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General preparation information

  • * The preparation can be carried out either using a chamfer or a shoulder preparation with rounded interior angle.
  • * A circular cutting depth of one millimeter is required.
  • * The vertical preparation angle should be 3°, however, parallel preparation is also possible if clinically required.
  • * All transitions from the axial towards the occlusal surfaces must be rounded.

 

Our Standards

Preparation of pre-molars and molars
For posterior teeth a simplified occlusal relief should be prepared to provide more space for the ceramic. In the occlusal area at least 1.5 mm of substance should be removed.

Contraindication
A feather edge margin is not recommended, as it does not provide adequate reduction for the porcelain buildup.

Cementation Information
cementation with glass ionomer or zinc phosphate cements or adhesive bonding with the self-

Pretreatment of the zirconium doxide restorations prior to adhesive fixation:

  • Sandblast the inner surfaces of the restoration using aluminium oxide (max. 50 μm) at a pressure of 2.5 bar. Avoid contact with the cleaned surface.
  • Etching with hydrofluoric acid is not possible. Silanizing is not required.
  • Please observe the instructions for use of the manufacturer of the adhesive materials.

 

Removal of integrated restorations
In the event of a crown having to be removed it is recommended to use a cylindrical diamond instrument at a speed of 120,000 rpm while ensuring maximum cooling with water.