prostho fixed

Question 1

height of crown

Answer 1

3mm minimum for incisors and premolars
– 4mm minimum for molars

Question 1

Minimum metal thickness

Answer 1

– 0.5mm at the margin
– 1.0mm at non-contact areas
– 1.5mm contact areas

Question 2

Minimum PFM thickness= NON-CONTACT AREAS

Answer 2

– 1.5mm (1.2mm porcelain, 0.3mm metal)

Question 3

• Optimal PFM thickness= CONTACT AREAS

Answer 3

– 2.0mm (1.5mm porcelain, 0.5mm metal)

Question 4

reduction and clearance must be

Answer 4

1.5-2 mm

Question 5

Connectors for PFM bridges should have a minimum of ? height

Answer 5

3mm

Question 6

High noble alloys are ?? noble

Answer 6

≥60%

Question 7

crown delivery sequence

Answer 7

1. Shade (esthetics)
2. Proximal contacts
   – Open send crown back
   – Heavy àadjust before moving on
3. Margins
4. Fit
5. R&R form
6. Occlusion
7. Contour
8. Cement

Question 8

steps for making the crown

Answer 8

waxing
spruing
investing
burnout
casting
recovery
quenching

Question 9

shrinkage porosity

Answer 9

too thin