Ivoclar Vivadent IPS d.SIGN - Manual (Page 27)

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Bridge pontics are designed taking aesthetic and functional
aspects into account, as well as oral hygiene. The area of the
pontic that contacts the alveolar ridge should be made of
ceramic. In order to ensure adequate stability between bridge pontic and the bridge abutments, a palatal and/or
lingual scallop is recommended. Furthermore, to ensure even
cooling of the bridge pontic that absorbs the most heat,
additional cooling grooves are advantageous.
5. Design of bridge pontics
The interface between the metal framework and the venee-
ring ceramic must be clearly defined and, if possible,
incorporate a right angle finish line. The juncture between
the metal framework and the veneering ceramic must not
be located in the contact area nor on surfaces involved in
masticatory functions. Furthermore, make sure that the
interface in the marginal area does not come into contact with the gingiva, particularly if a tapered crown margin is
designed (e.g. no metal margin and no ceramic shoulder).
In this way, irritation of the gingiva can be prevented. The
interface in the interdental area should be designed in such
a way that cleaning of these difficult-to-access areas is
possible.
6. Interface between metal and ceramic
Bridge pontic design – ovate pontics Bridge pontic design – saddle-type pontics