Procera® AllZirkon Preparation

Shade Selection:

  • Select shade with the Vita Lumin Guide.

Laboratory Requirements:

  1. Thoroughly detailed prescription denoting which teeth are to be crowned, extracted and/or bridged as well as selected shade.
  2. Clear and accurate upper and lower full arch impressions or study models.
  3. Bite registration.

Chairside Preparation

1. Overview

  1. With Procera AllZirkon, you follow your normal procedures. You prepare as you would with a regular core of metal alloy.
  2. Use the diamonds and carbides you are using now for routine crown preparations. NOTE: Nobel Biocare has a prep kit available featuring different sized diamonds that might be helpful in achieving the optimum prep.
  3. Procera AllZirkon can be fabricated on conservative 360º shoulder/heavy chamfer margin preparations. Clear margins are a prerequisite for an accurate restoration.
  4. Margins should be sharp, but all internal features, whether positive or negative, should be rounded as with Procera AllCeram. Avoid sharp angles and undercuts.
  5. Maintain an even reduction of anatomical form.
  6. These are minimum requirements. Strength will be increased with more tooth reduction (Note: opacity will be less, translucency will be better).

2. Preparation Tips

General Guidelines

Recommended dimensions for preparations (Figures 1a and 1b).

The preparation is characterized by thinned margins and rounded inner angles and edges.
(Figures 2a and 2b).

Bridge Framework Preparation

Shoulder/heavy chamfer design with a depth of 1.5 mm with rounded internal line angles recommended for abutment teeth. Relatively flat occlusal surfaces.

General guidelines for bridge preparation are identical to those for crowns with the following additions:

  • The prepared teeth must allow a bridge with an occlusal cervical height of at least 3mm.
  • The edentulous space between the unprepared teeth has to be less than 11mm.
  • Preparation should also be tapered away from the edentulous space to enable the correct connector design.

Adjustment Tips:

  • Avoid internal adjustment of Procera AllZirkon restorations. When adjustments are necessary, adjust prepped tooth.
  • Use a diamond with water for ceramic adjustments of veneer porcelain.
  • Avoid localized overheating, which can result in micro-cracks.
  • Avoid carbide use.

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