DENT1014: PFMs

Metal ceramic restorations (PFM) have a porcelain layer bonded to a metal substructure.

• a) True

• b) False

Which of the following is not a primary function of a metal substructure?

• a) restores emergence profile

• b) forms oxides that bond to porcelain

• c) restore contact points

• d) provides fit of restoration to prepped tooth

Approximately how much space is required for

porcelain application?

• a) 0.5mm

• b) 1.5mm

• c) 1-2mm

• d) 2.5mm

What is the minimum thickness of wax required to be able to cast?

• a) 0.3mm

• b) 0.5mm

• c) 1mm

• b) 1.5mm

There is a uniform thickness of metal; There is no minimum thickness of wax

• a) both statements are true

• b) both statements are false

• c) first statement is true; second statement is false

• d) first statement is false, second statement is true

What margin design has minimal destruction on a tooth?

• a) chamfer

• b) shoulder with bevel

• c) bevel

• d) knife edge

Which margin design provides maximum esthetics?

• a) shoulder

• b) chamfer

• c) knife edge

• d) bevel

Which margin design requires to be prepped sub-gingivally?

• a) shoulder

• b) shoulder with bevel

• c) bevel

• d) chamfer

Which margin design reduces crown strength?

• a) chamfer

• b) knife edge

• c) bevel

• d) shoulder

Metal-ceramic junctions (lingual bands) must...

• a) be well-defined

• b) have a definite finish line

• c) follow the natural emergence profile

• d) all of the above