When to Choose PFM Over All-Ceramic: A Lab's Honest Breakdown

Walk through any dental trade show in 2024 and the booths tell one story: zirconia, lithium disilicate, layered ceramics, monolithic everything. PFM gets a quiet corner near the back, if it gets one at all. The conversation has moved on.

The bench has not. At Dani Dental, porcelain-fused-to-metal still accounts for roughly 15 to 18 percent of our fixed restorative volume, depending on the month. That number has held steady for three years while the rest of the industry kept calling PFM dead. The reason is simple: there are cases where metal-backed restorations are still the right answer, and an honest lab will tell you which ones.

This is written for general dentists and prosthodontists who are deciding case-by-case, not for the offices that already went 100 percent ceramic three years ago and never looked back. If that is you, skip this one. If you still want a framework, keep reading.

The structural argument that has not gone away

Lithium disilicate has a flexural strength around 400 MPa. Monolithic zirconia clears 1000 MPa and high-translucency formulations land between 700 and 900 MPa depending on the brand. Both numbers look great on a spec sheet.

PFM substructure is a different conversation. The metal coping does not fracture under flex. It deforms, which is a recoverable failure mode in a way that ceramic chipping is not. When we get a remake request on a PFM unit, it is almost never the substructure. It is the porcelain layer that chipped, or the margin that opened, or the shade that did not match the adjacent tooth.

For a long-span posterior bridge in a patient with documented bruxism, we still recommend PFM in case reviews about 40 percent of the time. The other 60 percent goes to monolithic zirconia, and the deciding factors are usually opposing dentition, occlusal clearance, and the patient's history of ceramic fractures on prior work.

When we recommend PFM in the case-planning conversation

Here is the short list we work through with prescribing dentists when a case lands on the planning queue:

Long-span posterior bridges, 4 units or more.Monolithic zirconia is structurally fine here, but the connector design constraints get tight fast, and patients with reduced interocclusal space are better served by a metal substructure that can be made thinner without losing strength. We have shipped 5-unit posterior PFM bridges with connector areas at 9 mm squared that have held up for the seven-year case-tracking window we maintain on bridge work.

Cases with subgingival margins on heavily prepped abutments.PFM with a metal collar gives the clinician a margin that finishes predictably at or below the gingival crest. All-ceramic with subgingival margins works, but the prep tolerance is tighter and the cement line shows more often when the soft tissue recedes a year or two post-cementation.

Patients with documented opposing zirconia restorations.Zirconia-on-zirconia wear patterns are a known concern. PFM with a porcelain occlusal surface gives a more predictable wear interface against an existing zirconia unit on the opposing arch. This comes up more often than you might expect, especially in restorative cases where the patient had previous work done at a different practice.

Implant-supported single units in the posterior with limited occlusal clearance.When we have less than 4 mm of vertical space from the implant platform to the opposing dentition, PFM gives us a thinner overall restoration profile without compromising the substructure. We have shipped these at 3.5 mm total height when the case demanded it.

Re-cementations of existing PFM work where the prep cannot be re-prepared.If the patient has a 12-year-old PFM crown that came uncemented and the prep is intact, fabricating a replacement in the same material class is usually the lower-risk call. Switching to ceramic on a prep designed for PFM means either re-prepping (which the patient often does not want) or accepting a thicker restoration than the prep was designed to support.

When we recommend against PFM

The other direction matters just as much. We push back on PFM prescriptions and recommend ceramic when:

Anterior esthetic cases, almost always.The metal substructure creates a value shift that even the best porcelain layering work cannot fully compensate for. Layered lithium disilicate or feldspathic veneers over a translucent substructure give the depth and chroma transition that anterior cases demand. We have not shipped an anterior PFM in the 6 to 11 zone in over two years, and the prescribing dentists who used to specify it have all moved to layered ceramic with no regrets.

Patients with documented metal sensitivities.This is rare but real. We have had three cases in the past 18 months where the clinician confirmed a nickel or palladium sensitivity, and we shifted the restorative plan to high-translucency zirconia. The cost in chair time for the prep modification was minor compared to the alternative.

Single posterior units where occlusal clearance is adequate.Monolithic zirconia at 1.5 mm occlusal thickness is the workhorse here. No reason to specify PFM unless one of the other factors above is in play.

Any case where the patient's esthetic expectations are clearly stated as the priority.PFM under bright operatory lighting shows the opacity of the substructure, especially at the gingival margin. If the patient is going to scrutinize the result, ceramic gives you more room to deliver something that meets the expectation.

The cost conversation, briefly

PFM units at our lab run about 12 to 18 percent less than the equivalent ceramic restoration, depending on the alloy specification (high-noble, noble, or base metal). For DSO partners managing per-unit lab costs across multiple offices, that delta matters at volume, but it is rarely the deciding factor on a per-case basis. The cost argument should follow the clinical argument, not lead it.

What we will tell you in a case review

When a prescription comes in and the case factors do not line up with the material specified, the technician on the case calls the office directly. Not an email, not a portal message, a phone call from the person fabricating the unit. That conversation usually takes 4 to 7 minutes and saves a remake.

The broader point: PFM is not dead, ceramic is not universal, and the deciding factors are case-specific in a way that does not reduce to a marketing slogan. Any lab that tells you otherwise is selling you something. We would rather have the conversation about your specific case and ship the right material the first time.