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Matrix

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matrix bands for orthodontic treatment.

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Matrix

  1. 1. BY JANMEJAY B IV/I
  2. 2. *Matrix is a device used during restorative procedure to hold the plastic restorative material within the tooth while it is setting. *Matricing is the procedure whereby a temporary wall is created opposite to axial walls, surrounding areas of the tooth structure that were lost during the cavity preparation.
  3. 3. *Ease of application *Not be cumbersome *Ease of removal *Rigidity *Provide proper proximal contact and contour *Non reactive *Inexpensive
  4. 4. *To confine the restorative material while it is hardening. *To establish optimal contacts and contour for the restoration. *To prevent gingival overhangs of the restoration. *To provide an acceptable surface texture for the restoration.
  5. 5. * Food impaction/retention * Gingival recession Gingival inflammation * Fractured restoration Drift * Faulty occlusion * Distal migration of untreated tooth * Gingival irritation * Periodontal complication * acute abscess or bone loss. * Shifting of teeth
  6. 6. * THERE ARE TWO PARTS IN A MATRIX: 1.BAND 2.RETAINER
  7. 7. *Piece of metal or polymeric material used to support and give form to the restorative material. *Bands are usually made up of stainless steel, cellulose acetate, cellulose nitrate and polyacetate. *Band size: 0.001-0.002 inch thickness and 3/16th, 1/4th, 5/16th inch width.
  8. 8. *This is a device by which the band can be maintained in its position and shape. *The retainer may be a mechanical device, dental floss, a metal ring or impression compound.
  9. 9. *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
  10. 10. *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.
  11. 11. 3.
  12. 12. *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.
  13. 13. *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.
  14. 14. *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
  15. 15. 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.
  16. 16. * 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.
  17. 17. 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.
  18. 18. 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.
  19. 19. 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.
  20. 20. * 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
  21. 21. 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
  22. 22. 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
  23. 23. 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

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