Exam (elaborations)
OPD (LATEST) QUIZZES & ANS, GRADED A+
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OPD (LATEST) QUIZZES & ANS, GRADED A+
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OPD1. Which of the following a. Patients with bruxism or clenching habits.
is required for greater - Poor strength of crowns may fracture in patients
strength in crowns? with bruxism or reduced inter-occlusal clearance
a. Patients with bruxism
or clenching habits.
b. Teeth with deep
caries lesion
c. All of the above
d. None of the above
2. Following are common c. None of the above
causes of failure of indi- - Any tooth preparation for a crown should follow
rect restoration except: the appropriate biomechanical principles
a. poor preparation de-
sign/shape resulting in
lack of retention and/or
resistance form
b. insufficient reduction
or lack of support/thick-
ness for ceramic or
composite
c. None of the above
d. failure to identify
and/or correct occlusal
problems
3. Gold can be used in a. First statement is FALSE and second statement
thin sections and it is is TRUE
highly aesthetic. One - Gold can be used in thin sections but it is not
millimeter of tooth re- highly aesthetic.
duction is required oc-
clusally, with the excep-
tion of the functional
cusp bevel where 1.5
mm is necessary.
a. First statement is
, OPD
FALSE and second
statement is TRUE
b. First statement is
TRUE and second
statement is FALSE
c. BOTH statement are
FALSE
d. BOTH statements
TRUE
4. Porcelain laminate ve- a. TRUE
neers may also be used - Porcelain laminate veneers used to correct
to correct peg-shaped pegshaped lateral incisors, to close proximal spac-
lateral incisors, to close ing and diastemas, to repair (some) fractured in-
proximal spacing and cisal edges, and to align labial surfaces of instand-
diastemas, to repair ing teeth.
(some) fractured incisal
edges, and to align labi-
al surfaces of instand-
ing teeth
a. TRUE
b. FALSE
5. Computer-aided design d. BOTH statements are TRUE
and manufacture tech- - CAD-CAM are capable of producing accurate-
niques (CAD-CAM) are ly fitting inlays from blocks of ceramic material.
capable of producing Composite inlays are constructed from a variety
accurately fitting inlays of composite types and are 'supercured' using a
from blocks of ceram- mixture of heat and pressure, and heat and light.
ic material. Compos-
ite inlays are construct-
ed from a variety of
composite types and
are 'supercured' using
a mixture of heat and
pressure, and heat and
light.
, OPD
a. First statement is
FALSE and second
statement is TRUE
b. First statement is
TRUE, and second
statement is FALSE
c. BOTH statement are
FALSE
d. BOTH statements are
TRUE
6. A patient arrives at your c. The preparation walls were tapered at about 15°
office with their full - Taper provides the optimal friction between the
gold crown in hand. walls and the casting, which is the main retention.
They explain to you that The ferrule/height of the preparation also provides
another dentist deliv- the friction, thus, retention, but 4mm is enough
ered it just last week. (minimal: 3mm)
You then examine the
crown and the prepara-
tion. What is most like-
ly reason the crown fell
off?
a. There was very little
cement in the crown
b. The preparation was
only 4 mm high
c. The preparation walls
were tapered at about
15°
d. The margins were
jagged and undefined
7. The most retentive c. The statement is correct, but the reason is not
style of pins is the - Although the pinhole is smaller than the self-
self-threaded pins be- threaded pin, it is NOT cemente
cause they are cement-
ed into pinholes that
are smaller than the pin
, OPD
itself.
a. Both statement and
the reason are correct
and related
b. Both the statement
and the reason are cor-
rect but not related
c. The statement is cor-
rect, but the reason is
not
d. The statement is not
correct, but the reason
is correct
e. Neither the statement
nor the reason is cor-
rect
8. Whenever the caries c. Forward caries
cone in enamel is larger - Forward caries: The caries cone in enamel is
or at least the same size larger or at least the same size as that in dentin.
as that in dentin, it is - Backward caries: when the spread of caries along
called as the DEJ exceeds the caries in the contiguous
enamel, caries extends into this enamel from the
a. Residual caries junction.
b. Recurrent caries
c. Forward caries
d. Backward caries
9. Mecuroscopic expan- c. Mercury released as a result of electrochemical
sion in dental amalgam corrosion re-reacts with AgSn particle
occurs when: - Electrochemical corrosion produces extrusion
at margins (creep), during which mercury from
a. Moisture contamina- Sn-Hg rereacts with Ag-Sn particles and produces
tion occurs during con- further called Mercuroscopic expansion.
densation of zinc con-
taining amalgam
b. Moisture contamina-
tion occurs during trit-
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