Dental Preparation Considerations
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Dental Preparation Considerations

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Questions and Answers

Which factor does NOT contribute to increased heat generation during dental procedures?

  • Using water spray (correct)
  • Type of dental material
  • Excessive pressure
  • High rotational speed

    • Chemical agents for cleaning and degreasing are safe to use during tooth preparation.

    False

    What is a crucial step to prevent pulpal damage when restoring teeth?

    Remove all carious dentin.

    To conserve tooth structure, a dentist should use ______ coverage rather than complete coverage restoration.

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

    What should be avoided to minimize pulpal effects during tooth preparation?

    <p>Unnecessary apical extension</p> Signup and view all the answers

    Match the principles of tooth preparation with their descriptions:

    <p>Use partial coverage = Conserve tooth structure Minimal convergence angle = Reduce stress on remaining tooth Even axial surface reduction = Ensure uniform thickness Avoid unnecessary apical extension = Maintain tooth integrity</p> Signup and view all the answers

    What is the broadest category affecting successful tooth preparation?

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

    It is acceptable to apply chemical materials to freshly cut dentin without precautions.

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

    What effect does the thickness of remaining dentin have on pulpal response?

    <p>It is inversely proportional.</p> Signup and view all the answers

    Iatrogenic damage to adjacent teeth can never be prevented during tooth preparation.

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

    What specific method is preferred to protect adjacent tooth structures during preparation?

    <p>Using the proximal enamel of the tooth being prepared.</p> Signup and view all the answers

    The tongue, lips, and cheeks can be protected during tooth preparation with careful _____ using tools like an aspirator tip.

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

    What is NOT a cause of pulpal injury during tooth preparation?

    <p>Improper flossing</p> Signup and view all the answers

    Match the following components with their corresponding considerations:

    <p>Adjacent teeth = Biologic consideration Durability of restoration = Mechanical consideration Appearance of the patient = Esthetic consideration Protection of soft tissues = Biologic consideration</p> Signup and view all the answers

    Extreme temperatures generated during tooth preparation can lead to irreversible pulpitis.

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

    What does a thin tapered diamond help to achieve during tooth preparation?

    <p>Leaves a slight lip or fin of enamel.</p> Signup and view all the answers

    What is the primary disadvantage of excessive taper in tooth preparation?

    <p>Considerable loss of tooth structure</p> Signup and view all the answers

    Which type of margin is suitable for cast metal crowns and metal-ceramic crowns?

    <p>Chamfer margin</p> Signup and view all the answers

    Subgingival restorations are now considered acceptable and beneficial for maintaining periodontal health.

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

    A featheredge margin can provide sufficient bulk at the margin for restorations.

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

    What is axial reduction important for in tooth preparation?

    <p>Securing space for adequate thickness of restorative material</p> Signup and view all the answers

    The __________ placement of the finish line should be in areas where it can be easily cleaned by the patient.

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

    What should be the maximum width of the chamfer prepared margin relative to the diamond tip?

    <p>half the tip of the diamond</p> Signup and view all the answers

    Which of the following is NOT an advantage of supragingival margin placement?

    <p>Better integration with underlying bone</p> Signup and view all the answers

    A __ margin is often associated with excessively tapered preparation or incorrect axial reduction.

    <p>chisel edge</p> Signup and view all the answers

    The deeper the restoration margins are placed in the gingival sulcus, the greater the __________ response.

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

    Match the following margin types with their primary purpose:

    <p>Chamfer margin = Suitable for cast metal crowns Beveled margin = Minimizes marginal discrepancy Featheredge margin = Avoid for restoration due to clashing bulk Shoulder margin = Allows room for porcelain</p> Signup and view all the answers

    Which instrument is recommended for making a chamfer margin?

    <p>Taper diamond stone with a round tip</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Axial Reduction = Secures space for restorative material Supragingival Margin = Facilitates cleaning and maintenance Subgingival Margin = Can lead to periodontitis Finish Line = Area where restoration edges are placed</p> Signup and view all the answers

    What should be avoided during the placement of restoration margins to ensure successful impression taking?

    <p>Tearing or deforming the impression</p> Signup and view all the answers

    Beveling a margin protects the unprepared tooth structure from chipping.

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

    What is the shape of the angle formed by a shoulder margin with the unprepared tooth structure?

    <p>90-degree angle</p> Signup and view all the answers

    Which finish line type provides adequate bulk for restoration but is less conservative to tooth structure?

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

    The Chamfer finish line is more conservative than the Feather Edge finish line.

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

    What is a disadvantage of the Chisel finish line design?

    <p>Difficult to control margin location</p> Signup and view all the answers

    The ______ finish line type is used primarily for cast metal restorations.

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

    Which finish line design is indicated for cases of tilted teeth?

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

    Match each finish line design with its advantage:

    <p>Feather Edge = Conservation of tooth structure Shoulder = Gives adequate bulk for restoration Bevel = Removes unsupported enamel Shoulder with bevel = Gives adequate bulk for the restoration</p> Signup and view all the answers

    A beveled finish line is more conservative than a straight finish line.

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

    What is the main disadvantage of a Beveled finish line?

    <p>Less conservative, requires subgingival extension</p> Signup and view all the answers

    Study Notes

    Biologic Consideration

    • Adjacent teeth: Protecting adjacent teeth from damage is critical during tooth preparation.
      • Using a tapered diamond instrument to carefully remove interproximal contact areas can minimize damage.
      • A metal matrix band can be used as protection, but care should be taken as it is thin and can be perforated.
    • Soft tissue: Careful retraction with instruments is necessary to prevent damage to the tongue, lips, and cheeks.
    • Pulp: Protecting the pulp during preparation is crucial to prevent pulpal injuries.
      • Causes of pulpal injury include extreme temperatures, chemicals, and bacteria.
      • Use water coolant during preparation to help prevent heat buildup.
      • Use cavity varnish to create a barrier between dentin and restorative materials.
      • Bacterial action: Properly removing all carious dentin is important to prevent bacteria from causing further damage.

    Preservation of Tooth Structure

    • Basic tenets: Conserving as much tooth structure as possible is a fundamental principle in restorative dentistry.
    • Thickness of Remaining Dentin: Remaining dentin thickness is important for pulpal health. Thicker dentin results in less pulpal response to treatments.
    • Guidelines for Conservation of Tooth Structure:
      • Employ partial coverage restorations when appropriate.
      • Minimize convergence angle (taper) between axial walls.
      • Ensure even occlusal reduction for uniform thickness in the restoration.
      • Ensure sufficient axial tooth reduction to facilitate proper contouring.
      • Choose margins compatible with the principles of tooth preparation.
      • Avoid unnecessary apical extension of the preparation.

    Considerations Affecting Future Dental Health

    • Axial Reduction: Appropriate axial reduction is needed for sufficient restorative material thickness.
    • Margin Placement: Margin placement influences restoration fabrication and long-term durability.
      • Smooth, exposed margins can be easily finished and kept clean.
      • Margins should be placed in accessible areas for the dentist and patient.
      • Subgingival margins: Avoid subgingival margins because they are associated with periodontal issues.
    • Supragingival Margins: Placing margins supragingivally is recommended for several reasons:
      • Easier to prepare without soft tissue trauma.
      • Easier to finish and keep clean.

    Margin Types

    • Feather Edge: Conserves tooth structure but can lead to over-contoured restorations.
    • Chisel: Conserves tooth structure, but prone to over-contouring.
    • Chamfer:
      • Distinct, well-defined finish line.
      • Provides adequate material bulk.
      • Suitable for cast metal crowns and metal portions of metal-ceramic crowns.
    • Shoulder:
      • Provides adequate bulk for restoration.
      • Less conservative than chamfer.
      • Suitable for full veneered metal-ceramic restorations and all-ceramic crowns.
    • Shoulder with Bevel:
      • Provides adequate bulk.
      • Less conservative than other types.
      • Bevel helps remove unsupported enamel.
      • Suitable for metal-ceramic restorations, and in situations with previous caries or restorations at the margin.
    • Beveled:
      • Removes unsupported enamel.
      • Ideal for ledges due to caries or erosion.

    Finish Line Designs

    • Feather Edge:
      • Conserves tooth structure.
      • Can easily lead to over-contouring.
    • Chisel:
      • Conserves tooth structure.
      • Can lead to over-contouring and is difficult to control.
    • Chamfer:
      • Distinct, well-defined finish line.
      • Provides adequate bulk.
      • Suitable for cast metal crowns and metal portions of metal-ceramic crowns.
    • Shoulder:
      • Provides adequate bulk.
      • Less conservative than chamfer.
      • Suitable for full veneered metal-ceramic crown and all-ceramic crown restorations.
    • Shoulder with Bevel:
      • Provides adequate bulk.
      • Less conservative.
      • Bevel removes unsupported enamel.
      • Suitable for metal-ceramic restorations and in situations with previous caries or restorations at the margin.
    • Beveled:
      • Removes unsupported enamel.
      • Less conservative.
      • Ideal for ledges due to caries or erosion.

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    Description

    This quiz explores the biological considerations and methods for preserving tooth structure during dental procedures. Key topics include protecting adjacent teeth, soft tissue management, and pulp protection during tooth preparation. Learn how to effectively minimize damage and ensure patient safety.

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