Basic principles: Wax-up
After the crucible is opened, the melt flows into the
mould through gravity and immediately fills the
sprues. Immediately after that the entire mould
cavity is swiftly filled with the hot melt by means of
compressed air. The object should first harden and
must enable subsequent suction of the liquid melt
out of the reservoir of the sprues. The following rules
must always be observed for this purpose.
BEGO base socket mould formers are matched to
the flow of the melt from Nautilus
®
crucibles and
should therefore be used.
Do not provide with vents. Air vents cause the
compressed air to be fed incorrectly during
pressing.
The object should first harden and enable subse-
quent suction of the liquid melt from the heat centre
of the mould.
For this reason keep the spacing between the object
and the mould bottom and mould wall small (5 mm).
Arrange bridges in a ring shape at the mould wall.
Partial denture
Follow the illustrations and the instructions of the
alloy manufacturer when dimensioning the sprues.
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