a simple ppt for under graduates

1. PRESENTATION ON
MATRIXING AND WEDGES
BY:
MANJU KIRAN R.
1

2. INTRODUCTION:
MATRIX
Appropriate axial tooth contours.
Confine the restorative material excess.
MATRIXING
Temporary wall.
WEDGES
Device that create rapid separation.
2

3. OBJECTIVE:
The matrix should :
Displace the gingiva and rubber dam
Provide shape for the restoration
 Confine the restorative material within the
cavity
3

4. CONTACTS & CONTOUR
Location of proximal contact area is normally
Maxillary & mandibular anteriors : incisal third
& positioned slightly facial
Maxillary & mandibular posteriors :near the
junction of occlusal and middle third or in the
middle third
4

5. BENEFITS OF AN IDEAL CONTACT AND
CONTOUR
Health of periodontium
Prevents food impaction
Self cleansable
Longevity of proximal restoration
Normal mesio distal relationship
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6. CLASSIFICATION:
1.Based on mode of retention:
a) With retainer
b) Without retainer
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7. 2.Based on type of band
a) Metallic non transparent b) Non metallic transparent
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8. 3. Based on type of cavity for which it is used
a) Matrix for Class I cavity preparation
Ex: Double banded tofflemire
b) Matrix for Class II cavity preparation
Ex: Single banded tofflemire
Ivory No. 1
Ivory No. 8
Copper band
Anatomical Matrix
Automatrix
8

9. c)Matrix for Class III cavity preparation
Ex: Mylar strip matrix
S- shaped matrix
d)Matrix for Class IV cavity preparation
Ex: Custom lingual matrix
Modified S- shaped matrix
e)Matrix for Class V cavity preparation
Ex: Window matrix
Cervical matrix
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10. 4. Based on its preparation
1. Custom made or anatomic
Ex: compound supported matrix
2. Mechanical matrix
Ex: tofflemire, ivory no.1 & 8 matrices
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11. IVORY NO.1 MATRIX
 An adjustable metal retainer,
holds bands of stainless steel that
provide the missing wall for the
single proximal surface
restoration (MO or DO).
 In middle of band one
margin is slightly projected, which
is kept toward the gingiva on the
cavity side.
 Free end of matrix band are
kept on the non cavity side.
11

12. IVORY NO.8 MATRIX
 Consists of a band that
encircles the entire
crown
 To restore class II
cavities on one or both
proximal surfaces of
posterior tooth
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13. UNIVERSAL MATRIX (Tofflemire Matrix)
13

14. INDICATIONS:
 Class I cavity with buccal/lingual extension
 b) Class II cavities
ADVANTAGES:
 Ease of use.
 Good contact & contour
 Rigid & stable
DISADVANTAGES:
 Does not produce optimum contact &
contour for posterior composite
 Not useful for extensive class II
14

15. COMPOUND SUPPORTED MATRIX
INDICATIONS
 Class II cavities
 Pin amalgam restoration
ADVANTAGES
 Rigid & stable
 Access & visibility
 Most efficient
DISADVANTAGE
 Time consuming
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16. T BAND MATRIX
INDICATIONS
 Class II cavities
ADVANTAGES
 Simple , inexpensive
 Rapid and easy
DISADVANTAGES
 Flimsy in structure, not
stable
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17. COPPER BAND MATRIX
INDICATIONS
 Badly broken teeth, that
receiving pin amalgam
restorations
 class II with large buccal
or lingual extensions
ADVANTAGES
 Excellent contour
DISADVANTAGES
 Time consuming
17

18. S SHAPED MATRIX
INDICATIONS
Class III restorations on canine
Class II slot restorations
ADVANTAGES
Ideal contour on distal surface
DISADVANTAGES
Difficulty to apply
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19. CERVICAL MATRICES
INDICATIONS
 Class V restorations
ADVANTAGES
 Good contour
DISADVANTAGES
 Expensive
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20. SECTIONAL MATRIX
Sectional matrix system that
delivers easy, predictable
and accurate contact
creation by utilizing
advanced ring, matrix and
wedge technology. It
offers accurate contacts
and tight marginal seal,
minimized overhang and
finishing, easy placement
and removal.
Ex: palodent ,garrison ,
dentsply
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21. MYLAR STRIP MATRIX
INDICATIONS:
 For Class III & Class IV
tooth colored restorations
ADVANTAGES:
 Ease of use.
 Inexpensive.
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22. APPLICATION:
Shaping the matrix.
Preparing the retainer to receive the band.
Placing the band with retainer on the
prepared tooth.
Removal of the band with the retainer.
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23. WEDGES
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24. Wedges are small, tapering, triangular
pieces of, wood or clear plastic about
½ inch in length 24

25. WEDGE PLACEMENT
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26. WEDGE PRINCIPLE
Mechanical method of tooth separation
where a wedge or conical shaped device is
inserted between adjacent teeth beneath
the contact area of teeth which leads to
separation.
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27. 27
wedges
wooden plastic
Triangular
round
Light transmitting

28. SIZE & SHAPE
SIZE:- ½ inches(1.2cm)
Wedges are available in
various sizes, which may be
color coded. They are
either plain (straight) or
anatomically
(triangular)shaped
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29. 29

30. MODE OF INSERTION
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31. POSITION & PLACEMENT
 As near to the gingival cavosurface margin as
possible
Not only stabilizing the matrix but more
importantly it is placed below gingival
cavosurface margin to prevent amalgam from
flowing below the cavo surface margin.
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32. CORRECT & INCORRECT WEDGE
POSITION
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33. WEDGING TCHNIQUES
1. Single wedge technique
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34. 2. PIGGY BACK WEDGING
 Useful for the patients
with gingival recession
 Wedge is significantly
apical of the gingival
margin a second wedge
may be placed on top of
the first
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35. 3.DOUBLE WEDGING
 One from lingual
embrasure and one
from facial embrasure
 Only if middle 2/3 of
proximal margin can be
adequately wedged.
 When proximal box is
wide facio lingually
35

36. 4.WEDGE WEDGING
 Mostly employed on
mesial aspect of
maxillary I premolar,
because of fluted
roots(concavity)
 Second pointed wedge
is inserted between the
first wedge and the
band, to wedge a matrix
band tightly in such a
margin
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37. 5.TRIANGULAR VS ROUND WEDGE
 Round: is a wedge of
choice in conservative
class II ,however its
wedging action is more
occlusal
 Triangular:
1. preparation with deep
gingival margin
2.with tofflemire MOD
matrix band
3.deep gingival margin
37

38. 6.MODIFIED TRIANGULAR WEDGE
(anatomic wedge)
Modified to conform to the approximating
tooth contours
Prevents distortion of matrix contour
Preferred for deeply extended gingival
margins
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39. REFERENCES
Operative dentistry : STURDEVANT’S
Operative dentistry : JAMES B. SUMMITT
Operative dentistry : M.A. MARZOUK
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