The zirconia for restorations without veneering



Prettau® Zirconia is the material of choice for frequently occurring problems like reduced available space, bruxism or ceramic chipping. It offers a functional and at the same time aesthetical solution.

This highly biocompatible and non-porous material distinguishes itself through its extremely high translucency and perfectly natural appearance. Due to these characteristics and if used in conjunction with a special colouring technique, the use of veneer ceramics can be entirely eliminated. In this way, aesthetically pleasing full-zirconia restorations, i.e. the Prettau® Bridge can be realized.

Range of applications 




  • Partial and single crowns
  • Inlays, onlays and veneers
  • Bridges with up to 14 elements (occlusally screwed or cemented)
  • All indications can be manufactured fully anatomically or reduced for veneering with ceramics




Characteristics


Prettau® Zirconia is partially stabilized with yttrium and enriched with aluminium. This results in positive material properties like a high bending strength of up to 1,200 MPa, a high temperature resistance, as well as a constant shrinking factor granting the highest possible precision.

  • Higher translucency due to optimized microstructure of the zirconia
  • No ceramic chipping
  • No abrasion to the antagonist tooth
  • 200% higher bending strength, thanks to the elimination of the veneer ceramics
  • Especially suited in case of implants, reduced available space or restorations with gingival reconstruction

Material composition 


Zirconia is the result of a chemical process: the basis is zirconia sand, partially stabilized with yttrium and made into Zirconia blanks through a mechanical process. Among the dental ceramics available today, zirconium oxide is without any doubt the material with the highest flexural and tensile strength.

By omitting the ceramic layering, a more massive structure can be created, resulting in an overall higher resistance of over 200%. In this way, ceramic chipping and abrasion to the antagonist are being avoided.

Abrasion behaviour 


Compared to polished zirconia, a tooth veneered with ceramics is 10,000 times more abrasive. The porous structure of the layered ceramic acts like sandpaper and causes wear on natural dentition.

This phenomenon can be illustrated using a practical example:
Rubbing our hands together creates abrasion, which can cause open skin areas. Rubbing our hands against a window pane makes the hand slip on the glass surface. This causes a minimal friction and heat, but no abrasion. Something similar is happening when sintered zirconia meets the natural tooth.
Zirconia in sintered state is perfectly smooth and non-porous, so that it slips on the natural tooth without friction, same as a hand on a window pane.

In general we can say:
The harder and smoother the material, the lower is the material wear caused by friction and hence also abrasion.


 

Schematic view of the abrasion in the indenter according to each sample

Processing 


Teeth are modelled and milled as usual, but then coloured with the special Colour Liquid and sintered in the sintering furnace with a specially elaborated program.
The technical know-how of the dental technician is now transferred from the layering technique to the colouring technique. The occlusal surface no longer needs to be tediously layered with ceramics, but can simply be copied from the completely modelled tooth.



Instructions Colour Liquid Prettau® Instructions Colour Liquid Prettau® Aquarell


Cementation 


Cementation of a crown made of zirconia
 

Download Instruction

Cementation of inlays, onlays or veneers made of zirconia
 

Download Instruction

Conventional cementation of a zirconia crown
 

Download Instruction

Cementation of a crown made of zirconia on Raw-Abutment®
 

Download Instruction

Cementation of a zirconia restoration on titanium bases
 

Download Instruction

Prettau® Zirconia work examples 





Galleries Publications


Prettau® Zirconia products 




Prettau® Zirconia blanks are available in 8 differents sizes and 3 different heights for all Zirkonzahn CAD/CAM systems as well as for the manual milling system Zirkograph. Find out more about our products here.

For further processing, you can find more information about our Colour Liquid and ICE Zirkon Malfarben here.

IdentCeram Certificates certify quality and content 


IdentCeram certificates have two parts. The lab retains one with its case records. The second is sent with the case to the dentist to document the material used and for filing in the patient's records. Once filed, the IdentCeram certificate is also useful in supporting insurance claims. Click here for further informations.