PFM

PFM

Porcelain-fused-to-metal restorations provide strength to a crown or bridge, and offer a long-tested track record. Dentists have been placing PFM crowns for patients since the late 1950s. These restorations are very strong and durable. The combination of porcelain bonded to a supported structure of metal creates a stronger restoration than porcelain used alone. However, in more recent decades, their popularity has gradually lost ground to other, more modern, types of restorations such as all-ceramics and zirconia.

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Indications

Our PFMs can be used for crowns and bridges (up to fourteen units). PFMs can be manufactured to nonprecious, semiprecious, and yellow high noble copings and can be used in conjunction with cast partials and implants.

Contraindications

Contraindicated when the patient has a metal allergy or when the size of the tooth pulp is negligibly smaller, thus compromising the tooth preparation process. It is also contraindicated when the clinical tooth crown is very short and lacks the required stability including retention that is enough to provide the space for porcelain and metal.

Preparation

The ideal preparation for PFMs is a chamfer margin preparation. If a porcelain labial margin is prescribed, then a shoulder margin preparation is required.

Cementation

  • Panavia 21 – tin plated
  • Glass ionomer cement (GC Fuji, GC America)
  • Zinc Phosphate Polycarboxylate
  • Resin Ionomer cement (RelyX, 3M ESPE)

Tech Notes

If an adjustment is required on the ceramic, use a fine diamond with water and air to keep the crown cool. To contour the ceramic, polish with a pink rubber wheel and diamond polishing paste (Brasseler, Shofu, Vident).

Codes

  • D2750 Crown Porcelain fused to high noble
  • D2751 Crown Porcelain fused to nonprecious
  • D2752 Crown Porcelain fused to semiprecious
  • D6750 Crown Porcelain fused to high noble (bridge units)
  • D6751 Crown Porcelain fused to nonprecious (bridge units)
  • D6752 Crown Porcelain fused to semiprecious (bridge units)