Are Metal Crowns Safe in an MRI? What Dental Patients Need to Know

Introduction

If you have been told you need an MRI scan and you have metal dental crowns, it is entirely natural to wonder whether this could cause a problem. Many patients search online with questions such as "are metal crowns safe in an MRI?" — and it is a sensible concern to explore before your appointment. Understanding the relationship between dental restorations and magnetic resonance imaging can help you feel more informed and prepared.

Metal dental crowns have been used reliably in dentistry for many decades. They remain a common restoration for damaged or root-treated teeth. However, as MRI technology becomes increasingly routine in medical care, patients with dental metalwork are understandably seeking clarity about safety, comfort, and what they need to disclose before a scan.

This article explains how metal crowns interact with MRI machines, what types of metals are typically used in dental crowns, and when you should speak to both your dentist and your medical team before undergoing an MRI scan.

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Featured Snippet: Are Metal Crowns Safe in an MRI?

Are metal crowns safe in an MRI scan?

In most cases, metal dental crowns are considered safe during an MRI scan. The alloys commonly used in dental crowns are generally non-ferromagnetic, meaning they are not significantly attracted to magnetic fields. However, some crowns may cause minor image distortion near the scan site. Always inform your radiographer and medical team about any dental metalwork before your scan.

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What Are Metal Dental Crowns Made From?

Understanding what is inside a metal dental crown helps explain how it behaves during an MRI scan. Dental crowns described as "metal" are not usually made from a single pure metal. Instead, they are constructed from various metal alloys chosen for their durability, biocompatibility, and clinical performance.

The most common materials found in metal dental crowns include:

• Base metal alloys — typically nickel-chromium or cobalt-chromium, widely used for their strength and cost-effectiveness
• Precious metal alloys — containing gold, platinum, or palladium, often preferred for their excellent biocompatibility
• Porcelain-fused-to-metal (PFM) crowns — which have a metal substructure beneath a tooth-coloured ceramic outer layer

The key factor relevant to MRI safety is whether the metal alloy is ferromagnetic — that is, whether it is attracted to a strong magnetic field. Most dental alloys used in modern crowns are composed of materials that are either non-magnetic or only very weakly magnetic. Gold, titanium, and most cobalt-chromium alloys fall into this category.

Older crowns, or crowns containing certain iron-based alloys, may carry slightly different properties. This is why accurate disclosure of your dental history to your medical and radiology team is important.

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How Does an MRI Machine Interact With Metal?

MRI (Magnetic Resonance Imaging) uses a powerful magnetic field and radio waves to produce detailed images of the body's internal structures. Unlike X-rays, it does not use ionising radiation. However, the strength of the magnetic field — typically measured in Tesla units — means that certain metals can be affected.

There are two primary concerns with metal and MRI:

1. Magnetic attraction (ferromagnetism) Strongly ferromagnetic metals can be pulled towards the MRI magnet, which could pose a safety risk if the metal object were able to move. This is the primary reason why patients with certain surgical implants, pacemakers, or metallic fragments are assessed very carefully before scanning.

2. Image artefacts Even metals that are not meaningfully attracted to the magnet can cause distortion in the MRI image. This is known as a susceptibility artefact — a blurring or shadowing effect in the image around the metal object. This is particularly relevant if the scan is of the head, neck, or jaw region, where a dental crown may interfere with image clarity.

For dental crowns specifically, the risk of physical movement is generally considered very low due to the non-ferromagnetic nature of most dental alloys. Image distortion, however, remains a relevant clinical consideration depending on the body part being scanned.

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Clinical Explanation: Why Dental Alloys Generally Behave Differently to Surgical Metals

The dental profession has long recognised the importance of using biocompatible materials that do not interfere with the body's normal functions. The alloys selected for dental crowns are carefully chosen not only for their strength and longevity but also for their stability within the oral environment.

From a physics standpoint, ferromagnetism — the property that causes metals to be strongly attracted to magnets — depends on the atomic structure of the material. Iron, nickel, and cobalt in certain configurations exhibit this property strongly. However, the specific alloys used in dentistry are typically engineered and processed in ways that significantly reduce ferromagnetic behaviour.

For example, cobalt-chromium alloys, commonly used in removable denture frameworks and some crown substructures, are considered to have very low magnetic susceptibility. Similarly, gold-based alloys and titanium — increasingly used in implant-supported restorations — are well-established as MRI-compatible materials.

This does not mean all dental metalwork is without any consideration. Older restorations, mixed-alloy work, or restorations from unknown origins may warrant closer assessment. Patients who are uncertain about the composition of their crowns should discuss this with their dentist, who can review clinical records or contact the laboratory that fabricated the restoration.

If you are considering dental crowns as a restoration option, discussing the materials used is always part of a thorough treatment planning conversation.

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What Happens During the MRI Pre-Assessment?

Before any MRI scan is performed, you will typically complete a detailed safety screening questionnaire. This is a standard and important part of the MRI process. You will be asked to disclose all metallic items that may be present in or on your body, including dental restorations.

It is important to be honest and thorough during this process. Key information to provide includes:

• Whether you have any metal dental crowns, bridges, or implants
• Any removable dental appliances, such as partial dentures with metal clasps
• Dental braces or orthodontic retainers containing metal
• Any history of dental implants (the implant post itself is typically titanium)

The radiographer or radiologist will use this information to determine whether the scan can proceed safely and to plan the imaging in a way that accounts for potential artefacts. In many cases, dental crowns will not prevent an MRI from taking place at all. The clinical team may simply note the presence of the metalwork when reviewing the images.

If you have been asked to provide details about a specific crown and are unsure of its composition, contact your dental practice. A good dental team can help you locate records or provide documentation for your medical team.

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When Should You Speak to Your Dentist Before an MRI?

For the majority of patients with standard metal dental crowns, no special dental intervention is required before an MRI scan. However, there are certain situations where seeking advice from your dental team beforehand may be helpful.

You may benefit from speaking to your dentist if:

• You are unsure of the material used in your crown, particularly if it was placed many years ago or overseas
• You have experienced any loosening, cracking, or damage to your crown, as a compromised restoration may behave differently
• You have multiple dental restorations including implants, bridges, or orthodontic metalwork, and your scan is focused on the head or neck region
• Your medical team has specifically requested written documentation of your dental materials

It is worth noting that dental implants — though distinct from crowns — are also commonly of interest during MRI pre-assessment. Titanium implant posts are generally considered MRI-safe, though implant-supported crowns may have metal components worth clarifying. You can learn more about dental implants and the materials involved through a consultation with a qualified dental professional.

In all cases, your radiology team has the clinical expertise to make the final decision about scan safety. Dentists can provide supporting information, but MRI clearance decisions rest with the medical team conducting the scan.

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Can a Metal Crown Cause Pain or Discomfort During an MRI?

This is a question many patients are concerned about. The reassuring answer, for most cases, is that metal dental crowns do not typically cause pain or significant discomfort during an MRI scan.

Because most dental crown alloys are non-ferromagnetic or only very weakly magnetic, they are not meaningfully pulled or moved by the magnetic field. Some patients report a very mild sensation of warmth around metallic dental restorations during an MRI — this is due to a phenomenon known as radiofrequency heating, which occurs when radio waves interact with conductive metals. This warming effect is generally minimal with small dental restorations and is carefully considered when MRI parameters are set by the radiology team.

A small number of patients with multiple or extensive dental metalwork — particularly those undergoing head and neck imaging — may notice localised warmth or mild discomfort. If you experience any discomfort during a scan, the MRI technician can pause the procedure. You will always be given a way to communicate with the team throughout the scan.

It is worth noting that significant pain during an MRI scan related to dental crowns would be uncommon. If you are experiencing dental pain or sensitivity unrelated to the scan, this should be assessed by a dentist separately.

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Prevention and Oral Health Advice: Maintaining Your Crown Long-Term

Whether you have a metal crown, a ceramic crown, or a porcelain-fused-to-metal restoration, proper maintenance is important for both the longevity of the crown and your wider oral health. A well-maintained crown is less likely to develop complications that could raise questions before a medical procedure.

Practical guidance for maintaining your dental crown:

• Brush twice daily using a fluoride toothpaste, paying careful attention to the gum margin around the crown
• Floss or use interdental brushes around the crown daily to prevent plaque accumulation beneath the gum line
• Attend regular dental check-ups — routine examinations allow your dentist to monitor the condition of your crowns and identify any early signs of wear, damage, or decay beneath the restoration
• Avoid excessive force on crowned teeth — biting very hard foods, chewing ice, or grinding teeth can shorten the lifespan of any crown
• Inform your dentist of any changes — if your crown feels different, has become sensitive, or appears to have shifted, seek assessment promptly
• Wear a nightguard if recommended — patients who grind their teeth (bruxism) may benefit from a protective appliance to reduce stress on crowned teeth

Keeping records of your dental treatment — including the type and material of any crowns placed — is also practically useful. This information can be valuable in a range of medical contexts, including MRI pre-assessment.

Patients seeking advice about general dental care can discuss crown maintenance and overall oral health during a routine dental appointment.

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Key Points to Remember

• Metal dental crowns are generally considered safe in MRI scans, as most dental alloys are non-ferromagnetic or only very weakly magnetic.
• Image distortion is possible near the scan site, particularly if the imaging involves the head, neck, or jaw region — your radiology team will account for this.
• Always disclose your dental metalwork during the MRI pre-assessment screening process.
• Pain or significant discomfort during an MRI related to dental crowns is uncommon, though mild warmth may occasionally be noticed.
• If you are uncertain about your crown's material, contact your dental practice — they may be able to provide documentation or review your clinical records.
• Regular dental check-ups help maintain the condition of your crowns and ensure accurate records are kept for situations such as medical procedures.

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Frequently Asked Questions

Can I have an MRI if I have metal dental crowns?

In the majority of cases, yes. Metal dental crowns made from commonly used dental alloys are generally considered safe for MRI scanning. Most dental alloys are non-ferromagnetic, meaning they are not significantly attracted to the MRI's magnetic field. You should always disclose your dental restorations during the MRI pre-assessment process, as the radiology team will factor this into the scanning plan. In some cases involving head or neck imaging, the team may note potential image distortion near the dental metalwork.

Will my metal crown affect the quality of the MRI image?

It is possible that a metal crown may cause a degree of image distortion — known as a susceptibility artefact — in the area immediately surrounding the restoration. This is more likely to be relevant if the MRI is focused on the head, jaw, or neck region. For scans of other body areas such as the spine, abdomen, or limbs, dental crowns are unlikely to have any meaningful effect on image quality. Your radiographer will assess this based on the specific scan required.

Should I remove a removable dental appliance before an MRI?

Yes. If you have removable dental appliances such as partial dentures with metal clasps, orthodontic retainers, or temporary crowns that are not permanently cemented, you will typically be asked to remove these before entering the MRI room. Fixed crowns, bridges, and implants cannot be removed and are assessed as part of the pre-screening process. Always inform the MRI team of both fixed and removable dental appliances.

Are porcelain-fused-to-metal crowns treated the same as all-metal crowns for MRI purposes?

Porcelain-fused-to-metal (PFM) crowns have a metal substructure beneath the ceramic outer layer. The metallic component is assessed in the same way as an all-metal crown for MRI purposes. The specific alloy used in the substructure will influence how the crown interacts with the magnetic field. If you are unsure of the materials in your PFM crown, your dental practice may be able to provide this information from your clinical records.

Can a metal dental crown move during an MRI?

This is an understandable concern, but for dental crowns made from standard dental alloys, movement during an MRI is not a clinically expected outcome. Because these materials are non-ferromagnetic or only very weakly magnetic, the magnetic force acting upon them is negligible. The crown is also cemented firmly onto the tooth structure, which provides additional physical retention. If you have concerns about a specific crown — particularly an older or unfamiliar restoration — speaking to your dentist before your scan is a sensible step.

Do I need a letter from my dentist before having an MRI with a dental crown?

This is not routinely required for standard metal dental crowns. In most cases, disclosing your dental restorations during the MRI pre-assessment questionnaire is sufficient. However, if your medical or radiology team requests written documentation — for example, if you have extensive dental metalwork, implants, or if the scan is particularly close to the jaw region — your dental practice should be able to provide a brief letter confirming the type of restoration and materials used. Contact your dental team well in advance of your appointment if documentation is needed.

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Conclusion

For most patients, metal dental crowns are safe in an MRI scan. The alloys commonly used in dental restorations are selected for their biocompatibility and stability, and the majority of these materials have low or negligible magnetic susceptibility. While image artefacts near the dental metalwork are possible in some scanning scenarios, this is a technical consideration managed by the radiology team rather than a safety barrier for most patients.

The most important steps you can take are to disclose your dental restorations honestly during MRI pre-assessment screening and, if in doubt about the composition of an older or unfamiliar crown, to seek clarification from your dental practice.

Are metal crowns safe in an MRI? For the vast majority of patients, the answer is yes — but the right information in the right hands is what makes any medical or dental procedure as safe and straightforward as possible.

If you have any concerns about your dental restorations or upcoming medical procedures, we encourage you to speak with your dental team, who can review your records and provide relevant information to support your medical care.

Dental symptoms and treatment options should always be assessed individually during a clinical examination.

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This article is intended for general educational purposes only and does not constitute personalised dental advice. Individual diagnosis and treatment recommendations require a clinical examination by a qualified dental professional.

Next Review Due: 24 August 2027