Chapter 3 - Manual; Full Metal Crown Prep

Question 1

5 principles for ALL crowns

Answer 1

1. Preservation of tooth structure
2. Retention and resistance form
3. Structural durability of the restoration
4. Marginal integrity
5. Preservation of the periodontium

Question 2

3 techniques to minimize discoloration of the prepared typodont tooth

Answer 2

1. Reduce speed of handpiece
2. Utilize the cleaning block
3. Use adequate water spray during preparation

Question 3

FMC Functional cusp reduction (Ideal and Acceptable range)

Answer 3

Ideal: 1.5 mm

Acceptable Range: 1.3 to 1.7 mm

Question 4

FMC Central groove reduction (Ideal and Acceptable range)

Answer 4

Ideal: 1.0 mm

Acceptable Range: 0.8 to 1.2 mm

Question 5

FMC Non-functional cusp reduction (Ideal and Acceptable range)

Answer 5

Ideal; 1.0 mm

Acceptable Range: 0.8 to 1.2 mm

Question 6

FMC Path of withdrawal (Ideal and Acceptable range)

Answer 6

Ideal: Parallel to long axis

Acceptable range: + or - 5 degrees of long axis

Question 7

FMC Convergence (IDeal and Acceptable)

Answer 7

Ideal: 6 degrees

Acceptable range: 2 to 10 degrees

Question 8

FMC Chamfer width (Ideal and Acceptable)

Answer 8

IDeal: 0.5 mm

Acceptable range: 0.3 to 0.7

Question 9

FMC Chamfer placement (Ideal and Acceptable)

Answer 9

Ideal: 1.0 mm from FGM
Acceptable: 0.7 to 1.3 mm from FGM

Question 10

FMC Interproximal chamfer clearance (Ideal and Acceptable)

Answer 10

Ideal: 0.5 mm from adj tooth
Acceptable: 0.3 to 0.7 mm from adj tooth

Question 11

FMC: round line angles or sharp angles?

Answer 11

No Sharp Angles!!