Preparing For Bridges; Fabricating The Framework; Scanning, Designing And Milling; Finishing The Milled Restoration - DENTSPLY Crypton Instrucciones Para El Uso

Preparing for bridges

For the preparation of bridges, the same
recommendations with regard to reductions and design
features apply as when preparing for single crowns.
The taper of the preparation is of vital importance for
bridges, as it ensures that all die geometries of all bridge
abutments have good manufacturability.
Parallel or very steep preparation surfaces can result in
an inaccurate fit on reproducing the internal surfaces of
the restoration.
The taper of the corresponding conical surfaces of all
bridge abutments should be at least 6°.

6 Fabricating the framework

Scanning, designing and milling

For more details, refer to the manual for the CAD/CAM
system used.

Finishing the milled restoration

Wear personal protective equipment!
After completion of the milling process, but prior to
sintering, separate the restoration with a diamond
cutting tool in a turbine with ample irrigation in a
grinding and polishing box. Subsequently, finish and
smooth the connector attachment areas of the
connectors, also with ample irrigation. Adequate
irrigation is mandatory to avoid dust formation. Clean
and dry the working work after each use and do not
allow the dust and chippings to dry.
Further finishing is not recommended, as the material is
very soft before sintering. Use separate diamond cutting
and grinding tools for working on Crypton.
Once the connector attachment areas are smooth, clean
the restoration under running water and blow dry with
compressed air.
Make sure that there is no milling or grinding residue on
the inside of the crowns or bridge abutments.
Any residue would become encrusted during the
sintering process and adversely affect the fit of the
restoration.

Sintering

Sinter the dry Crypton for inLab frameworks in a
low-pressure argon atmosphere.
Sinter the objects exclusively in a Crypton sintering
furnace.
– Use only the recommended sintering trays
and sintering beads of the type specified
for the respective high-temperature furnace
for sintering Crypton frameworks.
– Make sure that the frameworks are fully submerged
(up to the crown margins) in the beads.
– No sintering beads must be present
inside the crowns, as this would interfere
with the sintering shrinkage.
– Remove beads in the interdental spaces
by means of a probe, so that unimpeded
sintering shrinkage may take place.
– If multiple restorations are sintered at the same
time, these may not touch each other.
Crypton for inLab | 14
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