6065494matrixbandsytem12345678910000.ppt

dental

1. Matrix Systems for Matrix Systems for
Restorative DentistryRestorative Dentistry
Chapter 49Chapter 49
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

2. Chapter 49Chapter 49
Lesson 49.1Lesson 49.1
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

3. Learning ObjectivesLearning Objectives

Pronounce, define, and spell the Key Terms.Pronounce, define, and spell the Key Terms.

Describe the use of matrix systems in class II, Describe the use of matrix systems in class II,
III, and IV restorations.III, and IV restorations.

Describe the type of matrices used for posterior Describe the type of matrices used for posterior
restorations.restorations.

Describe the purpose and use of a wedge.Describe the purpose and use of a wedge.

Discuss alternative methods of matrix systems Discuss alternative methods of matrix systems
used in restorative dentistry.used in restorative dentistry.

Assemble a universal retainer and matrix band.Assemble a universal retainer and matrix band.
(Cont’d)(Cont’d)
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

4. Learning ObjectivesLearning Objectives
(Cont’d)(Cont’d)

Place and remove a matrix band and wedge Place and remove a matrix band and wedge
for a class II restoration.for a class II restoration.

Place and remove a matrix band and wedge Place and remove a matrix band and wedge
for a class III restoration.for a class III restoration.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

5. IntroductionIntroduction
A matrix system provides a A matrix system provides a
“temporary wall” for the restoration “temporary wall” for the restoration
process in class II, III and IV process in class II, III and IV
preparations. preparations.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

6. Posterior Matrix SystemPosterior Matrix System

Universal retainerUniversal retainer

Also referred to as Tofflemire retainerAlso referred to as Tofflemire retainer

Holds the matrix band in positionHolds the matrix band in position

Positioned most commonly from the buccal Positioned most commonly from the buccal
surface of the tooth being restored surface of the tooth being restored
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

7. Components of Universal RetainerComponents of Universal Retainer
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

8. Matrix BandsMatrix Bands

Thin, flexible stainless steelThin, flexible stainless steel

Common designsCommon designs

Universal Universal

Extension Extension

Guidelines for placementGuidelines for placement

Larger circumference: occlusal edgeLarger circumference: occlusal edge

Smaller circumference: gingival edgeSmaller circumference: gingival edge
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

9. Fig. 49-2 Most commonly used posterior matrix bands.Fig. 49-2 Most commonly used posterior matrix bands.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

10. WedgesWedges

Positioned into the lingual embrasure of a Positioned into the lingual embrasure of a
class II preparation after band placementclass II preparation after band placement

Positions the matrix band firmly against the Positions the matrix band firmly against the
gingival margin of the preparationgingival margin of the preparation

Various sizesVarious sizes

Triangular/round Triangular/round

Wood/plastic Wood/plastic
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

11. Fig. 49-5 Assortment of precontoured wedges.Fig. 49-5 Assortment of precontoured wedges.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

12. Anterior Matrix Systems Anterior Matrix Systems

Plastic matrixPlastic matrix

Also referred to as: Also referred to as:

Celluloid matrix Celluloid matrix

Mylar stripMylar strip

Used in Class III and IV restorationsUsed in Class III and IV restorations
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

13. Fig. 49-7 A clear matrix system. Fig. 49-7 A clear matrix system.
(Courtesy of Premier Dental Products.)(Courtesy of Premier Dental Products.)
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

14. Using an Anterior MatrixUsing an Anterior Matrix

Placed interproximally before the etching and Placed interproximally before the etching and
bonding of a tooth.bonding of a tooth.

After the placement of composite material, a After the placement of composite material, a
matrix is pulled tightly around the tooth to matrix is pulled tightly around the tooth to
help reconstruct its natural contour.help reconstruct its natural contour.

A clear plastic matrix allows curing light to A clear plastic matrix allows curing light to
penetrate the material and complete the penetrate the material and complete the
curing process. curing process.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

15. Automatrix System Automatrix System

The automatrix system is an alternative to a universal The automatrix system is an alternative to a universal
retainer.retainer.

No retainer is used to hold the band in place. No retainer is used to hold the band in place.

Preformed bands available in assorted sizes in both metal Preformed bands available in assorted sizes in both metal
and plastic. and plastic.

Each band has a coil-like auto-lock loop. Each band has a coil-like auto-lock loop.

A tightening wrench is inserted into the coil and turned A tightening wrench is inserted into the coil and turned
clockwise to tighten the band.clockwise to tighten the band.

When the band is to be removed, a tightening wrench is When the band is to be removed, a tightening wrench is
inserted into the coil and turned counterclockwise to loosen inserted into the coil and turned counterclockwise to loosen
the band.the band.

Removing pliers are used to cut the band. Removing pliers are used to cut the band.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

16. Fig. 49-9 Automatrix system. Fig. 49-9 Automatrix system.
(Courtesy of Dentsply Caulk.)(Courtesy of Dentsply Caulk.)
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

17. Sectional Matrices Sectional Matrices
A thin, polished palodent-type band and A thin, polished palodent-type band and
tension ring produce tight anatomic tension ring produce tight anatomic
contact for composite resin materials contact for composite resin materials
in class II restorations.in class II restorations.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

18. Fig. 49-10 Sectional matrices. Fig. 49-10 Sectional matrices.
(Courtesy of Garrison Dental Solutions.)(Courtesy of Garrison Dental Solutions.)
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

19. Matrix Systems for Primary Teeth Matrix Systems for Primary Teeth

T-band T-band

When formed, the top portion of the T allows the When formed, the top portion of the T allows the
straight portion to adjust and fit the circumference straight portion to adjust and fit the circumference
of the primary molar. of the primary molar.

Spot-welded band Spot-welded band

Form-fitted band placed around a prepared tooth; Form-fitted band placed around a prepared tooth;
removed and placed in a smaller form of a welder, removed and placed in a smaller form of a welder,
fusing the metal together to make a custom band.fusing the metal together to make a custom band.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

20. Fig. 49-11 Copper T-band used for primary molars.Fig. 49-11 Copper T-band used for primary molars.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

21. Preparing the T-Band Matrix Preparing the T-Band Matrix

The wings of the T-band are bent to form a U-The wings of the T-band are bent to form a U-
shaped trough. shaped trough.

The free end of the band is slipped loosely The free end of the band is slipped loosely
through the U formation. through the U formation.

The wings are closed, and the free end is The wings are closed, and the free end is
pulled to make a small circle of the band. pulled to make a small circle of the band.

Holding the free end toward the facial Holding the free end toward the facial
surface, place the band on the tooth to be surface, place the band on the tooth to be
prepared. prepared.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

22. Fig. 49-12 Spot welder used for primary molars.Fig. 49-12 Spot welder used for primary molars.
(Courtesy of Unitek, Monrovia, Calif.)(Courtesy of Unitek, Monrovia, Calif.)
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.

23. Preparing a Spot-Welded Matrix Preparing a Spot-Welded Matrix
Band Band

Measure ¾ to 1 inch of stainless-steel matrix Measure ¾ to 1 inch of stainless-steel matrix
material. material.

Fit the matrix band around the prepared tooth. Fit the matrix band around the prepared tooth.

Adapt the band, making sure that the ends of Adapt the band, making sure that the ends of
the matrix material are at the facial surface for the the matrix material are at the facial surface for the
sake of visibility and control.sake of visibility and control.

Using Howe pliers, hold the ends tightly and Using Howe pliers, hold the ends tightly and
remove the band in an occlusal direction. remove the band in an occlusal direction.

Place the band in the spot welder.Place the band in the spot welder.

Spot-weld the matrix at three positions. Spot-weld the matrix at three positions.
Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights
reserved.