Ivoclar Vivadent Zenostar - Manual (Page 14)

14
Design criteria for Zenostar restorations
In addition to high-quality materials, professional preparation and processing are equally important to attain high-quality restorations
that are capable of giving long-term satisfaction to patients. The design is key to the success of durable, esthetic and clinically
successful all-ceramic restorations. The following basic principles should be observed:
Framework design
When designing a framework, the aim should be to achieve an anatomical design that supports the veneering ceramic in the area
of the cusps so that these can be veneered with a uniform layer of 1 – 2 mm. Observe the instructions for use of the specific
veneering ceramic that you are using.
Minimum layer thicknesses and dimensions of connectors
Restorations designed using Zenostar T or Zenostar MO require less space than other ceramic restorations. Yet, the specified minimum
wall thicknesses and dimensions of the connectors for monolithic restorations and frameworks must be observed at all times:
Wall thickness/connector cross section for Zenostar T/MO (sintered)
Anterior region
Minimum wall thickness
in mm Connector cross section
in mm
2
Design type
Crowns 0.4 -
Supporting the tooth
shape and/or gingiva
(incisal, occlusal, and/or
basal)
Interlocked crowns 0.6 7
3-unit bridges 0.6 7
4-unit and more-unit bridges with two
pontics
*
0.6 9
Cantilever bridges with a single pontic 0.7 12
Posterior region
Minimum wall thickness
in mm Connector cross section
in mm
2
Design type
Crowns 0.6 -
Supporting the tooth
shape and/or gingiva
(incisal, occlusal, and/or
basal)
Interlocked crowns 0.6 9
3-unit bridges 0.6 9
4-unit and more-unit bridges
with two pontics
*
0.7 12
Cantilever bridges with a single pontic 0.7 12
Design parameters for frameworks veneered using the IPS e.max CAD-on veneering technique
Minimum wall thickness
in mm Connector cross section
in mm
2
Crowns 0.5 -
Interlocked crowns 0.5 7
3-unit bridges 0.5 9
4-unit and more-unit bridges
with two pontics
*
0.5 12
*In Canada, bridge indications are limited to no more than 6 units with no more than 2 adjacent pontics.
The IPS e.max CAD-on veneering technique is approved only for use in conjunction with Zenostar MO.