Complete Cast Crown Preparation Flashcards
What are the advantages and disadvantages to a full gold crown?
Advantages:
Longevity
Resistance
Conservative
Adjustability
Disadvantages:
Poor Aesthetics
What are the indications for a full gold crown and what is the contraindication?
Indication:
Short clinical crowns
Maximum retention and resistance are needed
High displacement forces
Contraindication:
High aesthetic need
What are the preparation features of a full gold crown?
Occlusal reduction: Non-functional cusp = 1.0mm and functional cusp = 1.5mm
Axial reduction = 1mm
Margin: Chamfer at least 0.5mm reduction
What should be used for a full gold preparation?
Silicon putty
Flat-end tapered bur
Round end tapered bur
Short needle bur
Diamond burs are used for major reduction
Carbide burs are used for refinement
How are diamond and carbide burs different for gold crown preps?
Diamond burs have different grits and roughness to carbide burs
What ar ethe preparation steps for a full gold crown?
Silicone putty index
Occlusal reduction
Buccal and lingual axial reduction
Interproximal reduction
Finishing
Auxiliary retentive features
What is the silicone putty index used for?
Gives a useful guide to original shape of the tooth
Not necessary with every case
Mainly used when major modifications are required in conjugation with wax-up
What are the features of occlusal reduction?
Occlusal guiding grooves are made first
Tapered diamond bur is used with 1mm diameter
Follow anatomic configuration and cuspal inclines.
