Restorative Dentistry Chapter 49 Flashcards
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Questions and Answers

What is AutoMatrix?

  • A type of dental material
  • A dental tool used for cavity preparation
  • A brand of dental floss
  • Matrix system designed to establish a temporary interproximal wall for tooth restoration (correct)

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?

<p>Foundation that binds or holds the dental material and tooth together during the setting process.</p> Signup and view all the answers

What is Mylar?

<p>Brand name for clear plastic strip used to provide a temporary wall for restoration of an anterior tooth.</p> Signup and view all the answers

What is an overhang?

<p>Excess restorative material that extends beyond the cavity margin.</p> Signup and view all the answers

What is a Palodent?

<p>Small, over-shaped matrix made of stainless steel used interproximally during tooth restoration.</p> Signup and view all the answers

What is a universal retainer?

<p>Dental device used to hold a matrix band in place during restoration of a class II cavity.</p> Signup and view all the answers

What is the purpose of a wedge in dentistry?

<p>Wooden or plastic triangular device placed in the embrasure to provide the contour needed when a class II lesion is restored.</p> Signup and view all the answers

What happens when at least one interproximal wall of the tooth has been removed?

<p>The tooth is prepared for a class II, III, or IV restoration.</p> Signup and view all the answers

What are the functions of matrices besides acting as a temporary wall?

<p>To restore interproximal anatomical contours and contact areas of a tooth surface and to create a smooth external surface for the restorative material to be packed against.</p> Signup and view all the answers

What is another name for a universal retainer?

<p>Tofflemire retainer.</p> Signup and view all the answers

Where is a universal retainer positioned?

<p>On the buccal surface of the tooth that is being restored.</p> Signup and view all the answers

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.

<p>contra-angle retainer.</p> Signup and view all the answers

What are the two designs of the matrix band most commonly used?

<p>Universal band and extension band.</p> Signup and view all the answers

What is the definition of circumference?

<p>Perimeter or outside edge.</p> Signup and view all the answers

When the matrix band is designed in such a way that when the ends of the band are brought together, it will form what?

<p>A circle.</p> Signup and view all the answers

One side of the circumference of the circle will be what than the other side?

<p>Smaller.</p> Signup and view all the answers

The gingival edge is always positioned towards the __________.

<p>Gingiva.</p> Signup and view all the answers

The occlusal edge is always positioned on the tooth facing the __________.

<p>Occlusal part of the tooth.</p> Signup and view all the answers

What are the components of a universal retainer?

<p>Spindle, outer guide slots, outer knob, inner knob, and diagonal slot.</p> Signup and view all the answers

What is the function of the spindle in a universal retainer?

<p>Internal screwlike pin that fits into the diagonal slot to hold the ends of the matrix band.</p> Signup and view all the answers

What are the outer guide slots also known as?

<p>Guide channels.</p> Signup and view all the answers

What is the purpose of the outer knob on a universal retainer?

<p>Used to tighten or loosen the spindle.</p> Signup and view all the answers

Flashcards

AutoMatrix

A temporary interproximal wall for tooth restoration, doesn't need a retainer.

Celluloid Strip

A clear plastic strip that acts as a temporary interproximal wall for restoring front teeth.

Cupping

A concave shape on a tooth surface, indicating improper contouring after a restoration.

Matrix

A foundation that holds dental material and the tooth together during the setting process.

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Mylar

A clear plastic strip used for anterior tooth restoration, like a celluloid strip.

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Overhang

Excess restorative material extending beyond the cavity margin.

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Palodent

A small stainless steel over-shaped matrix used interproximally during tooth restoration.

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Universal Retainer

A device that secures a matrix band during class II cavity restorations.

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Wedge

A triangular device placed between teeth to restore contour during a class II restoration.

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Interproximal Wall Removal

Removing the interproximal wall during tooth preparation for class II, III, or IV restorations.

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Matrices

Essential for stabilizing restorative materials during procedures.

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Functions of Matrices

Temporary walls, restoring tooth contours, smoothing surfaces for material packing.

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Posterior Matrix Systems

Most commonly uses a universal retainer and matrix band for class II restorations.

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Tofflemire Retainer

Another name for the universal retainer used in posterior matrix systems.

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Positioning of Universal Retainer

Position the universal retainer on the buccal (cheek) surface of the tooth.

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Contra-Angle Retainer

Designed with a bend to allow placement on the lingual (tongue) surface.

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Matrix Band Designs

Two common designs: universal band and extension band.

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Universal Band

Selected for moderate cavities, intact cusps, and minimal depth in the proximal area.

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Extension Band

Chosen for deeper cavities with lost cusps, requiring gingival extensions.

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Circumference

The outer edge of the matrix band, forming a circle when its ends are joined.

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Smaller vs. Larger Circumference

One edge is smaller, aligning with the gum, while the other edge is larger, facing the chewing surface.

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Universal Retainer Components

Components that make up the universal retainer

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Spindle

A screw-like pin that secures the matrix band by fitting into the diagonal slot.

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Outer Guide Slots

Channels that guide the matrix band loop, dependent on the treatment quadrant.

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Outer Knob

Used to tighten the spindle and properly place the matrix band.

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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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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.

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