ANSWERS

Is the metal in PFM crowns safe?

Yes. The metals used in porcelain-fused-to-metal crowns are clinically safe for the vast majority of patients. PFM substrates use noble alloys (gold, palladium, platinum) or base-metal alloys (nickel-chromium, cobalt-chromium). The 2016 ADA Council on Scientific Affairs review confirms dental casting alloys meet ISO...

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The biocompatibility data on PFM substrate metals

Porcelain-fused-to-metal crowns have been the workhorse indirect restoration since the 1960s, and the metallurgy is well-characterized. PFM substrates fall into three ADA classifications: high noble (greater than 60 percent noble metal, at least 40 percent gold), noble (at least 25 percent noble metal), and base metal (less than 25 percent noble). The ISO 22674 standard governs mechanical and biological performance for all three, and the 2016 ADA Council on Scientific Affairs review of dental casting alloys found no evidence of systemic toxicity from properly cast substrates in clinical service.

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Should I switch all my PFM cases to zirconia to avoid metal sensitivity?

Not categorically. Monolithic zirconia is an excellent choice for most posterior single units and many bridges, and it removes substrate-allergy questions entirely. But PFM still has defensible indications: long-span bridges where the flexural data favors metal substructure, cases with aggressive opposing occlusion, and existing PFM quadrants where matching matters. The decision is case-specific. Send the case planning notes to your assigned technician at Dani Dental and the recommendation comes back with the rationale, not a default.

What alloys does Dani Dental use for PFM substrates?

Dani Dental stocks high noble (gold-based), noble (palladium-silver), and cobalt-chromium base-metal substrates. Nickel-chromium is available on request but is not the default. Every PFM prescription includes the alloy selection on the lab slip, the technician's name, and the technician's direct line. For patients with reported nickel sensitivity or any documented metal allergy, the default routing is noble alloy or cobalt-chromium with the allergy history confirmed before the case is cast.

How does the metal margin on a PFM crown affect esthetics?

The metal collar at the gingival margin is the classic PFM esthetic limitation, particularly on maxillary anteriors where tissue recession over time can expose the dark line. Dani Dental's ceramist can specify a porcelain butt margin to eliminate the metal display facially, which solves most anterior PFM esthetic objections. For high-smile-line anterior cases, the case planning conversation typically points toward layered lithium disilicate or zirconia rather than PFM, because the long-term esthetic ceiling is higher.

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