Dental implants can be subjected to MRI because the implants implanted in the bone are usually made of a titanium alloy that is close to pure titanium, so basically they have no significant effect on the magnetic field of MRI. However, there are various options for the material of the crown, which can be all-ceramic, cobalt-chromium porcelain or nickel-chromium porcelain, etc. Among them, nickel, cobalt, iron and chromium are all magnetic, so they may interfere with the magnetic field and affect the accuracy of the MRI examination. However, it is not that the examination cannot be done, that is, the oral local may form artifact interference. This may result in poorly seen local images and inability to accurately assess the condition. If you wish to exclude these effects, patients can choose all-porcelain or precious metal porcelain materials when making crowns to avoid the MRI interference caused by porcelain teeth.