Dental Asia Jul/Aug 2017 - page 73

Fig. 3: Ready, steady, go: At ten
o’clock sharp the participants are
allowed to see the models of the case.
These include a study model of the
provisionally restored upper jaw and a
silicone matrix, a sawcut model of the
prepared upper jaw as well as model of
the lower jaw.
Figs. 9 to 11: The modelled crowns, reduced crowns and frameworks are
conventionally invested, placed in the pre-heating furnace, pressed, divested and
then completed. The participants are well-versed in this technique and achieve
the desired results in no time at all.
Figs. 12 and 13: — Manual finishing
techniques: Mr. Velimir Žuji´c sprinkles
dentin powder on an IPS e.max Press
framework that has been coatedwith
IPS Ivocolor
Mixing Liquid allround.
In the wash firing cycle, the bond is
reinforced and produces a sound base
for the subsequent ceramic layers.
Fig. 14: From the computer to the
hand: Some of the technicians of the
CAD/CAM group decided to choose
the monolithic route. Nevertheless,
they are doubtful about being able to
outcompete the manual group. They
would have to wait until the end to
find out if their doubts were justified.
Fig. 15: The press technique is also
highly efficient when the restorations
are pressed to full-contour and then
minimal layers are applied to add fine
details. Since only a minimum amount
of layering ceramic is applied, there is
hardly any shrinkage and the results are
highly predictable.
Fig. 17: Checking the length and
alignment of the all-ceramic crowns in
the articulator. Themarks on thewax-up
serve as a guide. It’s difficult to believe
that all these steps can be accomplished
by a machine.
Figs. 20 to 21: Not toworry, themembers of the CAD/CAMgroup aren’t spending
all their time staring at their computer monitors. They’re also having fun and
taking care of some stepsmanually. In the end, it’s not themethod that counts,
but the result, which has to look as natural as possible.
Fig. 22: And thewinner is the Slovakian dental
technician Mr. Martin Ebringer from the
conventional fabrication group. The patient
immediately fell in love with his crowns.
They are sparingly layered. Mr. Martin
Ebringer focussed on imitating the surface
characteristics and the tooth shape. When
he was asked about how he had managed
to produce such a fantastic result, he simply
said that he had talked with the patient and
tried to create what she wanted: in other
words, very bright, monochromatic teeth.
Consequently, he tried to impart the teeth
with a natural appearance by incorporating
morphological details.
Fig. 16: The contestants in the
conventional group brought out
the best in the IPS e.max materials.
Here, one of the participants builds
up the incisors to full contour on IPS
e.max Press MO frameworks.
F i g s . 1 8 a n d 1 9 :
Mr. Ondˇrej Adamhard at
work. Inorder to faithfully
recreate the translucent
edge of the lower front
teeth in the upper jaw, he
completely veneers the
upper incisors. The result
after the first firing cycle
is shown in the picture.
Fig. 4: The CAD/CAM laboratory
group has selected the digitalised
situation and generated the case in
the system. In other words, the teeth
to be restored and the restorations
have been defined in the software.
The picture showsMr. DavorMarkovic
studying the case.
Fig. 6: Dr. Petr Hajný and his assistant
scan the patient’s jaw with the
CEREC Omnicam (Dentsply Sirona),
an intraoral dental scanner which,
like the Triosmachines (3Shape), does
not use powder. He takes advantage
of chairside workflows to design the
crowns and mill them from IPS e.max
Fig. 7: CAM software of the Wieland
Zenotec select CAD/CAM system with
the IPS e.max block in the block holder.
Fig. 8: Completed, milled crownmade
of IPS e.max CAD MT blocks in the
CAD/CAM milling machine.
Fig. 5: The dental technicians provide
the photographer with a lot of very
interesting material. The dies are
prepared for the creation of the
restorations and the silicone matrices
have been adjusted accordingly.
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 18
Fig. 20
Fig. 19
Fig. 21
Fig. 22
Fig. 13
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