[VadeRetro]

MRI isn't supposed to have much of an effect on non-ferrous metals such as titanium or dental fillings, though.

You may have just posted the answer to my question. There are a lot of gold crowns and more than a few titanium jaw implants out there. I was having trouble beleiving we who have such can't be MRI'ed.

[aruanan]

Here's what Mayo said. I think the "may" may have something to do with the metal being able to be magnetized.

Tell the technologist if you have any metal or electronic devices in your body, such as metallic joint prostheses, artificial heart valves, implanted electronic devices, cochlear implants or magnets in your dentures. The presence of metal in your body may be a safety hazard or affect a portion of the MRI image.