dental matrices types

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Copyright 2003, Elsevier Science (USA). All rights reserved.

Matrix Systems for

Restorative Dentistry

Matrix Systems for

Restorative Dentistry

Chapter 49Chapter 49

Copyright 2003, Elsevier Science (USA).

All rights reserved. No part of this product may be reproduced or transmitted in any

form or by any means, electronic or mechanical, including input into or storage in any

information system, without permission in writing from the publisher.

PowerPoint presentation slides may be displayed and may be reproduced in print

form for instructional purposes only, provided a proper copyright notice appears on

the last page of each print-out.

Produced in the United States of America

ISBN 0-7216-9770-4


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IntroductionIntroduction

A provides and takes the placeof the proximal tooth surface that was removedto restore the proximal contours and contact totheir normal shape and function.

A provides and takes the placeof the proximal tooth surface that was removedto restore the proximal contours and contact totheir normal shape and function.


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Posterior Matrix SystemPosterior Matrix System

Also referred to as the Tofflemire retainer.This device holds the matrix band in

position. The retainer is positioned mostcommonly from the buccal surface of thetooth being restored.

Also referred to as the Tofflemire retainer.This device holds the matrix band in

position. The retainer is positioned mostcommonly from the buccal surface of thetooth being restored.


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Components of a Universal RetainerComponents of a Universal Retainer


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Posterior Matrix System contdPosterior Matrix System contd

Matrix bands are made of flexible stainlesssteel and are available in premolar, molar,and universal sizes and thicknesses.

The largercircumference of the band isthe occlusal edgeand is always placedtoward the occlusal surface.

The smallercircumference of the band isthe gingival edgeand it is always placedtoward the gingiva.

Matrix bands are made of flexible stainlesssteel and are available in premolar, molar,and universal sizes and thicknesses.

The larg

ercircumference of the band isthe occlusal edgeand is always placedtoward the occlusal surface.

The smallercircumference of the band isthe gingival edgeand it is always placedtoward the gingiva.


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Fig. 49-2 Types of matrix bands.Fig. 49-2 Types of matrix bands.


7/19Copyright 2003, Elsevier Science (USA). All rights reserved.

WedgesWedges

A is either triangular or round andmade of wood or plastic.

The wedge is inserted into the lingual

embrasure to position the matrix band firmlyagainst the gingival margin of thepreparation.

A is either triangular or round andmade of wood or plastic.

The wedge is inserted into the lingualembrasure to position the matrix band firmlyagainst the gingival margin of thepreparation.



Fig. 49-6 A wedge correctly positioned.Fig. 49-6 A wedge correctly positioned.



Automatrix SystemAutomatrix System

The automatrix system is an alternative to a universalretainer.

There is no retainer used to hold the band in place.

Bands are already formed into a circle and areavailable in assorted sizes in both metal and plastic.

Each band has a coil like autolock loop.

A tightening wrench is inserted into the coil andturned clockwise to tighten the band.

When finished, the tightening wrench is inserted intothe coil and turned counterclockwise to loosen theband.

Removing pliers are used to cut the band.

The automatrix system is an alternative to a universalretainer.

There is no retainer used to hold the band in place.

Bands are already formed into a circle and areavailable in assorted sizes in both metal and plastic.

Each band has a coil like autolock loop.

A tightening wrench is inserted into the coil andturned clockwise to tighten the band.

When finished, the tightening wrench is inserted into

the coil and turned counterclockwise to loosen theband.

Removing pliers are used to cut the band.



Matrix Systems for Primary TeethMatrix Systems for Primary Teeth

The is a T-shaped copper band. When formed, the top portion of the T allows

the straight portion to adjust and fit thecircumference of the primary molar.

The is a T-shaped copper band. When formed, the top portion of the T allows

the straight portion to adjust and fit thecircumference of the primary molar.



Fig. 49-7 Example of copper T-band used for primary molars.Fig. 49-7 Example of copper T-band used for primary molars.



Preparing the -Band MatrixPreparing the -Band Matrix

The wings of the T-band are bent to form aU-shaped trough.

The free end of the band is slipped looselythrough the U formation.

The wings are closed, and the free end ispulled to make a small circle of the band.

Holding the free end toward the facialsurface, place the band on the tooth to beprepared.

The wings of the T-band are bent to form aU-shaped trough.

The free end of the band is slipped looselythrough the U formation.

The wings are closed, and the free end ispulled to make a small circle of the band.

Holding the free end toward the facialsurface, place the band on the tooth to beprepared.



A is a form-fitted bandplaced around a prepared tooth, thenremoved and placed in a smaller form of awelder that fuses the metal together to make

a custom band.

A is a form-fitted bandplaced around a prepared tooth, thenremoved and placed in a smaller form of awelder that fuses the metal together to make

a custom band.

Additional Matrix Systems for PrimaryTeeth

Additional Matrix Systems for PrimaryTeeth



Fig. 49-8 Spot-welded band.Fig. 49-8 Spot-welded band.


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Preparing a Spot-Welded Matrix BandPreparing a Spot-Welded Matrix Band

Measure to 1 inch of stainless steel matrixmaterial.

Fit the matrix materials around the preparedtooth.

Adapt the band, making sure the ends of thematrix material is at the facial surface forvisibility and control.

Holding the ends tightly, remove the band in anocclusal direction.

Place the band in the spot welder.

Spot-weld the matrix at three positions.

Measure to 1 inch of stainless steel matrixmaterial.

Fit the matrix materials around the preparedtooth.

Adapt the band, making sure the ends of thematrix material is at the facial surface forvisibility and control.

Holding the ends tightly, remove the band in anocclusal direction.

Place the band in the spot welder.

Spot-weld the matrix at three positions.


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Matrices for Composite RestorationsMatrices for Composite Restorations

A plastic matrix, also referred to as aor , is used for

class III and IV restorations in which theproximal wall of an anterior tooth is missing.

A plastic matrix, also referred to as aor , is used for

class III and IV restorations in which theproximal wall of an anterior tooth is missing.


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The Use of a Clear MatrixThe Use of a Clear Matrix

The matrix is placed interproximally beforethe etching and priming of a tooth. Thisprotects adjacent teeth from these materials.

After placement of composite material, amatrix is pulled tightly around the tooth tohelp reconstruct its natural contour.

The clear plastic matrix allows the curing light

to penetrate the material and complete thecuring process.

The matrix is placed interproximally beforethe etching and priming of a tooth. Thisprotects adjacent teeth from these materials.

After placement of composite material, amatrix is pulled tightly around the tooth tohelp reconstruct its natural contour.

The clear plastic matrix allows the curing light

to penetrate the material and complete thecuring process.


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Sectional MatricesSectional Matrices

A thin polished -type band and atension ring produce a tight anatomic contactfor composite resin materials for class IIrestorations.

A thin polished -type band and atension ring produce a tight anatomic contactfor composite resin materials for class IIrestorations.

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