Page 24 - CEREC Q1 | 2014
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CERECDOCTORS.COM
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QUARTER 1
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2014
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S K R A M S TA D
As mentioned previously, this restoration was designed
to be a screw-retained hybrid abutment crown. In the Mill
Phase of the software, you can see where the crown is posi-
tioned in the abutment block and specifically where the
screw access is located (in red) on the lingual (Fig. 17). If
a hybrid abutment and separate crown would have been
chosen for this restoration (cement-retained crown), we
would have split the restoration in the Design Phase and
milled both elements separately (Fig. 18).
The restorationwas milled out of an A3 A16 LT e.max CAD
abutment block and tried on the Sirona TiBase to verify fit
(Fig. 19). After final contouring and characterizing, the resto-
ration was stained, glazed and crystallized (Ivoclar CS oven).
(Note: Ivoclar Vivadent manufactures specific crystalliza-
tion pins for the Abutment blocks.)
The final crystallized restoration was placed in an ultra-
sonic bath for five minutes to remove any debris, and then
prepared for bonding by etching with hydrofluoric acid for
20 seconds, rinsing and applying Monobond Plus (let sit for
60 seconds prior to drying).
To prepare the Sirona TiBase for bonding, the surface
above the shoulder must be sandblasted with aluminum
oxide (surface below shoulder should be blocked out with
wax or another agent that inhibits the attachment frombeing
sandblasted). Next, apply Monobond Plus on the TiBase and
let sit for 60 seconds before drying. Finally, bond the final
hybrid abutment crown to the TiBase withMultilink Hybrid
Abutment cement. After self-polymerization of the cement is
complete, polishing of the junction is complete with rubber
wheels and polishing points.
The final patient appointment is the best part of the entire
process. Nothing is as simple as removing the provisional
and screwing in the final restoration (Figs. 20-21). The
lingual screwaccess holewas restoredwithTeflon tape and a
bonded composite. This restoration requiredno adjustments,
a testament to the integrated digital process.
There are very few products released that not only make a
process more efficient and predictable, but also change the
mindset of an entire procedure. IPS e.max Abutment blocks
not only accomplish that, but do so at a total cost that is less
than a stock abutment. Sirona Dental Systems and Ivoclar
Vivadent have created a completely integrated digital solu-
tion that allows the dentist total control of the procedure
from start to finish. This benefits both the practitioner and
patient, but most of all, eliminates the confusion associated
with restoring implants.
For questions and more information, Dr. Skramstad can be
reached at
.
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18
19
20
21
Fig. 17: Restoration placed in
abutment block
Fig. 18: Crown and abutment split
Fig. 19: Verifying fit
Figs. 20-21: Restoration seated
