2010 Released Qs And Ans28

Front 1

A patient presents with pain from tooth 4.7
which is an abutment for a 4 unit bridge
from 4.4 to 4.7. Clinical and radiographic
examinations reveal tooth 4.7 has
extensive distal caries and apical rarefying
osteitis. The most appropriate initial
management is to
A. prescribe an antibiotic and an
analgesic and reappoint the patient.
B. perform endodontic therapy through
the 4.7 crown.
C. section the bridge at 4.4, remove 4.7
crown and assess 4.7.
D. remove entire bridge and assess
restorability of abutments.

Back 1

C. section the bridge at 4.4, remove 4.7
crown and assess 4.7.

Front 2

Post-immunization serological test results
for a health care worker who has
completed the series of vaccinations
against hepatitis B reveals that their anti-
HBsAg is less than the value required for
immunity. The health care worker should
A. receive one additional vaccination
followed by post-immunization
testing.
B. repeat the full series of hepatitis B
vaccinations followed by postimmunization
testing.
C. refrain from performing any
exposure-prone procedures for a
period of 3-6 months followed by a
full series of hepatitis B vaccinations.
D. have liver function tests performed to
assess liver damage from a previous
hepatitis B infection.

Back 2

B. repeat the full series of hepatitis B
vaccinations followed by postimmunization
testing.

Front 3

When using forceps to extract a maxillary
first molar, the forceps movement should
be principally in the buccal direction
because the
A. buccal bone is thinner than the
palatal bone.
B. buccal roots are shorter than palatal
root.
C. risk for sinus perforation is
minimized.
D. furcation is more accessible from the
buccal.

Back 3

A. buccal bone is thinner than the
palatal bone.

Front 4

Which of the following may be used to
disinfect gutta-percha points?
A. Glass bead sterilizer.
B. Autoclave.
C. Chemical solutions.
D. Flame sterilization.
E. Dry heat sterilization.

Back 4

C. Chemical solutions.

Front 5

Endodontic therapy is
CONTRAINDICATED in teeth with
A. inadequate periodontal support.
B. pulp stones.
C. constricted root canals.
D. accessory canals.
E. curved roots.

Back 5

A. inadequate periodontal support.

Front 6

The pulpal floor of an occlusal amalgam
preparation on a mandibular first premolar
should
A. be 2mm into the dentin.
B. slope apically from mesial to distal.
C. be parallel to the buccolingual cusp
plane.
D. be perpendicular to the long axis of
the tooth.

Back 6

C. be parallel to the buccolingual cusp
plane.

Front 7

A patient telephones and tells you he has
just knocked out his front tooth but that it
is still intact. Your instructions should be
to
A. put the tooth in water and come to
your office at the end of the day.
B. wrap the tooth in tissue and come to
your office in a week's time.
C. put the tooth in alcohol and come to
your office immediately.
D. place tooth under the tongue and
come to your office immediately.
E. place the tooth in milk and come to
your office immediately.

Back 7

E. place the tooth in milk and come to
your office immediately.

Front 8

The placement of a retentive pin in the
proximal regions of posterior teeth would
MOST likely result in periodontal
ligament perforation in the
A. mesial of a mandibular first
premolar.
B. distal of a mandibular first premolar.
C. distal of a mandibular first molar.
D. mesial of a mandibular first molar

Back 8

C. distal of a mandibular first molar.

Front 9

For a cast gold restoration, a gingival
bevel is used instead of a shoulder because
a bevel
1. protects the enamel.
2. increases retention.
3. improves marginal adaptation.
4. increases the thickness of gold.

Back 9

1. protects the enamel.
3. improves marginal adaptation.

Front 10

Firm contact between approximating teeth
is important because it
A. locates the marginal ridges of each
tooth.
B. keeps the teeth from having any
movement during function.
C. insures proper cusp form and
increases masticatory efficiency.
D. stabilizes the dental arches and gives
protection to the gingival papillae.

Back 10

D. stabilizes the dental arches and gives
protection to the gingival papillae.

Front 11

A rubber dam should be used in
A. pulp capping procedures.
B. amalgam placement.
C. composite placement.
D. removing carious dentin from deep
lesions.
E. all of the above.

Back 11

E. all of the above.

Front 12

The air-water spray used as a coolant in
high speed cutting of a cavity will
1. decrease pulp damage.
2. reduce frictional heat.
3. keep the operating site clean.
4. reduce clogging of cutting
instruments.

Back 12

E. All of the above.

Front 13

During matrix placement for a Class II
cavity preparation, a wedge is placed to
1. separate the teeth.
2. adapt the matrix to the gingival
margin.
3. aid in the creation of a contact.
4. absorb moisture.

Back 13

1. separate the teeth.
2. adapt the matrix to the gingival
margin.
3. aid in the creation of a contact.

Front 14

Microbial virulence factors
A. are produced by non-pathogenic
microbes.
B. are always pathogenic.
C. include exotoxins, capsules,
endotoxins and enzymes.
D. are caused only by Gram-positive
microbes.

Back 14

C. include exotoxins, capsules,
endotoxins and enzymes.

Front 15

Pulpotomy is the treatment of choice in
pulp exposures of asymptomatic vital teeth
with incompletely formed apices. Pulp
capping is the recommended procedure for
carious exposures on primary teeth.
A. The first statement is true, the second
false.
B. The first statement is false, the
second true.
C. Both statements are true.
D. Both statements are false.

Back 15

A. The first statement is true, the second
false.

Front 16

A patient has suffered a blow resulting in
the loosening of three maxillary incisors.
Vitality tests give negative readings. The
most appropriate management would be to
A. perform pulpectomies on the teeth.
B. remove the teeth, fill the root canals
and replant.
C. splint the teeth, check vitality in one
month and if negative, treat
endodontically.
D. splint the teeth and treat
endodontically immediately.

Back 16

C. splint the teeth, check vitality in one
month and if negative, treat
endodontically.

Front 17

For composite resin preparations,
cavosurface enamel margins are bevelled
because
1. a bevelled margin produces a more
favorable surface for etching.
2. a bevelled margin improves the edge
strength of the composite resin.
3. after etching, the bonding agent
reduces microleakage.
4. the procedure eliminates the need to
polish the restoration.

Back 17

1. a bevelled margin produces a more
favorable surface for etching.
3. after etching, the bonding agent
reduces microleakage.

Front 18

Retention of a gold inlay is improved by
1. addition of an occlusal dovetail.
2. increasing the parallelism of walls.
3. lengthening the axial walls.
4. placing a gingival bevel.

Back 18

1. addition of an occlusal dovetail.
2. increasing the parallelism of walls.
3. lengthening the axial walls.

Front 19

If a complete occlusal adjustment is
necessary, interferences should be
corrected
A. after all restorative procedures are
completed.
B. at the time of each restorative
procedure.
C. before starting any restorative
treatment.
D. during treatment.

Back 19

C. before starting any restorative
treatment.

Front 20

Pulpal response to cavity preparation
depends upon
1. remaining dentin thickness.
2. coolant used while cutting.
3. sharpness of the bur.
4. duration of the operation.

Back 20

D. All of the above.

Front 21

When using ultra high speed cutting
instruments for cavity preparation, the heat
generated is directly related to the
1. duration of cutting.
2. size, speed and sharpness of the bur.
3. use of air and water spray.
4. existing pulp pathology.

Back 21

1. duration of cutting.
2. size, speed and sharpness of the bur.
3. use of air and water spray.

Front 22

Which of the following instruments can be
used for placing gingival bevels on inlay
preparations?
1. Margin trimmers.
2. Enamel hatchets.
3. Carbide finishing burs.
4. Small diamond disks.

Back 22

1. Margin trimmers.
3. Carbide finishing burs.

Front 23

In restoring occlusal anatomy, the
protrusive condylar path inclination has its
primary influence on the morphology of
A. cusp height.
B. anterior teeth only.
C. mesial inclines of maxillary cusps
and distal inclines of mandibular
cusps.
D. mesial inclines of mandibular cusps
and distal inclines of maxillary
cusps.

Back 23

D. mesial inclines of mandibular cusps
and distal inclines of maxillary
cusps.

Front 24

A lingual approach for a conservative
Class III preparation for a composite resin
requires
A. a retentive internal form.
B. parallelism of the incisal and gingival
walls.
C. maintenance of the incisal contact
area.
D. All of the above.

Back 24

D. All of the above.

Front 25

Sterilization of carious dentin without pulp
injury is assured by the application of
A. phenol.
B. 70% ethyl alcohol.
C. chlorhexidine.
D. absolute alcohol.
E. None of the above.

Back 25

E. None of the above.

Front 26

In composite resin restorations,
polycarboxylate cements are used as a
base because they are
A. sedative to a hyperemic pulp.
B. neutral in colour.
C. biocompatible.
D. None of the above.

Back 26

D. None of the above.

Front 27

Accessory canals in permanent teeth are
most commonly found in the
A. cervical third of the root.
B. middle third of the root.
C. apical third of the root.
D. bifurcation area.
E. trifurcation area.

Back 27

C. apical third of the root.

Front 28

Severe throbbing tooth pain which
increases when the patient lies down is a
symptom of
A. a pulp polyp (chronic hyperplastic
pulpitis).
B. late stage of acute pulpitis (acute
suppurative pulpitis).
C. chronic pulpitis (chronic ulcerative
pulpitis).
D. chronic apical abscess.
E. pulp hyperemia.

Back 28

B. late stage of acute pulpitis (acute
suppurative pulpitis).

Front 29

What clinical evidence would support a
diagnosis of acute dento-alveolar abscess?
1. A negative reaction to the electric
vitality tester.
2. A positive reaction of short duration
to cold.
3. A positive reaction to percussion.
4. Presence of a draining fistula.

Back 29

1. A negative reaction to the electric
vitality tester.
3. A positive reaction to percussion.

Front 30

Which of the following microorganisms
are most frequently found in infected root
canals?
A. Streptococcus viridans.
B. Staphylococcus aureus.
C. Lactobacilli.
D. Enterococci.
E. Staphylococcus albus.

Back 30

D. Enterococci.

Front 31

Following the removal of a vital pulp, the
root canal is medicated and sealed. The
patient returns with apical periodontitis.
The most common cause is
A. overinstrumentation.
B. lateral perforation.
C. incorrect medication.
D. pulp tissue left in the root canal.
E. infection.

Back 31

A. overinstrumentation.

Front 32

Odontoblast nuclei displacement into
adjacent dentinal tubuli is thought to be
1. a reversible pathologic condition.
2. due to increased intrapulpal tissue
pressure.
3. due to contraction of collagen fibres.
4. more frequent following the use of
air coolant rather than water coolant.
5. one of the first histological changes
following operative trauma.

Back 32

E. All of the above.

Front 33

In the mandibular first premolar, the
occlusal dovetail of an ideal disto-occlusal
amalgam preparation is usually not
extended into the mesial fossa because of
the
A. small lingual lobe.
B. large buccal cusp.
C. large buccal pulp horn.
D. prominent transverse ridge.

Back 33

D. prominent transverse ridge.

Front 34

A zinc oxide and eugenol cement placed
beneath a metallic restoration serves as a
1. thermal insulator.
2. electrical insulator.
3. cavosurface margin seal.
4. medicinal benefit to the pulp.

Back 34

1. thermal insulator.
2. electrical insulator.
4. medicinal benefit to the pulp.

Front 35

Prior to the placement of polycarboxylate
cement as a base for a restoration, the
cavity preparation should be
A. painted with cavity varnish.
B. cleaned with hydrofluoric acid.
C. thoroughly dried with warm air.
D. cleaned with water and air dried.

Back 35

D. cleaned with water and air dried.

Front 36

When odontoblasts are destroyed or
undergo degeneration, they are replaced
by
A. ameloblasts.
B. undifferentiated mesenchymal cells.
C. multinucleated giant cells.
D. osteoblasts.

Back 36

B. undifferentiated mesenchymal cells.

Front 37

Aging of the pulp is evidenced by a
relative increase in
1. vascularity.
2. nerve tissue.
3. cell numbers.
4. fibrous elements.
5. calcification.

Back 37

4. fibrous elements.
5. calcification.

Front 38

In teeth with complete pulp necrosis, the
periapical area is involved if
1. there is pain to thermal stimuli.
2. there is pain on percussion.
3. the tooth throbs when the patient is
lying down.
4. the radiograph shows an apical
radiolucency.

Back 38

2. there is pain on percussion.
4. the radiograph shows an apical
radiolucency.

Front 39

Which of the following cells are
characteristic of chronic inflammation of
the dental pulp?
1. Neutrophils.
2. Eosinophils.
3. Lymphocytes.
4. Macrophages.
5. Plasma cells.

Back 39

3. Lymphocytes.
4. Macrophages.
5. Plasma cells.

Front 40

The masseter muscle originates from the
A. angle of the mandible.
B. coronoid process.
C. pterygoid fossa.
D. zygomatic arch.

Back 40

D. zygomatic arch.

Front 41

The physiologic rest position of the
mandible is
1. a position determined by the
musculature.
2. a fairly constant position throughout
life.
3. used in determining occlusal vertical
dimension.
4. used when making a centric
interocclusal record.

Back 41

1. a position determined by the
musculature.
2. a fairly constant position throughout
life.
3. used in determining occlusal vertical
dimension.

Front 42

Which of the following muscles comprise
the retromolar pad?
1. Lateral (external) pterygoid.
2. Buccinator.
3. Palatoglossus.
4. Superior constrictor.

Back 42

2. Buccinator.
4. Superior constrictor.

Front 43

The success of indirect pulp capping is
dependent upon
A. removal of all caries at the enameldentin
junction.
B. use of calcium hydroxide.
C. a well sealed restoration.
D. All of the above.

Back 43

D. All of the above.

Front 44

A tooth with a mild pulpitis should be
sedated with
A. polycarboxylate cement.
B. composite resin.
C. silicophosphate cement.
D. zinc-oxide-eugenol cement.

Back 44

D. zinc-oxide-eugenol cement.

Front 45

Polycarboxylate cement may be used as a
base material beneath a metallic
restoration because
A. its thermal conductivity is similar to
dentin and enamel.
B. its thermal diffusivity is similar to
dentin and enamel.
C. its compressive strength when set
will resist forces of condensation.
D. All of the above.

Back 45

D. All of the above.

Front 46

The most important principle dictating
location and size of access to the root
canal system is
A. preservation of tooth structure.
B. removal of all caries.
C. straight line access to the canal.
D. removal of all pulp horns.

Back 46

C. straight line access to the canal.

Front 47

Function(s) of the dental pulp include(s)
1. defensive.
2. sensory.
3. circulatory.
4. dentin repair.

Back 47

E. All of the above.

Front 48

A loss of sensation in the lower lip may be
produced by
1. Bell's palsy.
2. metastatic malignancy to the body of
the mandible.
3. trigeminal neuralgia.
4. fracture in the mandibular first molar
region.

Back 48

2. metastatic malignancy to the body of
the mandible.
4. fracture in the mandibular first molar
region.

Front 49

Which of the following nerves should be
anesthetized for extraction of a maxillary
lateral incisor?
1. Nasociliary.
2. Nasopalatine.
3. Sphenopalatine.
4. Anterior superior alveolar.

Back 49

2. Nasopalatine.
4. Anterior superior alveolar

Front 50

Extraction of a tooth is
CONTRAINDICATED in the dental
office for a patient who
1. had a myocardial infarct two months
ago.
2. is hypothyroid.
3. has a Factor VIII deficiency.
4. is 4 months pregnant.

Back 50

1. had a myocardial infarct two months
ago.
3. has a Factor VIII deficiency.