Ch. 49 - Matrix Systems for Restorative Dentistry
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Matrix Systems for Matrix Systems for Restorative Restorative Dentistry Dentistry Chapter 49 Chapter 49 Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
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Transcript of Ch. 49 - Matrix Systems for Restorative Dentistry
- 1. Matrix Systems for Restorative Dentistry Chapter 49 Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 2. Chapter 49 Lesson 49.1 Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 3. Learning Objectives
- Pronounce, define, and spell the Key Terms.
- Describe the use of matrix systems in class II, III, and IV restorations.
- Describe the type of matrices used for posterior restorations.
- Describe the purpose and use of a wedge.
- Discuss alternative methods of matrix systems used in restorative dentistry.
- Assemble a universal retainer and matrix band.
- (Contd)
- 4. Learning Objectives
- (Contd)
- Place and remove a matrix band and wedge for a class II restoration.
- Place and remove a matrix band and wedge for a class III restoration.
- 5. Introduction
- A matrix system provides a temporary wall for the restoration process in class II, III and IV preparations.
- 6. Posterior Matrix System
- Universal retainer
- Also referred to as Tofflemire retainer
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- Holds the matrix band in position
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- Positioned most commonly from the buccal surface of the tooth being restored
- 7. Components of Universal Retainer Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 8. Matrix Bands
- Thin, flexible stainless steel
- Common designs
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- Universal
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- Extension
- Guidelines for placement
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- Larger circumference: occlusal edge
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- Smaller circumference: gingival edge
- 9. Fig. 49-2 Most commonly used posterior matrix bands. Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 10. Wedges
- Positioned into the lingual embrasure of a class II preparation after band placement
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- Positions the matrix band firmly against the gingival margin of the preparation
- Various sizes
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- Triangular/round
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- Wood/plastic
- 11. Fig. 49-5 Assortment of precontoured wedges. Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 12. Anterior Matrix Systems
- Plastic matrix
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- Also referred to as:
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- Celluloid matrix
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- Mylar strip
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- Used in Class III and IV restorations
- 13. Fig. 49-7 A clear matrix system. (Courtesy of Premier Dental Products.) Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 14. Using an Anterior Matrix
- Placed interproximally before the etching and bonding of a tooth.
- After the placement of composite material, a matrix is pulled tightly around the tooth to help reconstruct its natural contour.
- A clear plastic matrix allows curing light to penetrate the material and complete the curing process.
- 15. Automatrix System
- The automatrix system is an alternative to a universal retainer.
- No retainer is used to hold the band in place.
- Preformed bands available in assorted sizes in both metal and plastic.
- Each band has a coil-like auto-lock loop.
- A tightening wrench is inserted into the coil and turned clockwise to tighten the band.
- When the band is to be removed, a tightening wrench is inserted into the coil and turned counterclockwise to loosen the band.
- Removing pliers are used to cut the band.
- 16. Fig. 49-9 Automatrix system. (Courtesy of Dentsply Caulk.) Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 17. Sectional Matrices
- A thin, polished palodent-type band and tension ring produce tight anatomic contact for composite resin materials in class II restorations.
- 18. Fig. 49-10 Sectional matrices. (Courtesy of Garrison Dental Solutions.) Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 19. Matrix Systems for Primary Teeth
- T-band
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- When formed, the top portion of the T allows the straight portion to adjust and fit the circumference of the primary molar.
- Spot-welded band
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- Form-fitted band placed around a prepared tooth; removed and placed in a smaller form of a welder, fusing the metal together to make a custom band.
- 20. Fig. 49-11 Copper T-band used for primary molars. Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 21. Preparing the T-Band Matrix
- The wings of the T-band are bent to form a U-shaped trough.
- The free end of the band is slipped loosely through the U formation.
- The wings are closed, and the free end is pulled to make a small circle of the band.
- Holding the free end toward the facial surface, place the band on the tooth to be prepared.
- 22. Fig. 49-12 Spot welder used for primary molars. (Courtesy of Unitek, Monrovia, Calif.) Copyright 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.
- 23. Preparing a Spot-Welded Matrix Band
- Measure to 1 inch of stainless-steel matrix material.
- Fit the matrix band around the prepared tooth.
- Adapt the band, making sure that the ends of the matrix material are at the facial surface for the sake of visibility and control.
- Using Howe pliers, hold the ends tightly and remove the band in an occlusal direction.
- Place the band in the spot welder.
- Spot-weld the matrix at three positions.
