Questions 1-10
Question #1
In reference to the partially edentulous arch and accompanying framework shown---what is the
Kennedy classification?
Class I, Modification 0
Class II, Modification 1
Class III, Modification 0
Class IV, Modification 0
Does this RPD have an axis of rotation? If so, where is it located? What class(s) of RPDs do not
have an axis of rotation?
Answer to Question #1
The correct answer is
According to the Kennedy Classification, the partially edentulous arch
shown is a Class I, Modification 0. There are bilateral posterior extension
areas with no other modification (edentulous) space(s) present.
All class I RPDs have an axis of rotation. To be very specific, the axis of
rotation will pass through the rigid metal closest to the edentulous space
that lies above the survey line (height of contour). If the design is correct
and the laboratory and clinical procedures are carried out properly, the axis of rotation should
pass through the most distal rests on each side. The axis of rotation for this case is indicated by
the black line.
Class I and Class II RPDs always have an axis of rotation. Class III RPDs never have an axis of
rotation. Class IV RPDs seldom have an axis of rotation---some people consider that Class IV
RPDs have an axis of rotation if all the incisors and both canines are missing, creating an
"anterior extension" area.
Question #2
The accompanying figure depicts the lingual surface on the lower
anterior teeth of a patient who is currently wearing a bilateral
distal extension removable partial denture that was fabricated 5
years ago. What do you think is the most likely cause for the
tissue damage that has occurred on tooth #22?
The lower anterior teeth should have been plated and were not.
The patient's oral hygiene is poor and tissue breakdown followed pocket formation on the
distal of tooth #22.
A rest preparation and rest should have been placed on tooth #22.
A cast circumferential clasp was used on tooth #22----it should have been wrought wire.
Answer to Question #2
The best answer is
INCORRECT. Although plating may help to prevent this situation from occurring,
definitive rest seats under the plating would still be required.
INCORRECT. Poor oral hygiene can contribute to tissue breakdown. However, this type of
damage is caused by trauma from the downward movement of the RPD during function.
CORRECT. A rest preparation and rest are essential to proper functioning of the RPD. The
damage shown in the illustration is primarily caused by movement of the RPD toward the tissues
during function. Such damage would not have occurred if a good rest seat and rest were present.
INCORRECT. The type of clasp arm has nothing to do with tissue trauma of this type.
Question #3
Your patient has teeth 20-29 remaining. You plan to use mesial
rests and I-bars on both terminal abutments. Because there are
lingual tori present, you will need to use linguoplating in the
premolar areas. The illustration is a lingual view of teeth 27-29.
The dotted line on #29 represents the height of contour (survey line). What should be the
relationship of the superior border of the plating and the survey line?
The plating should extend above the survey line.
The plating should end at or below the survey line.
The plating must end exactly at the survey line.
The plating must end below the survey line.
Answer to Question #3
The correct answer is
The plating must end exactly at the survey line (height of contour).
If the plating ends below the survey line, there will be a space between the superior edge of the
plating and the tooth creating a food trap. In addition, the edge of the plating will stand away
from the tooth and may be irritating to the tongue.
If the plating ends above the survey line, it will pre-empt the mesial rest. The axis of rotation will
pass through the plating instead of the rest. The I-bar will contact the tooth in front of this "new"
axis of rotation and will engage the tooth when the extension base moves toward the residual
ridge. Also, since the plating will act like a rest on an inclined plane, there will be the tendency
to push the tooth toward the facial during function.
The fact that the plating must end exactly on the survey line makes
framework fabrication much more difficult for the laboratory
technician. Therefore, whenever possible, avoid plating terminal abutments on distal
extension RPDs.
Question #4
In the maxillary class III RPD shown either a palatal strap or an
anterior-posterior palatal strap major connector may be used. If an
anterior-posterior strap design is to be considered, the opening
between the anterior and posterior palatal straps should be at least
_______ mm.
5
10
15
20
Answer to Question #4
The best answer is
Although the exact space required is somewhat arbitrary, we generally feel that the opening
should be at least 15 mm. If the opening is less than 15 mm, the benefit gained from uncovering
the tissues may be offset by the increased "sensitivity" of the tongue to the multiple major
connector borders.
Question #5
True or False
Because there are no movable tissues on the palate, the borders of maxillary major connectors
may be located farther from the gingival margins than those of mandibular major connectors.
True
False
Answer to Question #5
The correct answer is True
Major connectors on the maxillary arch should be at least 6 mm from the gingival margin. On the
mandibular arch, the proximity of movable tissues will not permit this amount of distance. In
general, mandibular major connectors should be at least 3 mm from the gingival margin.
Question #6
On the mandibular class III framework shown, circumferential
clasps have been used on the canine, premolar, and molars.
Which one of the following statements regarding the clasping is
TRUE?
The retentive arms on the canine and premolar should be wrought wire while those on the
molars should be cast.
The lingual arms on the molars are frequently the retentive arms because there are often no
usable facial undercuts.
If the undercut on the second premolar is on the distofacial, the circumferential retentive arm
would most likely be changed to I-bars.
In order to ensure adequate retention, the tips of both the buccal and lingual arms on the
molars should be placed in undercuts.
Answer to Question #6
The correct answer is
Incorrect. All of the clasps should be cast. Since there is no functional movement of a class
III RPD, there is no need for the stress-breaking effects of wrought wire clasps.
Correct. Lower molars, particularly second or third molars, frequently have no facial
undercuts. In addition, the normal drift of the teeth is to the lingual, accentuating lingual
undercuts and minimizing facial undercuts.
Incorrect. Modified T-bars would be the retainers of choice if the undercuts were on the
distofacial. I-bars could be used but the tiny space between the I-bars and the denture base would
create food traps and would make the plastic very difficult to finish properly. In addition, the Ibars would tend to be very short and inflexible.
Incorrect. Only one arm of each clasp assembly should extend into an undercut (be
retentive). The other arm must be rigid to provide bracing or reciprocation and thus cannot
extend into an undercut and provide retention.
Question #7
True or False
On the RPD framework shown, the rests on teeth numbers 20 and
28 are indirect retainers and function when the patient bites down
on the distal extension area.
True
False
Answer to Question #7
The correct answer is
FALSE
Although the rests on teeth numbers 21 and 28 are indirect retainers, they function when the
extension base attempts to move away from the tissues (residual ridge)---not toward the residual
ridge as would occur when the patient bites down. These rests are called indirect retainers
because they increase the effectiveness of the direct retainers (clasps) when there is an attempt to
dislodge the prosthesis.
Question #8
True or False
Guide surface preparations should be completed before rest seat preparations.
True
False
Answer to Question #8
The correct answer is
TRUE
The tooth structure removed during guide surface preparation will adversely affect the shape and
contour of the rest seat preparation. Thus, the guide surfaces should be created BEFORE rest
seats are prepared.
Question #9
True or False
In the class II mandibular RPD shown to the right, the clasp on tooth #27 should be wrought wire
BECAUSE the cingulum rest acts like a distal rest and the tip of the retentive arm is in front of
the axis of rotation.
True
False
Answer to Question #9
The correct answer is
TRUE
Both the statement and the reason are true. The rigid metal located above the survey line (height
of contour) and closest to the edentulous space is that portion of the rest where it joins the guide
plate/minor connector. The tip of the clasp lies in front of the axis of rotation and the clasp will
be activated when the extension base moves toward the residual ridge. Thus, the clasp must be
flexible to provide stress relief for the abutment.
Question #10
True or False
When tripoding a cast, the vertical arm of the surveyor must be locked in position.
True
False
Answer to Question #10
The correct answer is
TRUE
The purpose of tripoding is to allow re-orientation of the cast in the same position at a later date.
Tripoding is based on the geometric principle that three points determine a plane. If the vertical
arm of the surveyor moves during the tripoding process, the plane indicated by the marks would
not be the same as that currently being used.
Question #11
Referring to the maxillary class II RPD design shown to the right, which
of the following statements is TRUE?
A short thick I-bar clasp could be used on tooth #6.
A wrought wire circumferential clasp could be used on tooth #6.
It is sometimes not necessary to use any clasp on tooth #6.
2 and 3 are both true
Answer to Question #11
The best answer is
Incorrect. Cast clasps should not be used anterior to the axis of rotation.
Incorrect. #2 is a true statement but not the BEST answer. The most commonly used
solution would be to use a WW clasp. The WW clasp would provide stress-relief through its
increased flexibility: an important attribute in this case since the abutment tooth is in front of the
axis of rotation.
Incorrect. #3 is a true statement but not the BEST answer. If the patient is an experienced
RPD wearer and retention is of minor importance, one might consider leaving the retentive arm
off tooth #6. This would be more likely if esthetics were a major consideration. A good option
might be to include the WW clasp initially and check the need for the clasp after delivery. This
would be done by merely bending the clasp slightly away from the tooth and having the patient
wear the prosthesis for a few days. If the patient managed the RPD without retention from the
clasp, it could be cut off.
Correct. #4 is the BEST answer. Both 2 and 3 are true statements.
Question #12
The following statement refers to the drawing of the class I RPD
to the right: The clasp arm on tooth #20 should be wrought wire
BECAUSE functional forces cause tissueward movement of the
denture base, the denture rotates around the rest (which is on the
distal), and the clasp arm engages the tooth, tending to tilt it
distally.
The statement and the reason are true AND related.
The statement and the reason are true but are NOT related.
The statement is true but the reason is false.
Neither the statement nor the reason is true.
Answer to Question #12
The answer is
The statements are both true and are related. The tip of the clasp arm would lie in front of the
axis of rotation and the clasp would engage the tooth during functional movement of the
extension base. Thus, the clasp needs to be flexible to provide stress relief to the abutment.
Question #13
In the maxillary class I RPD shown at the right, the posterior border
of the palatal plate major connector should be located
as far forward as is possible while maintaining enough width for
strength
approximately 20 mm behind the anterior border
approximately 10 mm anterior to the fovea palatini
at the posterior palatal seal area
Answer to Question #13
The answer is
Incorrect. The palatal plate major connector is selected because it provides maximum
support and denture style retention. Moving the posterior border forward negates both of these
attributes.
Incorrect. There is no such relationship between the anterior and posterior borders of a
maxillary palatal plate major connector.
Incorrect. One of the primary reasons a full palate is used is to create "denture style
retention." Termination of the major connector 10 mm anterior to the fovea palatini would place
the bead on the hard palate and a "seal" would be very difficult to achieve.
Correct. The border should be placed in the posterior palatal seal area and should be beaded.
One of the primary reasons a full palate is used is to create "denture style retention." To do so, a
"seal" must be created at the posterior border by slightly depressing the soft tissues.
Question #14
True or False
All components of a maxillary major connector should cross the palate at right angles to the
midline and curves in the major connector should be located to one side of the midline.
True
False
Answer to Question #14
The answer is
TRUE
Crossing the midline at right angles seems to create a situation which is less noticeable to the
tongue.
Question #15
In the case shown to the right, which is the most effective indirect
retainer?
The rest on tooth #19.
The rest on tooth #21.
The rest on tooth #27.
The rest on tooth #28.
Answer to Question #15
The correct answer is
The rests on #19 and #28 are not indirect retainers. Rests on #21 and #27 are indirect retainers.
The rest on #21 is further from a line connecting the tips of the retentive arms on theeth numbers
19 and 28 and is thus more effective than the rest on tooth #27. In reality, the rest on #27 could
be omitted without appreciable loss of indirect retention.
Question #16
What is the most significant problem with the rest shown on the
mandibular canine to the right?
The rest should be wider inciso-gingivally.
The rest should be located more toward the incisal edge.
The rest should be thicker buccolingually.
The rest should be located in a prepared rest seat.
Answer to Question #16
The correct answer is
Rests must be placed in prepared rest seats. This is particularly important on anterior teeth
where, without prepared rest seats, rests lie on inclined planes. Downward pressure on the rest
will tend to push the abutment buccally.
Note: the rest could be a little wider incisogingivally and it could also be a little thicker.
However, these problems pale in comparison to the fact that there is no rest preparation.
Question #17
True or False
In the RPD shown to the right, the guide surface - guide plate contacts
on the distal surfaces of teeth numbers 20 and 29 determine a definite
path of displacement/dislodgement.
True
False
Answer to Question #17
The answer is
FALSE.
The guide surface - guide plate contacts DO NOT determine a definite path of insertion in this
case. If the minor connectors to the rests on the mesial occlusal surfaces of the premolars are in
intimate contact with the abutments, they may help to ensure a definite path of
insertion/dislodgement. However, it is safest to place the tips of the I-bar retentive arms just in
front of the greatest mesiodistal curvature of the facial surface of the abutments. If the tips are
placed at or behind the greatest mesiodistal curvature, it would be possible for the RPD to move
slightly upward and backward allowing the retentive arms to escape the undercuts without
flexing. Under these circumstances, the RPD would not exhibit retention.
Question #18
True or False
The all plastic maxillary RPD should be avoided in all partial dentures except where the
prosthesis is considered transitional and loss of the remaining teeth is imminent.
True
False
Answer to Question #18
The answer is
TRUE
All plastic RPDs lack rigidity and tend to encourage plaque collection. Also, most lack adequate
rests. They should only be used on a temporary basis or when the dentition is "terminal."
Question #19
True or False
Tooth-supported RPDs require physiologic relief of the guide plates.
True
False
Answer to Question #19
The answer is
FALSE
Because tooth-supported RPDs do not exhibit movement toward the tissues during function,
physiologic relief is not necessary. Extension RPDs, on the other hand, do exhibit functional
movement and do require physiologic relief. This is accomplished as follows: first coat the guide
plates with chloroform and rouge or another disclosing medium, seat the framework in the
mouth, and push toward the tissues over the extension areas; then relieve the guide plate with a
fine textured stone. Repeat as necessary. It is very important that the guide plates do not bind
against the abutments during functional movement --- otherwise they will pre-empt the planned
mesial rests.
Question #20
The superior border of a mandibular lingual bar major connector must be at least _____ mm
below the gingival margins.
1-2
2-3
3-4
4-5
Answer to Question #20
The correct answer is
3-4 mm is a minimum. Numerous studies have shown that placing the superior border of the
major connector less than 3 mm away from the gingival margin leads to increased plaque
collection and subsequent increased marginal inflammation.
Question #21
For maxillary major connectors, except where plating is used, the border of the major connector
should be at least ______ mm away from the gingival margin.
1
3
5
6
Question #22
For the anterior-posterior palatal strap maxillary major connector, the anterior, posterior, and
lateral straps should be about ______ mm wide.
4-6
6-8
8-10
at least 10
Question #23
The basic philosophy of dental treatment for a partially edentulous patient is to
preserve what remains and restore what is missing
replace the missing teeth
improve the path of insertion
reshape rotated teeth
Question #24
It is best not to use a balanced occlusion when mandibular RPDs oppose maxillary complete
dentures.
True
False
Question #25
The function of the guide plate is to
help establish a definitive path of insertion/dislodgement.
stabilize the RPD by controlling its horizontal position.
provide contact with the adjacent tooth.
all of the above
Question #26
What is the design error in the maxillary RPD framework shown
to the right?
The anterior teeth should have been plated.
An anterior-posterior palatal strap major connector should
have been used.
There should be a cast circumferential clasp on tooth #6.
The posterior border of the major connector should cross the palate at right angles to the
midline.
Question #27
What would be the best denture base connector when there is limited interocclusal space (<3
mm).
Open latticework
Meshwork
All metal base
All plastic base
Question #28
The first consideration in developing occlusion is the evaluation and establishment of the correct
position of the occlusal plane. This may be compromised by super-erupted and malposed teeth.
True
False
Question #29
Your patient's partially edentulous arch is depicted in the
illustration to the right. The missing teeth (with the exception of
the third molars) were extracted three weeks ago. What would be
the best denture base/replacement teeth combination in this
instance?
Open latticework
Metal bases with beads for attachment of processed tooth colored acrylic resin.
An all metal base
Tube teeth
Question #30
A wrought wire clasp is NOT used in which of the following situations?
On a terminal abutment of an extension RPD.
As an embrasure clasp.
On a tooth with an indirect retainer on it.
Both 1 and 2 above.
Questions 31-40
Question #31
True or False
In designing a RPD framework for the partially edentulous arch
to the right---if at all possible, circumferential clasps should be
used on the numbers 28 and 30. They would be preferred to
infrabulge retainers.
True
False
Question 32
True or False
Determining areas for physiologic relief is accomplished by marking the framework intraorally.
This process includes adjusting the casting to allow for functional movement on Class I and II
RPDs to relieve stress on the terminal abutment teeth.
True
False
Question 33
Reciprocation between bracing and retentive components requires
I-bars be used
bracing components contact after retentive components
correct timing of contact during seating and removal of the RPD
both 2 and 3
Question 34
Infrabulge clasps originate
above the height of contour
below the height of contour
above the 0.01" undercut
above the occlusal surface of most premolars
Question 35
True or False
A modified palatal plate is used in maxillary class II cases and may or may not include lingual
plating
True
False
Question 36
All of the following clasps are infrabulge clasps except?
I-bar
Modified T-bar
Roach clasp
Akers clasp
Question 37
A clasp assembly should
have a retentive arm with adequate length and taper for flexibility
have a retentive arm that terminates in an undercut
have elements that considered together, provide 180 degree encirclement
all of the above
Question 38
The partial denture that will be completed on the framework
shown to the right can do all of the following except
transfer stresses to the abutment teeth
transfer stresses across the arch
minimize supereruption of opposing teeth
act as an orthodontic retainer for the lower incisor teeth.
Question 39
True or False
Maxillary class II RPDs do not have an axis of rotation because no functional movement will
occur over the hard midline suture of the palate.
True
False
Question 40
In a Class III modification 1 RPD, the rests are usually placed
on the canines
away from the modification space
in the area of the opposing occlusal contact
adjacent to the modification space.
Questions 41-50
Question #41
A mandibular lingual bar major connector such as the one shown in
the RPD to the right requires a minimum of _____mm of vertical
height between the gingival margin and the floor of the mouth.
4
5
7
8
Question 42
The presence of mandibular lingual tori would indicate the need for
a metal base
lingual plating
tube teeth
extra indirect retainers
Question 43
The illustration to the right shows a framework for a mandibular class
II RPD. The indirect retainer on tooth 21 functions when
the patient chews on something hard
the patient chews on something soft
the patient chews on something sticky
the patient bites the bullet
Question 44
True or False
An anterior-posterior palatal strap maxillary major connector has greater strength and rigidity
than a horseshoe design.
True
False
Question 45
Your patient has the mandibular arch form shown to the right. A
rest on which tooth would be the most effective indirect retainer?
20
21
22
27
Question 46
Your patient exhibits the mandibular class II modification 1 arch
shown to the right. Tooth #30 is tilted mesiolinguallly and has
very little tissue undercut on the lingual. What is the best clasp
for this situation?
Cast circumferential clasp utilizing a distolingual undercut
Cast I-bar utilizing a mesiolingual undercut
Cast ring clasp utilizing a mesiolingual undercut
Wrought wire circumferential clasp utilizing a distolingual undercut.
Question 47
Rigid metal retention is associated with
a dual path of insertion
a class IV RPD
the need for excellent esthetics
all of the above
Question 48
True or False
The palatal strap maxillary major connector is primarily used in short span maxillary class III
modification 1 RPDs.
True
False
Question 49
Your patient has the class I arch shown to the right. The axis of
rotation is most frequently determined by:
the placement (location) of the primary rests
the type of clasp arms selected
the placement of the minor connectors
the placement of the indirect retainers
Question 50
In maxillary RPDs, the bead line is approximately _______mm thick (deep).
4
3
2
1
Questions 51-60
Question #51
The C + 1 rule
Does not apply to class IV RPDs
Does not apply to class III RPDs
Gives a general rule for the number of clasps
Both 1 and 3
Question #52
Which of the following maxillary major connectors possesses the least strength and rigidity?
Anterior-posterior palatal strap
Horse-shoe
Palatal plate
Modified palatal plate
Question #53
True or False
A cingulum rest is normallly placed between the middle and incisal thirds of the maxillary
incisors in order to avoid occlusal interferences.
True
False
Question #54
Your patient exhibits the mandibular class II modification 1 arch
shown to the right. Tooth #30 is tilted mesiolingually, but has a
very severe tissue undercut on the lingual. What is the best clasp
for this situation?
Cast circumferential clasp utilizing a distolingual undercut.
Cast I-bar utilizing a mesiolingual undercut.
Cast ring clasp utilizing a mesiolingual undercut.
Wrought wire circumferential clasp utilizing a distolingual undercut.
Question #55
True or False
All methods of measuring the vertical dimension of occlusion agree on one major principle: In
physiologic functions (speaking and swallowing) the teeth should make contact.
True
False
Question #56
True or False
Malposed or super-erupted teeth may cause a discrepancy between centric relation and centric
occlusion. Therefore, it is recommended that the opposing teeth not touch during the making of a
centric relation record for mounting of diagnostic casts.
True
False
Question #57
True or False
The purpose of the centric relation record is to record the exact position of the maxilla to the
mandible in a protrusive relation.
True
False
Question #58
True or False
If abutment teeth require crowns, the RPD design is prepared after the crowns are cemented.
True
False
Question #59
True or False
Alginate impression materials have excellent dimensional stability over time and seldom lead to
over extended vestibular extensions.
True
False
Question #60
True or False
Master casts for patients with lone-standing abutments should be poured in "Silky Rock" stone.
True
False
Questions 61-70
Question #61
True or False
The altered cast impression technique is often used on Class I and Class III RPDs.
True
False
Question #62
Your patient exhibits the partially edentulous mandibular arch
shown to the right. The maxillary arch is to be restored with a
complete denture. Teeth 20 and 29 will receive crowns. There are
no contraindications to any type of clasping. Which of the
following clasp assemblies would you use on 20 and 29.
Mesial rests and I-bars
Mesial rests and modified T-bars
Distal rests and WW circumferential clasps
Distal rests and cast circumferential clasps.
Question #63
Your patient exhibits the partially edentulous mandibular arch
shown to the right. The maxillary arch is to be restored with a
complete denture. Teeth 20 and 29 will receive crowns. There are
very high labial frenal attachments on both sides. Which of the
following clasp assemblies would you use on 20 and 29?
Mesial rests and I-bars
Mesial rests and modified T-bars
Distal rests and WW circumferential clasps
Distal rests and cast circumferential clasps.
Question #64
Your patient exhibits the partially edentulous mandibular arch
shown to the right. The maxillary arch is to be restored with a
complete denture. The undercuts on 20 and 29 are on the distal
portion of the facial surface. There are no contraindications to
either infrabulge or suprabulge retainers. Which of the following
clasp assemblies would you use on 20 and 29?
Mesial rests and I-bars
Mesial rests and modified T-bars
Distal rests and WW circumferential clasps
Distal rests and cast circumferential clasps
Question #65
True or False
Reciprocation of clasps is related to the timing of contact between the bracing and retentive clasp
arms in order to prevent undue forces on the abutment teeth during seating and removal of the
RPD.
True
False
Question #66
Your patient has the partially edentulous arch shown to the right.
The undercuts on 21 and 28 are on the mesiofacial surfaces. The
most commonly used clasp assemblies on the premolars would
be:
Distal rests and I-bars
Distal rests and modified T-bars
Distal rests and cast circumferential clasps
Distal rests and WW circumferential clasps
Question #67
Your patient has the partially edentulous arch shown to the right.
The undercuts on 21 and 28 are on the distofacial surfaces. There
are no contraindications to any types of clasps. Under these circumstances, the most commonly
used clasp assemblies on the premolars would be:
Distal rests and I-bars
Distal rests and modified T-bars
Distal rests and cast circumferential clasps
Distal rests and WW circumferential clasps
Question #68
Your patient has the partially edentulous arch shown to the right.
The undercuts on 21 and 28 are on the mesiofacial surfaces and
there are no contraindications to suprabulge or infrabulge
retainers. The long range prognosis for the molars is poor but
your patient does not want them extracted at this time. Several
alterations in the usual design could be made to facilitate later
conversion of the prosthesis to a class I RPD. One of them
involves the clasp assemblies on the premolars. Your recommendation?
Distal rests and I-bars
Distal rests and modified T-bars
Distal rests and cast circumferential clasps
Distal rests and WW circumferential clasps
Question #69
True or False
Your patient has the partially edentulous arch form shown to the right. The molars have drifted
mesially and lingually. With these factors in mind, rigid metal retention could be considered for
use on the molars.
True
False
Question #70
Which one of the following classes of RPDs NEVER has an axis of rotation?
Class I
Class II
Class III
Class IV
Questions 71-80
Question #71
What is the major problem with the RPD framework shown to the
right?
Teeth numbers 21 and 28 should be plated.
The plating on the lingual surfaces of the anterior teeth
should cover the cinguli.
Distal rests would be better than mesial rests on teeth numbers 21 and 28.
Cast circumferential clasps are preferred with the mesial rests on teeth numbers 20 and 29.
Question #72
Which of the following could be reason(s) for choosing the
double lingual bar major connector shown to the right?
Large interproximal spaces have resulted from periodontal
surgery.
The patient exhibits a high floor of the mouth.
There is overlapping of the anterior teeth.
Both a and b above.
Question #73
True or False
When possible, plating on maxillary RPDs should be avoided due to the potential for interfering
with speech and occlusion.
True
False
Question #74
The survey line (height of contour) of a full contour wax-up for a crown for an RPD abutment
tooth can be visualized using
red wax
zinc stearate powder
border wax
pressure indicating paste
Question #75
Your patient has only teeth numbers 20 through 29 remaining. You have tried in the framework
and are border molding the extension areas in preparation for an altered cast impression. The
distobuccal area is shaped by the?
Buccinator muscle
Masseter muscle
Internal pterygoid muscle
Mylohyoid muscle
Question #76
Your patient has teeth numbers 20 through 29 remaining. The
survey line and undercut (shaded area) for tooth #29 are as shown
on the right. There is no contraindication to the use of an
infrabulge clasps but there is a very solid contact in the mesialocclsual fossa. What would be your choice for rest location and
retentive arm?
Distal rest and cast circumferential clasp
Distal rest and cast I-bar
Mesial rest and cast I-bar
Distal rest and WW circumferential clasp
Question #77
Your patient has teeth numbers 20 through 29 remaining. The
survey line and undercut (shaded area) for tooth #29 are as shown
on the right. There is no contraindication to the use of an
infrabulge clasps and there are no occlusal problems affecting rest
location. What would be the best choice for rest location and
retentive arm?
Mesial rest and I-bar
Mesial rest and modified T-bar
Mesial rest and WW circumferential clasp
Distal rest and WW circumferential clasp
Question #78
Your patient has teeth numbers 20 through 29 remaining. The
survey line and undercut (shaded area) for tooth #29 are as shown
on the right. There is no contraindication to the use of an
infrabulge clasps. The opposing occlusion is provided by a
complete denture. What would be your choice for rest location
and retentive arm?
Mesial rest and I-bar
Mesial rest and modified T-bar
Mesial rest and cast circumferential clasp
Distal rest and WW circumferential clasp
Question #79
Your patient has only teeth numbers 20 through 29 remaining. You have tried in the framework
and are border molding the extension areas in preparation for an altered cast impression. The
distolingual border molding is shaped by the?
Masseter muscle
Internal pterygoid muscle
Superior constrictor muscle
Mylohyoid muscle
Question #80
True or False
As a general rule, plating is indicated for the maxillary arch if there are less than three
contiguous maxillary incisor teeth remaining.
True
False
Questions 81-90
Question #81
All of the components listed below may be involved in the 180 degree encirclement rule
EXCEPT
I-bar
Minor connector
Guide plate
Open latticework
Question #82
What is the correct relationship of the foot of an I-bar to the survey line (height of contour) on a
terminal abutment for an extension RPD?
The foot should be entirely above the survey line.
The foot should be partially above and partially below the survey line.
The foot should be totally below the survey line.
The relationship of the foot of the I-bar and the survey line is of no consequence.
Question #83
True or False
The primary indication for and Oddo clasp occurs when an anterior abutment has excessive
labial inclination so that the retainer (clasp) would be very close to the incisal edge.
True
False
Question #84
True or False
The purpose of the altered cast impression procedure is to obtain the maximum support possible
from the edentulous areas of class I and class II RPDs.
True
False
Question #85
True or False
When there are extensive edentulous areas present in both arches and no opposing teeth meet, we
should establish the vertical dimension of occlusion prior to making a centric relation record.
True
False
Question #86
True or False
You are fabricating maxillary and mandibular RPDs for your patient. At the framework try-in
appointment, both frameworks should initially be placed in the mouth to check for occlusal
interferences.
True
False
Question #87
True or False
A protrusive record is made with the mandibular anterior teeth approximately 6 mm forward of
centric relation (or with the mandibular and maxillary anterior teeth in an edge to edge
relationship). This record is used to set the horizontal condylar guidance on the articulator.
True
False
Question #88
True or False
The space that opens between the posterior teeth during anterior movement of the mandible is
called Christensen's Phenomenon. This posterior separation is increased if the incisal guidance is
increased.
True
False
Question #89
True or False
Before trying in a framework, you should inspect the master cast for damage and inspect the
framework for sharp fins.
True
False
Question #90
True or False
Your RPD framework fits the cast but does not fit in the mouth. One should assume that the
impression for the cast was inaccurate and that a new impression will need to be made.
True
False
Questions 91-100
Question #91
True or False
The fewer teeth that remain, the more like a denture the RPD becomes and the more likely the
need for a custom impression tray.
True
False
Question #92
Reason(s) for selecting a mandibular lingual plate major connector is/are?
The presence of lingual tori.
Anticipated loss of one or more of the remaining teeth.
A high lingual frenum.
1, 2, and 3 above
Question #93
Your patient has teeth 20 through 29 remaining. Tooth #29
exhibits the tooth contours and undercut shown in the illustration
to the right. Which of the clasp assemblies listed has the
GREATEST DANGER of torquing the abutment during
functional movements of the extension base?
Mesial rest and cast I-bar
Distal rest and WW circumferential clasp
RPA clasp assembly with a cast clasp
All have about the same potential danger
Question #94
Which of the following clasps commonly utilize lingual undercuts?
Ring clasp
Extended arm clasp
Half and half clasp
Both 1 and 3
Question #95
Which of the abutments in the partially edentulous arch to the
right has the greatest potential for utilization of a ring clasp?
#18
#21
#28
None of the abutments have any potential for the use of a ring clasp.
Question #96
True or False
Metal denture bases are most commonly used over well-healed posterior ridges where vertical
space is a problem.
True
False
Question #97
True or False
Referring to the partially edentulous arch shown to the right.
The guide plates on teeth 21 and 28 should curve buccolingually
and extend lingually just short of the distolingual line angles.
True
False
Question #98
A cingulum rest should be placed
between the occlusal and middle thirds of the incisor teeth.
above the middle third of the incisor teeth.
at the junction of the gingival and middle thirds of the incisor teeth.
on the disto-incisal edges of the incisor teeth.
Question #99
The external finish line is
the external junction of framework metal and denture base plastic.
the external junction of framework metal and supporting tissues.
the external junction of the framework metal and the natural teeth.
the external junction of the natural teeth and the denture base plastic.
Question #100
True or False
As a general rule, a removable partial denture needs C+1 clasps where C=Kennedy classification
number.
True
False
Questions 101-110
Question #101
A "bead" line"
is used only on mandibular major connectors
is a seal at the interface of framework metal and tissues
should taper off as it approaches the marginal gingiva of the abutment teeth
both 2 and 3 above
Question 102
Your patient has the partially edentulous arch shown in the illustration on the left. Tooth #28 has
the survey line and undercut shown in the illustration on the right. There are no contraindications
to any type of clasp or to any rest location. What would be your first choice for the clasp
assembly on tooth #28?
distal rest and cast circumferential clasp
distal rest and WW circumferential clasp
distal rest and I-bar clasp
distal rest and modified T-bar clasp
Question 103
Your patient has the partially edentulous arch shown in the left illustration. Tooth #28 has the
survey line and undercut shown in the illustration on the right. There are no contraindications to
any type of clasp or to any rest location. What would be the most common choice for the clasp
assembly on tooth #28?
distal rest and cast circumferential clasp
distal rest and WW circumferential clasp
distal rest and I-bar clasp
distal rest and modified T-bar clasp
Question 104
The superior border of a mandibular lingual bar major connector should be
at least 3 mm from the tooth/tissue junction
at least 2 mm from the tooth/tissue junction
located at the tooth/tissue junction
at least 3 mm above the tooth/tissue junction
Question 105
The internal finish line is
the butt joint between the metal and plastic on the tissue side of the edentulous area
the butt joint between the metal and plastic on the outer surface of the RPD
a type of posterior palatal seal
a special type of bead line
Question 106
A class I modification 0 RPD normally has how many clasps?
1
2
3
4
Question 107
Select a maxillary major connector for the large Class III
modification 1 RPD shown to the right. The residual ridges are
good and the abutment teeth are strong.
Palatal strap
Modified palatal plate
Horse-shoe
Anterior-posterior palatal strap
Question 108
True or False
When an RPD is fully seated, the tips of the clasp arms should exert very light pressure against
the abutment teeth.
True
False
Question 109
Your patient's partially edentulous arch form is shown in the left illustration. The clasp assembly
for tooth #20 is illustrated on the right. When is the retentive arm activated?
When the patient bites down on the extension base.
When there is an attempt to dislodge the RPD.
When the extension base moves toward the tissues.
It should never be activated.
Question 110
True or False
Guide plates for tooth-supported RPDs may extend above the height of contour while those on
extension RPDs should not.
True
False
Questions 111-120
Question 111
Select a maxillary major connector for the large Class III
modification 1 RPD shown to the right. The residual ridges are of
medium quality but the third molar abutment teeth are weak.
A wide single palatal strap
An anterior-posterior palatal strap
A modified palatal plate
A horse-shoe
Question 112
Select a maxillary major connector for the Class III modification
1 RPD shown to the right. The residual ridges are of good quality
and the first premolar and second molar abutment teeth are
strong.
Anterior-posterior palatal strap
Horse-shoe
Modified palatal plate
Palatal strap
Question 113
Select a maxillary major connector for the Class III modification
1 arch shown to the right. The residual ridges are of good quality
and the first premolar and third molar abutment teeth are strong.
The patient relates a long history of gagging problems and, in
fact, had major problems with the impressions for the study casts.
Anterior-posterior palatal strap
Horse-shoe
Modified palatal palte
Palatal strap
Question 114
Your patient has the partially edentulous arch shown in the left illustration. Tooth #28 has the
survey line and undercut shown in the right drawing. An infrabulge clasp CAN NOT be used
due to a very high frenal attachment immediately below the abutment. What would be your first
choice for the clasp on tooth #28?
A cast circumferential clasp
A wrought wire circumferential clasp
A cast circumferential embrasure clasp
A wrought wire circumferential embrasure clasp
Question 115
If a mandibular RPD abutment must be crowned, the FPD impression should include
all the abutment teeth for the RPD
a full arch impression
the retromolar pads
all of the above
Question 116
A tissue undercut may preclude the selection of
A suprabulge clasp
An infrabulge clasp
A half and half clasp
A combination clasp
Question 117
A combination clasp assembly generally has
a cast bracing arm
a distal rest
a wrought wire retentive arm
all of the above
Question 118
Your patient's partially edentulous mandibular arch form is
shown to the right. Which of the abutment teeth would be likely
to have a combination clasp?
Not likely on any of the abutments
#20 very likely; #29 less likely
#29 very likely; #20 less likely
#31 very likely; not likely on either #20 or #29
Question 119
A modified T-bar on a terminal abutment for a Class I partially edentulous arch (such as the one
shown)
is used with a distal rest
is placed into a distobuccal undercut
should have the vertical approach arm distal to the greatest mesio-distal curvature of the
facial surface
both 1 and 2
Question 120
Which of the following should be considered in diagnosis for an RPD patient?
interarch space
tissue undercuts
occlusal contacts
all of the above
Questions 121-130
Question #121
True or False
For a removable partial denture abutment that must be crowned, more than the normal occlusal
reduction will be required.
True
False
Question 122
A lingual plate mandibular major connector may be selected because
the mandibular incisors are tilted lingually
there are mandibular tori present
there is a high lingual frenum
all of the above
Question 123
A master cast for a RPD should be blocked out and duplicated before
overlapped incisors are recontoured
rest preparations are prepared
the framework is waxed up
all of the above
Question 124
Rest placement on a terminal abutment of a Class I RPD depends on
the opposing occlusion
the tilt of the abutment
tissue undercuts
all of the above
Question 125
What is the problem (if any) with the design of the I-bar on tooth #28?
The I-bar should be placed in front of the greatest mesio-distal curvature, not behind it.
The I-bar should be placed more distally, closer to the guide plate.
The I-bar should extend above the survey line.
There is no problem; the position of the I-bar is correct.
Question 126
Your patient has the arch form shown to the right. You plan to use mesial rests and I-bars but
will need to plate the premolars due to the tori. What should be the relationship of the superior
border of the plating and the height of contour on the lingual surfaces of teeth numbers 20 and
29?
The plating must end below the height of contour.
The plating must end at the height of contour.
The plating must end above the height of contour.
None of the above is correct.
Question 127
A general rule for clasping teeth which lie anterior to the axis of
rotation (e.g. tooth #21 in the illustration to the right) in a Class II
modification 1 RPD is:
Always use cast clasps
Never use suprabulge clasps
Use wrought wire clasps
Use 0.030 inch undercut for stability
Question 128
A general rule for rest placement on an abutment adjacent to an extension area is?
Place the rest on the occlusal surface on the opposite side of the tooth from the extension
area.
Place the rest on the occlusal surface adjacent to the extension area.
Place rests on both the mesial and distal occlusal surfaces.
Do not place a rest on this tooth.
Question 129
Low fusing metal is associated with which of the following procedures?
The altered cast impression.
Physiological adjustment of the framework.
The RPD remount cast.
Making records for RPDs.
Question 130
Physiologic adjustment of the framework
is usually done at delivery of the RPD.
should be done at the framework try-in appointment.
is usually done at the records appointment.
may be omitted in the presence of strong abutments and good residual ridges.
Questions 131-140
Question #131
True or False
An exception to the C+1 rule for number of clasps is the Class II modification 0 case.
True
False
Question 132
Physiologic adjustment is related to
the axis of rotation
adjustment of the framework to the teeth
functional movement of the framework
all of the above
Question 133
True or False
If physiologic adjustment of the framework is not done on a Class I modification 1 RPD, the
clasps may not release in function.
True
False
Question 134
True or False
The bracing arm of a circumferential clasp assembly must always lie at or above the height of
contour.
True
False
Question 135
Your patient has the partially edentulous arch shown to the right.
What would be the best clasps for tooth number 20 and 29 if they
were tilted mesially?
Mesial rests and cast I-bars
Mesial rests and WW I-bars
Distal rests and WW I-bars
Distal rests and combination clasps
Question 136
Your patient has the partially edentulous arch shown to the right.
The premolars are tilted lingually and there are no facial
undercuts. There are, however, undercuts on the lingual. What would be the best clasps for this
situation?
Lingual I-bars
Roach clasps
Akers clasps
Half and Half clasps
Question 137
The external finish line on a maxillary Class I RPD originates from the lingual of the guide plate
of the terminal abutment and ends
at the hamular notch.
in the glenoid fossa.
opposite the buccal pouch.
opposite Stenson's duct.
Question 138
The open latticework on a maxillary class I RPD
covers the hamular notch.
covers the tuberosity.
does not cover the tuberosity.
does not require substantial interach space.
Question 139
The partial denture design should be finalized prior to
any emergency treatment.
any fixed prosthodontic treatment.
preparation of rest seats.
both 2 and 3 above.
Question 140
Your patient has the partially edentulous arch shown to the right.
The root of #29 has been saved as an overdenture abutment.
True or False
The presence of the overdenture abutment may change the axis of
rotation but will not change the clasping considerations on tooth #28.
True
False
Questions 141-150
Question #141
When placing the tripod marks on the diagnostic cast, the vertical arm of the surveyor
should have the analyzing rod in place.
should be moved up or down to touch the tissues at widely separated areas.
Both 1 and 2 are true
Neither 1 nor 2 are true
Question 142
The internal and external finish lines are
normally superimposed over each other.
normally offset from each other to avoid weakness in the framework.
normally designed and placed independently.
none of the above statements are true.
Question 143
In general, lingual plating should be supported
by the inclined surfaces of the mandibular incisors.
with minor connectors.
with bracing arms.
with rests.
Question 144
A maxillary arch without three contiguous incisors (such as the
one shown)
usually requires plating of the remaining incisor
should not be plated
should have a horse-shoe major connector
both 1 and 3 above.
Question 145
The external finish line on the distal extension side of the
mandibular Class II modification 1 RPD for the partially
edentulous arch shown to the right
runs from the lingual frenum to the retromolar pad.
runs from the lingual of the guide plate to the floor of the mouth.
runs from the mesial of the guide plate to the retromolar pad.
cannot be determined without more information.
Question 146
True or False
Wrought wire retentive arms are usually selected for distal extension RPDs when the tips of the
arms lie behind the axis of rotation.
True
False
Question 147
Occlusal rest preparations should be
spoon shaped
at least 1/3 the buccolingual width of the occlusal surface
at least one millimeter deep
all of the above
Question 148
Guide plates for anterior teeth
should be kept to the labial for best esthetics.
should be kept to the lingual for best esthetics.
be thinned on the labial aspect.
both 2 and 3 above.
Question 149
An anterior-posterior palatal strap major connector is less rigid than a horse-shoe major
connnector because it (the A-P strap) has less width.
The first statement is true but the reason is false.
The first statement is false and the reason is also a false statement.
The first statement is true and the reason is true.
The first statement is false but the reason is a true statement.
Question 150
Your patient has the partially edentulous arch form shown. All of
the abutments have good bone support. On which one of the
abutments would you likely utilize a WW clasp?
#22
#29
#32
None of the above.
Questions 151-160
Question #151
Which of the following clasp assemblies utilize a primary rest and an auxiliary rest?
RPA clasp
Ring clasp
Infrabulge clasp
Extended arm clasp
Question 152
True or False
In a circumferential clasp assembly, only one of the arms may extend into an undercut.
True
False
Question 153
Which of the following steps is done LAST?
Rest preparation
Framework try-in
Centric relation records
Altered cast impression
Question 154
Incisal rests
are generally more positive vertical stops than cingulum rests.
may interfere with the opposing occlusion.
should not be used on maxillary incisors.
all of the above.
Question 155
True or False
Cast retentive arms are usually selected when the RPD is tooth supported or when the retentive
tips release during functional movements of extension RPDs.
True
False
Question 156
Cleaning a removable partial denture in sodium hypochlorite may result in
increased caries activity
increased periodontal problems
corrosion of the metal of the framework
1 and 2 above
Question 157
Which of the following clasp assemblies utilizes a lingual undercut and can be used on premolars
for either extension or tooth-supported RPDs?
half and half clasp
lingual I-bar
lingual modified T-bar
ring clasp
Question 158
If a metal base is to be used
an altered cast impression should be made after framework try-in
a stock tray should be used for the final impression
a custom tray should be used for the final impression
interocclusal records must be made after tooth selection
Question 159
True or False
When surveying to determine the height of contour of the abutments, the mark on the tooth must
be made by the side of the lead marker.
True
False
Question 160
Clasps
help stabilize the RPD by controlling occlusal movement.
help stabilize the RPD by controlling gingival movement.
may also function as indirect retainers.
prevent excessive biting forces on the abutments.
Questions 161-170
Question #161
Your patient exhibits the partially edentulous arch shown to the
right. Tooth #29 is tilted mesially. The undercut is on the
mesiofacial surface. What would be the best clasp assembly for
this situation?
Distal rest and cast circumferential clasp.
Distal rest and WW circumferential clasp.
Mesial rest and I-bar.
Distal rest and I-bar.
Question 162
During biting, a maxillary Class I RPD will rotate around a line determined by the rigid metal
above the survey line and closest to the extension areas. This line is called
Camper's line
Frankfurt line
Dual path line
Axis of rotation
Question 163
The WORST clasp assembly for a terminal abutment on a
mandibular class I RPD (such as #29 in the partially edentulous
arch to the right) is
Mesial rest and I-bar
Distal rest and cast circumferential clasp
Mesial and distal rest and a 1/2 and 1/2 clasp
Mesial rest and modified T-bar
Question 164
The guide surface preparation should be curved
mesio-distally
bucco-lingually
occluso-gingivally
none of the above
Question 165
Fill in the blank
What are the indications for a linguoplate as a major connector for a mandibular RPD?
Click on button 1 for the answer
Question 166
Fill in the blank.
Name four types of suprabulge clasps.
Click on button 1 to see the answer.
Question 167
Fill in the blank.
Your patient has teeth numbers 20 through 29 remaining. The illustration to the right shows the
design for a modified T-bar retainer on tooth #29. The vertical line on the tooth represents the
greatest mesiodistal curvature of the facial surface. Do you see any problems with the design?
Click button 1 to see the answer.
Question 168
Fill in the blank
In the illustration shown to the right, what would be your first
choice for a retainer (clasp) on tooth #6?
Click on button 1 to see the answer.
Question 169
Fill in the blank
Your patient has the partially edentulous arch shown to the right.
The molars have drifted mesially and lingually so that the only
usable undercuts are on the mesiolingual. What clasps would you
use on the molars if (1) there were no large tissue undercuts and (2) there were large tissue
undercuts?
Click on button 1 to see the answer.
Question 170
Fill in the blank
Which classes of mandibular RPDs require an altered cast impression?
Click on button 1 to see the answer.
Questions 171-180
Question #171
Fill in the blank
Important factors in determining the path of insertion/dislodgement are:
Click on button 1 for the answer.
Question 172
Fill in the blank
Incisal rests should generally not be used on maxillary incisors. Why?
Click on button 1 for the answer
Question 173
Fill in the blank
For tooth-supported RPDs, where are the primary rests normally placed?
Click on button 1 for the answer.
Question 174
Fill in the blank
For extension RPDs, where are the primary rests usually placed?
Click on button 1 for the answer.
Question 175
Fill in the blank
What is/are the indications for the use of a maxillary palatal plate
major connector which is composed partly of metal and partly of
plastic? See example to the right.
Click on button 1 for the answer.
Question 176
Fill in the blank
What are the indications for the use of a maxillary horseshoe
major connector?
Click on button 1 for the answer.
Question 177
Fill in the blank
The total retention for a RPD is obtained from
Click on button 1 for the answer
Question 178
Fill in the blank
What are the components of a clasp assembly?
Click on button 1 for the answer
Question 179
Fill in the blank
An ideal clasp assembly should possess the following qualities:
Click on button 1 for the answer
Question 180
SUPPORT for a RPD framework is provided by?
Click on button 1 for the answer
Questions 181-190
Question #181
Fill in the blank
Explain the difference between bracing and reciprocation.
Click on button 1 for the answer
Question 182
Fill in the blank
Factors important in the selection of a particular clasp design include?
Click on button 1 for the answer.
Question 183
Fill in the blank
What are indirect retainers and how do they function?
Click on button 1 for the answer.
Question 184
Fill in the blank
______________________________ are mechanical retainers that originate from a point at or
above the height of contour---usually from a rest, minor connector, or guide plate---and angle
downward across the clinical crown where the tip is located in the prescribed undercut.
Click on button 1 for the answer
Question 185
For a circumferential clasp, the undercut must be located
on the same side of the abutment as the point of origin.
on the opposite side of the point of origin.
Question 186
Fill in the blank
What is a combination clasp?
Click on button 1 for the answer.
Question 187
Fill in the blank
When is a combination clasp most commonly used?
Click on button 1 for the answer.
Question 188
Fill in the blank
What is the "RPA" clasp concept and what is the problem with the design?
Click on button 1 for the answer.
Question 189
Fill in the blank
What is the name of the clasp assembly shown to the right?
Click on button 1 for the answer.
Question 190
Fill in the blank
What is the most significant error in the design shown to the right. (Hint:
the error is not particularly easy to see but it involves the major
connector.)
Click on button 1 for the answer.
Questions 191-200
Question #191
Fill in the blank
The illustration shown to the right was taken from an advertisement that
appeared in one of the dental journals. It suggests that a bar bridge/splint in
combination with a precision or semi-precision removable partial denture is appropriate
treatment for "Geriatric Reconstruction." What do you think about this type of treatment?
Click on button 1 for the answer.
Question #192
Fill in the blank
The illustration to the right shows the tissue surface of a maxillary
removable partial denture. The arrows point to the junction of the
framework metal and the plastic denture base. What is this structure called?
Click on button 1 for the answer.
Question #193
Fill in the blank
The illustration to the right shows a tooth-supported segment of a mandibular removable partial
denture framework. The red arrow is pointing to the raised edge of metal where the framework
and plastic denture base will meet. What is this structure called?
Click on button 1 for the answer.
Question #194
Fill in the blank
The illustration to the right shows a maxillary class I RPD framework with
an anterior-posterior palatal strap major connector. What is the minimum acceptable distance
between the anterior and posterior straps (red arrow)?
Click on button 1 for the answer.
Question #195
Fill in the blank
What Kennedy classification is the RPD shown in the picture to the
right? What is the name of this type of major connector?
Click on button 1 for the answer.
Question #196
Fill in the blank
What is the Kennedy classification of the maxillary RPD shown to the
right?
Click on button 1 for the answer.
Question #197
Fill in the blank
What is the Kennedy classification of the maxillary RPD shown to the right?
Click on button 1 for the answer.
Question #198
Fill in the blank
The red arrows point to a "ridge" of metal on the framework where the
framework and the denture base plastic will meet. What is this "ridge" called?
Click on button 1 for the answer.
Question #199
Fill in the blank
The illustration to the right shows a tooth-borne segment of a
mandibular RPD. There is an I-bar retainer on the molar abutment. What is unusual about this
retainer?
Click on button 1 for the answer.
Question #200
Fill in the blank
The illustrations above show a very large maxillary RPD and a close-up of one of the retentive
arms. What type of retentive arms have been used on this prosthesis?
Click on button 1 for the answer.