Fixed Restorations

Oral Z Ultra

Oral Z Ultra

Zirconia core with porcelain overlay. With a flexural strength of up to 1,450 MPa, the zirconia substructure is practically indestructible. Like the Oral Z Lingual, Oral Z Ultra is hypoallergenic and biocompatible. Crafted by layering esthetic porcelain over a zirconia substructure, they provide the strength of PFM crowns while eliminating esthetic challenges, such as discoloration or the dark line that can appear along the gum line. They require conventional cementation and are also a good option for ceramic veneers. Through the use of advanced CAD/CAM technology, they provide consistently accurate fit. Due to zirconia's natural translucency, these crowns are warmer and provide superior lifelike coloration when compared to their PFM counterparts.

Indications

A CAD/CAM substitute for traditional PFM, our porcelain-fused-to-zirconia can be used for anterior and posterior crowns, crowns over implants, and bridges of up to fourteen units.

  • Attachment cases
  • Cases with less than 1 mm clearance
  • Bruxism
  • Patients who have broken a PFM crown
  • Cases that require bonding

The ideal preparation for PFZs is a chamfer margin preparation. If a porcelain labial margin is prescribed, then a shoulder margin preparation is required. Feather-edge margin preparations are indicated for full-cast restorations.

  • Resin Ionomer cement (RelyX or RelyX Unicem, 3M ESPE)
  • Maxcem Elite (Kerr)
  • Panavia F 2.0 (Kuraray) - ideal for short, tapered preparations
  • Glass ionomer cement (GC Fuji, GC America)

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).

  • D2740 Crown - porcelain / ceramic substrate