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QUARTER 1 | 2014 | CERECDOCTORS.COM | 29
Fig. 1: Temporary
milled from VITA
CAD-Temp and
characterized
using VITA VM LC
Fig. 2: Initial situation:
Tooth #21 is infected and
must be extracted
Fig. 3: X-ray image of the initial situation
Fig. 4: Using VITA CEREC powder, the
upper jaw is given a matte finish prior
to scanning the initial situation
Fig. 5: Virtual reproduction of the initial
situation
Fig. 6: Preparation with a matte finish
prior to extracting tooth #21
Fig. 7: Virtual reproduction of the
preparation
Fig. 8: Following extraction, a liquid dam
is used to protect the alveolus against
contamination by the scanning powder
fracture. The material can be effectively
processed using the diamond-coated
tools provided by the CEREC systems.
The milling time per unit is approxi-
mately 15 minutes.
Based on our clinical experience, the
material has proven its worth, even
when worn over a period of up to two
years. A long period of wear of this kind
in situ may be necessary in the following
cases: for the observation of teeth with
an uncertain prognosis, or in the case
of fractionated loading of implants for
progressive bone loading in order to
build up bone substance. Long-term
temporaries are also an alternative for
patients who are currently not in a posi-
tion to finance superior-quality final
restorations.
VITA CAD-Temp multiColor blocks
are comprised of four shade layers with
differing levels of chroma and translu-
cency that simulate the shade gradient of
natural dentition perfectly. The blocks are
available in the three shades: 1M2T, 2M2T
and 3M2T, and in size CTM-40 (15.5 x 19
x 39 mm). VITA-CAD-Temp restorations
can also be easily
customized. The
incisor is reduced
for this purpose
and then remod-
eled using the
light-curing micro-
particle composite
VITA VM LC
from VITA Zahn-
fabrik (Fig. 1). This step can be delegated
to a dental assistant. (Note: If the long-
term temporary is particularly esthetic,
the standard for the final restoration is
set very high or the patient might even
decide to dowithout one!)
LONG-TERM TEMPORARIES
IN THE CASE OF TOOTH
EXTRACTION: PROCEDURE
If tooth extraction is required, there are
two approaches to fabricating long-term
temporaries using CEREC AC. These are
presented in the following case study.
The patient presentedwith an infected
tooth (#21) that needed to be removed
(Figs. 2-3). It was agreed that a long-term
temporary comprising three units should
be fabricated using VITA CAD-Temp
multiColor, and that the patient's final
treatment should then be comprised of
an all-ceramic bridge restoration.
The patient's jaw area was first given
an evenmatte finish using VITA CEREC
Powder from VITA Zahnfabrik, and
then scanned using the CERECBluecam
(Figs. 4-5). The abutment teeth #11 and
#22 (Fig. 6) were then prepared in the
next step. At this point, either the second
scan (Fig. 7) can be taken, directly
followed by extraction of tooth #21, or
the tooth is extracted before digitaliza-
tion of the preparation. The advantage
in this case is that the actual anatom-
ical situation is correctly provided
for the model. However, the alveolus
may not, under any circumstances,
become contaminated with the powder
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