to the impinging treatment x-ray results in localized dose enhancements. These dose enhancements cause localized mucositis in patients who have dental work, a significant clinical complication. We investigated the backscatter effect of 23 configurations of dental work using the EGS4nrc Monte Carlo (MC) simulation system. We found that all-metal fixed partial dentures caused the highest amount of dose enhancement-up to 33%-while amalgam restorations did not cause a significant amount. Restorations with a ceramic veneer caused up to 8% enhancement. Between 3 mm and 5 mm of water-equivalent material almost completely absorbed the backscatter. MC simulations provide an accurate estimate of backscatter dose, and may provide patient-specific estimates in future.