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Dental Crown Model

Cicero Dental Systems, Hoorn, Netherlands.

Cicero Dental Systems produces full-ceramic crowns with the aid of CAD-CAM.

The system makes use of a fast laser-stripe scanning method to measure the three-dimensional geometry of the preparation of the tooth to receive the crown and its immediate surroundings and the opposing teeth. This information is transmitted to the CAD program. A crown from a library is shaped so that it fits in a natural-appearing row with the adjacent teeth while the program designs the surface to give maximum tooth-to-tooth contact with the antagonist. The software calculates the interior surface of the crown corrected with marginal gap and overall cement thickness and the interface between the two ceramic layers as specified by the operator. The information of the designed surfaces is used for the milling operations to produce the crown. The information of the surfaces to be milled in the CAD program was directly converted into the FEMAP neutral file format as surface elements. Once the information is imported into FEMAP, analysis is performed using CAEFEM.

This crown, shown here, has been placed on a prepared back-tooth. The model consists of the prepared molar, the cement layer fixing the crown to the back-tooth and the two ceramic layers composing the crown.

The crown’s shape and the choice of the cement layer are considered of prime importance for long term performance, since it involves a fully ceramic crown positioned at a location inside the mouth where maximum grinding forces occur.

Copyright © 2009 Concurrent Analysis Corporation. All rights reserved.
CAEFEM is a trade mark of Concurrent Analysis Corporation.
FEMAP is a registered trade mark of Siemens Corporation.
All other trade marks are the property of their respective owners.

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