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The final restoration
protocol made
use of intraoral
scanning, dental
CAD/CAM and 3-D
printing to deliver
the final prosthesis
in just three
appointments.
Figure 25: Utilizing the scans of the provisional overdenture, opposing denture and edentulous arch with scanning
fixtures, the laboratory used CAD to design the titanium framework and final prosthesis.
in dental CAD using the scans of the
provisional prosthesis and opposing
denture as design guides (Fig. 25). The
intersecting volume of the milled bar
was then subtracted from the bottom
of the denture to complete the design.
After design, a 3-D model of the final
denture was printed (Fig. 26), and the
titanium bar was milled (Fig. 27). The
denture and bar were mated together,
and a denture mold was made from the
assembly (Figs. 28, 29). After removing
the printed denture model from the
mold, denture teeth were inserted
into the mold, and then affixed to the
milled bar with wax (Fig. 30).
Figure 26: CAD/CAM software and a 3-D printer
were used to produce a prototype of the final prosthesis.
Figure 27: The denture framework was milled from
titanium for a precise fit of less than 20 microns.
❯ Second Appointment
An appointment was made for try-in
of the denture setup. After removing
the provisional prosthesis, the denture
setup was placed with one screw
tightened on the milled bar, and radiographs
were taken to verify passive fit
of the substructure (Figs. 31a–31c). The
denture setup was checked for proper
fit, and a small adjustment was made.
Then, the provisional was reinstalled
and the verified denture setup was
sent back to the lab.
28 29
Figures 28, 29: A mold was fabricated from the combined titanium bar and final denture model.
– Reducing Treatment Time with Digital Dentistry – 43