2010 Released Qs And Ans33

Front 1

An epinephrine-containing retraction cord
has the potential of
A. interfering with the setting of the
impression material.
B. causing tissue necrosis.
C. producing a systemic reaction.
D. discolouring gingival tissue.

Back 1

C. producing a systemic reaction.

Front 2

A cast post and core is used to
1. provide intraradicular venting.
2. strengthen a weakened tooth.
3. redirect the forces of occlusion.
4. provide retention for a cast crown.

Back 2

4. provide retention for a cast crown.

Front 3

The gingival margin of the preparation for
a full crown on a posterior tooth, with a
clinical crown that satisfies the
requirements for retention and resistance,
should be placed
A. 0.5mm subgingivally.
B. on the enamel.
C. at least 1mm supragingivally.
D. at the cemento-enamel junction.
E. at the gingival margin.

Back 3

C. at least 1mm supragingivally.

Front 4

Improper temporary coverage of bridge
abutments can cause
A. increased tooth sensitivity.
B. gingival recession.
C. tooth migration.
D. occlusal prematurities.
E. All of the above.

Back 4

E. All of the above.

Front 5

During the fabrication of new complete
dentures, which of the following can be
modified to achieve the desired occlusion?
1. The compensating curve.
2. The orientation of the occlusal plane.
3. The cusp inclination.
4. The condylar inclination.

Back 5

1. The compensating curve.
2. The orientation of the occlusal plane.
3. The cusp inclination.

Front 6

At his first post insertion appointment, a
patient with a new removable partial
denture complains of a tender abutment
tooth. The most likely cause is
A. overextended borders of the partial.
B. inadequate polishing of the
framework.
C. improper path of insertion.
D. the occlusion.

Back 6

D. the occlusion.

Front 7

In the design of a removable partial
denture, guiding planes are made
A. parallel to the long axis of the tooth.
B. parallel to the path of insertion.
C. at a right angle to the occlusal plane.
D. at a right angle to the major
connector.

Back 7

B. parallel to the path of insertion.

Front 8

The purpose of a temporary restoration in
an anterior tooth is to
A. maintain aesthetics.
B. protect dentin and pulp.
C. prevent gingival inflammation and
recession.
D. prevent tooth movement.
E. All of the above.

Back 8

E. All of the above.

Front 9

Which of the following should be checked
first when a cast gold crown that fits on its
die cannot be seated on its abutment?
A. The occlusal contacts.
B. The taper of the preparation.
C. The proximal contacts.
D. The impression used to pour the cast.

Back 9

C. The proximal contacts.

Front 10

Alginate hydrocolloids
A. shrink when stored in air.
B. show syneresis.
C. expand when stored in water.
D. All of the above.

Back 10

D. All of the above.

Front 11

Silicone impression materials that set by
condensation polymerization
A. liberate ethyl alcohol as a byproduct
of the polymerization reaction.
B. polymerize more slowly.
C. undergo high shrinkage during the
first 24 hours.
D. contain an accelerator consisting of a
stannous sulfate.

Back 11

A. liberate ethyl alcohol as a byproduct
of the polymerization reaction.

Front 12

A facebow is used to record the
1. vertical dimension of occlusion.
2. inter-condylar distance.
3. horizontal condylar inclination.
4. relationship of the maxilla to the
hinge axis.

Back 12

2. inter-condylar distance.
4. relationship of the maxilla to the
hinge axis.

Front 13

Following the insertion of complete
dentures, a generalized soreness over the
entire mandibular alveolar ridge can be
caused by
A. Inadequate interocclusal distance.
B. impingement on the buccal frenum.
C. high muscle attachments.
D. excess border thickness.

Back 13

A. Inadequate interocclusal distance.

Front 14

Patients with new dentures should be
instructed to
1. clean dentures over a bowl of water.
2. hold dentures properly when cleaning.
3. correct minor soreness by filing
dentures.
4. persist with soreness for one week,
then return for an appointment.

Back 14

1. clean dentures over a bowl of water.
2. hold dentures properly when cleaning.

Front 15

Speech defects associated with a maxillary
partial denture can be caused by
1. replacing the teeth too soon after
extraction.
2. providing excessive bulk of denture
base.
3. positioning anterior teeth incorrectly.

Back 15

2. providing excessive bulk of denture
base.
3. positioning anterior teeth incorrectly.

Front 16

The major connector of a removable
partial denture should be designed to
A. connect rigidly the component parts
of the partial denture.
B. act as a stress-breaker.
C. dissipate vertical forces.
D. None of the above.

Back 16

A. connect rigidly the component parts
of the partial denture.

Front 17

A metal in the wrought condition differs
from the same metal in the cast condition
in that
A. the grains are deformed and
elongated.
B. the yield strength and hardness are
increased.
C. if heated sufficiently,
recrystallization can occur.
D. All of the above.

Back 17

D. All of the above.

Front 18

Dental porcelain has
1. low compressive strength.
2. high hardness.
3. high tensile strength.
4. low impact strength.

Back 18

2. high hardness.
4. low impact strength.

Front 19

In planning a bilateral distal extension
(free-end) mandibular removable partial
denture, the most important considerations
are
1. aesthetics.
2. stress distribution.
3. rigid clasping.
4. maximum tissue coverage.

Back 19

2. stress distribution.
4. maximum tissue coverage.

Front 20

Which of the following structures affects
the thickness of the flange of a maxillary
complete denture?
A. Malar process.
B. Coronoid process.
C. Mylohyoid ridge.
D. Zygomatic process.
E. Genial tubercle.

Back 20

B. Coronoid process.

Front 21

Upon examination of an edentulous
patient, it is observed that the tuberosities
contact the retromolar pads at the correct
occlusal vertical dimension. The treatment
of choice is to
A. reduce the retromolar pads surgically
to provide the necessary clearance.
B. reduce the tuberosities surgically to
provide the necessary clearance.
C. construct new dentures at an
increased occlusal vertical dimension
to gain the necessary clearance.
D. proceed with construction of the
denture and reduce the posterior
extension of the mandibular denture
to eliminate interferences.

Back 21

B. reduce the tuberosities surgically to
provide the necessary clearance.

Front 22

Which of the following problems of a
permanent fixed bridge, detected at the
delivery appointment, can be caused by an
inadequate temporary restoration?
1. Hypersensitivity of the abutments that
decreases after permanent luting.
2. Exposed gingival margins in an
esthetic area.
3. Contacts with adjacent teeth that
prevent complete seating of the
bridge.
4. Need for significant occlusal
adjustment.

Back 22

2. Exposed gingival margins in an
esthetic area.
4. Need for significant occlusal
adjustment.

Front 23

The use of a retraction cord impregnated
with 8 percent racemic epinephrine may
be hazardous for some patients because of
its
A. local caustic action on the gingival
tissue.
B. potential for systemic reaction.
C. local astringent action.
D. None of the above.

Back 23

B. potential for systemic reaction.

Front 24

Which of the following would occur if a
zinc containing amalgam is contaminated
with saliva during condensing?
1. No change in compressive strength
but lower tensile strength.
2. Increased expansion.
3. Reduced flow or creep.
4. Increased surface pitting.

Back 24

2. Increased expansion.
4. Increased surface pitting.

Front 25

Gold contributes which of the following
properties to a gold-copper alloy?
A. Corrosion resistance.
B. Increased strength.
C. Lowered specific gravity.
D. Increased hardness.

Back 25

A. Corrosion resistance.

Front 26

Gold casting alloys are classified as Type
I-IV according to which of the following
physical properties?
A. Percentage of gold present in the
alloy.
B. Surface hardness.
C. Melting point.
D. Elastic strength.
E. Ductility.

Back 26

B. Surface hardness.

Front 27

The interocclusal distance (freeway space)
A. is the difference between occlusal
vertical dimension and hinge-axis
registration.
B. is the difference between occlusal
vertical dimension and rest vertical
dimension.
C. is usually l0 mm in the premolar
region.
D. is the distance between centric
occlusion and centric relation.

Back 27

B. is the difference between occlusal
vertical dimension and rest vertical
dimension.

Front 28

Prior to cementing an onlay in a vital tooth
using polycarboxylate cement, the tooth
may be coated with cavity varnish
A. to protect the pulp.
B. to improve seal.
C. to prevent post-operative sensitivity.
D. None of the above.

Back 28

D. None of the above.

Front 29

In cementing a full crown, it is desirable to
A. retard the set of the cement.
B. apply continuous occlusal loading.
C. have excess cement covering the
margins.
D. All of the above.

Back 29

D. All of the above.

Front 30

A maxillary complete denture exhibits
more retention and stability than a
mandibular one because it
1. covers a greater area.
2. incorporates a posterior palatal seal.
3. is not subject to as much muscular
displacement.
4. is completely surrounded by soft
tissue.

Back 30

1. covers a greater area.
2. incorporates a posterior palatal seal.
3. is not subject to as much muscular
displacement.

Front 31

The purpose of relining a distal saddle of a
removable partial denture is to improve
1. tissue adaptation.
2. occlusion.
3. function.
4. fit of the framework.

Back 31

1. tissue adaptation.
2. occlusion.
3. function.

Front 32

The prime advantage of vacuum firing of
porcelain is
A. better colour.
B. less shrinkage.
C. more translucency.
D. increased strength.

Back 32

D. increased strength.

Front 33

After initial setting, a chemically cured
glass ionomer cement restoration should
have a coating agent applied to
A. hasten the final set.
B. protect the cement from moisture.
C. retard the final set.
D. protect the cement from ultraviolet
light.
E. create a smooth finish.

Back 33

B. protect the cement from moisture.

Front 34

Heat treatment alters a gold alloy's
A. hardness.
B. proportional limit.
C. percentage elongation.
D. All of the above.

Back 34

D. All of the above.

Front 35

In taking a polysulfide impression for a
cast restoration in the maxilla, the tray
must
1. be rigid.
2. have occlusal stops.
3. cover the hard palate.
4. be coated with an adhesive cement.

Back 35

1. be rigid.
2. have occlusal stops.
4. be coated with an adhesive cement.

Front 36

Immediately prior to cementation of a
fixed bridge, it is important to check
A. occlusal relationships.
B. firmness and location of contact
points.
C. pressure of pontics against soft
tissues.
D. All of the above.

Back 36

D. All of the above.

Front 37

To decrease abutment tooth sensitivity, a
fixed bridge may be temporarily seated
using
A. poly-carboxylate cement.
B. acrylic resin cement.
C. zinc-oxide-eugenol cement.
D. glass ionomer cement.

Back 37

C. zinc-oxide-eugenol cement.

Front 38

Which of the following is/are acceptable
technique(s) for displacing the gingival
tissue prior to taking an impression?
A. Displacement cords.
B. Electro-surgery.
C. Alum saturated cord.
D. Aluminum chloride impregnated
cord.
E. All of the above.

Back 38

E. All of the above.

Front 39

All things being equal, which of the
following pontic designs is the most likely
to cause soft tissue irritation?
A. Polished gold.
B. Polished acrylic.
C. Polished porcelain.
D. Glazed porcelain.

Back 39

B. Polished acrylic

Front 40

A circumferential clasp arm on a tooth is
one which
A. originates above the height of
contour.
B. approaches the undercut from an
occlusal direction.
C. traverses a portion of the suprabulge
of the tooth.
D. All of the above.

Back 40

D. All of the above.

Front 41

Impressions made with thiokol
(polysulfide) rubber may be
A. silver plated.
B. copper plated.
C. poured directly in die stone.
D. All of the above.

Back 41

D. All of the above.

Front 42

The location of a crown margin is
determined by
1. esthetic requirements.
2. clinical crown length.
3. presence of caries.
4. presence of an existing restoration.

Back 42

E. All of the above.

Front 43

Which of the following muscles has two
separate functions in mandibular
movement?
A. Masseter.
B. Geniohyoid.
C. External (lateral) pterygoid.
D. Buccinator.

Back 43

C. External (lateral) pterygoid.

Front 44

A lowering of serum calcium is the
stimulus for the endogenous release of
A. thyroid hormone.
B. adrenocortical hormone.
C. insulin.
D. parathyroid hormone.
E. adrenalin.

Back 44

D. parathyroid hormone.

Front 45

Dental plaque developing on tooth
surfaces will result in
A. demineralization of enamel.
B. periodontal disease.
C. amelogenesis imperfecta.
D. A. and B.

Back 45

D. A. and B.

Front 46

The microorganism most commonly
associated with root surface caries is
A. Actinomyces viscosus.
B. Streptococcus mutans.
C. Streptococcus salivarius.
D. Lactobacillus acidophilus.

Back 46

A. Actinomyces viscosus.

Front 47

Which of the following bacterial products
have been implicated in the initiation of
inflammatory periodontal disease?
1. Protease.
2. Hyaluronidase.
3. Neuraminidase.
4. Endotoxin.
5. Desxyribonuclease.

Back 47

1. Protease.
2. Hyaluronidase.
4. Endotoxin.

Front 48

In long-standing gingivitis, the
subgingival microflora shifts toward
A. aerobic bacteria.
B. Gram-positive bacteria.
C. Gram-negative anaerobic bacteria.
D. None of the above.

Back 48

C. Gram-negative anaerobic bacteria.

Front 49

Which of the following condition(s)
increase(s) susceptibility to dental caries?
1. Vitamin K deficiency during tooth
development.
2. Vitamin D deficiency during tooth
development.
3. Hereditary fructose intolerance.
4. Hyposalivation.

Back 49

2. Vitamin D deficiency during tooth
development.
4. Hyposalivation.

Front 50

Which of the following is the greatest risk
factor for rampant caries in children?
A. Frequent ingestion of
polysaccharides.
B. Frequent ingestion of high sucrosecontaining
foods.
C. Severe enamel hypoplasia.
D. Deficiency of vitamin D.

Back 50

B. Frequent ingestion of high sucrosecontaining
foods.