Matrix Systems for Restorative Dentistry Dr. Hakan ÇOLAK

Ishık University School of Dentistry

Introduction

A matrix system provides and takes the place of the proximal tooth surface that was removed to restore the proximal contours and contact to their normal shape and function.

Classification of Matrices

Ivory Matrix Holder (Retainer) No. 1

Ivory matrix holder No. 1 is most commonly usedmatrix band holder for unilateral class II tooth preparations.

Ivory Matrix Holder (Retainer) No. 1

Diagrammatic representation of Ivory no. I retainer and band

Tofflemire Universal Matrix Band Retainer

It was designed by Dr BF Tofflemire. It is also well known as ‘universal’ matrix because it can be used in all types of tooth preparations of posterior teeth.

In this, the matrix band is fitted onto the retainer and then fitted loosely over the tooth, which then can be tightened in position by means of the screw

Types of Tofflemire Matrix

Based on type of head Straight

i. Head of matrix system is straight

ii. Placed only from buccal side

Contra-angle

i. Head is angulated

ii. Placed either from buccal or lingual side.

Based on type of dentition Standard-use in permanent dentition

Small-used in primary dentition.

Types of bands

Two types of bands are usually used: 1. Flat Bands

2. Precontoured bands.

Types of bands

Flat bands: Available in two thicknesses

0.0020 inches

0.0015 inches

Any of these thickness can be used, it depends upon operators preference.

According to shapes, three shapes of flat bands are available

No. 1 or universal band

No. 2 or (MOD band):

It has two extensions projecting at gingival edge.

Commonly used in molars

No. 3:

Similar to No. 2 band in design but narrower than No. 2

Types of bands

According to shapes, three shapes of flat bands areavailable No. 1 or universal band

No. 2 or (MOD band):

It has two extensions projecting at gingival edge.

Commonly used in molars

No. 3:

Similar to No. 2 band in design but narrower than No. 2

Types of bands

Flat band need to be contoured before placing in retainer.

Contouring of band can be done with the help of: Ovoid burnisher

Spoon excavator (using its convex side)

Types of matrix bands

Types of bands

Precontoured bands:

Retainerless Automatrix System

This matrix system can be adjusted according to tooth shape and size. The bands are available in different sizes, and come in preformed and disposable form

Precontoured Matrix/Palodent Bitine System

This system consists of precontoured matrices made up of soft metal. In this, the wedge is used to separate the teeth and hold the sectional matrix in position.

Matrix and Wedge Combined Systems

These type of matrix systems offers a unique solution by combining a wedge and a matrix in its design, allowing for fast and efficient approximal contacts for Class II restorations. This one-piece wedge and matrix inserts as easy as a wedge and can be placed in only 5 seconds.

No ring required Achieve restorations with natural contact and tight cervical margins

Tight cervical marginal adaptation avoids overhangs

Convex natural contact point

Flexible wing exerts pressure for maintained separation

FenderMate Assortment Kit

FenderMate Assortment Kit

Cervical matrices

Translucent Matrix Systems

Translucent Matrix Systems

Wedges

Wedges

Types of wedges: Wooden wedges Plastic wedges.

Wedges

Wooden wedges: These are most commonly used and preferred as they can be

easily trimmed and can be fitted in gingival embrasure.

Adapt well in the gingival embrasure

Easy to use

Wooden wedges absorb water, thus increase the interproximal retention

Provide stabilization to matrix band

Available in two shapes

1. Triangular

2. Round

Plastic Wedges

Trimming is difficult

Adaptability is difficult in some cases.

Types of Plastic Wedges

Normal wedges: They are similar to the wooden wedges in shape and use.

Wave shaped wedges : Their curved shape helps in easy placement and proper seal of

buccal and lingual embrasures without impinging gingiva.

Wave shaped wedges are available in three different sizes, i.e. small (white), medium (pink) and large (violet) color

Types of Plastic Wedge

Wave shaped wedges

Light transmitting wedges

As the name indicates, these types of wedges transmit 90 to 95 percent of incident light They are a type of plastic wedges

Transparent in nature

Designed for use in cervical area of class II composite resin restoration

Light transmitting wedges

Advantages of light transmitting wedges over other wedges in composite restorations: Help in reducing the polymerization shrinkage because of

light transmission

Better adaptability.

Interdental Wedges with Hemostatic Properties

Made of maple wood from sustainably managed swiss forest

Contain aluminium potassium sulphate Well know agent with astringent (hemostatic) effect of gingiva