NBDE Part II Prosthodontics UPDATED
Exam Questions and CORRECT Answers
Back pressure porosity is suggested by the presence of what? - CORRECT ANSWER -
presence of rounded edges of the casting instead of sharp and angled edges
when is relining an RPD indicated - CORRECT ANSWER - when the distal extensions are
depressed
indirect retainers do not seat properly when the distal extensions are depressed due to the loss of
support along the distal alveolar ridge
blade and root-form dental implants are examples of which class of implants? - CORRECT
ANSWER - endoosseous implants
placed directly into the bone and act as an anchor or root that will hold the crown, bridge, or
implant supported denture in place
why do dentists splint adjacent abutment teeth in an FPD - CORRECT ANSWER -
improve distribution of occlusal load
how to establish a more balanced occlusion during lateral excursive and protrusive movements? -
CORRECT ANSWER - increasing the compensating curve
(includes curve of spee, curve of monsoon, curve of Wilson)
what problem can occur when a custom tray does not have occlusal stops for a polysulfide final
impression? - CORRECT ANSWER - an inaccurate final impression will occur due to a
permanent distortion incurred during the setting reaction
,when casting gold, shrinkage porosity is associated with what? - CORRECT ANSWER -
sprue diameter
what are the 7 symptoms of combination syndrome? - CORRECT ANSWER - 1. bone loss
in the pre-maxilla
2. hypertrophy of the posterior maxillary tuberosities
3. extrusion of the lower anterior teeth
4. posterior bone loss in the mandible under the RPD
5. papillary hyperplasia of the maxilla
6. decreased VDO
7. facial esthetics altered due to the loss of VDO
what is the best way to avoid porcelain failure in all ceramic restorations? - CORRECT
ANSWER - rounded angles of the preparation
the proximal grooves of a partial veneer crown for tooth #8 are placed parallel to which of the
following? - CORRECT ANSWER - incisal 2/3 of the facial axial wall
when fabricating a complete mandibular denture for a patient with severe ridge resorption and
persistent tissue inflammation, what should the clinician do? - CORRECT ANSWER -
maximize the extension of the denture distally to distribute the masticatory forces over a broader
area
, what could happen with a cantilever FPD? - CORRECT ANSWER - can damage the
abutment's tooth periodontal support when excessive force is transmitted by the large occlusal
table of a cantilevered FPD
what defect can happen when a red hot gold restoration is plunged into an acid bath? -
CORRECT ANSWER - warping of the restoration
where should the thinnest/weakest portion of a wax pattern be placed? - CORRECT
ANSWER - in the deepest part of the ring, farthest form the sprue base to ensure the
margins of the wax pattern will not be insufficient when contraction occurs
what is a sprue? - CORRECT ANSWER - a conduit where molten metal may flow into the
mold when the wax pattern is already gone
the path of insertion of the key into teh keyway should be parallel to the path of insertion of
which of the following objects when using a non-rigid connector for a fixed partial denture? -
CORRECT ANSWER - the retainer NOT carrying the keyway
mounting patient casts in centric relation (true hinge axis) is most crucial when the treatment
plan involves which modification - CORRECT ANSWER - the treatment plan is to change
the vertical dimension of occlusion through fixed restorations
what is the true hinge axis? - CORRECT ANSWER - a line that passes through teh left and
right mandibular condyles
coincides with the center of rotation of the mandible
what is the primary factor when determining the type of major connector to be used for the lower
arch? - CORRECT ANSWER - the space between the floor of the mouth and the marginal
gingiva
Exam Questions and CORRECT Answers
Back pressure porosity is suggested by the presence of what? - CORRECT ANSWER -
presence of rounded edges of the casting instead of sharp and angled edges
when is relining an RPD indicated - CORRECT ANSWER - when the distal extensions are
depressed
indirect retainers do not seat properly when the distal extensions are depressed due to the loss of
support along the distal alveolar ridge
blade and root-form dental implants are examples of which class of implants? - CORRECT
ANSWER - endoosseous implants
placed directly into the bone and act as an anchor or root that will hold the crown, bridge, or
implant supported denture in place
why do dentists splint adjacent abutment teeth in an FPD - CORRECT ANSWER -
improve distribution of occlusal load
how to establish a more balanced occlusion during lateral excursive and protrusive movements? -
CORRECT ANSWER - increasing the compensating curve
(includes curve of spee, curve of monsoon, curve of Wilson)
what problem can occur when a custom tray does not have occlusal stops for a polysulfide final
impression? - CORRECT ANSWER - an inaccurate final impression will occur due to a
permanent distortion incurred during the setting reaction
,when casting gold, shrinkage porosity is associated with what? - CORRECT ANSWER -
sprue diameter
what are the 7 symptoms of combination syndrome? - CORRECT ANSWER - 1. bone loss
in the pre-maxilla
2. hypertrophy of the posterior maxillary tuberosities
3. extrusion of the lower anterior teeth
4. posterior bone loss in the mandible under the RPD
5. papillary hyperplasia of the maxilla
6. decreased VDO
7. facial esthetics altered due to the loss of VDO
what is the best way to avoid porcelain failure in all ceramic restorations? - CORRECT
ANSWER - rounded angles of the preparation
the proximal grooves of a partial veneer crown for tooth #8 are placed parallel to which of the
following? - CORRECT ANSWER - incisal 2/3 of the facial axial wall
when fabricating a complete mandibular denture for a patient with severe ridge resorption and
persistent tissue inflammation, what should the clinician do? - CORRECT ANSWER -
maximize the extension of the denture distally to distribute the masticatory forces over a broader
area
, what could happen with a cantilever FPD? - CORRECT ANSWER - can damage the
abutment's tooth periodontal support when excessive force is transmitted by the large occlusal
table of a cantilevered FPD
what defect can happen when a red hot gold restoration is plunged into an acid bath? -
CORRECT ANSWER - warping of the restoration
where should the thinnest/weakest portion of a wax pattern be placed? - CORRECT
ANSWER - in the deepest part of the ring, farthest form the sprue base to ensure the
margins of the wax pattern will not be insufficient when contraction occurs
what is a sprue? - CORRECT ANSWER - a conduit where molten metal may flow into the
mold when the wax pattern is already gone
the path of insertion of the key into teh keyway should be parallel to the path of insertion of
which of the following objects when using a non-rigid connector for a fixed partial denture? -
CORRECT ANSWER - the retainer NOT carrying the keyway
mounting patient casts in centric relation (true hinge axis) is most crucial when the treatment
plan involves which modification - CORRECT ANSWER - the treatment plan is to change
the vertical dimension of occlusion through fixed restorations
what is the true hinge axis? - CORRECT ANSWER - a line that passes through teh left and
right mandibular condyles
coincides with the center of rotation of the mandible
what is the primary factor when determining the type of major connector to be used for the lower
arch? - CORRECT ANSWER - the space between the floor of the mouth and the marginal
gingiva
