Ivoclar Vivadent IPS e.max Clinical Guide - Manual (Page 11)

11
Practical procedure for restorations with IPS e.max | Preparation
Inlay, onlay
– Make sure that the preparation margins are not located in the area of static or dynamic
antagonist contacts.
– Ensure that the preparation depth is at least 1.0 mm and that the width of the isthmus is
at least 1.0 mm in the fissure area.
– Prepare the proximal box with slightly diverging walls and observe an angle of 100 to 120 degrees
between the proximal cavity walls and the prospective proximal inlay surfaces. Avoid marginal ridge
contacts on the inlay in case of pronounced convex cavity walls without adequate support by the proximal
shoulder.
– Round out internal edges in order to prevent stress concentration within the ceramic material.
– Do not prepare slice-cuts or feather edges.
– Provide at least 1.0 mm of space in the cusp areas for onlays.
Starting situation Opening the cavity Open cavity Proximal
extension
Proximal:
box preparation
Proximal:
box preparation
Smoothing the cavity and
proximal boxes
Finished and smoothed
preparation
1.0
1.0
6°
100-120°
6°
1,0
1,0
LS
2
Clinical pictures: Prof. Dr D. Edelhoff, Germany