Processing Information; General Preparation Instructions; Framework Dimensions For The Anterior And Posterior Regions; Additional Dimensional Requirements For The Posterior Region - DENTSPLY Crypton Instrucciones Para El Uso

5 Processing information

General preparation instructions

The preparation margin should be designed as a
chamfer As the finish line inside chamfer or a shoulder
with a rounded internal line angle. Other guidelines:
– The vertical preparation angle should be at least 3°.
– All lines and line angles should be rounded.
– The cusp-fossa profile relief should be flattened.
The minimum wall thickness of the restoration depends
on indication.
Framework dimensions for the anterior and
posterior regions
Wall thickness, single crowns
Margin thickness, single crowns
Wall thickness, bridges
Margin thickness, bridges
Additional dimensional requirements for the
anterior region
Number of pontics
Connector cross-section
Additional dimensional requirements for the
posterior region
Number of pontics
Connector cross-section
Cantilever pontic at tooth
position (only one pontic,
up to one premolar width)
Connector cross-section
for this cantilever pontic
0.4 mm
0.2 mm
0.5 mm
0.2 mm
2
6 mm
2
2
9 mm
2
Up to the second
premolar
12 mm
2

Preparing premolars and molars

For veneered posterior restorations, the minimum
occlusal thickness of the veneer must be 1.0 mm
throughout. Given the minimum coping wall strength
requirements, it is advisable to reduce at least 1.5 mm
on the occlusal aspect.
The taper of the prepared surfaces should be 6° – 8°.
Transitions between axial walls and occlusal surfaces
should be rounded, with the occlusal profile a simplified
representation form of the occlusal surface.
An opening angle of the occlusal surfaces of 120° – 140°
ensures an exact reproduction of the internal surfaces of
the restoration during milling and facilitates a good
internal fit.

Preparing anterior teeth

For veneered anterior restorations, the minimum circular
reduction must be 1.0 mm throughout; in addition, the
taper of the prepared axial surfaces must be 6° – 8°.
All transitions between the axial, the palatal, and the
incisal surfaces must be rounded.
For aesthetic reasons, the incisal reduction should be
2.0 mm. For CAD/CAM restorations, the minimum width
of the incisal edge in a vestibulo-oral direction should be
at least 0.8 – 0.9 mm to ensure accurate reproduction of
the internal surfaces of the restoration by the milling
unit.
Crypton for inLab | 13
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