Zirconia

With an extensive clinical history of working with full-contour zirconia and more than 300,000 crowns seated, NDX provides an economical, efficient solution for posterior restorations when strength is at a premium. With these virtually unbreakable all-ceramic crowns, you can provide your patients the strength to withstand severe parafunctional activity and avoid metal restorations. The full-contoured zirconia crown or bridge contains no porcelain overlay. It is glazed with a smooth surface and functions optimally in the posterior. Benefits include: superior strength, a smooth metal-free finish to the gum line, biocompatible medical-grade zirconia and CAD/CAM fabrication for a consistent fit.

Products

PFZ

What is PFZ?

An all-ceramic restoration with a zirconia core and a porcelain overlay. An alternative to PFM’s, the PFZ is more aesthetic than the total zirconia BruxZir® restoration and can be prescribed anywhere in the mouth. By integrating the best of class CAD/CAM systems, NDX has created a crown that delivers on price, fit, strength, and aesthetics.

Advantages

  • Scanned, designed and milled for a precision fit
  • A perfection solution in anterior and posterior
  • Metal free alternative to PFM’s
  • Predictable price - No volatile gold costs.
  • Large span bridges available
  • Conventional cementation. Use your favorite cement.
  • Zirconia strength:
    • 2x stronger than alumina ceramics
    • 5x stronger than conventional glass ceramics
    • Strength of a PFM
  • Aesthetics of an all ceramic:
    • Natural translucency
    • No black oxidation lines or gingival graying

Contraindications

  • Beveled, feathered or knife-edge margins
  • Tight inter-occlusal space where core may be exposed

Prep requirements

  • 2mm occlusal clearance
  • 1mm deep, 360 degree chamfer margin

It is important to remember that scanning software and milling equipment will not reproduce sharp angles, points, or edges on a prep.

What to send

  • Upper and lower models or impressions
  • Shade
  • Bite registration

Medical Insurance Codes

  • D2740 - Crown Porcelain/Ceramic

BruxZir®

Indications

  • Ideal for bruxers and grinders who have destroyed other restorations
  • Posterior restorations
  • An esthetic alternative to posterior PFMs with metal occlusals and full-cast crowns

Contraindications

  • Not desirable for anterior esthetics

Preparation

  • Any margin preparation acceptable; slight chamfer preferred
  • Conservative preparation similar to a full cast gold
  • 1.0mm of occlusal space is ideal, however a prep with at least 0.75mm is acceptable

Adjusting and Polishing

  • Use a fine grit diamond with copious amounts of water and air spray to keep the restoration cool and to avoid micro-fractures.
  • Always polish post-adjustment with porcelain polishing system
    Recommended: Axis BruxZir® Adjustment and Polishing Set LS-7579 available from your dealer

Cementation Recommendations

  • Ceramir® Crown & Bridge or a resin-reinforced glass ionomer cement such as RelyX™ Luting Cement or GC Fuji Plus™
  • To increase retention on short, tapered preparations, remove saliva contamination with Ivoclean paste (Ivoclar Vivadent) and use self adhesive resin cements such as RelyX Unicem (3M Espe) or SpeedCEM (Ivoclar Vivadent)

Removing a BruxZir® Crown

  • Recent research by Clinical Research Associates (CRA) indicates that bur performance was based more on brand than on grit or shape. The top performing burs were: Premier Two Striper [770.8Z, 770.8C, 770.8F], Midwest Diamonds [856 Fine/Coarse]. For a cost -effective option, try: Microcopy NeoDiamond [1116.8C, 1116.8F] (CRA July, 2012)
  • Use plenty of water. Apply firm pressure in repeated, short, on-off sequence.
  • Cut through the crown facial to lingual and use crown spreader. Pieces normally come off in large chunks.

Medical Insurance Codes

  • D2740 Crown - Porcelain/Ceramic Substrate
  • D6245 Pontic Porcelain/Ceramic
  • D6740 Abutment Crown Porcelain/Ceramic