Dentaltown March 2022 - 43

Plastic matrices: Mylar matrices are a ubiquitous
part of every clinician's armamentarium. Their many
advantages include malleability, the ability to cure
through, and the resultant highly polished surface when
cured against composite.1,2
stiffer anatomical Mylar matrices are available.
Metal matrices: Long used in posterior restorations,
Issues can arise in areas of
tight or irregular contacts, where the thin Mylar may
not be able to traverse or may warp. Also, the thin strip
may not hold its shape as readily as a metal matrix,
though there are protocols to negate this effect,3
and
Table 1
Matrix type
Plastic sectional
Examples
Bioclear, Strip crowns
Plastic full-contour
Flat Mylar, Margin Perfect
Metal sectional
Garrison, Tor VM
Metal full-contour
Toffl emire, Greater Curve,
Unica
Pros
Ability to cure through;
ease of fi ll in small spaces;
highly polished surface
Ability to cure through;
cost; thickness; highly
polished surface
Stiffness; replicates
interproximal contour
Stiffness; cost; ability to
traverse tight contacts
Cons
Thinness; cost; learning curve
May fl atten contours; may
be diffi cult to place in tight
contacts
Inability to cure through
Inability to cure through
metal matrices are increasingly used in the anterior region.
One reason is their stiffness, which will allow them to
maintain their shape when placed. Additionally, metal
matrices are often easier to place interproximally than
plastic matrices. However, light will not pass through
these matrices, so care must be taken when curing the
composite restoration to ensure full polymerization.
Matrix style
Anterior and facial matrices are primarily used in
two shape styles:
* A sectional matrix is used to restore a specifi c
portion of the tooth, such as a single proximal
surface.
* A " full-contour " matrix, in this context, refers
to one that wraps around both proximal surfaces
and encompasses the cervical portion of the
tooth. These matrices can be used to restore
proximal surfaces, as well as other restorations
such as Class Vs and full-contour veneers.
The use of heated composite with an injection
molding technique has been shown for both sectional
matrices4
and full-contour ones.5
heated composite include increased cavity adaptation,
degree of conversion and reduced polymerization
shrinkage.6
Advantages to employing
There are a number of heating units on
the market, including the HeatSync (Bioclear), Calset
(AdDent) and the Compex HD (AdDent).
Table 1 lists some advantages and disadvantages
with various types of plastic and metal matrices. The
following clinical vignettes demonstrate situations where
a particular matrix may be utilized.
dentaltown.com \\ MARCH 2022 43

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Dentaltown March 2022

Table of Contents for the Digital Edition of Dentaltown March 2022

Dentaltown March 2022 - Intro
Dentaltown March 2022 - Cover1
Dentaltown March 2022 - Cover2
Dentaltown March 2022 - 1
Dentaltown March 2022 - 2
Dentaltown March 2022 - 3
Dentaltown March 2022 - 4
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