Page 14 - CEREC Q1 | 2014
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Fig. 1: Diagram of a
Vickers stylus
Fig. 2: SEM pictures
of materials sub-
jected to Vickers test
( from left to right)
IPS Empress; VITA
Enamic; Lava
Ultimate
transitions
to
minimize
stresses, Dr. Christensen
haswarnedabout placing
tertiary anatomy into
our ceramic restora-
tions. These, she stated
in her presentation
at the first CEREC
Owners Symposium,
led to points where
“you can’t glaze this material!”
“How can we characterize it in a
predictable and long-lasting manner?”
“Well, I guess I can use it on second
molars.”
These are some comments made
about many of the new materials that
our material partners have brought
to the table over the past few months.
These are also comments that have
gone through my head when evaluating
whether or not they can fit into my day-
to-day practice.
These newer materials, Lava Ulti-
mate and VITA Enamic, are a new
class of hybrid material that offers
some physical and time-management
advantages. Removing the need to crys-
talize or stain and glaze can save the
dentist many minutes over the other
ceramic materials we presently use. But
does this material come at a cost to the
esthetic?
To answer this question, we need to
first evaluate a few things, including
what has been taught in the past, how
the materials we had available then
performed in the mouth over time and
the characteristics of those materials
such as strengths and weaknesses.
Hybrid Material—A Paradigm Shift?
Evaluating Some New Restorative Materials for CEREC
M AT E R I A L S
| | |
B Y P E T E G A R D E L L , D . D . S .
1
2
ks could initiate and then propa-
, possibly leading to the fracture of
restoration as our patients function
para-function in their daily life.
e all want our restorations to be as
ng and as long-lasting as possible,
we are also a group that wants to
create beautiful restorations that mimic
nature. This leads us down the path of
being an illusionist, using satins and
glaze to fool the eye. This creates a need
for a material that can be fired.
With our restorations, the material we
are trying to recreate is enamel, a semi-
transparent material that, for many of
the teeth we treat, is monochromatic.
The differences we see in natural teeth
are due to texture, contour and the
underlying dentin. The enamel is thin
in anterior teeth on the incisal, so the
darkness of the back of themouth comes
through; in the cervical one-third, the
enamel thins out, allowing the dentin
to influence the color of the tooth. For
posterior teeth, the deeper grooves
change the way light reflects, darkening
the occlusal table as you move your eye
to the center.
With the ceramics we use, we need
These newer materials,
Lava Ultimate and
VITA Enamic, are a
new class of hybrid
material that offers
some physical and
time-management
advantages.
