Dirican Bahar, Ozen Julide, Beyzadeoglu Murat, Oysul Kaan, Surenkok Serdar, Sipahi Cumhur
Department of Radiation Oncology, Gulhane.
Int J Prosthodont. 2006 Sep-Oct;19(5):462-6.
To determine the optimal thickness of protective oral radiation shields composed of an acrylic resin stent and a lead shield, which are used in head and neck radiotherapy to minimize undesired normal tissue radiomorbidity.
Intraoral acrylic resin stents and lead shields of different thicknesses were inserted into a specially designed human mandible phantom with thermoluminescent lithium fluoride dosimeter chips (TLD-100) placed on the buccal and lingual sites and exposed to irradiation of different energies. Fifty-cGy irradiation was performed and TLD-100 dose measurements were obtained for each irradiation type, acrylic resin stent thickness, and lead shield thickness.
Acrylic resin stents with a 2-mm lead shield reduced 20% and 15% of the normal tissue dose for Co-60 and 6 MV X photon radiations, respectively, whereas the stents with a 4-mm lead shield achieved a higher reduction of the normal tissue dose (30% and 23% for Co-60 and 6 MV X photons, respectively).
In protective oral radiation shields, acrylic resin stent thickness has little effect on the reduction of normal tissue dose, but lead shield thickness significantly effects the reduction of normal tissue dose.
确定由丙烯酸树脂支架和铅屏蔽组成的口腔辐射防护屏蔽的最佳厚度，该屏蔽用于头颈放疗，以尽量减少正常组织不必要的放射性损伤。
将不同厚度的口腔丙烯酸树脂支架和铅屏蔽插入专门设计的人体下颌骨模型中，在颊侧和舌侧放置热释光氟化锂剂量计芯片（TLD-100），并对其进行不同能量的照射。进行50 cGy的照射，并针对每种照射类型、丙烯酸树脂支架厚度和铅屏蔽厚度获得TLD-100剂量测量值。
带有2 mm铅屏蔽的丙烯酸树脂支架分别使钴-60和6 MV X光子辐射的正常组织剂量降低了20%和15%，而带有4 mm铅屏蔽的支架使正常组织剂量降低得更多（钴-60和6 MV X光子分别为30%和23%）。
在口腔辐射防护屏蔽中，丙烯酸树脂支架厚度对正常组织剂量的降低影响不大，但铅屏蔽厚度对正常组织剂量的降低有显著影响。
