Class II Cavity Design Flashcards
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Questions and Answers

What is a Class II restoration?

  • Involves the proximal surface of a posterior tooth
  • Smooth surface caries
  • Compound restoration
  • All of the above (correct)

Where does a Class II originate?

below the contact point

Lesions that radiographically appear to be ______ or more through enamel have actually penetrated DEJ

2/3

What is CariVu?

<p>Camera with a light that illuminates caries on a tooth</p> Signup and view all the answers

What is another tool you can use to diagnose Class II lesions?

<p>Intraoral photos</p> Signup and view all the answers

What is the cavosurface margin?

<p>Junction of the prepared/unprepared portion of the tooth</p> Signup and view all the answers

What is isthmus in dental cavity preparation?

<p>The narrowed area of the prep between the facial and the lingual cusps which connect the fossae</p> Signup and view all the answers

What does the dovetail do in cavity preparation?

<p>Area that parallels the marginal ridge, 'locks' the restoration into the prep</p> Signup and view all the answers

Which is more important to restoration longevity?

<p>Amount of remaining tooth structure (A)</p> Signup and view all the answers

What results from a poor cavosurface margin?

<p>Poor prognosis</p> Signup and view all the answers

Remove all _________ and provide _______ protection

<p>defects, pulpal</p> Signup and view all the answers

What drives the form of prep to ensure that tooth or restoration will not be fractured or displaced during mastication?

<p>Material</p> Signup and view all the answers

You should remove all demineralized enamel and dentin.

<p>True (A)</p> Signup and view all the answers

You should remove enamel not supported by sound dentin.

<p>True (A)</p> Signup and view all the answers

What are the initial steps of tooth prep?

<p>Outline form, resistance form, retention form, convenience form</p> Signup and view all the answers

What is meant by outline form in cavity preparation?

<p>Shape of prep</p> Signup and view all the answers

What does resistance form ensure?

<p>Factors that prevent fracture of the tooth and restoration</p> Signup and view all the answers

What does retention form prevent?

<p>Factors that prevent displacement of the restoration</p> Signup and view all the answers

What is convenience form in cavity prep?

<p>Factors that affect accessibility and ease of placement of restoration</p> Signup and view all the answers

What are the final steps of tooth prep?

<p>Removal of remaining caries in dentin, pulpal protection, secondary resistance &amp; retention features, finish enamel walls, cleanse cavity prep</p> Signup and view all the answers

What is the composite design dictated by?

<p>Caries extension, while still following principles of cavity prep</p> Signup and view all the answers

What principles should be considered before beginning the cavity prep?

<p>Visualize the location of the box relative to the contact, rotated teeth, misaligned teeth, location of occlusal and proximal contacts</p> Signup and view all the answers

What should the angled walls in cavity preparation allow for?

<p>Support for enamel and restorative material</p> Signup and view all the answers

What is secondary retention form?

<p>Retention grooves in buccal and lingual proximal walls at axiobuccal and axiolingual line angles</p> Signup and view all the answers

What is the ideal contact location for restorations?

<p>Buccal-Lingual (A), Occlusal-Gingival (B)</p> Signup and view all the answers

What are the objectives of matrix and wedge placement?

<p>Re-establish the proximal contact, restrict extrusion of the restorative material, provide adequate proximal surfaces</p> Signup and view all the answers

Is the mylar strip acceptable for posterior restorations?

<p>False (B)</p> Signup and view all the answers

What is a universal matrix used for?

<p>No adjacent tooth to form proximal contact, prep extends beyond proximal line angles, large prep, amalgam</p> Signup and view all the answers

Should the matrix band extend 1-2 mm coronal to the adjacent tooth?

<p>True (A)</p> Signup and view all the answers

Which end of the matrix band is toward the occlusal?

<p>Wide end of pinched band</p> Signup and view all the answers

What does burnishing the matrix band do?

<p>Burnish matrix band at level of contact so it will be closely adapted to adjacent tooth</p> Signup and view all the answers

What does proper wedge adaptation ensure?

<p>Gingival floor sealed</p> Signup and view all the answers

What does the FlexiWedge do?

<p>Should be grasped on the inferior and superior aspect of the handle with strong cotton pliers or hemostat</p> Signup and view all the answers

Which teeth and surfaces may have a mesial or distal concavity?

<p>Maxillary 1st premolar (mesial), maxillary 1st molars (distal)</p> Signup and view all the answers

What is the purpose of the Barton Matrix?

<p>Tofflemire retainer with universal matrix + another matrix</p> Signup and view all the answers

What are common challenges of Class II restorations?

<p>Back to back cavities, deep sub-g preps, large preps extending beyond line angles, sensitivity</p> Signup and view all the answers

What are common errors resulting in weak or missing contact?

<p>Inadequately contoured matrix, inadequate wedge, matrix band movement</p> Signup and view all the answers

What are suggested solutions for common errors in Class II restorations?

<p>Properly contour matrix band, check band for contact, use the appropriate matrix system</p> Signup and view all the answers

Flashcards

Class II Restoration

A type of dental restoration that focuses on the proximal (side) surfaces of posterior (back) teeth, addressing cavities that impact both the smooth surface and the chewing surface.

Cavosurface Margin

The point where the prepared and unprepared tooth surfaces meet in a cavity preparation.

Isthmus

The narrow region that connects the facial (front) and lingual (tongue) cusps within a Class II cavity preparation.

Radiographic Evidence of Class II Lesions

Radiographic evidence that indicates a cavity has reached two-thirds of the enamel thickness before reaching the junction between the enamel and dentin.

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CariVu

A diagnostic tool that uses illuminated imaging to detect tooth decay.

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Structural Integrity in Restorations

The underlying principle that emphasizes the importance of preserving as much original tooth structure as possible for lasting restoration.

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Initial Steps in Cavity Prep

The initial steps in cavity preparation that focus on defining the overall shape, ensuring resistance to further damage, preventing displacement of the material, and making the filling process easier.

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Outline Form

The shape and form of the prepared cavity that determines the overall configuration of the restoration.

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Resistance Form

The elements that prevent tooth and restoration fractures during chewing forces.

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Retention Form

The design features that prevent the restorative material from dislodging or shifting during biting or chewing.

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Convenience Form

Steps that make the filling procedure easier and more efficient, such as ensuring adequate access and visibility.

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Final Steps in Cavity Prep

The final steps in cavity preparation that involve removing any remaining decay, protecting the tooth's pulp, and thoroughly cleaning the cavity before placing the restorative material.

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Composite Restoration Design

The principles that dictate the design of composite restorations, taking into account the extent of the cavity and the preparation guidelines.

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Resistance Form in Composite Restoration

The angular orientations and strategic shaping of the prepared cavity that provide strength and resistance to biting forces.

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Retention Form in Composite Restoration

The key elements that hold the restorative material in place, preventing displacement during chewing.

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Matrix Systems

The mechanical system that restores the proximal contacts and prevents the composite material from overflowing during filling.

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Wedges

Wedge-shaped devices used in conjunction with matrices to ensure proper adaptation of the composite material and create tight gingival seals.

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Universal Matrices

A type of matrix that can be used in a variety of cavity preparations, particularly in cases where there is no adjacent tooth or the cavity is large.

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Specific Bands

Specifically designed matrices that cater to the unique shape or position of a cavity, ensuring proper fit without compromising contact with adjacent teeth.

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Challenges in Class II Restorations

The challenges that occur when restoring teeth that have fillings on both sides (back-to-back) or when the cavity extends under the gum line.

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Solutions for Improved Outcomes in Class II

Ensuring the matrix is properly molded and positioned before placing the restorative material to avoid post-treatment issues.

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Proper Technique and Material Use in Class II

The application of specific tools and techniques, such as proper matrix selection, placement, and contouring, to achieve optimal restorative results and minimize complications.

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Dentin-Enamel Junction (DEJ)

The junction between the dentin (inner layer) and the enamel (outer layer) of a tooth.

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Removal of Remaining Caries

The process of removing remaining decay from a cavity before placing the restorative material.

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Liners and Bases

Materials placed on the floor of a cavity to protect the tooth's sensitive inner layer.

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Cleaning the Cavity

A process that ensures a clean and prepared cavity before restorative material is placed, free from debris and contaminants.

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Visualizing the Cavity Box

The location of the cavity box within a tooth, taking into account its anatomical features and the surrounding tooth structure.

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Retention Form

The design principle that ensures the restorative material is held securely in place and prevents it from dislodging during biting forces.

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Primary Retention in Composite Restoration

The use of converging proximal walls in a cavity preparation to prevent displacement of the restorative material.

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Dovetails

Additional retention features, such as angled grooves or projections, that help to ensure secure placement of the composite material.

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Study Notes

Class II Cavity Design Overview

  • Class II restoration targets proximal surfaces of posterior teeth, addressing smooth surface caries and compound restorations.
  • Originates beneath the contact point to effectively restore tooth integrity.

Diagnosing Class II Lesions

  • Radiographic evidence shows lesions penetrating 2/3 of the enamel before reaching the dentin-enamel junction (DEJ).
  • CariVu is a diagnostic tool that uses illuminated imaging to identify caries.

Cavity Preparation Terminology

  • Cavosurface margin denotes the junction between prepared and unprepared tooth surfaces.
  • Isthmus refers to the narrow area connecting facial and lingual cusps within the cavity prep.

Structural Integrity in Restorations

  • The longevity of restorations relies heavily on the amount of remaining tooth structure.
  • Poor cavosurface margins lead to unsatisfactory restoration prognoses.

Tooth Preparation Techniques

  • Initial steps require outline, resistance, retention, and convenience forms.
  • Outline form defines the prep shape, while resistance form comprises factors that prevent tooth and restoration fractures.
  • Retention form prevents displacement, and convenience form facilitates restorative ease.

Final Steps in Cavity Prep

  • Removal of remaining caries, pulpal protection with liners/bases, and cleaning the cavity are critical final steps before restoration.

Composite Design Principles

  • Composite restoration design follows caries extension principles and cavity preparation guidelines.
  • Visualize the cavity box's location relative to anatomical features before starting prep.

Resistance and Retention Forms

  • Resistance form involves angular orientations and maintaining supporting tissues for upper marginal ridges.
  • Primary retention is achieved through converging proximal walls, with dovetails aiding in preventing displacement.

Matrix and Wedge Placement

  • Matrix systems mechanically restore proximal contacts and control material extrusion during filling.
  • Proper adaptation is crucial; wedges should be positioned to seal gingival floors and allow tooth separation.

Matrix Selection and Techniques

  • Universal matrices are used in preparations lacking adjacent teeth or large cavities.
  • Specific bands accommodate unique cavity shapes or positions without hindering adjacent tooth contact.

Challenges in Class II Restorations

  • Back-to-back restorations and subgingival cavities present difficulties in achieving proper margins.
  • Proper technique and material use are essential to prevent weak or missing contacts.

Solutions for Improved Outcomes

  • Ensure correct matrix contouring and placement before restoring to prevent post-operative issues.
  • Utilize tools and techniques effectively, checking on all apparatus before proceeding with restorative materials.

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Description

This set of flashcards provides a comprehensive overview of Class II cavity design concepts essential for dental restorations. Each card includes terms and definitions related to proximal surfaces of posterior teeth and caries detection. Ideal for dental students looking to enhance their understanding of restorative dentistry.

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