4. Introduction
A matrix system provides and takes the place
of the proximal tooth surface that was removed
to restore the proximal contours and contact to
their normal shape and function.
5. They hold the restorative material in the
cavity, restore the tooth to original form
and preserve the arch length and
anatomic function.
The matrix band should be rigid enough
to allow adequate packing pressure,
ensuing a well-condensed restoration
free from an excessive mercury.
Should also prevent extension of excess
restorative material beyond the band
into the gingival tissue causing over
hanging amalgam restoration.
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8. 1. Matrices for Class I cavity (compound cavity)
Double banded tofflemire
2. Matrices for Class II
Single banded tofflemire
Ivory matrix No. 1
Ivory matrix NO. 8
Black's matrices
Soldered band matrix
Anatomical matrix
Auto-matrix
S-shaped matrix band
T-shaped matrix band
3. Matrices for a cavity preparation for amalgam on distal of
cuspid.
S shaped matrix
Tofflemire
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9. 4. Matrices for Class III for tooth coloured
restorations
Transparent celluloid strips
5. Matrices for Class IV for tooth coloured
restorations
Celluloid strips
Aluminum foil (non-light cure)
Anatomic matrix .
Modified S shaped band of copper, tin, aluminum
foil (non-light cure)
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10. Matrix band for primary and permanent Class
II composite & Amalgam restorations
Choosing the best matrix system for the
procedure and the patient can enhance clinical
success
11. • The amalgam restoration in the Class II cavity
needs the use of a matrix retainer. The matrix
should be rigid enough to allow adequate
packing pressure, ensuring a well-condensed
restoration free from an excess of residual
mercury.
12. • When restoring Class II with amalgam or adhesive
restorations in children, teenagers, and adults, the
goal is to provide 1) tight contacts, 2) good contours,
and 3) proper anatomy. There are many types of
matrices on the market, however, in restoring
thousands of restorations in children and teenagers,
we have found that fender mate ,segmental metal
and auto matrices provide for all three goals.
examples of available matrices.
13. Types of Matrices
w Tofflemire ( Universal retainer )
• does not fit contour of primary tooth well
• difficult to fit multiple matrices
* Spot welded requires a spot welder chairside
*T-band
w *Automatrix – Metal & Transperent costly
* Sectional
* Fender Mate
w allows for multiple matrix placement
14. Posterior Matrix System
• Universal retainer
– Also referred to as the Tofflemire retainer.
This device holds the matrix band in
position. The retainer is positioned most
commonly from the buccal surface of the
tooth being restored.
17. Posterior Matrix System- cont’d
• Matrix bands
– Matrix bands are made of flexible stainless
steel and are available in premolar, molar,
and universal sizes and thicknesses.
• The larger circumference of the band is
the occlusal edge and is always placed
toward the occlusal surface.
• The smaller circumference of the band is
the gingival edge and it is always placed
toward the gingiva.
20. Automatrix System
• The automatrix system is an alternative to a universal
retainer.
• There is no retainer used to hold the band in place.
• Bands are already formed into a circle and are
available in assorted sizes in both metal and plastic.
• Each band has a coil like autolock loop.
• A tightening wrench is inserted into the coil and
turned clockwise to tighten the band.
• When finished, the tightening wrench is inserted into
the coil and turned counterclockwise to loosen the
band.
• Removing pliers are used to cut the band.
23. Matrices for Composite Restorations
• A plastic matrix, also referred to as a
celluloid matrix or mylar strip, is used for
class III and IV restorations in which the
proximal wall of an anterior tooth is missing.
25. The Use of a Clear Matrix
• The matrix is placed interproximally before
the etching and priming of a tooth. This
protects adjacent teeth from these materials.
• After placement of composite material, a
matrix is pulled tightly around the tooth to
help reconstruct its natural contour.
• The clear plastic matrix allows the curing light
to penetrate the material and complete the
curing process.
26. Sectional Matrices
• A thin polished palodent-type band and a
tension ring produce a tight anatomic contact
for composite resin materials for class II
restorations.
27. • Sectional matrix with G-rings (retainers) for
postcrior composites
Sunday, October 30,
2016
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37. Matrix
Inserts as a wedge Convex matrix shape creates
natural contact point
Tight cervical marginal adaptation
prevents overhang
Flexible wing exerts pressure for maintained
separation and cervical adaptation
38. • Placed in five seconds
• Jams in and stays in place
• No cervical overhang
• Available in two sizes, Left and Right
• One hand operated organiser box
• Colour coded for easier identification
Matrix
39. • Placed in five seconds
• Jams in and stays in place
• No cervical overhang
• Available in two sizes, Left and Right
• One hand operated organiser box
• Colour coded for easier identification
