Ivoclar Vivadent IPS e.max Press Abutment Solutions v.2 - Manual (Page 14)

14
Sprueing
Please observe the following notes when attaching the sprues to the abutment or the abutment crown:
– Depending on the number and size of the objects to be invested, either the 100 g or 200 g IPS Investment Ring System
is selected. Before sprueing, weigh the ring base and record the weight (seal the opening of the ring base with wax).
Please note that the mixing ratio of the investment material is different for the various restoration types (e.g. inlays,
crowns, abutments).
– Use a 2.5­mm­wax­wire for sprueing.
– For abutments, the sprue is attached to an axial surface.
– For abutment crowns, the sprue is attached to a cusp.
– Align­the­wax­wire­as­parallel­as­possible­to­the­screw­channel­in­order­to­prevent­the­investment­material­
from­fracturing­in­the­screw­channel.
– The maximum length (object + sprue) of 16 mm must not be exceeded.
– Place the object on the investment ring base in such a way that the screw channel is parallel to the outer wall of the
investment ring. As a result, the investment material can subsequently be filled evenly and in a controlled manner. The
objects could be placed in a tilted position on the investment ring base, but this may lead to difficulties during investing
(e.g. bubbles in the screw channel).
– Observe a distance of at least 10 mm between the object and the silicone ring.
– If only one object is invested and pressed in an EP500 furnace, a second short (blind) sprue must be placed. This ensures
that the switch-off function of the furnace works properly at the end of the pressing procedure.
Attach the sprue to a circular area of the abutment model and as parallel as possible
to the screw channel. Use a 2.5 mm wax wire.
Place the object on the investment ring base in such a way that the screw channel is parallel to the outer wall of the investment ring.
As a result, the investment material can subsequently be filled evenly and in a controlled manner.
Furthermore, this reduces the risk of the investment material breaking in the screw channel while the ceramic material is pressed.
Attach the sprue to an oral cusp of the abutment crown and as parallel as possible to
the screw channel. Use a 2.5 mm wax wire.
ø 2.5 mm ø 2.5 mm