prostho fixed Flashcards
1
Q
height of crown
A
3mm minimum for incisors and premolars
– 4mm minimum for molars
1
Q
Minimum metal thickness
A
– 0.5mm at the margin
– 1.0mm at non-contact areas
– 1.5mm contact areas
2
Q
Minimum PFM thickness= NON-CONTACT AREAS
A
– 1.5mm (1.2mm porcelain, 0.3mm metal)
3
Q
- Optimal PFM thickness= CONTACT AREAS
A
– 2.0mm (1.5mm porcelain, 0.5mm metal)
4
Q
reduction and clearance must be
A
1.5-2 mm
5
Q
Connectors for PFM bridges should have a minimum of ? height
A
3mm
6
Q
High noble alloys are ?? noble
A
≥60%
7
Q
crown delivery sequence
A
- Shade (esthetics)
- Proximal contacts
– Open send crown back
– Heavy àadjust before moving on - Margins
- Fit
- R&R form
- Occlusion
- Contour
- Cement
8
Q
steps for making the crown
A
waxing
spruing
investing
burnout
casting
recovery
quenching
9
Q
shrinkage porosity
A
too thin
