Ivoclar Vivadent IPS InLine System - Manual (Page 50)

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Please refer to the “framework design Guidelines for Metal-ceramic restorations” for additional
information on framework design. they can be ordered from your Ivoclar vivadent contact
address.
Important
the retention pins must be placed in such a way that they do not interfere during try-in or in the articulator.
they should only be removed without causing overheating once the restoration has been completed.
retention pins
It is important for the press-on-metal technique that retention pins are attached to the crown and bridge frameworks.
These retention pins have to be attached in the area of the pontics or the scallops. They are directly attached to the frame-
work with the help of wax. Dimensions of Ø 1.0–1.5 mm for the retention pins have proven to be useful.
Advantages of cast-on retention pins:
1. Act as cooling struts during casting and firing
2. Retention for improved fixation in the investment material during the press-on procedure with IPS InLine PoM
3. Handling aid for further processing
The retention pins have to be shaped in such a way that the bridge framework cannot distort and/or move in the
investment material. At least 2 retention pins (diverging) have to be provided for bridge frameworks, one of which has to
be positioned in the area of the pontic.
If straight wax wires are used, 2 diverging wires have to be applied for bridg-
es. A profile has to be positioned in the area of the pontic.
Pontics may also given a hollow design (e.g.
Inzoma) for enhanced heat distribution and/or
cooling.
F R A M E W O R K D E S I G N
f o r m e t a l -c e r a m i c r e s t o r a t i o n s Manual