Ivoclar Vivadent IPS e.max ZirPress - Manual (Page 12)

12
Anterior Region
circular
incisal
Connector dimensions
Design type
Crowns
0.5 mm
0.7 mm
–
Splinted crowns
0.5 mm
0.7 mm
7 mm 2
3-Unit Bridges
0.5 mm
0.7 mm
7 mm 2
4-12-unit bridges with
2 pontics
0.7 mm
1.0 mm
9 mm 2
Cantilever bridges with
1 pontic
0.7 mm
1.0 mm
12 mm 2
Posterior Region
circular
occlusal
Connector dimensions
Design type
Crowns
0.5 mm
0.7 mm
–
Splinted crowns
0.5 mm
0.7 mm
9 mm 2
3-Unit Bridges
Inlay-retained bridges
0.5 mm
0.7 mm
9 mm 2
4-12-unit bridges with
2 pontics
0.7 mm
1.0 mm
12 mm 2
Cantilever bridges with
1 pontic
0.7 mm
1.0 mm
12 mm 2
Minimum
framework
thickness
Minimum
framework
thickness
Supporting the tooth shape and/or gingiva (incisal, occlusal and/or basal)
Supporting the tooth shape and/or gingiva (incisal, occlusal and/or basal)
Framework Fabrication – IPS e.max ZirCAD
The individual steps for the fabrication of a framework of IPS e.max ZirCAD are described below. The
complete procedure for the processing of IPS e.max ZirCAD is described in the IPS e.max ZirCAD Instructions
for Use.
If a ZrO
2
framework of an other manufacturer is used, the corresponding recommendations regarding processing
must be observed.
Layer thicknesses
The framework design is key to the success of durable all-ceramic restorations. The more attention is given to the frame-
work design, the better the final results and the clinical success will turn out to be.
The following basic guidelines have to be observed:
– The IPS e.max ZirCAD framework material is the high-strength component of your restoration and must be
given a design that supports the overall shape of the restoration and the cusps.
– The excess in available space (severely prepared teeth, atrophied alveolar ridge) must be compensated by
corresponding framework dimensions and not by the pressed material.
– The parameters stored in the respective software are considered guidelines and have to be adjusted
according to the total thickness of the restoration using the available software tools.
– If possible, the connector design should be extended in the vertical direction, rather than in the horizontal direction.
Since the necessary connector dimensions cannot always be established in the sagittal (lingo-vestibular) directions, the
connector dimensions should always be expanded in the vertical (inciso-cervical) direction.
– A reduction in framework thickness always means a reduction in strength.
The following minimum thicknesses have to be observed for the framework design with IPS e.max ZirCAD (sintered):
Please note: The minimum dimensions of the IPS e.max ZirCAD framework must be 25% larger before sintering.
The IPS e.max ZirCAD framework must be designed in such a way that the following layer thicknesses can be observed
during the contouring for pressing on IPS e.max ZirPress:
– In order to ensure the desired tooth and gingiva shades as well as pressability, a minimum thickness of
0.7 mm must be observed.
– Unsupported press and layering ceramics must not exceed a total thickness of 2.5 mm.
Failure to observe the stipulated framework design criteria and minimum thicknesses may result in clinical failures, such as
cracks, delamination and fracture of the restoration.