ANSWERS

What is a PFM crown?

A PFM (porcelain-fused-to-metal) crown is a two-layer dental restoration: a cast metal substructure covered by layered porcelain. The metal delivers strength and marginal fit; the porcelain delivers esthetics. PFMs remain the workhorse posterior crown for cases where full-zirconia is over-engineered and lithium disi...

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Why it works this way

A PFM crown, short for porcelain-fused-to-metal, is a dental restoration built in two layers. The inner layer is a cast or milled metal coping, usually a high-noble, noble, or base-metal alloy. The outer layer is feldspathic porcelain, layered and fired onto that coping to reproduce the shape, contour, and shade of the natural tooth. The metal gives the crown its strength and marginal seal. The porcelain gives it the esthetics. You have probably placed hundreds of them. The question worth asking in 2026 is not whether PFMs still work, but when they are still the right prescription and how the lab you send them to affects the outcome.

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How long does a PFM crown last?

Clinical longevity data on PFM crowns runs 10 to 15 years for the median restoration, with well-fabricated cases regularly exceeding 20 years. The primary failure modes over time are porcelain chipping (usually within the first 5 to 7 years if it is going to happen) and marginal metal exposure as tissue recedes. Lab technique on the coping design and porcelain layering drives most of the longevity variance. Patient occlusion and parafunction habits drive the rest.

Are PFM crowns still used in 2026?

Yes, though the case mix has shifted. Monolithic zirconia has taken most posterior single units and lithium disilicate has taken most anterior single units. PFMs remain the workhorse for long-span posterior bridges, cases with limited interocclusal clearance, restorations opposing heavily restored dentition, and any case where the abutment or framework is already metal. They are no longer the default, but they remain the correct prescription for a specific set of clinical scenarios.

What is the difference between a PFM crown and a zirconia crown?

A PFM has a metal coping with layered porcelain fired onto it. A zirconia crown is monolithic ceramic, milled from a single block of yttria-stabilized zirconia with no metal substructure. Zirconia is stronger in flexural terms (900 to 1200 MPa versus roughly 400 MPa for the porcelain layer of a PFM) and cannot chip because there is no layered porcelain. PFMs offer more esthetic flexibility on the porcelain side and better performance on long-span bridges.

Can a PFM crown be used on a front tooth?

It can, and it was standard practice for decades, but lithium disilicate has largely replaced it on anterior single units. The reason is the metal margin. On thin biotypes, the metal collar shows through the tissue as a gray line over time. A porcelain-butt margin design mitigates this and can make an anterior PFM esthetically acceptable, but lithium disilicate delivers better light transmission and no metal-shadow risk. PFMs remain reasonable on anterior bridges where span rules out lithium disilicate.

What alloy is used in a PFM crown?

Three categories: high-noble (over 60 percent noble metal, typically gold-platinum-palladium), noble (25 to 60 percent noble metal), and base metal (under 25 percent noble metal, usually nickel-chrome or cobalt-chrome). High-noble delivers the best biocompatibility, corrosion resistance, and porcelain bond consistency at the highest cost. Base metal is stronger and cheaper but has higher rates of allergic sensitivity and can be more challenging on the porcelain bond. The prescription should specify which category and, for high-noble, which specific alloy.

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