Dental Asia Jul/Aug 2017 - page 64

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DENTAL ASIA
JULY / AUGUST 2017
T
he CAD/CAM-based in-house production of crown
and bridge frameworks made of non-precious metals
(NPM) has opened up new possibilities at the dental
laboratory for some time now, as it presents a faster,
more economical, and more reliable alternative to
conventional casting methods. The scope of this option is now
further extended by the new inCoris CCB NPM blank (Dentsply
Sirona) that allows the fabrication of wide-span NPM restorations
using the inLab MC X5 5-axis milling unit.
Label Extensions for
Sintered Metal Restorations:
Accommodating small to
large base-metal bridges
by
Mr. Jens Richter
BEHIND THE SCENES
Fig. 3
Fig. 4
Fig. 5
Fig. 1
Fig. 2
Case 1
The patient presented at the dental practitioner’s office with a
failing bridge in her upper left quadrant (teeth 22 to 26). Due to
agenesis of the canine, a four-unit bridge with one pontic at site
25 was required. As the patient wished to bring the cost down as
low as possible, the dentist agreed to provide a veneered bridge
with a NPM framework.
The bridge restoration was first defined in the inLab CAD SW 16.0
software (Dentsply Sirona CAD/CAM) (Figure 1), choosing the
new inCoris CCB blank for the framework (Figure 2). The digital
impression of the intraoral situation taken at the dental office
using the CEREC Bluecam intraoral camera (Dentsply Sirona) was
transferred to the inLab CAD SW16.0 to the dental laboratory online
via the Sirona Connect Portal (Dentsply Sirona).
A virtual version of the master model, including segmentation and
sprueing, was created for subsequentmountingon theperforatedplate
Fig. 6 Fig. 7
Fig. 8
Fig. 10
Fig. 12
Fig. 11
Fig. 13
Fig. 9
(Figures 3 to 5). The model data was exported in STL format by
way of the interface module of the inLab CAD software and used
for in-house production of the physical model with a 3D printer
(Figure 6). The model axis, the jaw ridge line, and the insertion axis
were defined in the inLab CAD SW 16.0 software (Figure 7).
Thanks to its integrated biogeneric function, the CAD software
supplied a design proposal. Only minor modifications were
made: the contact points were individually adjusted and the
framework wall thickness was somewhat reduced (Figures 8 to 11).
At the end of the design process, the connector lines were adjusted
(Figures 12 and 13).
Thefinal checkwasperformedon thepreviewscreen (Figure 14), from
where the data was exported to the inLab CAM SW 16.0 software
(Dentsply Sirona). In the current version of the CAM software,
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