2. DEFINITION
• Matricing is the procedure whereby a
temporary wall is created opposite to axial
walls, surrounding areas of tooth structure
that were lost during preparation.
»PARTS OF MATRIX
• Band
• Retainer
4. FUNCTION
•To restore anatomic contours and contact areas
Qualities of a good matrix
•Rigidity
•Establishment of proper anatomic contour
•Restoration of correct proximal contact relation
•Prevention of gingival excess
•Convenient application & ease of removal
11. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
Left bottom is a clinical photo
of a Tofflemire retainer. left
top shows a straight Tofflemire
retainer (above) and a contra-
angled tofflemire retainer
(below). The straight retainer
is used most frequently and is
normally placed on the buccal
side of the tooth. The contra-
angle retainer may be use
when the retainer must be
place on the lingual surface of
the tooth. The angle of the
handle allows it to be placed
without the interference of the
anterior teeth.
12. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
TYPES
[1] Straight: placed
buccaly
[2] Contra angled: can
also be placed lingually
13. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
• INDICATION
[1] MOD preparation
filling of posterior
teeth
[2] Also for MO or DO
class II restoration
14. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
• Advantage
[1] The retainer and band
are stable when in
place
[2] Easy seperation of
retainer from band
which makes easy
removal of band
[3]Less time required for
placement
[4]Help to hold the cotton roll
in place
Disadvantages
[1] Proximal surfaces restored using
the tofflemire matrix requir more
carving than those restored with the
compound supported matrix.
[2] Contouring of matrix band is
required.
15. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
• The left bottm drawing shows two
of the common problems which
can occur with the use of a matrix
band. #1 - Shows a matrix band
that is resting above the top of the
gingival margin of the proximal
box instead of being placed at
least 1mm below this margin. This
will cause a submarginal defect at
this cavosurface margin that may
later lead to recurrent decay in
that area. #2 - Shows a matrix
band place without a wedge, and
therefore is poorly adapted to the
interproximal tooth structure. This
allows an overhang of excess
amalgam and may lead to
recurrent caries and periodontal
disease
16. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
• BANDS
• There are various sizes and shapes
of matrix material. The most
common are pictured in the top
left photo. The universal band is
most commonly used. As the photo
in the top right shows, the depth of
the proximal box in a gingival
direction can vary greatly. To
accommodate the deeper boxes, an
MOD band with loop extensions in
the areas of the proximal boxes
may be used. If only one proximal
box is deep, then one of the loops
may be removed with scissors.
17. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
• PARTS
[1] HEAD
[2] SLIDING
BODY(SLOTED
VICE)
[3] ROTATING
SPINDLE(
[4] SET SCREW
18. TOFFLEMIRE MATRIX
( UNIVERSAL MATRIX )
• The most commonly used matrix
system is the Tofflemire
Universal matrix band retainer.
the basic parts of the retainer are
shown in the top right photo.
The head of the retainer has
three slots to allow the matrix
band to exit out of the head to
either side or straight ahead. The
band is held in place by passing
it through the sliding body and
tightening the set screw to lock it
in place. The rotating spindle is
used to tighten the loop of band
material (exiting from the head)
around the tooth.
19. TOFFLEMIRE MATRIX
TECHNIQUE
When the matrix band is folded to make
a loop, one side of the loop will form an
opening with a greater circumference
than the other. The band is designed this
way to allow it to adapt to the narrower
neck of the tooth. The narrowest opening
of the loop should always go toward the
gingval to allow the band to properly
adapt to the tooth. The end of the slots of
the Tofflemire retainer should also
always face the gingiva to allow easy
removal of the retainer. This means that
the loop of matrix band should be placed
into the tofflemire retainer so that the
narrowest end of the loop should always
be near the open end of the slots of the
tofflemire retainer.
20. TOFFLEMIRE MATRIX
TECHNIQUE
The photos above show a
properly engaged matrix
band in the Tofflemire
retainer. Notice in the
photo at the top left that
the narrowest end of the
looped matrix band
material is located on the
same side of the retainer
as the open slots of the
head
21. TOFFLEMIRE MATRIX
TECHNIQUE
The occlusal edge of the
matrix band should extend
1mm. beyond the height of
the adjacent marginal ridge.
If it extends more, then the
excess should be trimmed
away to reduce the overall
height of the band. The band
is normally trimmed at the
gingival margin to allow the
band to adapt to the gingival
contours.
22. TOFFLEMIRE MATRIX
TECHNIQUE
Once the matrix band
is placed into the slots
of the head and the
ends of the band are
located in the sliding
body, the set screw is
turned in a clockwise
direction to tighten
the band in place.
28. MATRICES FOR A CAVITY PREPARATION FOR AMALAGM
RESTORATIONS ON DISTAL ASPECT OF CUSPID
• S-shaped matrix
29. MATRICES FOR CLASS III DIRECT TOOTH
COLOURED RESTORATIONS
• Band strip matrix
30. MATRICES FOR CLASS III DIRECT TOOTH
COLOURED RESTORATIONS
• Matrix for two small
proximal preparation
in contact with each
other
31. MATRICES FOR CLASS IV PREPARATIONS
FOR DIRECT TOOTH COLORED MATERIALS
• Plastic strip for inciso-
proximal cavity
• Transperant crown form
matrices
( stock plastic crowns )
• Aluminium foil incisal
corner matrix
( stock metallic matrices )
32. MATRICES FOR CLASS V PREPARATIONS
FOR DIRECT TOOTH COLOURED MATERIALS
• Anatomic matrix for non-light cured, direct tooth coloured
materials
33. MATRICES FOR CLASS V PREPARATIONS
FOR DIRECT TOOTH COLOURED MATERIALS
• Anatomic matrix for
light and non-light
cured direct tooth-
coloured materials
37. AUTOMATRIX
• It is a retainerless matrix
system with four types of
bands that are designed
to fit all teeth, regardless
of circumference.
• TYPES
(1) Narrow regular
(2) Wide regular
(3) Medium thin
(4) medium regular
38. AUTOMATRIX
• DIMENSION
Height: 4.7 to 7.9 mm
Thickness:
[1] 0.038mm
[2] 0.050mm
• INDICATION
Extensive class II
preparation, especially
those replacing two or
more cusps.
39. AUTOMATRIX
• ADVANTAGES
Auto-lock loop can be
positioned either on the facial
or lingual surfaces with ease.
• DISADVANTAGE
Bands are not pre
contoured and
development of
physiological proximal
contours is difficult
