Ivoclar Vivadent Telio Lab - Manual (Page 11)

Shade determination
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
deter-mining the tooth shade. If a crown preparation is planned, for
example, the cervical shade should also be determined.
In order to achieve the best possible true-to-nature results,
shade determination should be carried out at daylight.
Furthermore, the patient should not wear clothes of intensive
colours and/or lipstick.
Fabricating the model
Fabricate a master model or a model with detachable segments
according to the impression in the usual manner. Generally, a sealant
for surface hardening should be applied once the preparation mar-
gins are exposed.
The directions of the manufacturers of the different CAD/CAM
systems regarding the plaster to be used must also be observed for
the use of Telio CAD blocks.
Important for die preparation:
• Check the radius of the incisal/occlusal edge on the prepared dies
(maxilla and mandible).
• The prepared incisal edge should be at least as thick as the dia-
meter of the bur used in the cavity during the CAD/CAM process.
If the incisal edge of the prepared die is more pointed and thinner
than the diameter of the bur, the incisal edge has to be blocked
out accordingly.
• Also observe the information provided by the manufacturer of the
CAD/CAM system regarding the die geometry.
Clinical
working
steps,
technical
fabrication
pr
ocess
11