Questions and Answers
________ and _______ are other names for a clear plastic strip that is used to provide a temporary wall for the restoration of an anterior tooth.
Celluloid strip, Mylar
Excess restorative material that extends beyond the cavity margin because of improper wedge placement is referred to as _______.
Overhang
_______ is a term that is used when a restoration on a tooth surface is concave and has not been contoured properly.
Cupping
A _______ is placed in the embrasure to provide the contour needed when the interproximal surfaces of a class II, III, or IV restoration is restored.
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A _______ is a band that acts as a temporary wall for a tooth structure in restoring proximal contours and contracting to its normal shape and function.
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A ______ is a small, oval-shaped matrix made of polished stainless steel that can be used for posterior amalgam and composite materials.
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The ______ is a matrix system designed to establish a temporary wall for the restoration of a class II restoration without the need to use it as a retainer.
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The _______ is used to keep a matrix band in place during a class II restoration.
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Which classification would require using a matrix system?
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The plural word for matrix is __________.
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Which would be used to hold a posterior matrix band in position?
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In what direction is the smaller circumference of the posterior matrix band positioned when placed properly?
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Which instrument could be selected to thin and contour a matrix band?
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What additional item is placed for a posterior matrix system to reestablish proper interproximal contact of the newly placed material?
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What could improper wedge placement result in?
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Which matrix system could be an alternative to the universal retainer?
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Why are metal matrix bands contraindicated with the use of composite resin materials?
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Another term(s) for the clear matrix is ______.
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Study Notes
Matrix Systems in Restorative Dentistry
- Celluloid strip and Mylar are terms used for a clear plastic strip that temporarily walls restorations for anterior teeth.
- An overhang is excess restorative material that improperly extends beyond the cavity margin due to incorrect wedge placement.
- Cupping refers to a concave restoration that is not properly contoured on a tooth surface.
- A wedge is used in the embrasure to create the necessary contour for interproximal surfaces in class II, III, or IV restorations.
- A matrix is a band that serves as a temporary wall for tooth structure, helping to restore proximal contours and allowing the tooth to regain its normal function.
- The Palodent is a small, oval-shaped polished stainless steel matrix used for posterior amalgam and composite restorations.
- The Auto Matrix is designed to create a temporary wall for class II restorations without needing a traditional retainer.
- A Universal Retainer holds the matrix band in place during class II restorations.
Matrix System Classifications
- Class B.II is the classification that requires a matrix system.
- The plural of matrix is matrices.
- The Universal Retainer is specifically for securing a posterior matrix band.
Matrix Band Placement and Instrumentation
- The smaller circumference of a posterior matrix band should be positioned gingivally.
- A burnisher can be used to thin and contour a matrix band.
- A wedge is an essential item for posterior matrix systems to reestablish proper interproximal contact after new material is placed.
Consequences of Improper Use
- Improper wedge placement can lead to issues like overfilling, cupping, and overhang.
- The Automatrix system can serve as an alternative to the universal retainer.
- Metal matrix bands are contraindicated with composite resin materials due to the risk of scratching, which can damage the material.
Alternative Terms
- Alternative terms for clear matrix include celluloid and Mylar strip.
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Description
This quiz focuses on key terms and concepts from Chapter 49, which covers matrix systems used in restorative dentistry. You will learn about essential vocabulary related to the temporary walls and materials used in the restoration of anterior teeth. Test your knowledge on terms such as celluloid strips, overhangs, and cupping.
