18 Questions
What is the primary purpose of fluting the axial walls of a molar complete cast crown?
To allow better access to the furcation area for oral hygiene and improve the long-term prognosis of the restoration
What is a key advantage of using complete cast crowns as retainers for a mandibular removable partial denture?
They offer improved occlusal support and stability for the partial denture
What is a key disadvantage of complete cast crown preparations?
Removal of tooth structure is extensive and can have adverse effects on the pulp and periodontium
What is a key benefit of using metal-ceramic crowns on the canines and premolars?
They are more visible and aesthetic in the anterior arch position
What is the primary purpose of modifying the axial tooth contour when using a complete cast crown?
To accommodate supraerupted teeth or reestablish the occlusal plane
What is a potential disadvantage of complete cast crowns in terms of their relationship to the gingiva?
They are more prone to causing gingival inflammation due to their proximity to the gingival margin
What is the main reason that the minimum dimensions required for occlusal rests of an RPD framework necessitate removing significant amounts of enamel?
To expose the dentin, which requires restoration with a cast crown
When is a complete cast crown indicated on endodontically treated teeth?
When the tooth has undergone endodontic treatment
When is a complete cast crown contraindicated?
When the treatment objectives can be met with a more conservative restoration
What is the recommended restoration when an intact buccal or lingual wall exists?
A partial-coverage restoration
What is the reason for the reduction being directly beneath the cusps of the crown during the preparation for a complete cast crown?
To ensure proper tooth Functional (Centric) Cusp Bevel
When is a more conservative preparation for a fixed partial denture called for?
When an adequate buccal contour exists or can be obtained
When is it not feasible to perform electric vitality testing of an abutment tooth?
After cementation
In what situations is the complete cast crown indicated?
Extensive coronal destruction by caries or trauma
Why might some patients object to the display of metal associated with complete cast crowns?
Concerns about aesthetics
What additional feature should be included in the complete cast crown for teeth with high displacement forces anticipated?
Grooves for retention
When is the complete cast crown used to support a removable partial denture?
When proper contours are challenging with partial-coverage restorations
In which type of teeth are complete cast crowns often restricted in those with a normal smile line?
Maxillary molars and mandibular molars and premolars
Study Notes
Complete Cast Crown Preparation
- A complete cast crown allows the operator to modify axial tooth contour, making it suitable for teeth that require significant changes, such as canines and premolars.
- Fluting of the axial walls of a molar complete cast crown allows better access to the furcation area for oral hygiene and improves the long-term prognosis of the restoration.
Indications and Contraindications
- The complete cast crown is indicated on teeth with extensive coronal destruction by caries or trauma, and when maximum retention and resistance are needed.
- It is contraindicated if treatment objectives can be met with a more conservative restoration, such as when an intact buccal or lingual wall exists.
Disadvantages
- Removal of tooth structure is extensive, which can have adverse effects on the pulp and periodontium.
- The proximity of the margin to the gingiva can cause inflammation of gingival tissues.
Special Considerations
- Proper tooth preparation will result in the reduction being directly beneath the cusps of the crown.
- After cementation, electric vitality testing of an abutment tooth is not feasible due to the conductivity of the metal.
- Patients may object to the display of metal associated with complete cast crowns.
Test your knowledge on the complete cast crown preparation in contemporary fixed prosthodontics. Questions may cover the modification of axial tooth contour, restorations for canines and premolars, and the fluting of axial walls for better access to the furcation area.
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