PFM Crown vs Zirconia Crown vs Metal Crown - Which One is Right for You?

When Do You Need a Dental Crown?

A dental crown is a tooth-shaped cap that fits over a prepared tooth to restore its shape, size, strength, and appearance. Your dentist will recommend a crown in the following situations:

• After root canal treatment: A root canal removes the pulp from a tooth, making it more brittle. A crown protects the tooth from fracture.
• Severely decayed tooth: When a cavity is too large for a filling to hold, a crown covers and protects what remains of the tooth structure.
• Cracked or fractured tooth: A crown holds the tooth together and prevents the crack from spreading further.
• Dental implant restoration: A crown is placed on top of a dental implant to replace a missing tooth.
• Worn-down teeth: Teeth worn due to grinding (bruxism) or acid erosion are restored with crowns to bring back proper bite height.
• Cosmetic improvement: Severely discoloured or misshapen teeth that cannot be corrected with veneers are covered with crowns.
• Dental bridge anchor: Crowns on adjacent teeth hold a dental bridge in place to replace a missing tooth.

How is a Dental Crown Made?

Regardless of the material, all dental crowns go through a similar fabrication process:

At Teeth Care Kolkata, we use CAD/CAM (Computer-Aided Design/Manufacturing) technology for zirconia crowns, which ensures precise fitting and reduces the chance of gaps or discomfort after placement.

Metal Crown - Materials, Pros, Cons and Care

Metal crowns are made from metallic alloys. The most commonly used metals for dental crowns include gold alloy, chromium-cobalt alloy, and nickel-chromium alloy. Metal crowns have the longest track record in dentistry and remain the strongest crown type available.

Types of Metal Used

• Gold alloy: Biocompatible, gentle on opposing teeth, rarely causes allergic reactions. Used less today due to high cost and visible appearance.
• Chromium-cobalt alloy: Most common metal crown material today. Strong, durable, and more affordable than gold.
• Nickel-chromium alloy: Used in some cases but can trigger nickel allergy in sensitive patients.

Care Tips for Metal Crowns

• Brush twice daily and floss around the crown margin carefully
• Avoid biting hard objects like ice or hard candy directly on the crown
• If you grind your teeth at night, wear a night guard to protect the crown and opposing teeth
• Visit your dentist every 6 months so the crown margin can be checked for any gaps or decay

PFM Crown (Porcelain Fused to Metal) - Materials, Pros, Cons and Care

A PFM crown (also called a porcelain fused to metal crown or metal ceramic crown) consists of two layers: a metal inner coping (substructure) that provides strength, and a layer of dental porcelain fused on top to give the crown a natural tooth-like appearance. PFM crowns were the gold standard in dentistry for over 40 years and are still widely used in India today.

The metal substructure in a PFM crown can be made from the same alloys used in full metal crowns - chromium-cobalt being the most common in India. The porcelain outer layer is fired onto the metal frame in a dental furnace at high temperatures to create a strong bond between the two materials.

The Dark Gum Line Issue Explained

The most commonly reported problem with PFM crowns is the dark grey or black line that appears at the gum margin over time. This happens for two reasons:

• Natural gum recession: As gums recede with age, the metal collar at the base of the crown becomes exposed and visible.
• Metal showing through: The porcelain layer at the crown's edge is thin, and the underlying metal can show through as a dark shadow, especially under bright light.

This dark line is permanent once it appears and can only be resolved by replacing the PFM crown with a zirconia crown.

Care Tips for PFM Crowns

• Avoid biting very hard foods - the porcelain layer is vulnerable to chipping on hard objects
• Do not use teeth as tools (opening bottles, tearing packaging)
• If you grind teeth, use a night guard - grinding accelerates porcelain wear
• Check the gum margin regularly - if a dark line appears, discuss replacement with your dentist

Zirconia Crown - Materials, Pros, Cons and Care

A zirconia crown is made from zirconium dioxide (ZrO2), a type of ceramic material that is also used in aviation and medical joint replacements because of its exceptional strength and biocompatibility. In dentistry, zirconia crowns represent the most advanced option currently available and have become the preferred choice at Teeth Care Multispeciality Dental Clinic for most clinical situations.

Types of Zirconia Crowns

• Monolithic zirconia (full-contour): Made entirely from a single block of zirconia. Extremely strong, used mainly for back teeth. Slightly less translucent than layered zirconia.
• Layered zirconia: A zirconia substructure with a porcelain layer on top for enhanced aesthetics. Used for front teeth where natural translucency is important. More like a PFM in construction but fully metal-free.
• High-translucency zirconia: A newer generation of zirconia with improved optical properties that closely mimic natural tooth structure. Best for front teeth.

Care Tips for Zirconia Crowns

• Brush with a non-abrasive toothpaste - avoid highly abrasive whitening pastes that can scratch the surface over time
• Floss gently at the gum margin daily to keep the crown-tooth junction clean
• Zirconia is very strong, but avoid using your teeth to crack open nuts or bottles - this habit damages any crown
• If you have layered zirconia (porcelain over zirconia), the same care applies as PFM - avoid hard biting on the porcelain layer
• Regular 6-monthly dental check-ups to inspect the crown margin

PFM Crown vs Zirconia Crown vs Metal Crown - Side-by-Side Comparison

This table compares all three crown types on the factors that matter most. Note: cost is not included in this comparison as crown pricing at Teeth Care Kolkata depends on the specific tooth, brand, and individual treatment plan - your dentist will explain pricing clearly during consultation.

Crown Placement Process at Teeth Care, Kolkata

At Teeth Care Multispeciality Dental Clinic, we follow a precise two-visit crown placement protocol to ensure accuracy and patient comfort:

How to Care for Your Dental Crown

A dental crown is a restoration, not a replacement for the natural tooth root. The tooth underneath the crown can still decay, and the gum tissue around it still needs care. Follow these guidelines regardless of which crown type you have:

Signs Your Dental Crown Needs Replacement

Even well-maintained crowns need replacement eventually. Watch for these signs:

• Dark line at the gum (PFM crowns): The metal coping is showing through and the crown's aesthetics cannot be restored without replacement.
• Chipped or fractured porcelain: If the porcelain on a PFM or layered zirconia crown chips significantly, replacement is usually needed.
• Pain or sensitivity under the crown: This can indicate decay has developed beneath the crown or the crown is no longer sealing properly.
• Crown feels loose: The dental cement may have washed out. Do not leave this untreated as decay can develop rapidly under a loose crown.
• Visible decay at the crown margin: Seen on X-ray or by your dentist at the junction where crown meets tooth.
• Crown falls off: Visit your dentist immediately. Keep the crown safe and bring it to the appointment.
• Gum recession exposing the crown edge: Can compromise both aesthetics and hygiene at the crown margin.

Which Crown is Right for You?

Here is a practical scenario-based guide to help you decide, based on the cases we see daily at our Kolkata branches:

Frequently Asked Questions

What is a PFM crown and is it still used in 2026?
A PFM crown (Porcelain Fused to Metal crown) consists of a metal inner frame with a tooth-coloured porcelain outer layer. It was the most common dental crown type used globally for over 40 years. In 2026, PFM crowns are still used, especially for back teeth. However, in most modern dental practices in India, zirconia crowns are now preferred because they are metal-free, do not develop the dark gum line problem that PFM crowns are known for, and offer equal or better strength.

How long does a PFM crown last compared to zirconia?
A PFM crown typically lasts 10 to 15 years. The porcelain layer can chip under heavy biting forces and the dark metal line at the gum margin eventually becomes a cosmetic concern. A zirconia crown lasts 15 to 25+ years because it does not have a separate porcelain layer that can chip (in the case of monolithic zirconia) and has no metal component that can cause gum discolouration. Both require proper oral hygiene to achieve maximum lifespan.

Which crown is best for front teeth in Kolkata?
Zirconia crowns are the best choice for front teeth. They provide the most natural, translucent appearance, do not develop a dark grey line at the gum margin over time, and are fully metal-free. High-translucency zirconia crowns placed at Teeth Care Multispeciality Dental Clinic, Kolkata closely match the appearance of natural teeth under all lighting conditions. Metal crowns should not be used for front teeth. PFM crowns can be used but carry the risk of the visible dark gum line as gums recede with age.

Why does a dark line appear at the gum with a PFM crown?
The dark grey or black line that appears at the gum line of a PFM crown has two causes. First, as gums naturally recede with age, the metal collar at the base of the PFM crown becomes exposed and is visible as a dark line. Second, the porcelain at the edge of the crown is thinner and the underlying metal can cast a dark shadow through it even before recession occurs. This is a permanent condition and the only solution is to replace the PFM crown with a zirconia crown, which has no metal component and therefore no dark line problem.

Is a zirconia crown painful to get?
No, the crown placement procedure is carried out under local anaesthesia so you will not feel pain during the appointment. After the first visit (tooth preparation), some patients experience mild sensitivity to hot and cold for 2 to 5 days while wearing the temporary crown. This settles once the permanent zirconia crown is placed. If sensitivity continues after final placement, inform your dentist as adjustment may be needed.

Can I get a zirconia crown over an implant?
Yes, zirconia crowns are widely used for implant restorations and are in fact the preferred option for implant-supported crowns. The biocompatibility of zirconia means that gum tissue around the implant crown responds well with less inflammation compared to metal or PFM alternatives. The absence of metal also means no dark shadow at the gum-crown junction, which is particularly important for implants in the front teeth area.

How many visits does crown placement take at Teeth Care Kolkata?
Crown placement at Teeth Care Multispeciality Dental Clinic involves two visits. During the first visit, the tooth is prepared under local anaesthesia, an impression or digital scan is taken, and a temporary crown is placed. The impression is sent to our laboratory. During the second visit, which is usually 5 to 7 days later, the permanent crown is tried in for fit and bite check, any necessary adjustments are made, and the crown is then permanently cemented. Our five Kolkata branches at Chinarpark, NewTown, Ballygunge, Dunlop, and Charnock all follow this same protocol.

Can a dental crown fall off and what should I do?
Yes, a crown can come loose in rare situations - most commonly when the dental cement washes out over time or if decay develops at the crown margin. If your crown falls off: do not panic, do not attempt to recement it yourself, keep the crown safe in a clean container, and call your dentist immediately for an emergency appointment. Do not leave the tooth exposed for more than 24 to 48 hours as the prepared tooth underneath is sensitive and vulnerable to further damage. At Teeth Care Kolkata, we use high-quality dental luting cements to minimise this risk.