NBDE Part II - Operative Dentistry UPDATED
ACTUAL Questions and CORRECT Answers
pH that enamel starts to 5.5 (critical pH)
demineralize
How do cells first attach - dextran or dextran
lextran?
. S. Mutans is involved in converting sucrose to
dextran using enzyme Glucosyltransferase.
What helps in carious progression LACTOBACILLUS
but it is not the primary initiator for
caries?
Best clinical determinant of root c) soft spot on tooth - visual and tactile methods
caries? are used to detect caries
a) sensitivity to cold
b) sensitivity to sweets
c) soft spot on tooth - visual and
tactile methods are used to detect
caries
T/F: remineralized teeth are stronger TRUE
than regular enamel.
reminieralized enamel is darker, harder, more
resistant
,For a lesion in enamel that has c) The remineralized enamel is DARKER than the
remineralized, what is most likely surrounding enamel
true?
a) The enamel has smaller
hydroxyapatite crystals than the
surrounding enamel
b) The remineralized enamel is
SOFTER then the surrounding
enamel
c) The remineralized enamel is
DARKER than the surrounding
enamel
d) The remineralized enamel is
ROUGH and cavitated
Most inter proximal caries lesion Just under/below contact
happens where?
What tooth is most likely to have Mandibular molar
occlusal caries?
40 y/o patient with all 32 teeth. No a) watch and observe
cavities. Has stain and catch in pit of
molar. What do you do?
a) watch and observe
b) sealant
c) composite
DMFT (decayed, missing, filled teeth) Quantifies how the PERMANENT dentition has
been affected by dental caries
no 3rd molars
, DMFS (decayed, missing, filled A more detailed index than DMFT as it quantifies
surfaces) how each tooth surface has been affected by
caries
3rd molars included
DEFT (decayed, extracted, or filled Quantifies how the PRIMARY dentition has been
teeth) affected by dental caries
DEFS (decayed, extracted, or filled Quantifies how each surface of the primary
surfaces) dentition has been affected by dental caries
Which population has the most Blacks
number of UNRESTORED caries?
Burs used for smoothing preps? a) More FLUTES and SHALLOW (red burs)
a) more flutes and shallow
b) more flutes and deeper
c) less flutes and shallow
d) less flutes and deeper
Bur used that converges F and L a) 245
walls?
a) 245
b) 7901
c) 169
What bur do you use to SHAPE 169
convergent walls for amalgam?
ACTUAL Questions and CORRECT Answers
pH that enamel starts to 5.5 (critical pH)
demineralize
How do cells first attach - dextran or dextran
lextran?
. S. Mutans is involved in converting sucrose to
dextran using enzyme Glucosyltransferase.
What helps in carious progression LACTOBACILLUS
but it is not the primary initiator for
caries?
Best clinical determinant of root c) soft spot on tooth - visual and tactile methods
caries? are used to detect caries
a) sensitivity to cold
b) sensitivity to sweets
c) soft spot on tooth - visual and
tactile methods are used to detect
caries
T/F: remineralized teeth are stronger TRUE
than regular enamel.
reminieralized enamel is darker, harder, more
resistant
,For a lesion in enamel that has c) The remineralized enamel is DARKER than the
remineralized, what is most likely surrounding enamel
true?
a) The enamel has smaller
hydroxyapatite crystals than the
surrounding enamel
b) The remineralized enamel is
SOFTER then the surrounding
enamel
c) The remineralized enamel is
DARKER than the surrounding
enamel
d) The remineralized enamel is
ROUGH and cavitated
Most inter proximal caries lesion Just under/below contact
happens where?
What tooth is most likely to have Mandibular molar
occlusal caries?
40 y/o patient with all 32 teeth. No a) watch and observe
cavities. Has stain and catch in pit of
molar. What do you do?
a) watch and observe
b) sealant
c) composite
DMFT (decayed, missing, filled teeth) Quantifies how the PERMANENT dentition has
been affected by dental caries
no 3rd molars
, DMFS (decayed, missing, filled A more detailed index than DMFT as it quantifies
surfaces) how each tooth surface has been affected by
caries
3rd molars included
DEFT (decayed, extracted, or filled Quantifies how the PRIMARY dentition has been
teeth) affected by dental caries
DEFS (decayed, extracted, or filled Quantifies how each surface of the primary
surfaces) dentition has been affected by dental caries
Which population has the most Blacks
number of UNRESTORED caries?
Burs used for smoothing preps? a) More FLUTES and SHALLOW (red burs)
a) more flutes and shallow
b) more flutes and deeper
c) less flutes and shallow
d) less flutes and deeper
Bur used that converges F and L a) 245
walls?
a) 245
b) 7901
c) 169
What bur do you use to SHAPE 169
convergent walls for amalgam?
