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27 Cards in this Set

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other names for full crown prep
full veneer crown prep
cast crown
full metal crown
functional cusp bevel
structural durability
this is occlusal reduction around edge
planar occlusal reduction
structural durability
is done on occlusal table
axial reduction
retention and resistance
is reduction down to finish line of prep
why do a full cast crown
-predictable resorative outcome
-average lifespan of 7-10 years
-high resistance and retention values, when compared to partial veneer
what are the indications to create a full cast crown
-used on teeth that need maximum retention
-functional cusp fracture
-retainer for FPD (fixed pros. denture)
-non esthetic zone
-axial surface has caries
-existing restoration involves four or more tooth surfaces
restoration variations
-all metal
-metal ceramic
-all ceramic
the reduction amounts vary, more for ceramic less for metal
depth groove placement
-along the incline planes
-bur is perpidicular to long axis of tooth
-not on crest of ridges
-reduce only 1.0 on guiding
-reduce 1.5 on supporting
finish line
1.0 mm above the hard gingiva and 1.0mm in axial removal
criteria for good evaluation of crown prep
-smooth and uniform
-occlusal reduction varified with ball reduction
-evaluate for undercuts (make sure there are no over hangs)
purpose of seating groove (these are not done in class)
-provide resistance and retention
-orients the provisional
factors related to design and material selection for restoration
-destruction of tooth surface
-esthetics
-plaque control
-financial considerations
-retention
considerations for destruction of tooth surface
-extent of decay
-cusp fracture
esthetic considerations
-visibility of tooth
-patient expectations
-can dentist achieve desired cosmetics
-can be partial or full veneer
-can be metal or ceramic
plaques control considerations
-contour should allow for cleaning and increases sucess
-patient motivation to brush
What are the components of the PFM restoration
Metal copinq
Porcelain veneer
three steps to masking a metal coping
Opaque layer
Body layer
Incisal layer
Characterization of metal coping
craze lines
interproximal shading
.5 to .3 mm thick
The incisal reduction for the anterior PFM preparation follows
lingual apical slope
Parallel to the former incisal edge
The lingual reduction for the anterior PFM preparaticn is
Should be 1.5 mm
This wall should be parallel to the gingival aspect of the axiofacial wall
transition area
This is where the bevel of the shoulder finish line joins the chamfer

Location is lingual to the proximal contact
features of anterior pfm
-Two plane axiofacial reduction (incisal/gingival)
-Shoulder bevel facial finish line (1.5 mm)
-Chamfer lingual finish line (1.0 mm)
-Planar incisal reduction (1-1.5mm)
posterior PFM occlusal reduction
1.5 to 2.0

reduction is parallel to the occlusal plane
posterior pfm axial reduction
1.5 - 2.0

facial bevel on shoulder finish line is placed at a 45 degree angle
posterior pfm lingual reduction
1
transition in posterior PFM
is variable based on desired contact design
reduction for ceramic prep
2mm all around