Bridges
a) A casting cone can be dispensed with.
b) Provide with sprue system indirectly so the
melt does not flow directly into the object,
but first fills the distribution channel.
c) Reinforce distribution channel in the case
of full pontics (the volume of the reinforce-
ment must correspond at least to the vol-
ume of the full pontics).
d) Dimension the distribution channel gener-
ously and allow it to project to enable sub-
sequent suction of liquid melt.
e) Maintain small spacing between object and
mould bottom and wall (5 mm).
Follow the instructions of the alloy manufacturer
with regard to dimensioning sprue systems and
sprues.
Crowns
a) Prevent the melt from flowing in directly
through sinuous sprue system.
b) Extend sprue beyond the sprue system of
the crown.
c) Maintain small spacing between object and
mould bottom and wall (5 mm).
Follow the instructions of the alloy manufacturer
with regard to dimensioning sprue systems and
sprues.
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