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I have a patient with implants in her mandible which are used to retain an overdenture. She is schedule to have an MRI and her doctor asked if it was safe to do the MRI with the implants in her mandible. I told her that since there are no abutments (Locators) placed yet, there are only titanium implants which (hopefully) is safe in the strong magnetic field. Then I remembered the cover screw which I imagine is not titanium. So I offered to remove the cover screws (the tops of the implants are exposed at the level of the gingiva) when she goes for the MRI and immediately afterward we can torque down the Locator abutments. What do you recommend I tell her doctor and how should I manage this case? what materials are safe and unsafe in MRI environments?