Ivoclar Vivadent IPS e.max CAD Labside - Manual (Page 11)

11
Shade determination of the natural tooth
After tooth cleaning, the tooth shade of the non-prepared tooth and/or the adjacent teeth is determined
with the help of a shade guide. Individual characteristics have to be considered when determining the
tooth shade. If a crown preparation is planned, for example, the cervical shade should also be deter-
mined. In order to achieve the best possible true-to-nature results, shade determination should be
carried out in daylight. Furthermore, the patient should not wear clothes of intense colours and/or
lipstick.
Die shade selection
In order to facilitate the reproduction of the desired tooth shade, the shade of the preparation is
determined with the help of the IPS Natural Die Material shade guide. This enables the technician to
fabricate a model die similar to the preparation of the patient, on the basis of which
the correct shade and brightness values of the all-ceramic restorations may be
selected.
Example of the preparation shade effect
Crown made of IPS e.max CAD HT B1 on different preparation shades.
Which block should be used?
The suitable block is selected on the basis of the following criteria:
1. Desired tooth shade
2. Preparation shade or abutment shade
3. Type of restoration
4. Restoration thickness and/or preparation depth
5. Processing technique (staining, cut-back or layering technique)
6. Cementation material
Please refer to the table on page 62 for block selection
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