Dental Materials Ch. 1

Question 1

In the United States, standards for dental materials are

developed and administered by the:

(a) FDA (Food and Drug Administration)
(b) ADA (American Dental Association)
(c) AADR (American Association for Dental Research)
(d) OSHA (Occupational Safety and Health Administration)

Answer 1

(b) ADA (American Dental Association)

Question 2

All of the following are reasons for a dental hygienist to have knowledge and understanding of dental materials EXCEPT:

(a) Explaining the different types of restorative materials available to the patient
(b) Assessing the patient’s oral condition

(c) Deciding which material is best for the patient’s restora-
tion

(d) Understanding the behavior of dental materials

Answer 2

(c) Deciding which material is best for the patient’s restoration

Question 3

An amalgam restoration located on the gingival third of
tooth #3 would be a Class _____ restoration.

(a) I
(b) II
(c) III
(d) IV
(e) V
(f) VI

Answer 3

(e) V

Question 4

The biologic nature of the oral environment and the size
of the oral cavity restrict the use of dental materials. One
restriction is the degradation of restorations.

(a) The first statement is true; the second statement is false.
(b) The first statement is false; the second statement is true.
(c) Both statements are true.
(d) Both statements are false.

Answer 4

(c) Both statements are true.

Question 5

When the temperature changes in the mouth, the teeth and
most restorative materials expand and contract by the same amount. No leakage occurs around the restoration.

(a) The first statement is true; the second statement is false.
(b) The first statement is false; the second statement is true.
(c) Both statements are true.
(d) Both statements are false.

Answer 5

(d) Both statements are false.

Question 6

Which of the following oral tissues provides feedback to
the individual regarding the forces placed on the tooth?

(a) Pulp
(b) Dentin
(c) Periodontium
(d) Gingival tissue

Answer 6

(c) Periodontium

Question 7

Which of the following restorations are utilized when a
substantial amount of a tooth is missing?

(a) Crown
(b) Pontic
(c) Implant
(d) Fixed partial denture

Answer 7

(a) Crown

Question 8

The design of a cavity preparation aids in the retention of
a restoration. The walls of an amalgam preparation diverge
while the walls of an inlay converge.

(a) The first statement is true; the second statement is
false.

(b) The first statement is false; the second statement is true.
(c) Both statements are true.
(d) Both statements are false.

Answer 8

(a) The first statement is true; the second statement is false.

Question 9

If a restoration is fabricated on a replica (positive reproduc-
tion) of a patient’s teeth, it is referred to as a:

(a) Student model
(b) Cast
(c) Diagnostic cast
(d) Any of the above terms may be used

Answer 9

(b) Cast

Question 10

An example of an indirect restorative material would be:

(a) Amalgam
(b) Glass ionomer cement
(c) Composite
(d) Ceramic (porcelain)

Answer 10

(d) Ceramic (porcelain)

Question 11

Medical devices are grouped into three categories accord-
ing to Medical Device Amendment of 1976. Which class of
devices is most regulated?

(a) I
(b) II
(c) III
(d) IV

Answer 11

(c) III

Question 12

Using Figures 1.9 A and D, which of the following best describes the roots of the teeth?

(a) Calculus is visible on the distal of tooth #2.
(b) Calculus is visible on several roots.
(c) The roots are radiographically foreshortened.
(d) The roots are radiographically elongated.

Answer 12

(a) Calculus is visible on the distal of tooth #2.