Anterior Metal-Ceramic Crown Preparation MCC (PFM)

Question 1

What are two consequences of under-preparation

Answer 1

opaque looking crown

over contoured gingival margin

Question 2

What are two consequences of over-preparation

Answer 2

irreversible pulpitis

exposure

Question 3

What is it that must be preserved involving maintaining the line angles of the tooth

Answer 3

pulp horns could be near the line angles

Question 4

What are the three chamfer diamonds

Answer 4

770. 8
771. 8
772. 6

Question 5

What are the two shoulder diamonds

Answer 5

702. 8

515. 7

Question 6

What are the two cavosurface margins on the facial

Answer 6

porcelain labial margin (90º)
sloped shoulder (120º)

Question 7

What is the width of the chamfer of the lingual

Answer 7

0.5mm

Question 8

What is the proper incisal reduction

Answer 8

2.0mm

Question 9

What is the ideal labial reduction

Answer 9

1.5mm

Question 10

What is the ideal lingual reduction

Answer 10

1.0mm

Question 11

What is the depth of the sloped shoulder

Answer 11

1.2mm

Question 12

Where should you put the height of the shoulder/chamfer

Answer 12

0.5mm above gingival margin
1.0mm from the CEJ
which ever is more coronal

Question 13

What should you put the clinical shoulder/chamfer

Answer 13

1.0mm subgingival

Question 14

What two techniques would you use to identify lipping

Answer 14

visual

tactile

Question 15

What can cause lipping

Answer 15

when the chamfer diamond is used at more than 1/2 the depth