CEREC doctors.com - Q4 2016 - page 52

50 | CERECDOCTORS.COM | QUARTER 4 | 2016
M AT E R I A L S | | | B Y D E N N I S J . FA S B I N D E R , D . D . S .
long-term clinical success with chairside cad/cam restorations can be influenced by a variety of factors,
including the tooth preparation, restorative material selected, processing technique, delivery mode and clinical application.
The desire to have some type of physical property that is predictive for clinical success has long been sought after in dentistry
— with no real success to date.
Concepts for Maximizing Longevity
With High-strength Ceramic
Restorations Using Celtra Duo
Is There a Physical Property That Is Predictive for Clinical Success?
However, the most commonly
perceived predictor for clinical success
is strength of the material. This is
probably due to the fact that the most
common cause of clinical failure for
chairside CAD/CAM restorations is
chipping or fracture of the restoration. It
would seem logical, then, to assume that
improving the strength of the material
woulddecrease the riskof chippingand/
or fracture of the restoration, leading to
improved clinical success. However,
there are many more factors involved in
determining clinical longevity.
High-strengthceramicshavebecome
very popular materials for chairside
CAD/CAM restorations, accounting
for the vast majority of restorations
currentlydelivered throughtheCEREC
technique. The interest in this category
of materials has lead to the introduc-
tion of newer, higher-strength ceramic
materials. Celtra Duo is a one such
newer, high-strength ceramic block
that is zirconia-reinforced lithium sili-
cate (ZLS). The 10-percent-dissolved
zirconia reinforces the glass matrix,
leading to a very fine microstructure
that allows a high flexural strength,
while at the same time also providing a
high percentage of glassy matrix. This
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