Investing

The secondary crowns are invested with rema^® TT. This investment material is highly suitable for casting CoCr telescopes due to its high overall-expansion and a fine corn size. The special hints for the concentration of the mixing liquid must be observed inside the instructions for use.

A control cylinder (available at company Dentaurum) can be used to check the expansion values.

Important hints in order to achieve a precision fit:

handling of the resin
working temperature of powder and liquid (20 – 22° C)
precise mixing ratio of powder and liquid
constant mixing times
muffle system (with metal ring, ring-free, ring size 3 or 6)
speed preheating or conventional preheating
investing under pressure (higher concentration of the liquid)
components of the alloy
diameter, length and wall thickness of the crowns (in case of narrow dies or thick crown walls increase the concentration of the mixing liquid)

Telescopic crowns

Investing

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