2种低贵金属合金在MRI影像中伪影的评价  

Assessment on MRI artifacts of two low noble metal alloys

作　　者：苏葵[1] 肖学红[2] 方铁钧[1] 狄丽莎[1] 

机构地区：[1]中山市人民医院口腔分院特诊科,广东中山528400 [2]中山市人民医院磁共振室,广东中山528400

出　　处：《口腔医学》2015年第11期921-924,共4页Stomatology

摘　　要：目的探讨两种口腔修复用低贵金属合金对磁共振成像的影响。方法制取右下第二前磨牙全冠预备体的超硬石膏模型,使用银钯合金、金钯合金、钴铬合金、氧化锆分别制作烤瓷冠及全瓷冠,每种8个样本,于体外实验模型中进行磁共振成像检测,对产生的金属伪影进行测量,SPSS 16.0统计软件进行分析。结果 4种材料在GRE序列中都形成明显伪影,冠结构均基本不能分辨。SE、TSE序列中,钴铬合金形成伪影面积较银钯、金钯合金、氧化锆组大,且差异具有统计学意义。银钯合金与金钯合金伪影面积差异无统计学意义。结论行MRI检查时,银钯合金和金钯合金在SE、TSE序列中形成的伪影面积轻微,值得临床推荐。Objective To study the influence of two low noble metal alloys for dental restorations on MRI. Methods Anhydrite model for full crown preparation of low right second premolar was prepared. Porcelain-fused-to-metal（ PFM） crown and ceramic crown were made from silver-palladium（ Ag-Pd）,gold-palladium（ Au-Pd）,cobalt-chrome（ Co-Cr） and zirconia,with 8 samples for each type. The samples were subjected to magnetic resonance imaging（ MRI） examination. The areas of MRI artifacts were measured and then analyzed with SPSS16. 0 Statistic Software. Results Conspicuous artifacts were found in all the materials in GRE sequence,and crown structures could hardly be discriminated. In SE and TSE sequences,the artifact area in Co-Cr PFM crown was larger than that in Ag-Pd and Au-Pd PFM crowns,and the difference was statistically significant. Besides,the difference of artifact areas between Ag-Pd and AuPd PFM crowns demonstrated no statistical significance. Conclusions There are no conspicuous MRI artifacts of Ag-Pd and Au-Pd PFM crowns in SE and TSE sequences,which is preferable in clinic.

关 键 词：磁共振成像 伪影 贵金属 

分 类 号：R783.1[医药卫生—口腔医学]