Matrix systems for Operative Dentistry
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Transcript of Matrix systems for Operative Dentistry
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