2010 Released Qs And Ans14

Front 1

Biologic damage produced by ionizing
radiation results from
A. interference with mitotic activity of
cells.
B. direct interactions.
C. free radicals.
D. All of the above.

Back 1

D. All of the above.

Front 2

In X-ray equipment, kilovoltage controls
1. contrast.
2. speed of electrons.
3. amount of radiation produced.
4. penetrating power of radiation.
5. temperature of the cathode filament.

Back 2

1. contrast.
2. speed of electrons.
4. penetrating power of radiation.

Front 3

Which of the following should be done
prior to pin hole placement in an extensive
amalgam preparation?
1. Examine the radiograph.
2. Determine the subgingival anatomic
contours.
3. Remove caries and unsupported
enamel.
4. Place a pilot hole at the dentinoenamel
junction.

Back 3

1. Examine the radiograph.
2. Determine the subgingival anatomic
contours.
3. Remove caries and unsupported
enamel.

Front 4

Cytologic examination may aid in the
diagnosis of
1. Herpes simplex.
2. Recurrent aphthae.
3. Pemphigus vulgaris.
4. Erosive lichen planus.
5. Carcinoma in situ.

Back 4

1. Herpes simplex.
3. Pemphigus vulgaris.
4. Erosive lichen planus.

Front 5

A patient has a smooth, red, protruding
lesion at the tip of the tongue. Microscopic
examination reveals a stratified squamous
epithelium covering loose, fibrous
connective tissue with many thin-walled,
vascular spaces. The diagnosis is
A. fibroma.
B. papilloma.
C. hemangioma.
D. pleomorphic adenoma.
E. granular cell tumor (myoblastoma).

Back 5

C. hemangioma.

Front 6

Using pins to retain amalgam restorations
increases the risk of
1. cracks in the teeth.
2. pulp exposures.
3. thermal sensitivity.
4. periodontal ligament invasion.

Back 6

E. All of the above.

Front 7

In pin-retained restorations, the pin holes
should be parallel to the
A. long axis of the tooth.
B. nearest external surface.
C. pulp chamber.
D. axial wall.

Back 7

B. nearest external surface.

Front 8

What is the most important factor to
consider when deciding whether or not to
use pulp protection?
A. depth of the pulpal floor.
B. thickness of the remaining dentin.
C. amount of carious material removed.
D. location of the carious lesion.

Back 8

B. thickness of the remaining dentin.

Front 9

Enlargement of the thyroid gland can be
caused by
A. insufficient fluoride.
B. excess iodine.
C. insufficient iodine.
D. excess calcium.
E. excess sodium.

Back 9

C. insufficient iodine.

Front 10

The principal reason for a cavosurface
bevel on an inlay preparation is to
A. remove undermined enamel.
B. improve marginal adaptation.
C. decrease marginal percolation.
D. increase resistance and retention
forms.

Back 10

B. improve marginal adaptation.

Front 11

Which of the following conditions is
characterized by abnormally large pulp
chambers?
A. Amelogenesis imperfecta.
B. Regional odontodysplasia.
C. Dentinogenesis imperfecta.
D. Dentinal dysplasia Type I.

Back 11

B. Regional odontodysplasia.

Front 12

A positive pulp response to the application
of cold indicates
A. necrosis.
B. periodontal involvement.
C. an acute alveolar abscess.
D. a periodontal abscess.
E. vitality.

Back 12

E. vitality.

Front 13

Which of the following has the highest
rate of recurrence?
A. Odontogenic keratocyst.
B. Nasoalveolar cyst.
C. Median palatal cyst.
D. Incisive canal cyst.

Back 13

A. Odontogenic keratocyst.

Front 14

Which of the following tumors may arise
in the parotid salivary gland?
1. Mixed tumor.
2. Adenocarcinoma.
3. Warthin's tumor.
4. Mucoepidermoid tumor.

Back 14

E. All of the above.

Front 15

Which of the following is the most
frequent cause of ankylosis of the
temporomandibular joint?
A. Intra-articular injection of steroids.
B. Chronic subluxation.
C. Trauma.
D. Anterior disc dislocation

Back 15

C. Trauma.

Front 16

The most likely origin of a metastic
carcinoma of the mandible is a primary
lesion of the
1. lung.
2. breast.
3. prostate.
4. nasopharynx.

Back 16

1. lung.
2. breast.
3. prostate

Front 17

Which of the following is/are
characterized by an obliteration of pulp
chambers and root canals?
1. Ageing.
2. Chronic trauma.
3. Dentinal dysplasia.
4. Taurodontism.

Back 17

1. Ageing.
2. Chronic trauma.
3. Dentinal dysplasia.

Front 18

Hyperplastic lingual tonsils may resemble
which of the following?
A. Epulis fissuratum.
B. Lingual varicosities.
C. Squamous cell carcinoma.
D. Median rhomboid glossitis.
E. Prominent fungiform papillae.

Back 18

C. Squamous cell carcinoma.

Front 19

In the bisecting angle principle of intraoral
radiography, the radiopacity that can
obliterate the apices of maxillary molars is
the
A. maxillary sinus.
B. palatine bone and the zygoma.
C. orbital process of the zygomatic
bone.
D. zygoma and the zygomatic process of
the maxilla.

Back 19

D. zygoma and the zygomatic process of
the maxilla.

Front 20

Radiographically, the lamina dura is a
A. thick layer of bone forming the inner
surface of the alveolus.
B. thin radiolucent line around the roots
of the teeth.
C. thick layer of cortical bone.
D. thin radiopaque line around the roots
of the teeth.

Back 20

D. thin radiopaque line around the roots
of the teeth.

Front 21

A 60-year old patient requests the
replacement of tooth 4.6, which was
extracted many years ago. Tooth 1.6 has
extruded 1.8mm into the space of the
missing tooth. The three unit fixed bridge
replacing the mandibular first molar
should be fabricated
A. to the existing occlusion.
B. after extracting tooth 1.6 and
replacing it with a fixed partial
denture.
C. after restoring tooth 1.6 to a more
normal plane of occlusion.
D. after devitalizing and preparing tooth
1.6 for a cast crown.

Back 21

C. after restoring tooth 1.6 to a more
normal plane of occlusion.

Front 22

A tilted molar can be used as a fixed
partial denture abutment if
1. it undergoes orthodontic uprighting
first.
2. a coping and telescopic crown are
used on the abutment.
3. a non-rigid connector is placed in the
fixed partial denture.
4. its long axis is within 25° of the long
axis of the other abutments.

Back 22

E. All of the above.

Front 23

The anatomical landmarks used to help
establish the location of the posterior
palatal seal of a maxillary complete
denture include the
A. pterygomaxillary notches and the
fovea palatinae.
B. pterygomaxillary notches and the
posterior nasal spine.
C. posterior border of the tuberosities
and the posterior border of the
palatine bone.
D. anterior border of the tuberosities,
the palatine raphe and the posterior
border of the palatine bone.

Back 23

C. posterior border of the tuberosities
and the posterior border of the
palatine bone.

Front 24

Gingivitis is characterized by
A. bleeding on gentle probing of the
gingival sulcus.
B. swollen marginal gingiva.
C. alveolar bone loss.
D. apical migration of the junctional
epithelium

Back 24

A. bleeding on gentle probing of the
gingival sulcus.
B. swollen marginal gingiva.

Front 25

Which of the following is/are clinical
signs of gingivitis?
1. Loss of stippling.
2. Gingival hyperplasia.
3. Bleeding on probing.
4. Increased probing depth.

Back 25

1. Loss of stippling.
2. Gingival hyperplasia.
3. Bleeding on probing.

Front 26

Irreversible hydrocolloid materials are best
removed from the mouth by
A. a quick snap.
B. a slow teasing motion.
C. twisting and rocking.
D. having the patient create a positive
pressure.

Back 26

A. a quick snap.

Front 27

To improve denture stability, mandibular
molar teeth should normally be placed
A. over the crest of the mandibular
ridge.
B. buccal to the crest of the mandibular
ridge.
C. over the buccal shelf area.
D. lingual to the crest of the mandibular
ridge.

Back 27

B. buccal to the crest of the mandibular
ridge.

Front 28

Dislodgement of a maxillary denture may
be caused by
A. underextension.
B. improper occlusion.
C. overextension.
D. All of the above.

Back 28

D. All of the above.

Front 29

Upon setting, a mixture of plaster of Paris
and water will exhibit
A. loss in compressive strength.
B. expansion.
C. gain in moisture content.
D. contraction.

Back 29

B. expansion.

Front 30

High copper amalgam alloys are superior
to conventional alloys in that they have
1. lower creep.
2. less corrosion.
3. less marginal breakdown.
4. higher 1 hour compressive strength.

Back 30

E. All of the above.

Front 31

Extreme resorption of an edentulous
mandible can bring the alveolar ridge to
the level of the attachment of the
A. buccinator, styloglossus and
geniohyoid muscles.
B. mylohyoid, buccinator and
styloglossus muscles.
C. superior constrictor, mylohyoid and
buccinator muscles.
D. mylohyoid, buccinator and
genioglossus muscles.

Back 31

D. mylohyoid, buccinator and
genioglossus muscles.

Front 32

Subgingival calculus differs from
supragingival calculus in that it
A. does not have a definite predelection
for a specific site or sites.
B. may form only after the adjacent
gingiva has become inflamed.
C. may take longer to form.
D. All of the above.

Back 32

D. All of the above.

Front 33

Habitual thumbsucking continued after the
age of six causes
A. anterior open bite.
B. skeletal malocclusion.
C. mouth breathing.
D. sinusitis.

Back 33

A. anterior open bite.

Front 34

Problems arising from impacted teeth
include
A. infection.
B. pain.
C. predisposition to fracture.
D. All of the above.

Back 34

D. All of the above.

Front 35

In the maxilla, which of the following
teeth may drain through the palatal plate
of bone and present as a palatal abscess?
1. Second incisors.
2. First premolars.
3. First molars.
4. First incisors.
5. Third molars.

Back 35

1. Second incisors.
3. First molars.

Front 36

The absence of a pulp chamber in a
deciduous maxillary incisor is most likely
due to
A. amelogenesis imperfecta.
B. hypophosphatasia.
C. trauma.
D. ectodermal dysplasia.
E. cleidocranial dysostosis.

Back 36

C. trauma.

Front 37

Permanent first molars begin calcification
at
A. 1 to 4 months in utero.
B. birth.
C. 3 to 6 months.
D. 7 to 11 months.
E. 12 to 15 months.

Back 37

B. birth.

Front 38

In patients with cleft palates there may be
A. an increase in supernumerary teeth.
B. an increase in congenitally missing
teeth.
C. a higher incidence of crown defects.
D. All of the above.

Back 38

D. All of the above.

Front 39

Which of the following will produce
hemostasis when applied topically?
A. Oxidized cellulose.
B. Absorbable gelatin sponge.
C. Microfibrillar collagen.
D. Topical bovine thrombin.
E. All of the above.

Back 39

E. All of the above.

Front 40

Which of the following drugs is(are) used
to suppress pain?
1. Benzodiazepines.
2. Barbiturates.
3. Narcotic analgesics.

Back 40

3. Narcotic analgesics.

Front 41

Before performing surgery on a patient
who is taking warfarin, which of the
following should be evaluated?
A. Bleeding time.
B. Clotting time.
C. Prothrombin time.
D. Coagulation time

Back 41

C. Prothrombin time.

Front 42

Which of the following statements is
correct?
A. Epithelial cells are united to the basal
lamina by hemidesmosomes.
B. The basal lamina is divided into
lamina lucida and lamina densa.
C. The basal lamina is a product of
epithelial cells.
D. All of the above.

Back 42

D. All of the above.

Front 43

Normal sulcular epithelium in man is
1. nonkeratinized.
2. squamous.
3. stratified.
4. nonpermeable.

Back 43

1. nonkeratinized.
2. squamous.
3. stratified.

Front 44

The arrangement and character of the
principal fibres of the periodontal ligament
are modified by
A. tooth morphology.
B. occlusal function.
C. cementum.
D. alveolar bone.

Back 44

B. occlusal function.

Front 45

Hypoglycemia is characterized by
1. mental confusion.
2. tachycardia.
3. sweating.
4. nausea.

Back 45

E. All of the above.

Front 46

Juvenile periodontitis
A. is associated with gram-negative
anaerobic flora.
B. is associated with gram-positive
anaerobic flora.
C. is associated with root caries.
D. has a definite predilection toward
males.

Back 46

A. is associated with gram-negative
anaerobic flora.

Front 47

Gingival inflammation may result from
A. trauma.
B. chemical irritation.
C. plaque.
D. All of the above.

Back 47

D. All of the above.

Front 48

Endotoxin is
A. a cell wall component of gramnegative
bacteria.
B. a potent inflammatory agent.
C. present in diseased root cementum.
D. All of the above.

Back 48

D. All of the above.

Front 49

A 70-year old female has consumed
optimal levels of fluorides all her life. You
would expect to find a decreased incidence
of
1. Paget's disease of bone.
2. osteoporosis.
3. hyperparathyroidism.
4. dental caries.

Back 49

2. osteoporosis.
4. dental caries.

Front 50

The lowest level of fluoride in drinking
water which will cause enamel mottling is
A. 0.5ppm.
B. 1.0ppm.
C. 3.0ppm.
D. 5.0ppm.

Back 50

B. 1.0ppm.