Ivoclar Vivadent IPS InLine System - Manual (Page 58)

58
On the IPS Investment Ring Base, always attach sprues in the direction of flow of the ceramic and to the thickest part of the restoration.
Sprueing
The diameter for the sprues is 3 mm. For multi-unit bridges, each bridge unit must be provided with a sprue. Always attach
the sprues in the direction of flow of the ceramic and at the thickest part of the wax-up so that smooth flowing of the
viscous ceramic during pressing is enabled. Depending on the number of objects to be invested, either the 100 g, 200 g, or
300 g IPS Investment Ring System is selected. Bridges must only be pressed in the 200 g or 300 g Investment Ring System.
The following sprueing guidelines have to be observed:
ring Base
Wax wire Ø
Length of the wax wire
Length of the wax wire including
waxed-up object
Sprue attachment 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
distance to the silicone ring
Important
Single crowns, Bridges
100 g, 200 g, 300 g
3 mm
min. 3 mm, max. 10 mm
max. 15–16 mm
thickest part of the wax-up; every bridge unit
in the direction of flow of the ceramic;
observe the cusp angulation
45–60°
rounded,
no angles or edges
min. 3 mm
Crowns: min. 10 mm; Bridges: 58 mm
Larger bridges may also be placed in the
centre of the investment ring.