Question 1

What does the ADA Seal of Approval for dentifrices ensure for the consumer?

Accepted Answer

A)   Stains will be removed.
B)   Abrasives are within safe limits.
C)   The paste will prevent cavities.
D)   It is not harmful if swallowed. B

Question 2

Which of the following scales ranks materials by their relative resistance to abrasion?

Accepted Answer

A)   Brinell
B)   Moh
C)   Vickers
D)   Knoop B

Question 3

Which of the following is true of abrasive materials in dentifrices?

Accepted Answer

A)   The abrasive agents improve the efficiency of the toothbrush in the removal of stains,food debris,and biofilm.
B)   Abrasive agents decrease the light reflected by the enamel.
C)   Higher abrasive rankings are desirable to prevent removal of softer tooth structures and restorations.
D)   Toothpastes do not contain abrasive materials. A

Question 4

When using hand instruments for margination,use very sharp instruments and begin _____ to the margin of the restoration,using a shaving motion in _____ overlapping strokes.

Accepted Answer

A)   coronal;horizontal
B)   coronal;vertical
C)   apical;diagonal
D)   apical;vertical

Question 5

Why shouldn't prostheses with metal components be placed in dilute acid solutions or hypochlorites (bleach)?

Accepted Answer

A)   Subsequent bad taste when reinserted into the patient's mouth
B)   The resultant corrosion of these components
C)   Release of hydrogen sulfide gas
D)   Darkening of the prostheses

Question 6

Which of the following is true of microabrasion?

Accepted Answer

A)   It utilizes sodium bicarbonate powder.
B)   It is not meant to be used intraorally.
C)   It is recommended for removal of stain from teeth.
D)   It can be used to remove minimal amounts of tooth structure.

Question 7

Margination may be indicated if the overhang is _____,the contact is _____,and there is no indication of caries.

Accepted Answer

A)   small;open
B)   small;closed
C)   large;open
D)   large;closed

Question 8

Match the items with the correct description below.
-Tin oxide

Accepted Answer

A)  An extremely fine abrasive used extensively as a final polishing agent for enamel and restorations
B)  A natural abrasive composed of quartz and silica
C)  Volcanic silica manufactured as a loose abrasive
D)  A synthetic material that produces an extremely hard and efficient abrasive material
E)  A synthetic abrasive;the powder form is used in sandblasting restorations in preparation for cementation

Question 9

Which of the following choices will affect the abrasiveness of polishing agents?

Accepted Answer

A)   Number of particles utilized
B)   Hardness of the material
C)   Speed of the device
D)   All of the above

Question 10

Match the items with the correct description below.
-Sand

Accepted Answer

A)  An extremely fine abrasive used extensively as a final polishing agent for enamel and restorations
B)  A natural abrasive composed of quartz and silica
C)  Volcanic silica manufactured as a loose abrasive
D)  A synthetic material that produces an extremely hard and efficient abrasive material
E)  A synthetic abrasive;the powder form is used in sandblasting restorations in preparation for cementation

Question 11

Proper finishing,polishing,and cleaning of tooth structures and restorative materials _____ of the restorative material.
1)improves the esthetics
2)improves the tissue health
3)increases the longevity

Accepted Answer

A)   1,2,3
B)   1,2
C)   1,3
D)   2,3

Question 12

Which of the following is correct regarding staining at the margins of composite restorations due to microleakage?

Accepted Answer

A)   Easily removed with traditional prophy paste
B)   Cannot be polished away
C)   Should be removed with an air-polishing device
D)   Can be removed by polishing for an extended length of time (longer than 5 minutes)

Question 13

A higher number of particles or flutes on a rotary finishing bur _____ its abrasive intensity.

Accepted Answer

A)   increases
B)   decreases
C)   has no impact on

Question 14

What is the purpose of approved denture cleansers?

Accepted Answer

A)   Freshen the acrylic
B)   Loosen stains and plaque
C)   Will not abrade the material
D)   All of the above are true.

Question 15

Abrasive particles that are _____ will cut more efficiently.

Accepted Answer

A)   large and regular
B)   large and irregular
C)   small and regular
D)   small and irregular

Question 16

What could happen if utilizing a high-speed handpiece while using an abrasive agent?

Accepted Answer

A)   Reduce the time it takes to finish the restoration
B)   Increase the finishing strength of the abrasive
C)   Cause loss of control over the handpiece
D)   Decrease the bioburden generated

Question 17

Which of the following is true concerning the hardness of porcelain relative to enamel and dentin?

Accepted Answer

A)   Porcelain is harder than enamel and dentin.
B)   Porcelain is harder than enamel but softer than dentin.
C)   Porcelain is harder than dentin but softer than enamel.
D)   Porcelain is softer than enamel and dentin.

Question 18

Polishing the contact area between restored teeth is:

Accepted Answer

A)   desirable for esthetic reasons.
B)   undesirable because it may leave an open contact.
C)   undesirable because it increases treatment time.
D)   desirable for esthetic and functional reasons.

Question 19

Abrasive particles:

Accepted Answer

A)   lose shape over time.
B)   are efficient only if large.
C)   do not change size with use.
D)   gradually get smaller as they are used.

Question 20

The philosophy of _____ polishing is regarded as the most appropriate approach in the selection of which teeth and surfaces to polish.

Accepted Answer

A)   aggressive
B)   complete
C)   selective
D)   no

Exam 13: Abrasion, finishing, and Polishing