Types Of Matrix Retainer
Parts Of Retainer
By: Syed Usama
Types Of Matrix Retainer On Basis
• 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
• *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
• *Consist of stainless steel band which
encircle one proximal surface of a
• *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.
Ivory No. 8 matrixIvory 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
• Indication: for the restoration of the class II
cavities on one or both proximal surface of
the posterior tooth.
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:
• 2.Locking vise
• 3.Pointed spindle
• 4.Small knurled nut
• 5.Large knurled nut
Tofflemire MatrixTofflemire Matrix
• 1.For class I cavities with buccal or lingual extensions ( class I
• 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
• 3.Rigid and stable
• 1.Does not provide optimum contour and contact for posterior
• 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.
• 1. for restoring class II cavities involving one or both
• 2.For complex situations like pin amalgam restoration.
• 1.Highly rigid and stable.
• 2.Provide good access and visibility for placing the
• 3.Most efficient means of reproducing contact and
• Disadvantage: 1.Time consuming.
T Band MatrixT Band Matrix
• Indiacation: for class II cavities involving
one or both the proximal surfaces of the
• Advantage: simple and inexpensive Rapid
and easy to apply.
• Disadvantage: flimsy in structure, not very
Precontoured SectionslPrecontoured 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
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
• Advantage: provide excellent contour.
Disadvantage: time consuming.
• * 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
• 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
S Shaped BandS Shaped Band
• Indication: For class III restoration on the
distal surface of canine. For class II slot
• Advantage: Provides ideal contour for the
class III restoration on the distal surface of
• 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
• Disadavantge: not useful for class V
composite resin or
• PARTS OFPARTS OF
• PartsParts :
• • 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
• – Straight tofflemire retainer: here the head is
straight. This can be positioned only from the
• – 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