The zirconia for restorations without veneering
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
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
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.
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
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.
Cementation of a crown made of zirconia
Cementation of inlays, onlays or veneers made of zirconia
Conventional cementation of a zirconia crown
Cementation of a crown made of zirconia on Raw-Abutment®
Cementation of a zirconia restoration on titanium bases
Prettau® Zirconia work examples
Prettau® Zirconia products
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