1/24: Intro to Fixed Prosth and Full Coverage Preps Flashcards
What is an indication to used fixed prosthodontics/full coverage preparations?
Where there has been extensive coronal destruction
- caries
- Trauma
- Previous restorations
- Endodontically treated posterior teeth
- Where maximum retention and resistance form is needed
- Where axial and occlusal contour require sub
What is a contraindication?
- Where more conservative restoration can function (i.e., parietal veneer crown)
- Estheics
Where does the functional cusp bevel to?
1.5mm tapers to 1.0mm
What is the full depth of the retention groove?
depth of a 170L bur
What is the morphologic occlusal reduction of a functional cusp?
1.5 mm
What is the morphologic occlusal reduction of a central fossa?
1.5mm
What is the morphologic occlusal reduction of a non-functional cusp?
1.0mm
What is the size of a chamfer margin?
0.5 mm
What is the size of the axial reduction?
0.5-1.0mm
What is the complete metal crown preparation sequence?
- Occlusal reduction/functional cusp bevel
- Axial reductino
- Proximal reduction
- Secondary retentive deatures (if required)
- Margination
What is occlusal reduction?
Depth-orientation grooves
Round-end taper diamond (5856L-016)
What do depth cuts follow?
Typically following the incline of the tooth
On a complete metal crown what is the clearance on functional cusps and central grooves?
1.5m clearance
On a complete metal crown what is the clearance on non-functional cusps?
1mm
What bur should you use to make a functional cusp bevel?
Round-end taper diamond (5856L-016)
What does the functional cusp bevel realign?
The functional cusps with the opposing central groove
Where should there be parallelism?
Facio-lingual
Mesio-distal
What bur should you use for proximal axial reduction?
Needle chamfer diamond (5878K.012)
Small chamfer diamond (6878K.016)
What bur should you use for a margination-finish line?
Small chamfer tapered diamond (6878K-016)
