Complete Cast Crown Preparation Quiz
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Questions and Answers

What is the correct depth for reducing nonfunctional cusps during occlusal reduction?

  • 1.0 mm
  • 0.8 mm (correct)
  • 0.5 mm
  • 1.3 mm

    • Which instrument is used to place guiding grooves for occlusal reduction?

  • Round-ended diamond
  • Tapered carbide or narrow, tapered diamond (correct)
  • Straight fissure bur
  • Cross-cut bur

    • What is the required minimum clearance on functional cusps after occlusal reduction?

  • 1.3 mm
  • 1.0 mm
  • 1.5 mm (correct)
  • 2.0 mm

    • What is the taper angle aimed for during axial reduction?

    <p>6 degrees</p> Signup and view all the answers

    Which of the following methods can be used to evaluate occlusal clearance?

    <p>Occlusal reduction gauge</p> Signup and view all the answers

    How deep should the functional cusp bevel be placed during occlusal reduction?

    <p>1.5 mm</p> Signup and view all the answers

    What margin configuration should be used during axial reduction?

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

    In placing alignment grooves for axial reduction, how many grooves should be placed in each wall?

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

    What should be assessed using a periodontal probe during axial reduction?

    <p>The relative parallelism of the alignment grooves</p> Signup and view all the answers

    What is the purpose of leaving islands of tooth structure during axial reduction?

    <p>To use as a reference for adequacy of preparation</p> Signup and view all the answers

    What is the recommended width for the cervical chamfer during preparation?

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

    Which instrument is suggested for finishing the chamfer margin?

    <p>A fine-grit diamond or carbide bur</p> Signup and view all the answers

    What is one of the main benefits of achieving a smooth surface finish after preparation?

    <p>It aids impression making, waxing, investing, and casting</p> Signup and view all the answers

    What must be ensured when performing axial reduction to avoid damaging adjacent teeth?

    <p>Enough time for the cutting instrument to create its own space</p> Signup and view all the answers

    How should line angles be treated during surface finishing?

    <p>They should be rounded to ensure smooth transitions</p> Signup and view all the answers

    What is a key consideration when evaluating the completed preparation?

    <p>Whether all defined criteria have been fulfilled</p> Signup and view all the answers

    What is a primary requirement for preparing a complete metal cast crown?

    <p>Producing a crown of adequate strength</p> Signup and view all the answers

    Which of the following is an advantage of a complete cast crown over partial coverage restorations?

    <p>Greater retention due to full axial coverage</p> Signup and view all the answers

    What is a significant indication for using a complete cast crown?

    <p>Extensive coronal destruction by caries or trauma</p> Signup and view all the answers

    What is a disadvantage of using complete metal cast crowns?

    <p>They can obscure pulp vitality testing</p> Signup and view all the answers

    Which of the following is NOT a contraindication for a complete cast crown?

    <p>Maximum retention and resistance are required</p> Signup and view all the answers

    In what situation may a complete metal cast crown be particularly beneficial?

    <p>For modifying occlusion in supra-erupted teeth</p> Signup and view all the answers

    What is the minimum occlusal clearance required on a functional cusp for a complete cast crown?

    <p>1.5 mm</p> Signup and view all the answers

    Which technique is followed first during the preparation of a tooth for a complete cast crown?

    <p>Occlusal reduction</p> Signup and view all the answers

    Why might a patient object to receiving a complete cast crown?

    <p>Metal display may be a concern in a normal smile line</p> Signup and view all the answers

    Which of the following is NOT an advantage of complete metal cast crowns?

    <p>Facilitating temporary restorations</p> Signup and view all the answers

    In which scenario would a complete cast crown be considered the restoration of choice?

    <p>No remaining buccal or lingual wall</p> Signup and view all the answers

    What is the aim of occlusal reduction during the crown preparation process?

    <p>Establish the desired clearance for restorative material</p> Signup and view all the answers

    What aspect of complete cast crowns may affect the ability to perform electric vitality testing?

    <p>The metal's conductivity interferes with the test</p> Signup and view all the answers

    Which of the following is a situation where complete cast crowns are particularly indicated?

    <p>For teeth with significant structural compromise</p> Signup and view all the answers

    What would likely necessitate the use of a complete cast crown over a partial coverage restoration?

    <p>Need for correction of axial contours</p> Signup and view all the answers

    Which of the following conditions indicates a complete cast crown may be used?

    <p>High displacement forces expected</p> Signup and view all the answers

    What is the minimum recommended occlusal clearance for non-centric cusps when preparing a cast crown?

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

    What is the ideal taper or convergence angle between opposing axial surfaces during cast crown preparation?

    <p>6 degrees</p> Signup and view all the answers

    What should be done if excessive tapering occurs on the opposing axial walls during crown preparation?

    <p>Implement a restricted taper of 6 degrees</p> Signup and view all the answers

    Which characteristic should the margin have when preparing a cast crown?

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

    For a functional cusp bevel, what is the recommended angle to the long axis?

    <p>45 degrees</p> Signup and view all the answers

    What is the minimum clearance required for a non-functional cusp bevel?

    <p>0.6 mm</p> Signup and view all the answers

    During preparation, what must be ensured regarding undercuts between opposing axial walls?

    <p>They cannot be accepted</p> Signup and view all the answers

    What should be done if light is visible between the instrument and the axial surface of the prepared tooth?

    <p>Ensure the diamond rests on the chamfer</p> Signup and view all the answers

    Signup and view all the answers

    Study Notes

    Complete Cast Crown Preparation

    • Definition: A full metal crown is an all-metal restoration that restores the functional properties of a prepared tooth.

    Requirements (Criteria)

    • Removal of Tooth Structure: Adequate tooth structure must be removed.
    • Preservation of Remaining Structure: Remaining tooth structure should be preserved.
    • Acceptable Crown Strength: The preparation should create a crown with acceptable strength.

    Advantages

    • Greater Retention: Compared to more conservative restorations (e.g., three-quarter crowns), full metal crowns offer greater retention because all axial tooth surfaces are included in the preparation.
    • Improved Resistance Form: Full metal crown preparations have a superior resistance form compared to partial coverage restorations.
    • Superior Strength: Compared to other restorations, complete metal crowns have superior strength.

    Clinical Situations

    • Malaligned Teeth: The operator can modify the axial tooth contour.
    • Furcation Involvement: Recontouring buccal and lingual walls can improve oral hygiene.
    • Removable Partial Dentures: Useful for creating properly shaped survey lines, guide planes, and occlusal rests.
    • Occlusion Modification: Facilitates easy modification of the occlusion, particularly with supra-erupted teeth or when the occlusal plane requires re-establishment.

    Disadvantages

    • Less Conservative: Compared to partial coverage restorations, complete cast crowns involve more surface areas, potentially impacting the pulp and periodontium.
    • Electric Vitality Testing: Metal conductivity interferes with electric vitality tests on abutment teeth.
    • Patient Aesthetic Concerns: Patients may find the metal display associated with complete cast crowns undesirable (especially in maxillary molars/premolars/molars and mandibular molars and premolars) with normal smile lines.

    Indications

    • Single Crowns: Can be used as a single crown or a retainer for fixed partial dentures (FPD).
    • Posterior Teeth: Suitable for posterior maxillary molars, mandibular molars, and premolars, particularly when maximum retention and strength are needed.
    • Extensive Coronal Destruction: Useful in cases of extensive coronal destruction due to caries or trauma.
    • Short Clinical Crowns: Used on posterior short clinical crowns.
    • High Displacement Forces: Appropriate for retaining long-span FPDs anticipating high displacement forces (e.g., retained long-span FPDs.)
    • Correction of Axial Contours: When correction of axial contours is not possible with a more conservative technique.
    • Removable Partial Dentures: Useful for supporting removable partial dentures.

    Contraindications

    • More Conservative Restorations: If treatment objectives can be met with a more conservative restoration.
    • Insufficient Retention and Resistance: When less than maximum retention or resistance is needed (e.g., in short-span fixed partial dentures).
    • High Aesthetic Needs: Contraindicated for high esthetic needs, particularly with anterior teeth.

    Preparation

    • Armamentarium: Includes high-speed contra-angle handpieces, round-ended diamonds (various grits), utility and wax calipers, and occlusal reduction gauges.

    • Occlusal Guiding Grooves: Procedures are used to reduce occlusal structures by following the normal an atomic contour of the teeth and providing adequate space for the restorative material.

    • Occlusal Reduction: Reduction proceeds partially to a reference and then to completion.

    • Axial Alignment Grooves: Placement of grooves in buccal, lingual, mesial, and distal walls to create parallelism with the predetermined path of instrument withdrawal.

    • Axial Reduction: Reduction of the axial surfaces following the predetermined path of instrument withdrawal.

    • Finishing and Evaluation: Final finishing to create a smooth, aesthetically pleasing margin.

    • Verification of Occlusal Clearance: The occlusal clearance must be verified in excursive movements and using various instruments like utility wax, wax caliper, occlusal reduction gauge, occlusion tab, and occlusal ring.

    • Finishing: A smooth surface finish must be achieved, with continuous transition from occlusal to axial surfaces.

    Criteria for Complete Cast Crown Preparation

    • Occlusal Reduction: Adequate space must be provided for the restorative material (1mm on non-centric and 1.5mm on centric cusps.).
    • Occlusal Clearance: Should follow normal an atomic contour.
    • Axial Reduction: Parallel to the long axis with a 6-degree taper and avoiding excessive reduction/over-tapering to prevent compromising the restoration's retention.
    • No Undercuts: No undercuts should be present between opposing axial walls.
    • Functional (Centric) Cusp Bevel: A 1.5mm bevel should be present with a 45-degree incline.
    • Non-functional (Non-centric) Cusp Bevel: 0.6mm of clearance is needed.

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    Related Documents

    Complete Cast Crown Preparation PDF

    Description

    Test your knowledge on the preparation of complete cast crowns in dentistry. This quiz covers the definition, requirements, advantages, and clinical situations related to full metal crowns. Understand the principles that guide effective crown preparation and enhance your clinical skills.

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