Page 9 - Dental Technology June 2022

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cosmetic section 09
DENTAL TECHNOLOGY, APRIL-JUNE 2022

MANUAL OPERATIONS: SET-UP AND TRY-IN IN THE MOUTH
First it was necessary to fabricate a setup, based on prosthetic
fundamentals. For this purpose, classic resin teeth were used.
Teeth have a natural anatomical shape and you can choose
between different morphologies. Within a comparatively short
time, the set up was ready. We intentionally used a charismatic
tooth arrangement, since this emphasizes the individuality of
the patient (Figures 2a and 2b).
Many patients want a well-made prosthesis that functions
well. The dental technician can deliver this criterion using aes-
thetics and function that are confirmed in the mouth. The
patient was satisfied with the final result.

DIGITAL OPERATIONS: MANUFACTURING
Since in the individual "details" of a mounting of teeth activity
dental technician's manual is indispensable, in the realization of
the travata we give preference to the CAD/CAM technology.
The set-up confirmed in the mouth was then transferred to the
CAD software and on this base was built the beam with a shape
of the teeth shrunken by the anatomical point of view (Figures
from 3a to 3c).

FIG 3a - 3c: The digitized set-up served as the basis for the construction of the beam
(reduced crown shape and reduced gingiva)

KNOW-HOW IN THE CHOICE OF MATERIALS
Dental technicians want to imitate nature. In this respect they
should not only consider aesthetics, but also take into account
the characteristics of mechanical materials. The possibilities are
more diverse than ever. For example, high performance modern
polymers belong to a group of materials with high potential. In
many cases, a polymer-based prosthesis can be more suited to
hard, rigid materials, such as metal or ceramics. An example is
implant-prosthetics: the stress factors can be reduced and
spread out thanks to a beam material with a modulus of elastic-
ity similar to that of bone. Polymer-based CAD/CAM belongs to
the PAEK (polyaryleterchetone), group of materials - see the
paragraph "About the PAEK materials"

ABOUT PAEK MATERIALS
The company EADT e.V. describes PAEK materials with the fol-
lowing convincing definition: "Currently polyetheretherketone
(PEEK) is the best known representative of PAEK materials in
dentistry. In addition to PEEK, there are other modifications of
the material.
These are distinguished by a variation of functional groups in
the polymer chain. In this way you can change the characteris-
tics of the material and adjust them as you please. In compari-
son to PEEK, the polyethercheton ketone (PEKK) is formed from
a single group of two groups of ketones. In this way the poly-
mer becomes a little stiffer, but optical features and chemicals
still resemble each other. For both variants there are numerous
indication fields, for example, crown and bridge, prosthetic
bases and hooks for prostheses, implant abutments and tele-
scopic elements.
Currently, PEKK is offered by only one manufacturer, i.e.
from the company Cendres+Métaux under the name Pekkton
Ivory. To optimize mechanical features, the material is filled
with TiO2. Pekkton ivory contains about 10% TiO2 weight opti-
cally distinguished by a slightly grayish character. The material
is suitable for different indications with reference to ductility