Matrixing and wedges
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Transcript of 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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