Matrixing and wedges

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PRESENTATION ONMATRIXING AND WEDGES

BY:MANJU KIRAN R.

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INTRODUCTION:MATRIXAppropriate axial tooth contours. Confine the restorative material excess. MATRIXINGTemporary wall.WEDGESDevice that create rapid separation.

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OBJECTIVE:The matrix should :Displace the gingiva and rubber damProvide shape for the restoration Confine the restorative material within the

cavity

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CONTACTS & CONTOUR

Location of proximal contact area is normallyMaxillary & mandibular anteriors : incisal third

& positioned slightly facialMaxillary & mandibular posteriors :near the

junction of occlusal and middle third or in the middle third

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BENEFITS OF AN IDEAL CONTACT AND CONTOUR

Health of periodontiumPrevents food impactionSelf cleansableLongevity of proximal restorationNormal mesio distal relationship

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CLASSIFICATION:1.Based on mode of retention:

a) With retainer

b) Without retainer

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2.Based on type of band

a) Metallic non transparent b) Non metallic transparent

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3. Based on type of cavity for which it is useda) Matrix for Class I cavity preparationEx: Double banded tofflemireb) Matrix for Class II cavity preparationEx: Single banded tofflemire

Ivory No. 1 Ivory No. 8 Copper band

Anatomical Matrix Automatrix

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c)Matrix for Class III cavity preparation

Ex: Mylar strip matrix S- shaped matrix

d)Matrix for Class IV cavity preparationEx: Custom lingual matrix Modified S- shaped matrixe)Matrix for Class V cavity preparationEx: Window matrix Cervical matrix

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4. Based on its preparation

1. Custom made or anatomic Ex: compound supported matrix 2. Mechanical matrixEx: tofflemire, ivory no.1 & 8 matrices

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IVORY NO.1 MATRIXAn 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 onemargin is slightly projected, whichis kept toward the gingiva on the cavity side.

Free end of matrix band arekept on the non cavity side.

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IVORY NO.8 MATRIXConsists 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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UNIVERSAL MATRIX (Tofflemire Matrix)

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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

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COMPOUND SUPPORTED MATRIXINDICATIONSClass II cavitiesPin amalgam restoration

ADVANTAGESRigid & stableAccess & visibilityMost efficient

DISADVANTAGETime consuming

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T BAND MATRIXINDICATIONS Class II cavities

ADVANTAGES Simple , inexpensive Rapid and easy

DISADVANTAGES Flimsy in structure, not

stable

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COPPER BAND MATRIX

INDICATIONS Badly broken teeth, that

receiving pin amalgam restorations

class II with large buccal or lingual extensions

ADVANTAGES Excellent contourDISADVANTAGES Time consuming

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S SHAPED MATRIX

INDICATIONSClass III restorations on canineClass II slot restorationsADVANTAGESIdeal contour on distal surfaceDISADVANTAGESDifficulty to apply

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CERVICAL MATRICES

INDICATIONSClass V restorationsADVANTAGESGood contour DISADVANTAGESExpensive

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SECTIONAL MATRIXSectional 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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MYLAR STRIP MATRIX

INDICATIONS: For Class III & Class IV

tooth colored restorations

ADVANTAGES: Ease of use. Inexpensive.

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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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WEDGES

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Wedges are small, tapering, triangular pieces of, wood or clear plastic about ½ inch in length

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WEDGE PLACEMENT

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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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wedges

wooden plastic

Triangularround

Light transmitting

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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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MODE OF INSERTION

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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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CORRECT & INCORRECT WEDGE POSITION

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WEDGING TCHNIQUES

1. Single wedge technique

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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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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

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4.WEDGE WEDGINGMostly 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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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

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6.MODIFIED TRIANGULAR WEDGE (anatomic wedge)

Modified to conform to the approximating tooth contours

Prevents distortion of matrix contourPreferred for deeply extended gingival

margins

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REFERENCES

Operative dentistry : STURDEVANT’SOperative dentistry : JAMES B. SUMMITTOperative dentistry : M.A. MARZOUK

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