三种烤瓷合金材料对磁共振成像的影响

Influences of Three Types of Dental Ceramic Alloys on Magnetic Resonance Imaging

目的观察3种烤瓷合金材料对磁共振成像(MRI)的影响。方法选择镍铬合金、钴铬合金和钛合金3种材料,采用计算机辅助设计制造设备加工成3个形状、大小完全相同的︳_3_-5三单位固定桥基底冠,分别固定于同一志愿者口腔内相同位置进行MRI头部扫描,同时将其固定于水模上扫描,比较伪影大小。结果 3种合金均可在MRI影像上产生明显伪影,MRI影像伪影影响大小程度依次为钴铬合金>镍铬合金>钛合金。结论钛合金对MRI的影响明显小于镍铬合金和钴铬合金。

Objective To observe the influence of three types of dental ceramic alloys on magnetic resonance imaging(MRI).Methods Ni-Cr alloy,Co-Cr alloy,and Ti alloy were elaborated into three crowns with the same shape and size by computer aided design,computer aided manufacturing device.Afterwards we fixed the crown in the mouth of a volunteer at the same location separately.Then we scanned them with MRI.The extents of artifacts were compared.Results All these alloys caused MR artifacts.The extent of the artifact of Co-Cr alloy was larger than those of Ni-Cr alloy and Ti alloy under MRI.Conclusion Ti alloy has the smallest influence on MRI than Ni-Cr alloy and Co-Cr alloy.