Published on March 9, 2014
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 used matrix 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 0.0015 inches 0.0020 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 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 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 convexside)
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
Translucent Matrix Systems
Translucent Matrix Systems
Wedges Types of wedges: Wooden Plastic wedges wedges.
Wedges Wooden wedges: These are most commonlyused 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
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