Ivoclar Vivadent IPS InLine System - Manual (Page 12)

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2. framework design for fired ceramic shoulders
With fired ceramic shoulders, make sure that the framework rather than the veneer is supported by the prepared tooth.
The framework is thus reduced exactly to the inner edge of the chamfer or shoulder preparation to achieve functional
support of the framework on the preparation. Excellent accuracy of fit on the preparation is essential to ensure that the
shoulder material may not reach the inner aspects of the framework during subsequent application.
wrong correct
Single connector width
= single stability
Double the width of the
connector
= double the stability
Double the height of the
connector with single width
= eightfold stability
3. framework stability
The dimensions and shape of the interdental connector surfaces significantly influence the stability of the restoration
during processing as well as the clinical long-term success after incorporation. Therefore, the dimensions of the interdental
connector surface must be designed in accordance with the alloy used (take the 0.2% proof stress into account)! The
thermal behaviour of the selected alloy during processing has to be considered when designing the framework.