2010 Released Qs And Ans23

Front 1

A patient complains of the discolouration
of an upper central incisor.
Radiographically, the pulp chamber and
the root canal space are obliterated and the
periodontal ligament space appears
normal. The most appropriate treatment
would be to
A. perform root canal treatment and non
vital bleaching.
B. perform root canal treatment and
fabricate a post retained porcelain
fused to metal crown.
C. perform root canal treatment and
fabricate a porcelain veneer.
D. fabricate a porcelain fused to metal
crown.
E. fabricate a porcelain veneer.

Back 1

E. fabricate a porcelain veneer.

Front 2

Alteration of the intestinal flora by some
chemotherapeutic agents can interfere with
reabsorption of a contraceptive steroid
thus preventing the recirculation of the
drug through the enterohepatic circulation.
Which of the following can interfere with
this mechanism?
1. Codeine.
2. Penicillin V.
3. Acetaminophen
4. Tetracycline.

Back 2

2. Penicillin V.
4. Tetracycline.

Front 3

In an insulin dependent diabetic,
hypoglycemia is characterized by
1. mental confusion.
2. tachycardia.
3. sweating.
4. nausea.

Back 3

E. All of the above.

Front 4

The principles of closed fracture
management are
1. reduction of fracture.
2. immobilization of fracture.
3. restoration of occlusion.
4. incision and debridement at fracture
site.

Back 4

1. reduction of fracture.
2. immobilization of fracture.
3. restoration of occlusion.

Front 5

Displacement of fractures is influenced by
1. direction of the blow.
2. muscle attachments.
3. direction of fracture line.
4. hemorrhage.

Back 5

1. direction of the blow.
2. muscle attachments.
3. direction of fracture line.

Front 6

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

Back 6

1. Plasma cells.
2. Macrophages.
3. Lymphocytes.

Front 7

Which of the following anesthetic agents
is/are metabolized by plasma
cholinesterase?
1. Prilocaine (Citanest).
2. Lidocaine (Xylocaine).
3. Mepivicaine (Carbocaine).
4. Procaine (Novocain).

Back 7

4. Procaine (Novocain).

Front 8

In Angle's classification, a Class II,
division 1 malocclusion may describe a
combination of skeletal problems, such as
1. maxillary protrusion, normal
mandibular position.
2. normal maxillary position,
mandibular retrusion.
3. maxillary protrusion, mandibular
retrusion.
4. bimaxillary protrusion, with the
maxilla more protrusive than the
mandible.

Back 8

E. All of the above.

Front 9

The treatment of an ameloblastoma is
A. chemotherapy.
B. enucleation.
C. resection.
D. radiotherapy.

Back 9

C. resection.

Front 10

After initiating preventive management for
a 16 year old patient with multiple
extensive carious lesions, which of the
following restorative treatments is most
appropriate?
A. Place amalgam restorations over the
next few months.
B. Excavate caries and place temporary
restorations within the next few
weeks.
C. Delay any treatment until the hygiene
improves.
D. Restore all teeth with composite resin
over the next few months.

Back 10

B. Excavate caries and place temporary
restorations within the next few
weeks.

Front 11

Lidocaine (Xylocaine)
1. is a local anesthetic agent.
2. has topical anesthetic properties.
3. is an antiarrhythmic agent.
4. has anticonvulsant properties.

Back 11

E. All of the above.

Front 12

Most anaphylactic reactions to penicillin
occur
1. when the drug is administered
parenterally.
2. within minutes after drug
administration.
3. in patients who have already
experienced an allergic reaction to
the drug.
4. in patients with a negative skin test to
penicillin allergy.

Back 12

1. when the drug is administered
parenterally.
2. within minutes after drug
administration.
3. in patients who have already
experienced an allergic reaction to
the drug.

Front 13

Which of the following clinical conditions
is the most serious?
A. Acute periapical abscess of a
mandibular central incisor.
B. Middle face cellulitis.
C. Chronic periapical abscess of a
mandibular third molar.
D. Infected dentigerous cyst.

Back 13

B. Middle face cellulitis.

Front 14

Root resorption of permanent teeth may be
associated with
1. excessive orthodontic forces.
2. periapical granuloma.
3. traumatic injury.
4. cementoma.

Back 14

1. excessive orthodontic forces.
2. periapical granuloma.
3. traumatic injury.

Front 15

Which of the following are characteristics
of restorative glass ionomer cements?
1. Release of fluoride.
2. Bonding to enamel.
3. Setting is affected by moisture.
4. Irritating to pulpal tissues.

Back 15

1. Release of fluoride.
2. Bonding to enamel.
3. Setting is affected by moisture.

Front 16

A retrograde filling is indicated
A. when the apical foramen cannot be
sealed by conventional endodontics.
B. when a root perforation needs to be
sealed.
C. when conventional endodontics is
impossible due to calcified canals..
D. All of the above.

Back 16

D. All of the above.

Front 17

For a patient with cardiovascular disease,
local anesthesia
A. affects blood pressure more than
general anesthesia.
B. affects blood pressure less than
general anesthesia.
C. is responsible for bacteremia.
D. None of the above.

Back 17

B. affects blood pressure less than
general anesthesia.

Front 18

Vita shade A1
A. is more chromatic than A4.
B. has a different hue than A4.
C. has higher value than A4
D. has the same translucency as A4.

Back 18

C. has higher value than A4

Front 19

What ADA type die stone should be used
to pour dies for porcelain fused to metal
crowns when a polyvinylsiloxane
impression material is used?
A. Type IV.
B. Type III.
C. Type II.
D. Type I.

Back 19

A. Type IV.

Front 20

Xerostomia can be
1. found in the elderly.
2. drug induced.
3. associated with diabetes.
4. predisposing to dental diseases.

Back 20

E. All of the above.

Front 21

The primary stress bearing area of the
maxillary complete denture is the
A. hard palate.
B. alveolar ridge.
C. soft palate.
D. zygoma.

Back 21

B. alveolar ridge.

Front 22

Side effects of therapeutic doses of
codeine may produce
1. constipation.
2. drowsiness.
3. nausea.
4. respiratory depression.

Back 22

1. constipation.
2. drowsiness.
3. nausea.

Front 23

The primary retention of a Class II gold
inlay is achieved by
1. adding an occlusal dovetail.
2. increasing the parallelism of walls.
3. lengthening the axial walls.
4. placing a gingival bevel.

Back 23

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

Front 24

The tooth preparation for a porcelain
veneer must have a
1. rough surface.
2. space for the veneer material.
3. definite finish line.
4. margin at least 1mm supragingivally.

Back 24

2. space for the veneer material.
4. margin at least 1mm supragingivally.

Front 25

In an 80 year old patient you would expect
1. a reduced size of the pulp chamber.
2. increased incidence of pulp stones.
3. increased tendency to pulpal fibrosis.
4. an increased pulpal vascularity.

Back 25

1. a reduced size of the pulp chamber.
2. increased incidence of pulp stones.
3. increased tendency to pulpal fibrosis.

Front 26

Which of the following could cause
phonetic problems for patients with
removable dentures?
1. Posterior teeth placed in a buccal
position.
2. Excessive bulk in the palatal area.
3. Anterior teeth that are too long.
4. Bilaterally undercut ridges.

Back 26

1. Posterior teeth placed in a buccal
position.
2. Excessive bulk in the palatal area.
3. Anterior teeth that are too long.

Front 27

In order to achieve a proper interproximal
contact when using a spherical alloy,
which of the following is/are essential?
1. A larger sized condenser.
2. A thinner matrix band.
3. A properly placed wedge.
4. Use of mechanical condensation.

Back 27

1. A larger sized condenser.
2. A thinner matrix band.
3. A properly placed wedge.

Front 28

A bitewing radiograph of tooth 1.4 reveals
caries penetrating one third into the mesial
enamel. The correct management of tooth
1.4 is to
A. place an amalgam restoration.
B. place a porcelain inlay.
C. place a direct composite restoration.
D. apply fluoride and improve oral
hygiene.

Back 28

D. apply fluoride and improve oral
hygiene

Front 29

A patient with Alzheimer’s dementia
presents with his personal care worker.
His daughter, who is his legal guardian, is
unavailable. What is required to obtain
informed consent for an elective invasive
procedure?
A. The patient’s presence implies
consent.
B. Obtain written consent from the
patient.
C. Obtain written consent from the
personal care worker.
D. Obtain consent from the patient’s
daughter.

Back 29

D. Obtain consent from the patient’s
daughter.

Front 30

Enamel pearls form when
A. ameloblasts migrate apically down
the root.
B. cells of the epithelial root sheath do
not migrate away from the dentin.
C. cells of the dental follicle fail to
develop.
D. epithelial rests transform into
ameloblast vesicles.

Back 30

B. cells of the epithelial root sheath do
not migrate away from the dentin.

Front 31

Extrusion of the rubber stopper of a local
anesthetic cartridge is most likely caused
by
A. faulty manufacturing.
B. storage in a disinfectant solution.
C. exposure to excessive heat.
D. breakdown of the anesthetic solution.

Back 31

B. storage in a disinfectant solution.

Front 32

As a dentist in Canada, it is ethical to
refuse to treat a patient on the basis of
1. religious beliefs.
2. infectious disease.
3. physical handicap.
4. recognition of lack of skill or
knowledge.

Back 32

4. recognition of lack of skill or
knowledge.

Front 33

A vital canine is to be used as the anterior
abutment of a four unit fixed partial
denture and it has 2.0mm remaining
coronal tooth structure. The most
acceptable foundation restoration would
be
A. bonded amalgam core build-up.
B. a pin retained amalgam core buildup.
C. a pin retained composite resin core
build-up.
D. intentional devitalization followed by
a post and core restoration.

Back 33

D. intentional devitalization followed by
a post and core restoration.

Front 34

Hydrocolloid impressions are removed
from the mouth with a snap because they
exhibit
A. syneresis.
B. imbibition.
C. viscoelasticity.
D. low elastic recovery.
E. low tear strength.

Back 34

E. low tear strength.

Front 35

The desirable relationship between the
coefficients of thermal expansion of an
alloy (ε metal ) and a ceramic (εceramic) used
for a metallo-ceramic restoration is
A. ε metal significantly higher than
εceramic.
B. ε metal significantly lower than εceramic.
C. ε metal equal to εceramic.
D. ε metal slightly higher than εceramic.
E. ε metal slightly lower than εceramic.

Back 35

D. ε metal slightly higher than εceramic.

Front 36

Zinc oxide eugenol cement is a/an
A. phosphate cement.
B. phenolic cement.
C. resin modified glass ionomer cement.
D. polyalkenoic acid cement.
E. adhesive resin cement.

Back 36

B. phenolic cement.

Front 37

Light-cured dental composites set when
exposed to light. Light is the
A. initiator.
B. reactor.
C. catalyst.
D. activator.
E. terminator.

Back 37

D. activator.

Front 38

In alginate impression materials, sodium
phosphate (Na3PO4) is the
A. reactor.
B. catalyst.
C. retarder.
D. disinfectant.
E. cross linking agent.

Back 38

C. retarder.

Front 39

Xerostomia can result from
1. Sjögren’s syndrome.
2. radiation therapy for oral cancer.
3. antidepressant drug therapy.
4. anticholinergics (Atropine).

Back 39

E. All of the above.

Front 40

The roots of the first permanent molar
should be completely formed by the age of
A. six years.
B. seven years.
C. nine years.
D. eleven years.
E. thirteen years.

Back 40

D. eleven years.

Front 41

Which statement(s) is/are true about
diazepam?
1. It improves performance rating of
fine motor skills.
2. It is more toxic when taken with
ethyl alcohol.
3. It is available without prescription in
Canada.
4. It produces a typical dependence
syndrome.

Back 41

2. It is more toxic when taken with
ethyl alcohol.
4. It produces a typical dependence
syndrome.

Front 42

Which of the following is most likely to
displace the adjacent teeth?
A. Lateral periodontal cyst.
B. Dentigerous cyst.
C. Periapical cemental dysplasia.
D. Periapical abscess.
E. Radicular cyst.

Back 42

B. Dentigerous cyst.

Front 43

A white, diffuse, wrinkled appearance of
the buccal mucosa which diminishes in
prominence or disappears upon stretching
is indicative of
A. leukoedema.
B. lichen planus.
C. candidiasis.
D. linea alba.
E. white sponge nevus.

Back 43

A. leukoedema.

Front 44

A properly designed pontic should
A. stabilize opposing teeth.
B. protect abutment teeth through its
flexibility.
C. completely occupy the space of the
extracted tooth.
D. provide for visual inspection of the
margins of the retainers.

Back 44

A. stabilize opposing teeth.

Front 45

A vital canine is to be used as the anterior
abutment of a 4 unit fixed partial denture
and it has 2mm of remaining coronal tooth
structure. The most acceptable foundation
restoration would be
A. a bonded amalgam.
B. a pin retained amalgam core buildup.
C. a pin retained composite resin core
build-up.
D. intentional devitalization followed by
a post and core restoration.

Back 45

D. intentional devitalization followed by
a post and core restoration.

Front 46

A patient's 4 mandibular incisors were
traumatized 3 years ago in an accident.
Radiographs now show apical
radiolucencies associated with all 4 teeth.
The recommended treatment is to
A. test the pulp vitality and perform root
canal therapy on teeth with no
response.
B. perform root canal therapy and
curette the area.
C. extract and place a bonded bridge.
D. postpone treatment and recheck
status periodically.

Back 46

A. test the pulp vitality and perform root
canal therapy on teeth with no
response.

Front 47

A clinical sign of unilateral fracture of the
body of the zygoma is
A. cerebrospinal rhinorrhea.
B. impaired hearing.
C. subconjunctival haemorrhage.
D. otorrhea.

Back 47

C. subconjunctival haemorrhage.

Front 48

A 55 year old female patient complains of
dry, burning mouth. The clinical and
radiological examination shows
xerostomia, periodontitis, multiple caries,
periapical abscesses and candidiasis.
What is the most likely diagnosis?
A. AIDS.
B. Diabetes mellitus.
C. Multiple myeloma.
D. Leukemia.

Back 48

B. Diabetes mellitus.

Front 49

The dimensional stability of polyether
impression material is considered to be
good EXCEPT if the material is
A. dehydrated.
B. allowed to absorb water after setting.
C. distorted by rapid removal of the
impression from the mouth.
D. contaminated with latex.

Back 49

B. allowed to absorb water after setting.

Front 50

For prevention of cross infection, which of
the following impression materials can be
treated with a disinfecting spray
solution/agent?
A. Irreversible hydrocolloid (alginate).
B. Polyether.
C. Polysulfide.
D. Polysiloxane.
E. All of the above.

Back 50

E. All of the above.