2010 Released Qs And Ans31

Front 1

An acute periapical abscess originating
from a mandibular third molar generally
points and drains in the
A. submandibular space.
B. pterygomandibular space.
C. buccal vestibule.
D. buccal space.

Back 1

A. submandibular space.

Front 2

When sutures are used to reposition tissue
over extraction sites, they should be
1. placed over firm bone where
possible.
2. interrupted, 15mm apart.
3. firm enough to approximate tissue
flaps without blanching.
4. tight enough to produce immediate
hemostasis.

Back 2

1. placed over firm bone where
possible.
3. firm enough to approximate tissue
flaps without blanching.

Front 3

What is the maximum number of
cartridges (1.8ml) of a 2 local anesthetic
solution that can be administered without
exceeding a total dose of 300mg?
A. 2
B. 4
C. 6
D. 8
E. 10

Back 3

D. 8

Front 4

After an inferior alveolar nerve block
injection, a patient would develop seventh
nerve paralysis if the injection was made
into the
A. internal maxillary artery.
B. retroparotid space.
C. internal pterygoid muscle.
D. retromandibular vein.
E. pterygoid plexus of veins.

Back 4

B. retroparotid space.

Front 5

In primary molars, radiographic bony
changes from an infection are initially
seen
A. at the apices.
B. in the furcation area.
C. at the alveolar crest.
D. at the base of the developing tooth.

Back 5

B. in the furcation area.

Front 6

An ankylosed deciduous molar can cause
A. delayed eruption of the succeeding
premolar.
B. alteration of arch length.
C. difficulty with extraction.
D. All of the above.

Back 6

D. All of the above.

Front 7

The eruption of a permanent central
incisor may be delayed by
A. a supernumerary tooth.
B. dense fibrous tissue.
C. a retained deciduous incisor.
D. All of the above.

Back 7

D. All of the above.

Front 8

The highest incidence of congenitally
missing lateral incisors is most likely seen
in a patient with
A. unilateral cleft lip and palate.
B. congenital heart disease.
C. Down's syndrome.
D. hyperthyroidism.

Back 8

A. unilateral cleft lip and palate.

Front 9

A radiographic examination of a 10 year
old child reveals retention of deciduous
teeth and presence of many unerupted
supernumerary teeth. This is characteristic
of
A. cleidocranial dysplasia.
B. ectodermal dysplasia.
C. dentinogenesis imperfecta.
D. congenital hypothyroidism.

Back 9

A. cleidocranial dysplasia.

Front 10

Concerning hand-wrist radiographs, which
of the following statements is correct?
A. Bone age is estimated by the
presence or absence of osseous
centres in particular bones and
compared with standards.
B. Hand-wrist radiographs are a precise
measure of progress in skeletal
development in normal children.
C. The hand-wrist radiograph is of little
value in orthodontic diagnosis.
D. The information obtained from
radiographs alone is enough to make
an accurate determination of skeletal
age.

Back 10

A. Bone age is estimated by the
presence or absence of osseous
centres in particular bones and
compared with standards.

Front 11

In cephalometry, the most stable point in a
growing skull is the
A. sella turcica.
B. nasion.
C. Broadbent's point.
D. Bolton point.

Back 11

A. sella turcica.

Front 12

Which of the following patients should be
referred for orthodontic treatment to close
a diastema between maxillary central
incisors?
1. An 8-year old with no abnormal oral
habits.
2. A 14-year old with no abnormal oral
habits.
3. A 3-year old with a 4mm overjet.
4. An 8-year old with a previous thumb
habit.

Back 12

2. A 14-year old with no abnormal oral
habits.
4. An 8-year old with a previous thumb
habit.

Front 13

The radiographic appearance of internal
resorption is
A. radiolucent enlargement of the pulp
cavity.
B. radiolucency around the apex of the
root.
C. radiolucency on the surfaces of the
root.
D. localized radiopacities in the pulp
cavity.
E. radiopacity around the apex of the
root.

Back 13

A. radiolucent enlargement of the pulp
cavity.

Front 14

Roots of the permanent maxillary central
incisors are completed by what age?
A. 8 years.
B. 10 years.
C. 12 years.
D. Later than 12 years.

Back 14

B. 10 years.

Front 15

The developing permanent tooth
A. lies apically and lingually to primary
teeth in the anterior region.
B. may show deviated eruption times if
the primary tooth is lost prematurely.
C. has a more protrusive path of
eruption in the anterior region.
D. All of the above.

Back 15

D. All of the above.

Front 16

An endomorph is characterized as a person
who
A. is short and fat.
B. is tall and thin.
C. is muscular.
D. matures early.
E. matures late.

Back 16

A. is short and fat.

Front 17

Primate spacing in the primary dentition is
observed between
1. maxillary canines and first molars.
2. maxillary canines and lateral incisors.
3. mandibular canines and first molars.
4. mandibular canines and lateral
incisors.

Back 17

2. maxillary canines and lateral incisors.
3. mandibular canines and first molars.

Front 18

The anterior component of force may be
observed clinically as
A. distal movement of a permanent
mandibular cuspid.
B. mesial movement of a permanent
maxillary first molar.
C. A. and B.
D. None of the above.

Back 18

A. distal movement of a permanent
mandibular cuspid.
B. mesial movement of a permanent
maxillary first molar.

Front 19

If a child's teeth do not form, the primary
effect will be on the growth of the
A. alveolar bone.
B. mandible.
C. maxilla.
D. palate.

Back 19

A. alveolar bone.

Front 20

The organisms associated with a carious
pulpitis are
A. streptococci.
B. staphylococci.
C. spirochetes.
D. viruses.

Back 20

A. streptococci.

Front 21

Mandibular growth
A. is sustained over a longer period of
time in girls.
B. is sustained over a longer period of
time in boys.
C. occurs at the same chronologic age in
both sexes.
D. occurs two years earlier in boys than
in girls.

Back 21

B. is sustained over a longer period of
time in boys.

Front 22

Hypothyroidism affects the dental
developmental pattern by
A. interfering with jaw growth.
B. delaying the eruption timetable.
C. causing sclerotic bone to form over
the occlusal surface of erupting teeth.
D. accelerating the eruption timetable.

Back 22

B. delaying the eruption timetable.

Front 23

An overjet of 8mm is usually associated
with
A. Class I cuspid relationship.
B. Class II cuspid relationship.
C. Class III cuspid relationship.
D. Class I molar relationship.

Back 23

B. Class II cuspid relationship.

Front 24

A single tooth anterior crossbite found in a
9 year old should
A. self-correct.
B. be treated with a removable
appliance.
C. have 2 arch orthodontic treatment.
D. be treated in the complete permanent
dentition.
E. be observed and treated when the
cuspids have erupted.

Back 24

B. be treated with a removable
appliance.

Front 25

The significant factor in the correction of
an anterior cross-bite is the
A. age of patient.
B. depth of cross-bite.
C. shape of the tooth involved.
D. space available mesiodistally.

Back 25

D. space available mesiodistally.

Front 26

In a chronic mouth breather, you would
most likely see
1. a high narrow palate.
2. a crossbite
3. a Class II malocclusion.
4. short lower face height.

Back 26

1. a high narrow palate.
2. a crossbite
3. a Class II malocclusion.

Front 27

An 11-year old child has an open bite
caused by active thumbsucking. You
would
A. insert a habit-breaking appliance.
B. refer to a psychologist for evaluation.
C. encourage the child to accept help in
discontinuing the habit and observe
periodically.
D. refer to an orthodontist.

Back 27

D. refer to an orthodontist.

Front 28

The treatment of a Class II, Division 1
malocclusion has the best prognosis when
A. there is labial tipping of the
maxillary incisors.
B. there is a satisfactory relationship of
maxillary and mandibular apical
bases.
C. there is no archlength(tooth size)
discrepancy.
D. There is a short lower anterior face
height.
E. All of the above.

Back 28

E. All of the above.

Front 29

Loops and helices in wires are used in
orthodontic appliances to provide
A. a decreased force.
B. a greater range of activation.
C. more precise control of tooth
movement.
D. All of the above.

Back 29

B. a greater range of activation.

Front 30

Mandibular condylar region grows by
A. sutural and interstitial proliferation.
B. interstitial and appositional
proliferation.
C. appositional and sutural proliferation.
D. interstitial proliferation only.
E. appositional proliferation only.

Back 30

B. interstitial and appositional
proliferation.

Front 31

The roots of primary molars in the absence
of their permanent successors
1. sometimes are partially resorbed and
become ankylosed.
2. may remain for years with no
significant resorption.
3. may remain for years partially
resorbed.
4. are always resorbed.

Back 31

1. sometimes are partially resorbed and
become ankylosed.
2. may remain for years with no
significant resorption.
3. may remain for years partially
resorbed.

Front 32

A Class II dental occlusion in the mixed
dentition will likely
A. develop into a Class I occlusion after
normal exfoliation of the primary
molars.
B. worsen with forward growth of the
maxilla.
C. develop into a Class I occlusion with
late mandibular growth.
D. develop into a skeletal malocclusion
with growth of the maxilla and
mandible.
E. not change as the maxilla and
mandible grow.

Back 32

A. develop into a Class I occlusion after
normal exfoliation of the primary
molars.

Front 33

Which of the following factors is(are)
related to a malocclusion caused by
thumbsucking?
A. Duration.
B. Frequency.
C. Intensity.
D. All of the above.

Back 33

D. All of the above.

Front 34

Alveolar bone is undergoing remodeling
A. through the primary dentition.
B. until the end of mixed dentition.
C. until the complete eruption of
permanent teeth.
D. throughout life.

Back 34

D. throughout life.

Front 35

Pressure and tension have little effect on
growth of
A. the fronto-maxillary suture.
B. the alveolus.
C. the mandible.
D. cartilage.

Back 35

D. cartilage.

Front 36

A single hypoplastic defect located on the
labial surface of a maxillary central incisor
is most likely due to a/an
A. dietary deficiency.
B. endocrine deficiency.
C. tetracycline therapy.
D. trauma to the maxillary primary
central incisor.
E. high fluoride intake.

Back 36

D. trauma to the maxillary primary
central incisor.

Front 37

The term "dental age" refers to the
A. state of dental maturation.
B. eruption time of a given tooth.
C. number of years elapsed since a
given tooth erupted.
D. None of the above.

Back 37

A. state of dental maturation.

Front 38

The best time to correct a permanent
maxillary central incisor cross-bite is
A. after the canines erupt.
B. after the central incisors erupt.
C. after the lateral incisors erupt.
D. during the eruptive stage of central
incisors.

Back 38

D. during the eruptive stage of central
incisors.

Front 39

When taking radiographs on a 10 year old
child, which of the following should be
used to decrease radiation exposure?
1. A lead apron.
2. A decrease of the kilovoltage to
50kVp.
3. Use of high speed film.
4. Application of a radiation protection
badge.

Back 39

1. A lead apron
.3. Use of high speed film.

Front 40

An exchange of calcium ions between
saliva and enamel is
1. affected by fluoride.
2. a component of remineralization and
demineralization.
3. important in maintenance of tooth
structure.
4. pH dependent.

Back 40

E. All of the above.

Front 41

A 3 year old requires the extraction of a
deciduous maxillary second molar. The
local anesthetic technique of choice is
A. a posterior superior alveolar block.
B. buccal and palatal infiltration.
C. a tuberosity block plus subperiosteal
infiltration of the mesio-buccal root.
D. an infra-orbital block.

Back 41

B. buccal and palatal infiltration.

Front 42

A 9-year old boy is brought to the office
for treatment immediately following a
facial injury with a fracture of enamel only
of a maxillary central incisor. The tooth
tests completely negative to an electric
pulp tester. This finding indicates that the
tooth
A. is non-vital and should be extracted.
B. is non-vital and endodontic therapy
may save the tooth.
C. probably has a root fracture and is
not amenable to root canal therapy.
D. may be only temporarily nonresponsive
and should be checked at
a later date.

Back 42

D. may be only temporarily nonresponsive
and should be checked at
a later date.

Front 43

Class II malocclusions can be prevented
by
A. maintaining the integrity of the
primary dentition.
B. preventing thumbsucking and lip
biting habits.
C. correcting mouth breathing as early
as possible.
D. None of the above.

Back 43

D. None of the above.

Front 44

The mechanism of adjustment to maintain
the shape and proportions of bone
throughout its growth period is called
A. remodeling.
B. cortical drift.
C. area relocation.
D. translatory growth.

Back 44

A. remodeling.

Front 45

Tooth development begins when the basal
layer of cells proliferates to form a ridge
called the
A. dental lamina.
B. dental papilla.
C. odontoblastic matrix.
D. invaginating cap.

Back 45

A. dental lamina.

Front 46

The sequence of eruption of the
mandibular permanent teeth is normally
1. central incisor.
2. lateral incisor.
3. canine.
4. first premolar.
5. second premolar.
6. first molar.
7. second molar.

Back 46

D. (6)(1)(2)(3)(4)(5)(7)

Front 47

The most frequent cause of malocclusion
is
A. thumbsucking.
B. mouth breathing.
C. heredity.
D. ectopic eruption.

Back 47

C. heredity.

Front 48

Premature loss of mandibular deciduous
cuspids in Class I and Class II cases
results in increased
1. overjet.
2. arch width.
3. overbite.
4. leeway space.

Back 48

1. overjet.
3. overbite.

Front 49

In the mandibular dental arch of a 12-year
old boy, the permanent first molars are in
contact with the first premolars and the
crowns of the second premolars have
erupted lingually. The likely cause is
A. ankylosis of the mandibular second
premolars.
B. lack of space.
C. teeth too large for the dental arch.
D. premature loss of deciduous second
molars.
E. faulty lingual eruption of the second
premolars.

Back 49

D. premature loss of deciduous second
molars.

Front 50

Thumbsucking in most cases does not
cause permanent harm to the dentition if
the habit is
A. discontinued before four years of
age.
B. discontinued before eight years of
age.
C. practised only at night.
D. is light in intensity.
E. None of the above.

Back 50

A. discontinued before four years of
age.