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32 dasdental labor · LXII · 5/2014
Technology All or nothing
W hile the Ceramill Motion
starts the calculated mil-
ling path and mills the fra-
meworks from the blank, the dental
technician can turn to another case.
This allows the technician to utilise the
working time effectively.
After the bridges have been milled
from the blank, the connectors can be
separated using a tungsten carbide
cutter and the frameworks removed
from the blank (Fig. 1). Before sinte-
ring, the connection points of the
connectors should be trimmed and
then these areas smoothed using a
soft polisher with a medium grit size
(Ceramill Polish-kit Lab) (Fig. 2 to 3). At
this working stage the slightly over
contoured crown margins are taken
back and thinned.
The still “soft” presintered zirconium
can be reworked very precisely using
low speed and minimal pressure appli-
cation. The next working stage is deci-
sive: the grinding dust should be remo-
ved from the surface using a brush.
The same procedure is carried out on
the inside of the crown. This prevents
firmly fired zirconium dust impairing
the fit after sintering (Fig. 4).
Staining
The frameworks are now air dried
using compressed air and immersed in
the colour solution. The frameworks
must be completely immersed in the
liquid for 10 seconds before they are
removed again from the solution (Fig.
5 and 6). The surface of the frame-
works must be thoroughly dried before
the sinter beads can be positioned on
them in the sinter tray (Fig. 7). The fra-
meworks are best dried using a soft
paper towel, which absorbs the last
traces of moisture.
The way to aesthetically
functional anterior resto-
rations using the Ceramill
CAD/CAM system is almost
complete. The final part
of the series shows the
milling of the framework
in the Ceramill motion, pre-
paration for sintering and
the final check of fit and
function
Authors:
Dietmar Schaan,
Master Dental
Technician
Knut Miller,
Dental
Technician
Koblach/Austria
Indexes:
Ceramill
Motion
Cutters
Staining
Sintering
Fitting
Polishing
The way to functional and aesthetic anterior restorations, Part 5
All or nothing
e Fig. 1 Separating the finished milled
bridges from the blank
Fig. 1