Wenn Entlastungszonen wie die A-Linie benötigt werden, sollte der Techniker das Model vor dem Scannen entsprechend Vorbereiten. Wen die A-Linie und andere Entlastungszonen im CAD erstellt werden, wird die gefräste Prothesenbasis nicht auf das Model passen. Trotzdem können A-Linie und (butterfly zone) im CAD definiert werden.
The relieve areas that are defined in this step are:
- torus palatinus (upper jaw)
- tuberculum (upper jaw)
- Trigonum retromolaris (lower jaw)
are raised by a further factor to prevent pain. These zones may be needed to be relieved if the patient has a thick gingival biotype.
The traditional relief zones (see graphics)
are not relevant in digitally produced dentures.
As stated before the A-line and the Butterfly zone are not required when creating a basis digitally. But considering the fact that dentists may search for it and want it, this is also added to this step.
The torus palatinum encloses the incisive papilla, which is determined in the “Alveolar Ridge” step.
All points that have been calculated until this step must be shown (provided the ability to show/hide) them.