Magnetic Resonance Imaging (MRI) is a common diagnostic tool used to create detailed images of the body’s internal structures. If you have dental fillings, you may wonder whether they pose any risk during an MRI scan. The good news is that most modern dental fillings are safe for MRI, but there are some considerations to keep in mind.
In this article, we’ll explore the safety of dental fillings during an MRI, the types of dental materials used, and what to expect when undergoing an MRI with dental work.
What Happens During an MRI?
MRI scanners use powerful magnetic fields and radio waves to generate detailed images of soft tissues, organs, and bones. Since an MRI relies on strong magnets, any metal in your body could potentially interact with the magnetic field. This is why patients are asked to remove metal objects such as jewellery, watches, and piercings before the scan.
For individuals with dental fillings, the concern is whether the metal in the fillings can be affected by the MRI machine.
Are Dental Fillings Affected by MRI Scans?
Most dental fillings are safe for MRI scans. However, the interaction between dental work and the MRI depends on the type of material used in the filling. Here’s a closer look at common dental filling materials and their MRI compatibility:
1. Composite (Tooth-Colored) Fillings
- Made of resin and glass or ceramic particles
- Completely non-metallic and MRI-safe
- Do not interfere with MRI scans
2. Amalgam (Silver) Fillings
- Contains a mix of metals, including mercury, silver, tin, and copper
- Non-magnetic, but may cause minor image distortions in MRI scans of the head or jaw
- Generally considered safe for MRI, though rare cases of mild heating or distortion have been reported
3. Gold Fillings and Crowns
- Made of gold alloy, which is non-magnetic
- Do not pose safety risks during an MRI
- May slightly affect image clarity, but not enough to cause major concerns
4. Ceramic and Porcelain Fillings
- Completely non-metallic and MRI-compatible
- Ideal for patients concerned about metal interactions
5. Titanium Dental Implants and Crowns
- Used in some crowns, implants, and bridges
- Considered MRI-safe because titanium is non-magnetic
- Does not interfere with MRI scans
Can Dental Fillings Cause MRI Complications?
For most people, dental fillings do not cause any issues during an MRI scan. However, in rare cases, older metal fillings or large metallic restorations may:
- Distort MRI Images:
Some metallic fillings, especially amalgam, can create small distortions in MRI images of the head or jaw. This effect is called an “artifact,” but it rarely affects diagnosis.
- Mild Heating:
Some metal dental restorations may conduct heat slightly, but the temperature increase is usually minimal and not enough to cause discomfort or harm.
- Magnetic Pull (Rare Cases):
While most dental fillings are non-magnetic, older metal restorations with unknown compositions could be affected by the MRI’s magnetic field. However, this is extremely uncommon.
Precautions to Take Before an MRI with Dental Fillings
If you have dental fillings or other dental restorations, follow these steps to ensure a safe MRI experience:
- Inform Your Radiologist and Dentist:
Before your MRI, let your healthcare provider know about any dental work you have. If needed, they can assess whether it might affect the scan.
- Provide Dental Records:
If you have older dental fillings, ask your dentist for information about the materials used.
- Follow MRI Safety Guidelines:
Remove all removable dental appliances such as dentures, retainers, or partials with metal components before the scan.
Should You Replace Metal Fillings Before an MRI?
In most cases, there is no need to replace your metal fillings before an MRI scan. However, if you are planning to replace old fillings for cosmetic or health reasons, you may consider composite or ceramic fillings, which are completely MRI-safe and do not cause image distortions.
Generally Safe for MRI Scans
Dental fillings, including amalgam, composite, gold, and ceramic fillings, are generally safe for MRI scans. While some metal fillings may cause minor image distortions, they do not pose serious health risks. If you have concerns about your dental fillings before undergoing an MRI, consult with your dentist and radiologist for reassurance.
As a trusted dentist, we offer safe and modern dental treatments in Surrey Hills and surrounding suburbs like Box Hill and Balwyn. They include composite and ceramic fillings that are fully MRI-compatible. Book an appointment today to discuss your dental care needs and ensure long-term oral health.
