Question 1

If a ceramic crown repeatedly fractures on the facial incisal of tooth #8. the MOST likely cause is tooth preparation with which of the following?

Options :

A : Rounded incisal edge

B : Minimal chamfer finish line

C : Nearly uniform reduction of 1.5 mm

D : Taper of 8 degrees

Answer: B

Question 2

Proper preparation guidelines for indirect all-porcelain inlay restorations include:

Options :

A : sharp internal angles, rounded cavosurface margins, and 2.0 mm isthmus width

B : depth of at least 1.5 mm, butt joint gingival margins, and rounded internal angles

C : depth of at least 1.5 mm, rounded internal angles, and feather-edge gingival margins.

D : depth of at least 1.0 mm, butt joint gingival margins, and sharp cavosurface margins.

Answer: B

Question 3

Using the principles of golden proportion, the ideal width of a central incisor should be what percent of its length?

Options :

A : 65% - 69%

B : 70% - 74%

C : 75% - 79%

D : 80% - 84%

Answer: A

Question 4

What minimum distance is needed between an implant and the root of a tooth in order to keep the tooth's bony attachment intact and prevent horizontal bone loss?

Options :

A : mm

B : mm

Answer: B

Question 5

As a general principle, how much enamel should be reduced for a porcelain veneer?

Options :

A : As much as necessary to facilitate fabrication of an esthetic restoration

B : Adequate reduction so the lab technician can block out undercuts

C : As much as necessary to decrease the need for temporization and improve bonding

D : No more than 1.0 mm of enamel should be removed

Answer: D

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