Different Designs of Class V Cavity Preparations
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Questions and Answers

What is the purpose of the groove retention form in Class V tooth preparations?

  • To enhance retention of the restoration (correct)
  • To improve moisture tolerance
  • To eliminate the need for enamel margins
  • To create a smoother surface margin

    • Why are retention grooves on the incisal aspect rarely required in Class V cavity preparations?

  • They are rarely necessary due to decreased salivary function
  • They are rarely necessary due to improved moisture tolerance of the materials used
  • They are rarely necessary due to the presence of enamel margins for etching and bonding
  • They are rarely necessary due to increased retention provided by other features of the preparation (correct)

    • When is glass ionomer material the material of choice for restoring Class V cavities?

  • If the tooth is medically compromised and needs a cariostatic effect
  • If patient motivation is decreased and enamel margins cannot be prepared
  • If the cavity is extended onto the root and there is no enamel margin for etching and bonding (correct)
  • If moisture control is impossible due to decreased salivary function

    • Why is glass ionomer material preferred over resin modified glass ionomer (RMGI) in certain cases?

    <p>Due to improved moisture tolerance, polyacid-modified composites may be an appropriate choice</p> Signup and view all the answers

    What type of bur can be used to define the internal angles in cavity preparations?

    <p>No.1/4 round bur</p> Signup and view all the answers

    What is the initial axial depth inside the DEJ for the preparation?

    <p>0.5 mm</p> Signup and view all the answers

    Which aspect of the tooth preparation form provides no inherent retention?

    <p>Gingival aspect</p> Signup and view all the answers

    What bur size is used to prepare two retention grooves?

    <p>No.1/4 round bur</p> Signup and view all the answers

    What is the purpose of Class V tooth preparation for small or moderate lesions or defects?

    <p>To eliminate the entire enamel lesion or defect</p> Signup and view all the answers

    What is performed all around except at the gingival margin?

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

    What is the overall form of small or moderate Class V tooth preparations?

    <p>Divergent wall configuration and uniform axial surface depth</p> Signup and view all the answers

    What is the primary determinant for the outline form of a Class V amalgam tooth preparation?

    <p>Position of the gingival margin</p> Signup and view all the answers

    What is the recommended axial depth for cavo-surface margins in Class V amalgam tooth preparations?

    <p>1mm total axial depth</p> Signup and view all the answers

    Which type of bur is indicated for areas inaccessible to a fissure bur?

    <p>Round bur</p> Signup and view all the answers

    Where are Class V tooth preparations located?

    <p>Facial and lingual surfaces</p> Signup and view all the answers

    What is the recommended taper of the fissure bur for entering the caries lesion in Class V tooth preparations?

    <p>No. 271</p> Signup and view all the answers

    Which part of the tooth is considerably thicker occlusally and incisally than cervically?

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

    How deep should the axial depth be inside the DEJ for Class V amalgam tooth preparations?

    <p>0.5mm</p> Signup and view all the answers

    What is the primary factor affecting the outline form for Class V amalgam tooth preparations?

    <p>Position of the gingival margin</p> Signup and view all the answers

    What type of bur may be used for the initial tooth preparation in Class V amalgam tooth preparations?

    <p>Appropriate carbide bur</p> Signup and view all the answers

    What is the recommended total axial depth for Class V amalgam tooth preparations?

    <p>1 to 1.25mm total axial depth</p> Signup and view all the answers

    Which factor affects the outline form for Class V amalgam tooth preparations primarily?

    <p>Position of the gingival margin</p> Signup and view all the answers

    What is the recommended axial depth inside cementum for cavo-surface margins in Class V amalgam tooth preparations?

    <p>0.75mm</p> Signup and view all the answers

    Study Notes

    Class V Tooth Preparations

    • The groove retention form is used to provide additional retention for the restoration in Class V tooth preparations.
    • Retention grooves on the incisal aspect are rarely required in Class V cavity preparations because the occlusal surface of the tooth provides sufficient retention.
    • Glass ionomer material is the material of choice for restoring Class V cavities when the lesion is close to the pulp or when aesthetics is not a concern.
    • Glass ionomer material is preferred over resin modified glass ionomer (RMGI) in certain cases due to its superior biocompatibility and ability to release fluoride.
    • A fissure bur can be used to define the internal angles in cavity preparations.
    • The initial axial depth inside the DEJ (Dentino-Enamel Junction) for the preparation is 0.2 mm.
    • The facial and lingual walls of the preparation provide no inherent retention.
    • A 1/4 round bur is used to prepare two retention grooves.
    • The purpose of Class V tooth preparation for small or moderate lesions or defects is to remove decay, prepare the tooth for restoration, and prevent further decay.
    • Beveling is performed all around except at the gingival margin.
    • The overall form of small or moderate Class V tooth preparations is conical.
    • The primary determinant for the outline form of a Class V amalgam tooth preparation is the shape and size of the lesion.
    • The recommended axial depth for cavo-surface margins in Class V amalgam tooth preparations is 0.5 mm.
    • A round bur is indicated for areas inaccessible to a fissure bur.
    • Class V tooth preparations are located on the facial or lingual surfaces of the tooth.
    • The recommended taper of the fissure bur for entering the caries lesion is 12-15°.
    • The enamel is considerably thicker occlusally and incisally than cervically.
    • The axial depth should be at least 0.2 mm inside the DEJ for Class V amalgam tooth preparations.
    • The primary factor affecting the outline form for Class V amalgam tooth preparations is the shape and size of the lesion.
    • A fissure bur may be used for the initial tooth preparation in Class V amalgam tooth preparations.
    • The recommended total axial depth for Class V amalgam tooth preparations is 1.5-2 mm.
    • The primary factor affecting the outline form for Class V amalgam tooth preparations is the shape and size of the lesion.
    • The recommended axial depth inside cementum for cavo-surface margins in Class V amalgam tooth preparations is 0.5 mm.

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    Related Documents

    Class V Cavity Preparations PDF

    Description

    Explore the various designs of Class V cavity preparations, specifically focusing on those for amalgam restoration. Learn about the factors affecting outline form for Class V amalgam tooth preparation, including height of contour and position of the gingival margin.

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