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24 prosthetic section DENTAL TECHNOLOGY, JANUARY-MARCH 2024

DIGITAL COMPLETE DENTURES: A REAL ALTERNATIVE

DIGITAL MOUNTING OF COMPLETE DENTURES WITH MILLED BASE AND ARCHES

ODT. MASTER MATTHIAS KLINGNER

“It would be nice to combine Zebris for FIG 1 FIG 2
Ceramill, i.e. face bow and centric and M-
Smile and FDS. As soon as this crossed my
mind, I said to myself: “Why shouldn't it
work?” Thus, was born the idea of our first
patient treatment, which combines Ceramill
FDS, Zebris, M-Smile and Ivotion.

INITIAL SITUATION
The patient has been a full prosthesis wearer
for 36 years. The state of his prosthesis was,
according to all of today’s standards, insuffi-
cient, in so far as aesthetics, vertical dimen-
sion, occlusion and retention. FIG 3 FIG 4

PREPARATION
As usual, we took an anatomical impression of
both ridges and an in-situ impression of the
old prostheses. In so doing, we have produced
the models in the traditional way and scanned
them with the Ceramill Map600.
TRAY DESIGN
To build the functional impression trays, we
designed the case as a bite in the Ceramill
database.
FIG 5 FIG 6
The base of the impression tray was there-
fore designed more or less like a bite: elimi-
nate the undercuts on the model, mark the
extension of the edges and shape them. Next
– the wax wall.
This served as a handle, cheek and lip rest
for fixing the face bow (Zebris) and for a pre-
registration. For this purpose, we have created
different building elements, valleys of differ-
ent upper and lower wax forms and a virtual
Rim former.
We uploaded this as Generic mash and
aligned it with the upper model which served
FIG 7 FIG 8
as an auxiliary plane for aligning the wax rim.
Then we printed functional trays in the
Nextdent 5100, elaborated them and adapted
a matching tray for the Zebris to simultane-
ously record the facebow during the function-
al impression (Figures 1 to 3)
FUNCTIONAL IMPRESSION, BITE
REGISTRATION AND CENTRIC
Subsequently, the study revealed the function-
al impression, pre-registration of the bite and
the application of the facebow with Zebris. FIG 1-3: Printed functional trays including coupling trays for Zebris
This worked wonderfully and was very pleas-
ant for the patient, since the impression tray FIG 4-8: Digital registration of the support pin (determination of vertical height and position horizontal bite
only had to be put in the mouth once for a
maximum of five seconds for facebow trans-
fer. In the laboratory, as usual, we performed
the functional models. Then the upper was
placed in the articulator with the transfer
table and afterwards the lower in relation to
the upper. Then we made some conventional