Magnetic Resonance Imaging (MRI) is a commonly used diagnostic tool. Patients with metal dental restorations often express concern regarding the safety of MRI scans. Understanding the interaction between MRI and dental crowns helps clinicians reassure patients and plan imaging appropriately.
Are Metal Dental Crowns MRI-Safe?
Most commonly used dental crowns—such as gold alloys, cobalt-chromium, nickel-chromium, and stainless steel crowns—are non-ferromagnetic and are considered MRI-safe. These restorations do not move or heat up during the scan and generally pose no risk to the patient.
Possible MRI Artefacts
While safety is not an issue, metal crowns may cause image distortion (artifacts), especially during:
MRI of the brain
Head and neck
Maxillofacial region
MRI scans of areas away from the oral cavity (spine, abdomen, pelvis, extremities) are usually unaffected.
Dental Implants and Orthodontic Appliances
Titanium dental implants are MRI compatible.
Orthodontic brackets and wires are safe but may significantly interfere with head and facial imaging and are sometimes removed before scanning.
Clinical Recommendations
Patients should inform the radiology team about any dental restorations.
Removal of crowns is not required.
Extra caution is advised if the crown is very old or loose, though complications are rare.
Conclusion
Metal dental crowns are generally safe during MRI procedures. The primary concern is imaging artefact rather than patient safety. Proper communication between the patient, dentist, and radiologist ensures optimal imaging outcomes without unnecessary anxiety.
MBH/AB