口腔修复体MRI伪影最佳实验样本的筛选  

Study on best test samples of MRI artifacts caused by oral prostheses

作　　者：魏斌[1] 胡艳艳[1] 余强[2] 骆一西[1] 张富强[1] 

机构地区：[1]上海交通大学医学院第九人民医院口腔医学院口腔修复科上海市口腔医学重点实验室上海市口腔医学院研究所 [2]上海交通大学医学院第九人民医院放射科,上海200011

出　　处：《上海交通大学学报（医学版）》2008年第11期1353-1355,共3页Journal of Shanghai Jiao tong University:Medical Science

基　　金："十一五"国家科技支撑计划重点项目(2007BAI18B05);上海市重点(特色)学科建设项目(T0202);The Eleventh Five Year Plan National~~

摘　　要：目的探讨用于口腔修复体MRI伪影研究的最佳实验样本类型。方法使用镍铬合金和86.2%金合金分别制作三类实验样本,即原材料模块及铸造后模块、冠,每一类各制作3个样本。样本分别置于体外实验模型中进行磁共振成像(MRI)检测,对产生的MRI伪影进行测量,SAS 8.2统计软件进行比较分析。结果镍铬合金原材料模块及铸造后模块、冠所产生的MRI伪影面积分别为543～17 177、110～5 050、1 188～17 456像素;86.2%金合金原材料模块及铸造后模块、冠所产生的MRI伪影面积分别为396～5 267、151～1 271、213～1 126像素。经团体t检验分析,镍铬合金和86.2%金合金的原材料模块引起的MRI伪影面积均显著大于铸造后模块(P<0.01);镍铬合金冠产生的MRI伪影面积显著大于铸造后模块(P<0.01)。结论铸造前后的修复体样本产生的MRI伪影存在显著差异;样本的外观形态对MRI伪影的影响不确定。建议进行MRI伪影评估时,为保证结果的可靠性应选择临床真实的修复体作为实验样本。Objective To investigate the best test samples of MRI artifacts caused by oral prostheses. Methods Three kinds of test samples were prepared with Ni-Cr alloy and 86.2% -Au alloy, and 3 raw material modules, cast modules and crowns were made, respectively. The samples were subjected to magnetic resonance imaging（ MRI） examinations. The areas of MRI artifacts were measured, and SAS 8.2 statistic software was employed for analysis. Results The areas of MRI artifacts caused by Ni-Cr alloy raw material modules, cast modules and crowns were 543 to 17 177 pixels, 110 to 5 050 pixels and 1 188 to 17 456 pixels, respectively, and those caused by 86.2%-Au raw material modules, cast modules and crowns were 396 to 5 267 pixels, 151 to 1 271 pixels and 213 to 1 126 pixels, respectively. The areas of MRI artifacts caused by Ni-Cr alloy and 86.2% -Au raw material modules were significantly larger than those caused by cast modules（P 〈 0.01 ）. The areas of MRI artifacts caused by Ni-Cr crowns were significantly larger than those caused by cast modules （ P 〈 0.01）. Conclusion There are significant differences in the areas of MRI artifacts caused by oral prostheses before and after cast. It is uncertain whether the appearance of samples could affect the areas of MRI artifacts. It is suggested that real prostheses in clinics should be chosen as samples for evaluation of MRI artifacts in order to assure the reliability of results.

关 键 词：牙科金属 修复体 磁共振成像 伪影 样本 

分 类 号：R783.1[医药卫生—口腔医学] R783.4[医药卫生—临床医学]