Peg and stump structures
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Dental structures are produced and attached in the tooth's root in similar fashion to inlays. They are used for root canal treated teeth in which large proportions of the hard tooth substances of the tooth crown have already been lost.
An imprint is produced with the help of an impression, on which the waxen or plastic structure is later produced. This modellation is then cast in precious metal, just like an inlay. The cast pin-stump structure is cemented into the prepared root. The cast pin-stump structure provides the tooth with more rigidity and is now prepared for the intake of the crown.
Fitted anchors and self-threading pins
Apart from casting processes, there are further options of creating tooth structures:
- Fitted anchor screws, which are screwed into the bored root;
- Highly stable polymer pins can also be attached in the root canal instead of a screw;
- Self-threading pins as tools to anchor plastic filling materials.
Fitted anchors are pre-manufactured parts (mostly screws) for the production of a pin-stump structure. The anchor head can then be encased in plastic filling material (e.g., composite or glass ionomer cement). The tooth structured in this manner is now ready to be bevelled for a crown.
In the case of large fillings, self-threading pins can provide additional hold for the filling material. A self-threading pin is screwed into the dentin next to the pulpa.
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