Ivoclar Vivadent Zenostar - Manual (Page 15)

15
Connector design
When designing the connectors, attempt to create the largest possible cross section.
In terms of stability, the height of the connector is more important than the width. Doubling the width will lead to a twofold
increase in stability while doubling the height will result in an increase in stability of up to four times.
The mechanical stress on the construction increases the further apart the abutment teeth are positioned from each other and the
higher the masticatory forces acting on the constructions are. As a consequence, frameworks comprising more than two pontics
between two abutment teeth are not permissible.
Notes on CAD/CAM processing
Zenostar T/MO materials are designed exclusively for processing in CAM milling units from the Wieland Zenotec range and by
Authorized Milling Partners in conjunction with the respective milling templates. If other CAD/CAM systems are used, the quality
of the resulting restoration cannot be guaranteed, particularly not in terms of accuracy of fit, milling precision, marginal quality and
surface quality.
If bridges comprising more than 5 units are designed, a sinter support structure should be attached to the milling object already
during the CAM process. The type of construction depends on the sintering furnace and the sintering program used. If multi-unit
bridges are not supported by an appropriate sinter support structure, they may involve the risk of becoming deformed during final
hard sintering.
Sinter support structures are categorized into sinter drops, sinter frames and sinter "tongues".
Please refer to the Zenostar Design Guidelines for detailed information.