Caries

Question 1

Is firm dentine remineralizable?

Answer 1

Yes

Question 2

During the initial tooth preparation
procedures, the depth of the preparation
extends to:

a. Just inside enamel.
b. Just inside dentin.
c. Where needed to remove soft dentin.
d. Where needed to remove firm dentin.

Answer 2

b. Just inside dentin

Question 3

Moderate caries lesions should be removed to:

a. Hard dentin.
b. 0.2 mm within dentin.
c. Firm dentin.
d. Soft dentin to avoid pulp exposure.

Answer 3

c. Firm dentin

Question 4

The best technique to avoid pulp exposure is:

a. Selective removal to firm dentin.
b. Selective removal to soft dentin.
c. Non selective removal to hard dentin.
d. Use a polymeric restorative material.

Answer 4

b. Selective removal to soft dentin

Question 5

How do we arrest caries in a non cavitated white spot lesion?

Answer 5

Pit and fissure sealants with frequent monitoring

Question 6

What is more important for the Arrest of a lesion?

(a) complete removal of all bacteria
(b) the protection of thepulp
(c) tight peripheral seal for the restoration

Answer 6

(c) tight peripheral seal for the restoration

Question 7

Which dentin is deformed when pressed with hand instrument?

a) soft
b) hard
c) firm
d) leathery

Answer 7

a) soft

Question 8

Initial, white spot lesions are only visible
when:

a. Dry.
b. Wet.
c. Dry and wet.
d. Only after we start removing them with a bur

Answer 8

a. Dry

Question 9

Firm dentin:

a. Has normal mineral content.
b. Is demineralized.
c. Cannot repair.
d. Has the same hardness with normal dentin.

Answer 9

b. Is demineralized

Question 10

Leathery dentin is located:

a. Between soft and firm dentin.
b. Between enamel and dentin caries.
c. On the upper part of the lesion, close to the
DEJ.
d. Below firm dentin, just before hard dentin.

Answer 10

a. Between soft and firm dentin.

Question 11

Polycrystalline restorative materials require a
more aggressive preparation than polymeric
restorative materials.

a. True.
b. False.
c. They have no different requirements for tooth
preparation.

Answer 11

a. True

Question 12

A compound tooth preparation is when:

a. One surface is involved.
b. Two or three surfaces are involved.
c. Four or more surfaces are involved.
d. A preparation with a proximal box.

Answer 12

b. Two or three surfaces are involved

Question 13

An axial wall is:

a. A synonym for a pulpal wall.
b. An internal wall that is perpendicular to the
long axis of the tooth.
c. An internal wall that is parallel to the long axis
of the tooth.
d. Any prepared wall that does not extend to the
external tooth surface.

Answer 13

c. An internal wall that is parallel to the long axis

of the tooth

Question 14

Primary resistance form is the shape of the
tooth preparation that will:

a. Protect the restoration from breaking.
b. Protect the restoration from dislodging.
c. Protect the tooth from breaking.
d. Provide access and visibility to the caries lesion.

Answer 14

a. Protect the restoration from breaking

c. Protect the tooth from breaking

Question 15

Converging walls of a tooth preparation is part
of the:

a. Primary resistance form.
b. Primary retention form.
c. Secondary resistance form.
d. Secondary retention form.

Answer 15

b. Primary retention form

Question 16

During replacement of a restoration due to
secondary caries, the old, remaining
restorative material or base should be:

a. Always removed so we know we have a caries
free tooth preparation.
b. Removed if it is close to the pulp.
c. Left as a base if its surrounded by normal
dentin.
d. Removed if the pulp is symptomatic.

Answer 16

c. Left as a base if its surrounded by normal
dentin

d. Removed if the pulp is symptomatic