Class III & IV Cavity Preparation for Composite Restoration
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Questions and Answers

What is the primary indication for Class III tooth preparations?

  • To create space for orthodontic brackets
  • To restore esthetic prominent areas on anterior teeth (correct)
  • To remove caries on the occlusal surfaces of posterior teeth
  • To prepare for fabricating dental crowns

    • In Class III cavity preparations, what type of margins are considered the best scenario?

  • Mixed enamel and dentin margins
  • Enamel margins only (correct)
  • Dentin margins only
  • No specific margin type is preferred

    • What is the depth of the box shape in Class III cavity preparations on the root surface?

  • 1.5mm
  • 0.5mm
  • 0.75mm (correct)
  • 1mm

    • What is the required angle for the cavosurface margin in Class III cavity preparations?

    <p>90°</p> Signup and view all the answers

    When is the groove retention used in Class III tooth preparations?

    <p>Only when deemed necessary to increase retention</p> Signup and view all the answers

    What is the purpose of beveled conventional cavity preparation?

    <p>To provide additional retention for the restoration</p> Signup and view all the answers

    What are the indications for minimal invasive (modified) conventional cavity preparation?

    <p>When conservation of tooth structure is a priority</p> Signup and view all the answers

    What is the depth of the box shape in Class IV cavity preparations in dentin?

    <p>$0.2mm$</p> Signup and view all the answers

    'Class IV tooth preparations' are located on which surfaces of teeth?

    <p>'Facial' and 'lingual' surfaces of anterior teeth</p> Signup and view all the answers

    'Conventional cavity preparation' for Class III restorations may be indicated when:

    <p>'Gingival and incisal retention' is needed to increase retention</p> Signup and view all the answers

    In Class III cavity preparations, what is the purpose of 'tooth preparation have all – enamel margins'?

    <p>To allow adequate isolation for an effective bond</p> Signup and view all the answers

    What is the primary purpose of preparing 'large Class III tooth preparation extending onto root surface'?

    <p>To improve retention by extending onto the root surface when deemed necessary</p> Signup and view all the answers

    What is the main reason for beveling the enamel walls in a conventional cavity preparation?

    <p>To expose maximum number of enamel rods for etching and bonding</p> Signup and view all the answers

    What is the main feature of a modified cavity preparation?

    <p>Scooped or concave preparation design</p> Signup and view all the answers

    In a small, scoop-shaped Class III tooth preparation, what should the outline form ideally not include?

    <p>Extension onto the facial surface</p> Signup and view all the answers

    What is the preferred approach for beginning a Class III tooth preparation?

    <p>Lingual approach</p> Signup and view all the answers

    When is the facial approach used for tooth preparation?

    <p>All of the above</p> Signup and view all the answers

    What is the primary reason for using diamond stones for tooth preparation?

    <p>To increase the surface area and micromechanical retention</p> Signup and view all the answers

    Which of the following is a cause of class IV tooth preparations?

    <p>All options are causes of class IV tooth preparations</p> Signup and view all the answers

    What is the main objective of bevelled cavosurface margins?

    <p>To increase surface substrate area needed for bonding</p> Signup and view all the answers

    Why is it important not to place a bevel in certain situations?

    <p>To prevent unnecessary removal of tooth structure</p> Signup and view all the answers

    What is the purpose of bevelling in composite restoration?

    <p>To increase the surface area and retention</p> Signup and view all the answers

    In which area would retention be made on bonding dentin and gingival groove?

    <p>Gingival area where thin or no enamel is found</p> Signup and view all the answers

    What is the purpose of hollow ground in composite restoration?

    <p>To avoid overhangs and concave grinding</p> Signup and view all the answers

    When is a long bevel used in composite restoration?

    <p>When there is not enough thickness of enamel to offer retention</p> Signup and view all the answers

    What is the purpose of scalloping in composite restoration?

    <p>To increase the surface area and retention</p> Signup and view all the answers

    What type of bevel involves grinding the entire enamel wall when there is not enough thickness of enamel for retention?

    <p>Full bevel</p> Signup and view all the answers

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