Class IV Composite Restorations
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Questions and Answers

What are the retentive features of Class IV cavity preparation?

  • Retention grooves
  • Retention pins
  • Beveled margins
  • All of the above (correct)

    • What retention feature is found along the gingivoaxial line angle in Class IV restorations?

    A retention groove

    How are Class IV restorations cut?

    With a bevel around the cavosurface margins

    What is the purpose of beveled margins in Class IV restorations?

    <p>To increase retention of the composite and allow for proper contouring</p> Signup and view all the answers

    Where are retention grooves located?

    <p>At the gingivoaxial, facioaxial, and linguoaxial line angles</p> Signup and view all the answers

    What is the role of the gingivoaxial retention groove?

    <p>Extends the entire length of the line angle</p> Signup and view all the answers

    At what point do facioaxial and linguoaxial line angles begin?

    <p>At the gingival point angles</p> Signup and view all the answers

    Where is the retention pin placed?

    <p>Into the axial wall</p> Signup and view all the answers

    Where are the matrix and wedge placed during a Class IV prep?

    <p>Proximal and apical to the gingival margin of the restoration</p> Signup and view all the answers

    What are the primary functions of a matrix and a wedge?

    <p>To keep the material within the preparation, prevent overhang, and provide a smooth surface</p> Signup and view all the answers

    What type of matrix is used for Class IV restorations?

    <p>Celluloid strip</p> Signup and view all the answers

    What can be used as a matrix?

    <p>Celluloid strip or a celluloid crown form</p> Signup and view all the answers

    Which strip provides more contouring for a Class IV composite?

    <p>Celluloid crown form</p> Signup and view all the answers

    What is used to place the material into the cavity prep?

    <p>The composite placing instrument or the 'Composite Syringe'</p> Signup and view all the answers

    When restoring Class IV cavity preps, which areas must be recreated?

    <p>Mesial incisal edge, mesial marginal ridge, proximal surface, facial surface, and lingual surface</p> Signup and view all the answers

    What surfaces must be contoured to prevent premature occlusal contact?

    <p>Lingual, incisal, and the marginal ridge</p> Signup and view all the answers

    What can damage an over contoured restoration?

    <p>Receiving too much force from biting and chewing</p> Signup and view all the answers

    What can be used to finish a Class IV restoration?

    <p>Finishing discs, stones, burs, and strips</p> Signup and view all the answers

    Large restorations require more sculpting with what instruments?

    <p>Rotary instruments</p> Signup and view all the answers

    What is a green stone used for?

    <p>Very coarse and removes material quickly</p> Signup and view all the answers

    What is a white stone used for?

    <p>Less abrasive and removes material more slowly</p> Signup and view all the answers

    What is special about finishing discs and strips?

    <p>Available in different grits</p> Signup and view all the answers

    How should instruments be held when restoring the Class IV restoration?

    <p>Modified pen grasp</p> Signup and view all the answers

    What should be done to examine a cavity prep?

    <p>Clean and dry area, develop mental image, locate retention grooves</p> Signup and view all the answers

    What is the application of calcium hydroxide meant to do?

    <p>Protect the pulp and remove excess after it sets</p> Signup and view all the answers

    What should be done before the tooth is etched?

    <p>Thoroughly clean with a non-fluoride prophy paste</p> Signup and view all the answers

    What should be used when etching the prep?

    <p>Cotton pellet dipped in etch, moving constantly</p> Signup and view all the answers

    What is the proper bonding technique for the tooth?

    <p>Apply a thin layer to etched surfaces and blow excess with air</p> Signup and view all the answers

    How should the tooth be measured before placing composite?

    <p>With a metric ruler or Boley gauge to measure width</p> Signup and view all the answers

    What should be the approach when trimming the tooth?

    <p>Go away from, not into the tooth</p> Signup and view all the answers

    Study Notes

    Class IV Composite Restorations Overview

    • Class IV cavity preps require specific retentive features for effective restoration.
    • Key retentive features include retention grooves, pins, beveled margins, and etched enamel margins.

    Restoration Characteristics

    • Class IV restorations include a retention groove along the gingivoaxial line angle, supporting the composite at the incisal edge with potential retention pins.

    Preparation Techniques

    • Utilization of a bevel around cavosurface margins enhances restoration bonding.
    • Beveled margins are etched to improve composite retention without over contouring.

    Retention Groove Details

    • Retention grooves are positioned at gingivoaxial, facioaxial, and linguoaxial line angles.
    • The gingivoaxial retention groove spans the line angle's entire length.

    Placement and Function of Components

    • Facioaxial and linguoaxial line angles start from gingival point angles, tapering off towards the DEJ at the incisal surface.
    • Retention pins are positioned in the axial wall to provide additional support.

    Matrix and Wedge Use

    • Matrix and wedge are placed proximal and apical to the gingival margin to maintain material containment and prevent gingival overhang.
    • A celluloid strip serves as the matrix for Class IV restorations, with a celluloid crown form offering more contouring potential.

    Material Application

    • Composite material is placed using a composite placing instrument or syringe, ensuring proper coverage of the prep area.

    Restoration Areas

    • Effective restoration recreates five crucial areas: mesial incisal edge, mesial marginal ridge, proximal surface (including contact area), facial surface, and lingual surface.

    Contour Considerations

    • Surfaces like the lingual, incisal, and marginal ridge must be properly contoured to avoid premature occlusal contacts.
    • An over contoured restoration can be damaged by excessive biting and chewing forces.

    Finishing Techniques

    • Various instruments including finishing discs, stones, and rotary instruments are used to achieve the desired contour of large restorations.
    • Green stones are coarse and efficient for material removal, while white stones are less abrasive for finer adjustments.

    Instrument Handling

    • A modified pen grasp ensures optimal control and stability when restoring Class IV preparations.

    Cavity Preparation Examination

    • Before restoration, ensure cleanliness and dryness of the cavity prep while locating retention grooves.

    Calcium Hydroxide Application

    • Calcium hydroxide is applied over dentin to protect the pulp, ensuring excess is removed after it sets.

    Etching Procedure

    • Thorough cleaning with a non-fluoride prophy paste is essential before etching.
    • An etching procedure involves using a cotton pellet dipped in etch liquid, applied to enamel for one minute.

    Bonding Process

    • A thin, even layer of bonding material must be applied to etched surfaces and cured for 15-20 seconds.

    Measurement for Composite Placement

    • A metric ruler or Boley gauge is used to measure the tooth mesiodistally prior to composite application.

    Trimming Techniques

    • Trimming should always be done away from the tooth to prevent accidental damage.

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    Description

    Test your knowledge on Class IV composite restorations with these flashcards. Covering retentive features, restoration details, and cutting techniques, this quiz is essential for dental students. Enhance your understanding of cavity preparations and the materials involved.

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