Types Of Matrix Retainer&

Parts Of Retainer

By: Syed Usama Shayan

CONTENTS

Types Of Matrix Retainer On Basis Of:• 1. Materials

• 2. Prepartion

• 3. Retention

• 4. Cavity Type

• Parts Of Retainer

Types Of Matrix RetainerTypes Of Matrix Retainer• *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

• *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. 3. For other Types Cavity prepartion. Auto matrix, Clear

plastic matrix

• *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.

Ivory matrix no. Ivory matrix no. 11

Ivory matrix no. 1Ivory matrix no. 1Retainer & BandsRetainer & Bands

Ivory No. 8 matrix Ivory No. 8 matrix

• *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.

Ivory matrix No. 8 Ivory matrix No. 8

Tofflemire MatrixTofflemire Matrix

• *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

Tofflemire MatrixTofflemire Matrix• 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.1

Compound MatixCompound Matix• * 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.

T Band MatrixT Band Matrix

• 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.

Precontoured Sectionsl Precontoured Sectionsl Matrices & Contact RingsMatrices & Contact Rings

• 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.

Copper Band MatricesCopper Band Matrices

• 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.

AutomatrixAutomatrix

• * 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

Clear Plastic MatixClear Plastic Matix

• 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

S Shaped BandS Shaped Band

• 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

Tin Foil Matrix

• 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

•PARTS OF PARTS OF TOFFLEMIRE TOFFLEMIRE RETAINERRETAINER

PARTS OF TOFFLEMIRE REATAINER

• Parts Parts : • • HEAD : This accommodates the matrix band. It is U-

shaped with 2 slots.• The open side of the head should be held facing

upwards when the band is inserted and while positioning the band around the tooth the slots in the head should be directed gingivally.

• The head may be straight or angulated with respect to the rest of the retainer.

• Accordingly there are 2 types of tofflemire retainers:

• – Straight tofflemire retainer: here the head is straight. This can be positioned only from the buccal side.

• – Contra-angled tofflemire retainer: Here the head is angled and this can be placed either from buccal or lingual side.

• • • LOCKING VISELOCKING VISE: This has a diagonal slot. It is positioned near the head for placing the band in the retainer and positioning it around the tooth.

• • • POINTED SPINDLEPOINTED SPINDLE: This is used to adjust the distance between the head and the locking vise and also to adjust the size of the loop of the matrix band.

• • • SMALL KNURLED NUT: SMALL KNURLED NUT: Turning this nut clockwise tightens the pointed spindle against the band and thus secures the band in the retainer. The reverse motion releases the pointed spindle from the locking vise thus releasing the band from the retainer.

• LARGE KNURLED NUT:LARGE KNURLED NUT: This is used to adjust the size of the loop of the matrix band either to adapt it tightly against the tooth or to loosen it from the tooth.• Tofflemire retainers are available in 2 sizes :

• – Standard –for use in the adult dentition • – Small - for use in the primary dentition

PARTS

Refrences

• Art and Science

• Operative Dentistry: Sturdevant

• Text book of operative dentistry: Ramyaraghu

• Text book of operative dentistry: vimal.k.sikri