Dental Asia May/June 2021

Behind the Scenes
Despite the long-term success of CAD/
CAM, many dental laboratories still
use wax for modelling, investment,
burning out and pressing to manufacture
all-ceramic restorations. That is the reality of
the situation.
Master Dental Technician Jürgen Freitag from
Bad Homburg, Germany, has already used
the new VITA AMBRIA press ceramic for more
than 50 restorations on 20 different patients.
In this interview, he shares his experiences
using the new material and describes his allceramic
protocol in conjunction with the VITA
LUMEX AC universal veneering ceramic.
Mr Freitag, switching to the VITA AMBRIA
lithium disilicate for your press ceramic,
have your work methods changed as a
result?
My general work methods have not changed
at all with VITA AMBRIA. I simply use the
corresponding system components such as
the investment ring, investment materials,
liquid and plunger according to the working
instructions. There was also no difference in
the processing time.
Positive changes include the precision, vivid
aesthetics, and shade accuracy matching
the VITA shade standard that I am able to
achieve.
What were the press results like after
devesting, and what did you notice
during the finishing process?
The reaction layer is minimal. During
devesting and sandblasting, the material
proved highly robust. I didn’t have to pay as
much attention as I usually would with other
press ceramics.
During the testing phase, I used strong
sandblasting at 2.5 to 3 bar with a particle
size of 110μm without experiencing any
negative effects.
According to the usage instructions, the
particle size should only be 50μm and the
pressure 4 bar. Even when working with
abrasive rubber polishers, the material proved
to be extremely stable.
What was your experience with the fit and
marginal seal in the laboratory and on the
patient?
Because the reaction layer is minimal, the
restoration margins are clearly defined. The
interaction of the investment material and the
glass ceramic leads to dimensionally stable
results.
After the finishing, I put the restorations on
the model and they fit. I received the same
feedback from the dental practice. There were
no problems with the fit during the integration
process, even with total reconstructions that
were more complex.
What possibilities do you see with the
interplay between VITA AMBRIA press
ceramic and the new VITA LUMEX AC
veneering ceramic?
I have never truly experienced this kind of
modelling quality. Due to the particle size,
the veneering materials can be modelled
with a gentle touch. In combination with the
outstanding stability, I am able to achieve the
shape faster with fewer adjustments.
The cut-back with VITA AMBRIA and the
individualisation possible with VITA LUMEX
AC make it a true model of the future for me,
helping me to achieve high aesthetics quickly
and reliably. DA
Published in ZAHNTECHNIK MAGAZIN
07/2019, Spitta GmbH, Germany
VITA ® and other VITA products mentioned are
registered trademarks of VITA Zahnfabrik H.
Rauter GmbH & Co. KG, Bad Säckingen, Germany.
© Jürgen Freitag
© Jürgen Freitag
Veneers and full crowns, made with VITA AMBRIA and
VITA LUMEX AC, display an optimal fit and a versatile
interplay of shade and light
VITA LUMEX AC enables highly precise modelling thanks to
outstanding stability and based on optimal interlocking of
the ceramic particles through ideal particle size distribution
Cemented partial crowns on tooth 11 and 21 integrates
harmoniously with the natural tooth
DENTAL ASIA MAY / JUNE 2021 67