Magnetic Resonance Imaging (MRI) is a non-invasive diagnostic tool that uses strong magnetic fields and radio waves to create detailed images of internal body structures. Braces are orthodontic devices that gradually move teeth into alignment.
MRI Safety with Braces
Having braces does not prevent you from undergoing an MRI scan. Most modern braces are safe for MRI procedures, as their materials are typically non-ferrous and not strongly attracted to the machine’s powerful magnets. However, considerations exist regarding image quality and potential heating.
The primary concern with metal braces during an MRI is image artifacts, which are distortions that can appear on the scan. These occur because the metal interacts with the MRI’s magnetic field, making images difficult to interpret, especially for head, neck, or brain scans. Radiologists can often adjust scan parameters or use different imaging angles to minimize these distortions.
Another concern is the heating of metal components due to the MRI machine’s strong magnetic fields and radiofrequency energy. While some patients might experience a slight warming sensation, studies indicate the temperature increase is typically minimal and not harmful. Research shows the temperature increase for brackets and wires during MRI is clinically insignificant, with studies indicating a minimal rise.
Factors Influencing MRI Scans with Braces
Several factors influence the interaction between braces and an MRI scan, including the type of orthodontic appliance and the specific body part being imaged. Traditional metal braces, made from stainless steel or titanium alloys, are MRI-safe but can cause image distortions. These alloys are non-ferrous and not strongly magnetic.
Ceramic braces, made from non-metallic materials, pose less of an issue and are safe for MRIs. Clear aligners, such as Invisalign, are also safe. Removable aligners are typically removed before the scan, eliminating interference.
The MRI scan’s location significantly impacts whether braces affect imaging results. Head and neck scans are most susceptible to image artifacts due to brace proximity. However, for body parts far from the head, such as a knee, ankle, or lower back, braces generally do not affect image quality. The MRI machine’s magnetic field strength, measured in Tesla (T), also plays a role; higher field strengths (e.g., 3T) might produce more noticeable artifacts than lower strengths (e.g., 1.5T).
Preparing for an MRI When You Have Braces
Always inform your referring doctor and the MRI facility staff that you have braces before your scan. This allows them to consider any impact on image quality and adjust scan parameters as needed.
Consult with your orthodontist about your upcoming MRI. They can provide information about your braces’ materials and offer guidance. In rare instances, particularly for detailed brain or facial imaging, an orthodontist might consider temporarily removing certain components, but this is uncommon and requires professional assessment.
During the scan, the MRI team will take precautions to minimize issues. They are accustomed to imaging patients with various medical devices and will guide you through the process, prioritizing your comfort and safety.