4种常用口腔金属材料MRI伪影对比研究

MRI Artifacts of Four Commonly Used Dental Metal Materials:A Comparative Study

目的:比较4种不同口腔金属材料在MRI检查中伪影大小。方法:在标准备牙模型上制作钴铬合金、纯钛、银钯、金钯金属全冠实验组以及二氧化锆全瓷冠对照组,并用25cm×13cm×10cm(长×宽×高)塑料容器蒸馏水包埋后放置于1.5T自旋回波序列T2加权像比较伪影大小。结果:不同金属在同一自旋回波序列中产生伪影大小不同,钴铬合金、纯钛、银钯金属冠的伪影分别为(450±665)、(343±322)、(141±186)mm2,3组间两两比较均存在差异(P<0.05),金钯金属冠与对照组二氧化锆相比伪影大小未见明显差异。结论:4种金属MRI检查中伪影的大小钴铬合金>纯钛>银钯合金>金钯合金。

Objective：To compare the MRI artifacts of four different dental metal materials,providing clinical evidence for prosthodontic doctors.Methods：Full crowns of Co-Cr alloy,pure titanium,silver palladium,and gold palladium were made according to a standard model.Full crown of zirconium dioxide was taken as control.All crowns were embedded in a 13 cm × 25cm×10cm（length x width x height）plastic container filled with distilled water.Artifacts were compared on the T2-weighted images in 1.5Tspin echo sequences.Results：Different materials showed different artifacts in the same spin echo sequence.Artifacts of Co-Cr alloy,pure titanium,silver palladium crownswere（450±665）,（343±322）,（141±141）respectively.There were significant differences between them（P0.05）.There was no significant difference between gold palladium group and zirconium dioxide group.Conclusion：MRI artifacts of the four materials in descending order were as follows：Co-Crpure titaniumsilver palladiumgold palladium.