VITA In-Ceram YZ – Clinical Aspects

Clinical aspects

  • Zirconium dioxide has been used in the field of hip-joint prosthetics for roughly 30 years. It exhibits very high strength, high corrosion resistance and low thermal conductivity.
  • The structure and the veneering material are both biocompatible and do not have any allergic potential.

Radiopacity
Zirconium dioxide ceramic is radiopaque.

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.

Shoulder preparation
Chamfer preparation		 Incorrect chamfer preparation
Tangential preparation is contraindicated

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.

preparation

Preparation of anterior teeth

The incisal area of anterior teeth
should be reduced by 2mm.

Cementation Information
Restorations made of VITA In-Ceram® YZ CUBES for CEREC® are suitable for non-adhesive cementation with glass ionomer or zinc phosphate cements or adhesive bonding with the self-hardening PANAVIA 21 TC or the dual-hardening PANAVIA F (Kuraray).

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 120,00 rpm while ensuring maximum cooling with water.