Ivoclar Vivadent IPS e.max ZirPress - Manual (Page 23)

23
The following sprueing guidelines must be observed:
Investment Ring System
Diameter of the wax wire
Length of the wax wire
Length of the wax wire including
waxed-up object
Sprue attachmenet point at the
waxed-up object
Sprue angle to the waxed-up
object
Sprue angle to the ring base
Design of the attachment points
Distance between the objects and
the sprues
Distance to the silicone ring
Note
Single-Tooth Restorations
100 g, 200 g, 300 g
3 mm
min. 3 mm, max. 8 mm
max. 16 mm (100 g, 200 g)
max. 20 mm (300 g)
thickest part of the wax-up
axial
45–60°
round and slightly tapered,
no sharp angles or edges
min. 3 mm
min. 10 mm
(check with the IPS Sprue Guide)
Bridges
200 g, 300 g
3 mm
min. 3 mm, max. 8 mm
max. 16 mm (200 g,)
max. 20 mm (300 g)
bridge abutments and
each bridge pontic
axial
45–60°
round and slightly tapered,
no sharp angles or edges
min. 3 mm
min. 10 mm
(check with the IPS Sprue Guide)
Larger bridges may also be placed in
the center of the investment ring.
On the selected IPS investment ring base, attach sprues in the direction of flow of the ceramic and to the thickest parts of the restorations.
Correct sprueing is checked using the IPS Sprue Guide.
C
li
n
ic
a
l
S
te
p
s,
F
ra
m
e
w
o
rk
P
re
p
a
ra
ti
o
n
,
C
o
n
to
u
ri
n
g
,
P
re
ss
in
g
P
ro
ce
d
u
re
Tip
To faciliate divesting, the position of the objects can be marked on the ring base with a
little wax prior to investment.