Dental Asia May/June 2021

Behind the Scenes
Based on the ideal situation already
worked out, a new scan was performed
(Figs. 1-3).
After completing the scanning process,
the frame was virtually adapted. The
design of the bridge framework was
started in the software.
As this was to be manufactured from the
millable Ceramill Sintron sintering metal,
the corresponding material parameters
had to be observed.
Initially, we designed a reduced wax-up
(Fig. 4). We reduced the tooth sections
so that the shape resembled a prepared
stump.
The gingival portion was also defined.
We had adopted the model, gingiva and
abutment situation for the scan.
Then, we screwed the matching
scanbodies onto the model analogues.
Due to the strong angulation of the
implant at 26, a 20° angled Camlog
titanium base had to be used.
This made it possible to optimise the
emergence of the occlusal screw
connection in the occlusal surface
(Fig. 5).
PERFECT SYMBIOSIS OF
STABILITY AND AESTHETICS
For stability, Ceramill Sintron was used as
material for the bridge framework.
This is a so-called sintering metal, which
in its raw state has a wax-like consistency
and can be easily processed with desktop
milling machines.
As a result, the workflows have become
more efficient with significant increase in
the safety of the work process.
Sintering the milled structure led to a
biocompatible, stable, homogeneous
and distortion-free cobalt and chromium
(CoCr) frame (Figs. 6-7).
Hence, the casting and labour-intensive
finishing of CoCr is no longer necessary.
After checking the fit, we polished the
base to a high gloss and bonded the
bonding bases to the frame. Now, the
Sintron structure could be screwed onto
the model (Figs. 8-9).
This situation now formed the basis
for the aesthetic finalisation of the
superstructure.
The model including the Sintron bridge
was duplicated and another saw
model was produced; allowing for the
preparation margin of individual crowns
to be better displayed and checked.
This saw model was scanned and the
data obtained “matched” with the CAD
data of the temporary bridge enabling us
Fig. 10: For the construction of the single
crowns, the frame was duplicated together with
the model and a saw model was fabricated and
scanned in
Fig. 11: The anterior teeth were labially reduced and the
posterior teeth were fully anatomically designed and
milled
Fig. 12: The crowns were milled from the super highly
translucent zirconium oxide Zolid FX Multilayer
Fig. 13 Fig. 14 Fig. 15
Figs. 13-15: The finished ceramic crowns were bonded to the conditioned Ceramill Sintron frame using Multilink Hybrid Abutment
DENTAL ASIA MAY / JUNE 2021 63