Questions and Answers
What is AutoMatrix?
What is a celluloid strip used for?
To provide a temporary interproximal wall for the restoration of an anterior tooth.
What is cupping in dentistry?
Form created by a concave tooth surface that has not been contoured properly.
What is the definition of a matrix?
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What is Mylar?
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What is an overhang?
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What is a Palodent?
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What is a universal retainer?
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What is the purpose of a wedge in dentistry?
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What happens when at least one interproximal wall of the tooth has been removed?
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What are the functions of matrices besides acting as a temporary wall?
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What is another name for a universal retainer?
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Where is a universal retainer positioned?
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If during tooth preparation, the interproximal wall extends onto the buccal surface, a __________ has been designed with a slight bend in the body to accommodate positioning from the lingual surface.
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What are the two designs of the matrix band most commonly used?
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What is the definition of circumference?
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When the matrix band is designed in such a way that when the ends of the band are brought together, it will form what?
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One side of the circumference of the circle will be what than the other side?
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The gingival edge is always positioned towards the __________.
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The occlusal edge is always positioned on the tooth facing the __________.
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What are the components of a universal retainer?
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What is the function of the spindle in a universal retainer?
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What are the outer guide slots also known as?
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What is the purpose of the outer knob on a universal retainer?
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Study Notes
Matrix Systems in Restorative Dentistry
- AutoMatrix: A matrix system that provides a temporary interproximal wall for tooth restoration without needing a retainer.
- Celluloid Strip: A clear plastic strip serving as a temporary interproximal wall for restoring anterior teeth.
- Cupping: A concave tooth surface formation that indicates improper contouring.
- Matrix: Acts as a foundation that holds dental material and the tooth together during the setting process.
- Mylar: A brand of clear plastic strip used similarly to celluloid strips for anterior tooth restoration.
- Overhang: Occurs when excess restorative material extends beyond the cavity margin.
- Palodent: A small stainless steel over-shaped matrix used interproximally during tooth restoration.
- Universal Retainer: A device that secures a matrix band during class II cavity restorations.
Additional Concepts and Components
- Wedge: A triangular wooden or plastic device placed in the embrasure to restore contour during a class II lesion.
- Interproximal Wall Removal: Occurs when preparing a tooth for class II, III, or IV restorations.
- Matrices (Plural of Matrix): Essential for restorative procedures to stabilize materials.
- Functions of Matrices: Besides acting as a temporary wall, they help restore anatomical contours and smooth external surfaces for material packing.
Specific Types and Components
- Posterior Matrix Systems: Most commonly employs the universal retainer and matrix band for class II restorations; preparation efficiency is improved by having these ready at the procedure's start.
- Tofflemire Retainer: Another name for the universal retainer.
- Positioning of Universal Retainer: Positioned on the buccal surface of the tooth being restored.
- Contra-Angle Retainer: Designed with a bend to enable positioning from the lingual surface when interproximal walls extend onto the buccal surface.
- Matrix Band Designs: Two designs include the universal band and extension band.
Selection of Matrix Bands
- Universal Band: Chosen for class II preparations with intact cusps and minimum depth/width in the proximal "box."
- Extension Band: Selected for deeper class II preparations needing gingival extensions to compensate for lost cusps, as a universal band may not suffice in height.
Matrix Band Structure
- Circumference: Refers to the perimeter or outer edge of the matrix band.
- Forming a Circle: The band is designed to form a circle when its ends are joined.
- Smaller vs. Larger Circumference: One edge is smaller, aligning with the gingival area, while the larger edge faces the occlusal surface.
Universal Retainer Components
- Retainer Elements: Includes spindle, outer guide slots, outer knob, inner knob, and diagonal slot.
- Spindle: A screw-like pin that secures the matrix band by fitting into the diagonal slot; assembly requires ensuring the spindle point is clear before band placement.
- Outer Guide Slots: Channels that guide the matrix band loop, determined by the treatment quadrant.
- Outer Knob: Used to adjust the spindle's tightness, facilitating the proper placement of the matrix band.
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Description
Explore the key terms and concepts from Chapter 49 of Matrix Systems for Restorative Dentistry through these flashcards. This quiz includes definitions for essential terms like AutoMatrix and Celluloid strip, helping you grasp crucial restorative techniques. Perfect for dental students and professionals looking to enhance their knowledge.