Manual - Chapter 2

Question 1

For an anterior MCC, what is the width of the shoulder? Incisal edge reduction? The clearance between opposing teeth? In the protrusive position?

Answer 1

• 1.2 mm
• 2.0 mm
• 1.0 mm
• 2.0 mm

Question 2

What are the borders of the labial first plane of an MCC prep? Of the second plane?

Answer 2

• first plane: from gingival crest to junction of incisal and middle thirds
• second plane: from junction of middle and incisal thirds to incisal edge

Question 3

What is the purpose of the first plane of an MCC? Of the second plane?

Answer 3

• first plane: establishes POW and gives space for veneering medium
• second plane: uniform thickness of porcelain

Question 4

At what angle should the MCC prep converge facial-lingually? Mesio-distally?

Answer 4

6 degrees for both

Question 5

Maxillary teeth are inclined ___ degrees to the ___.

Answer 5

30 degrees to the labial

Question 6

What is the difference in incisal reduction between an incisor and canine for an MCC?

Answer 6

incisor has straight reduction while canine has 2 planes

Question 7

With what bur is the lingual second plane of an anterior MCC reduced?

Answer 7

285.5M (football) bur

Question 8

When is a sloped shoulder used? When is a 90 degree shoulder used?

Answer 8

• sloped shoulder is used if the metal covers the shoulder area on the final crown
• 90 degree shoulder is used whenever a porcelain labial margin is to be used for an MCC; the sloped shoulder design is not advised for porcelain margins since it would result in a thin area of porcelain

Question 9

Where should the margin of an MCC prep be placed?

Answer 9

0.5 mm from the free gingival margin