Tetric EvoCeram Bulk Fill by Ivoclar Vivadent represents a
significant advancement in the field of resin-based filling materials.
What sets this composite material apart from any other is
its unique formulation designed to provide faster, more efficient
placement of direct composite restorations while sustaining
long-term clinical performance.
Unlike traditional composite formulations that may have been
simply modified to allow for placement in thicker layers and which
may result in compromised aesthetics, reduced working time, the
need for additional dispensing equipment or placement of a covering
layer, Tetric EvoCeram Bulk Fill represents entirely new technology
for the faster, more efficient placement of direct composite
restorations without compromise to any physical properties.
Three new patented technologies have been incorporated
into a well-proven nano-hybrid composite formulation: Ivocerin,
Stress Relievers and a Light-Sensitivity Filter.
Ivocerin
Ivocerin is a new germanium-based light-initiator developed
by Ivoclar Vivadent and used exclusively in Tetric EvoCeram Bulk
Fill. This new initiator allows Tetric EvoCeram Bulk Fill to cure
faster and deeper than other composite materials without having
to increase translucency or reduce working time. With Ivocerin,
Tetric EvoCeram Bulk Fill can be cured in layers of up to 4mm in
just 10 seconds (using a light with minimum output >1,000
mW/cm2.) The absorption spectrum of Ivocerin fills the "gap"
between traditional light-initiators (e.g., Camphorquinone,
Lucirin TPO, PPD) used in today’s most popular
composite materials (Fig. 1). It not only cures fast,
it cures well beyond the 2mm limit of traditional
initiators, achieving efficient polymerization
at 4mm (Fig. 2).
Stress Relievers
New fillers (pre-polymers) reduce shrinkage strain by absorbing
the stresses generated during the light-curing process.
Undoubtedly the greatest concern of most dentists and their
reason for not moving to a "bulk-fill" composite are volumetric
shrinkage and shrinkage stress. Volumetric shrinkage is not
really a concern as long as the shrinkage stress can be properly
managed. It is the stress caused during polymerization that cause
materials to pull away from cavity walls creating gaps that can
lead to marginal leakage, black lines and eventually failure of the
composite restoration.
Tetric EvoCeram Bulk Fill includes a new, additional filler
technology that is flexible and relieves shrinkage stress during
polymerization. This keeps the material from pulling away
from the walls maintaining marginal integrity on a very high
level (Fig. 3).
Light-Sensitivity Filter
Sufficient working time is critical when placing direct composite
restorations. Tetric EvoCeram Bulk Fill offers the combination
of a fast curing time with an extended working time. A
special additive, within the initiator system, delays the effects of
ambient light extending the working time. This additive acts as
a shield delaying the effects of ambient light, thus extending the
working time. However, light emitted from curing lights is able
to penetrate this shield, allowing 4mm increments of the material
to be cured in just 10 seconds
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