10 Questions
What is one disadvantage of conventional types of all-ceramic crowns?
Wear on the functional cusps of natural opposing teeth
In what cases would a more conservative restoration be inadequate, making an all-ceramic crown necessary?
Malformed, malposed, or rotated anterior teeth
What is a contra-indication for using an all-ceramic crown?
Short clinical crown
What advantage does an all-ceramic crown offer over a PFM on the labial surface?
More conservative preparation
What is the aim of incisal preparation for all-ceramic crown?
Provide adequate incisal clearance
Which tool is used for lingual preparation in all-ceramic crown preparation?
Palatal fossa
What is the purpose of axial finishing in all-ceramic crown preparation?
Smooth the axial surfaces
What type of reduction is required in proximal preparation for all-ceramic crown?
6-degree taper
What should be checked during 'Checking the preparation' stage in all-ceramic crown preparation?
Proximal reduction
What is the purpose of buccal & lingual reduction in all-ceramic crown preparation?
Remove natural undercuts
Study Notes
All-Ceramic Crowns
- One disadvantage of conventional types of all-ceramic crowns is that they can be prone to fracture.
Indications for All-Ceramic Crowns
- A more conservative restoration may be inadequate in cases where there is significant tooth structure loss, making an all-ceramic crown necessary.
Contra-Indications for All-Ceramic Crowns
- A contra-indication for using an all-ceramic crown is when the bite is heavy, as the crown may fracture under excessive force.
Advantages of All-Ceramic Crowns over PFM
- All-ceramic crowns offer a more aesthetically pleasing option over PFM (Porcelain-Fused-to-Metal) crowns on the labial surface.
Incisal Preparation
- The aim of incisal preparation for all-ceramic crowns is to create space for the ceramic material while maintaining a functional incisal edge.
Lingual Preparation
- A diamond bur is used for lingual preparation in all-ceramic crown preparation.
Axial Finishing
- The purpose of axial finishing in all-ceramic crown preparation is to create a smooth surface for the ceramic material.
Proximal Preparation
- A minimum of 1.5mm reduction is required in proximal preparation for all-ceramic crowns.
Checking the Preparation
- During the 'Checking the preparation' stage, the dentist should check for adequate reduction, smoothness, and freedom from undercuts.
Buccal and Lingual Reduction
- The purpose of buccal and lingual reduction in all-ceramic crown preparation is to provide sufficient space for the ceramic material and to allow for proper fit and aesthetics.
Learn about the advantages and disadvantages of all-ceramic crown preparation, including superior esthetics, good tissue response, and color stability. Understand the disadvantages such as low strength and less conservative preparation.
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