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Ancient dental crowns. Better to replace before risking MRI?

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While most available info on the Web suggests there should be no physical harm in having an MRI, even with very old dental crowns, the ones I have date from the 1980-90s. So around 40 years old. Some will almost certainly have traces (or more) of ferromagnetic materials (Iron, cobalt, nickel) used to strengthen the crown. The available literature and recommendations seem to apply to newer crowns, which don't use those materials. There is the odd case report of old dental crowns moving and in one case getting pulled right out of the patient's mouth by the magnets.

Anyone with experience of having an MRI with ancient dental crowns?

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