matrix bands for orthodontic treatment.

1. BY JANMEJAY B
IV/I

2. *Matrix is a device used during
restorative procedure to hold
the plastic restorative material
within the tooth while it is
setting.
*Matricing is the procedure
whereby a temporary wall is
created opposite to axial walls,
surrounding areas of the tooth
structure that were lost during
the cavity preparation.

3. *Ease of application
*Not be cumbersome
*Ease of removal
*Rigidity
*Provide proper proximal contact and contour
*Non reactive
*Inexpensive

4. *To confine the restorative material while it is
hardening.
*To establish optimal contacts and contour for
the restoration.
*To prevent gingival overhangs of the
restoration.
*To provide an acceptable surface texture for
the restoration.

5. * Food impaction/retention
* Gingival recession Gingival inflammation
* Fractured restoration Drift
* Faulty occlusion
* Distal migration of untreated tooth
* Gingival irritation
* Periodontal complication
* acute abscess or bone loss.
* Shifting of teeth

6. * THERE ARE TWO PARTS IN A MATRIX:
1.BAND
2.RETAINER

7. *Piece of metal or polymeric material
used to support and give form to the
restorative material.
*Bands are usually made up of
stainless steel, cellulose acetate,
cellulose nitrate and polyacetate.
*Band size: 0.001-0.002 inch thickness
and 3/16th, 1/4th, 5/16th inch width.

8. *This is a device by which the
band can be maintained in its
position and shape.
*The retainer may be a
mechanical device, dental floss,
a metal ring or impression
compound.

9. *Depending on the type of band material:
1. Stainless steel
2.Copper band
3.Cellulose acetate
4.Polyacetate
*Depending on its preparation:
1.Custom made. e.g. compound supported matrix
2.Mechanical matrix. e.g. ivory no. 1
e.g. ivory no. 8

10. *Depending upon the mode of retention:
1.With retainer. E.G. Tofflemire, ivory
no.1, ivory no.8 matrices.
2.Without retainer. E.G. Automatrix
*Depending on the cavity preparation for
which it is used:
1.Class I cavity with buccal and lingual
extension. Double banded tofflemire.
2.Class II cavity. Single banded tofflemire,
ivory no.1, ivory no.8, copper band matrix,
t band matrix, precontoured sectional
matrix.

11. 3.

12. *Consist of stainless steel band which
encircle one proximal surface of a
posterior tooth.
*This is attached to the retainer via a wedge
shaped projection on the retainer.
*An adjustment screw at the end of the
retainer adapts the band to the proximal
contour of the prepared tooth.
Indication: For restoration of class II cavity
especially when the contact on the
unprepared side is very tight.

13. *Consist of a stainless steel band the
encircles the entire crown of the tooth.
*The circumference of the band can be
adjusted by the adjusting screw present in
the retainer.
Indication: for the restoration of the class II
cavities on one or both proximal surface of
the posterior tooth.

14. *Also referred as The Universal Matrix.
*Designed by B.R. Tofflemire.
*Used mostly for the class II amalgam
restorations.
Parts of the tofflemire matrix:
1.Head
2.Locking vise
3.Pointed spindle
4.Small knurled nut
5.Large knurled nut

15. Indications:
1.For class I cavities with buccal or lingual
extensions ( class I compound)
2.For restoring class II cavities on one or both the
proximal surfaces of posterior tooth.
*Advantages :
1.Ease of use
2.Produces good contact and contour for most
amalgam restorations.
3.Rigid and stable
*Disadvantages:
1.Does not provide optimum contour and contact for
posterior composite restoration.
2.Not useful for extensive class II restoration.

18. * Also called as custom made matrix.
* Entirely hand made as per the individual case.
Indication:
1. for restoring class II cavities involving one or both
proximal surfaces.
2.For complex situations like pin amalgam restoration.
Advantages:
1.Highly rigid and stable.
2.Provide good access and visibility for placing the
restoration.
3.Most efficient means of reproducing contact and
contour.
Disadvantage:
1.Time consuming.

19. Indiacation: for class II cavities involving one or
both the proximal surfaces of the posterior
tooth.
Advantage: simple and inexpensive
Rapid and easy to apply.
Disadvantage: flimsy in structure, not very
stable.

20. Indication: for small to moderate class II cavities
involving one or both proximal surfaces in a posterior
tooth.
For both amalgam and composite restoration.
Advantage: ease of use and good visibility.
Anatomic contour of the bands ensures optimal
contact areas and embrasures.
Contact dimensions are adequate and in the correct
anatomic location.
Disadvantge: expensive.
Matrix bands may become dented easily especially if
the contact area of the adjacent tooth is too close
preventing easy insertion of the band.

21. Indication:
for badly broken down teeth especially those
receiving pin amalgam restoration.
For complex situation like class II cavities with
large buccal or lingual extensions.
Advantage: provide excellent contour.
Disadvantage: time consuming.

22. * Indication: for complex amalgam restoration especially when
one or more cusps are to be replaced.
* Advantages:
Convenient to use
Improved visibility due to lac k of interference from a
retainer.
Rapid application.
* Disadvantage:
Bands are flat and difficult to burnish
Cannot develop proper proximal contacts and contour.
expensive

23. Indication: for small ad large class II and class IV
tooth coloured restoration.
Advantage: easy to use
Inexpensive
Good contour can be established.
Disadvantage:
Placement is time consuming

24. Indication:
For class III restoration on the distal surface of
canine.
For class II slot restoration.
Advantage:
Provides ideal contour for the class III
restoration on the distal surface of the canine.
Disadvantage: difficult to apply

25. Indication:
For class V restoration with conventional glass
ionomer cements.
Advantages:
Simple and easy to use.
Provides optimum contour for the restoration.
Disadavantge: not useful for class V composite
resin or