Practice Test Flashcards
If a patient has one side of their arch supported by the residual ridge and the other supported by natural dentition, what classification are they?
Unilateral tooth-tissue supported RPD
If a patient is missing her 4 maxillary incisors and has a severely resorbed edentulous ridge, what would you recommend for a treatment plan?
Removable Partial Denture
The reciprocating arm of a supra-bulge clasp is located
In the middle 1/3
When surveying a cast, the maximum tilt that is acceptable is
10 degrees
A component of a RPD that serves to transfer forces occurring against the prosthesis down the long axis of the abutment tooth and prevent tissue-ward movement of the RPD is
Rest
Which of the following is false concerning Indirect Retainers
Most commonly in the form of a MO rest on a 1st molar
The purpose of tripoding the cast is to
Record the cast position to the surveyor
Path of insertion is determined by all of the following EXCEPT::
Guiding planes Retentive Undercuts Occlusion Interferences Esthetics
Occlusion
A surveyed crown are indicated when
- The survey line is in the gingival 1/3
- No undercuts exists on abutment teeth
- With the help of enameloplasty, one cannot have the changes necessary for the abutment teeth without cutting into dentin
- All of the above are true
-All of the above are true
The amount of undercut varies depending on the clasp type. How many inches of undercut is used for a Cr-Co or Ni-Cr cast clasp is
0.01 “
The order of performing tooth modifications within the mouth are
Guide planes, Survey line reposition, Rest
You should decide what type of clasp to use after
Surveying the cast
Vertically parallel surfaces of abutment teeth oriented to contribute to the direction of the path of insertion and dislodgment of a RPD during insertion and removal is called
Guiding planes
The terminal 1/3 of a retentive clasp arm in a tooth-tissue borne RPD should be located
Gingival 1/3
Picture of a maxillary arch: The patient is missing tooth #12, 13, 14, 15 but has retained tooth #16. What is the classification?
Class 3
Which of the following is true concerning Kennedy’s classification?
Edentulous areas other than those that determine the classification are referred to as modifications and are designated by their number
The extent of the modification is not considered, only the number of additional edentulous areas is considered
Both of the above are true
Both of the above are true
Which Kennedy’s classification is it not possible to have modification areas?
class 4
Which of the following is true concerning guiding planes
As wide as the widest portion of the occlusal rest
1/3 the bucco-lingual width of the tooth
1/2 the distance between the cusp tips
All of the following are true
All of the above
The length of guiding planes in a tooth-tissue supported abutments should be
1.5-2.0 mm
The length of guiding planes in a tooth supported abutments should be
3-4 mm
Borders for a maxillary major connectors should be placed ________ mm from the gingival margin
6 mm
The primary purpose of a posterior palatal seal for the maxillary major connectors is to
Prevent the ingress of air and food underneath the denture
Which of the components of a RPD are not rigid
(A AND B ARE RIGHT)
Approaching arm of I-bar
Terminal 1/3 of the retentive arm
A facebow transfer of a diagnostic cast for planning an RPD helps with:
`
(A AND B ARE RIGHT)
More accurate arc of closure
More accurate occlusion
Which clasp is indicated when the patient is concerned about esthetics?
I-Bar
Why choose cingulum rest over incisal edge
Less leverage on the tooth
The amount of space needed from the floor of the mouth to the free gingival margin for a lingual bar is
7-9 mm
A lingual plate is indicated for all of the following EXCEPT?
Severely anterior crowding
`
The ____________ component of an RPD joins the major connector to the clasp assembly and indirect retainers
Minor Connector
In a suprabulge clasp type, the retentive arm approaches the undercut from
Above the survey line
The first choice of clasp for a distal-extension RPD is
RPI
Examples of Tooth-tissue supported RPDs are
(A AND B ARE RIGHT)
Class 1
Class 2
The most common cause of rest fracture is due to
Inadequate rest seat reduction
The primary function of an occlusal rest is to
Direct forces down the long axis of the tooth
The primary-design quality of the occlusal rest would categorize it as a + rest seat is
Forms an acute angle with the minor connectors that connect them to the major connectors
Which teeth can be prepared with a lingual rest seat (does not require the addition of composite)?
Maxillary canine
The altered cast procedure is used to
Ensure support for the RPD
The altered cast procedures requires all of the following EXCEPT
Placement of pressure on the distal extension
If a patient has numerous teeth with harmonious occlusion, casts can be mounted
In MIP
All of the following are the disadvantages of the bar (infra-bulge) clasp EXCEPT one. Which is the exception?
Less Flexible
The only major connector that should not be used in the maxillary arch is
Lingual bar
The major connector most commonly used for class III RPDs
Palatal strap
The width of the straps used in A-P
6-8 mm
Depth of marginal ridge in rest seat
1- 1.5 mm
Proximal plate needs to be adjusted before rest seat. You want the S curved survey line in the retentive arm, not the reciprocal arm
both true
Fabrication of RPD framework
Master cast
Lateral forces are what function
Cross arch stabilization
t/f: Rests transfer forces down long axis
true
Order of reduction
Guide planes, survey line adjustment, rest seats
You want guide planes to wrap around to lingual in RPI. There should be sluiceway through the facial in RPI on the mesial rest
true then false
Cast circumferential undercut
0.01 “
Co-Cr is used in UMKC clinic. Co-Cr used more than Ni-Cr because of nickel allergy
true
t/f: Reciprocal clasp is rigid and above the survey line
true
The proximal 2/3 of reciprocal is in the ___ and the terminal 1/3 of the reciprocal is in the ___
middle
middle
Don’t want excessive tilt to the cast –why
You want the cast to be perpendicular to the occlusal plane
Kennedy classification with no mods
Class IV
Terminal 1/3 of retentive clasp is in the
Gingival 1/3
Which one does not apply to guiding planes
NEVER use mesially tilted mandibular molars for rest seat
Alternative cast method you remove
The distal extensions
Which of the following is drawn in red
undercut
For an I bar, you cannot use which of the following in a distal extension case
DF
Width of guiding plane in tooth-tissue
1.5-2 mm
Width of guiding plane in tooth-tooth
3-4 mm
The pod of the I bar in a 0.01” undercut
The 2mm area that touches the undercut
As length of the guiding plane is increased, frictional retention increases. As the length increases, resistance retention increases
true
true
You have 19, 22, 23, 24, 25 missing – what is kennedy classification
Class III mod 1
Bilateral distal extension is what classification
Class I
Borders for lingual plate should be 3-4 from the gingival margin. Depth of floor of mouth is best determined by the cast
true then false
When do we not use the lingual plate
Severe anterior crowding
Which of the following are required for clasp assembly
Support, resistance, retention
Which major connector is the least rigid
Horseshoe
Which tooth is the composite cingulum rest seat placed on
Mandibular canine due to thinner enamel
What is the most common stress relief in distal extension cases
RPI
Pt with all maxillary teeth, which will not contribute to Kennedy classification
tori
Which of the following isn’t true about the principle of encirclement
The RPI doesn’t satisfy it
In CR, the condyle contacts the thinner, ___ part of the disc and is in the most ____ position
Avascular, anterior superior
The retentive arm is on the buccal of the maxillary teeth. This is due to the curve of spee
true, false
When viewed from the facial, when pt bites down on the distal extension area, what direction does the RPI move
Downward and mesially
What is not dental terminology
flipper
In Applegate’s rules, the most __ edentulous area ___ determines classification
posterior always
t/f: It is more desirable to keep the rounded contour from the occlusal
true
Tilting the cast changes the HOC. You use the tip of the carbon marker to mark the survey line
true, false
RPI clasp is what type of lever
class II
- External finish line?
a. Framework to denture base
- When biting down I bar moves (mesial, down, up)
a. Mesial and down
tissue undercut can prevent selection of (supra, infra, minor connector)
a. Infra bulge
- Only major connector not used in maxillary arch
a. Lingual bar
- Most commonly used for class 3 RPD
a. Palatal strap
- Width of straps used in AP
a. 6-8 mm
- Depth of marginal ridge in rest seat
a. 1-1.5
- Undercut for a chromium thing
a. 0.01 inches
- Proximal plate adjusted before rest seat. S curved survey line for retentive not reciprocal
a. True, true
- Fabrication of RPD framework
a. Master cast
- Lateral forces
a. Cross arch stabilization
- Transfer forces down long axis
a. Rest
- Order of reduction
a. Guide planes, survey line adjustment, rest seat
- Co-Cr used at UMKC. Co-Cr used more than Ni because of allergies
a. True, true
- Proximal 2/3 of reciprocal in ______, terminal 1/3 of reciprocal in ______
a. Middle, middle
- Don’t want excessive tilt to the cast
a. Want cast to be perpendicular to occlusal plane
- Kennedy classification with no modifications
a. 4
- Terminal 1/3 of retentive clasps
a. Gingival 1/3
- Does NOT apply to guiding planes
a. Never use mesially tilted mandibular molars for rest seats
- Alternative cast what do you remove
a. Distal extensions
- What do you use for alternative cast method
a. 1 and 2
- What’s in red
a. Undercut
- Where can you not put I bar
a. DF
- As length of guiding plane increases ________
frictional retention and resistance increases
- You have 19,22,23,24,25 missing. What classification is it?
a. Kennedy class 3 mod 1
- Bilateral distal extension
a. Class 1
- Borders for lingual bar 3-4 from GM. Distance best measured on cast
a. True, false
- Axis of rotations measured from
a. Rest
- Kennedy class 2 there is no axis of rotation something about median suture in max
a. False
- Tooth that supports prosthesis
a. Abutment
- Least rigid connector
a. Horseshoe
- Isn’t true about principle of encirclement
a. RPI doesn’t satisfy it
- “long” guiding planes
a. 3-4 mm
- “short” guiding planes`
a. 1.5 mm
- Required for clasp assembly
a. Stability, reciprocation, retention
- Best clasp choice for stress relief
a. RPI
- Composite cingulum
a. Mandibular canine due to thinner enamel
- Pt with all maxillary teeth, not contribute to kennedy
a. Torus
- Not dental terminology
a. Flipper
- In applegate, most _____ edentulous area ______ determines classification
a. Posterior, always
- Tilting the cast changes the HOC. You use the tip of carbon marker
a. True, false
- RPI clasp is what type of lever
a. Class 2
- The order of performing tooth modification within the mouth are
a. Guide planes, survey line reposition, rest
- When is lingual plate NOT indicated?
a. Anterior crowding
- Connects major connector to other pieces
a. Minor connector
- You want to keep occlusal contour original rounded. Rest should be ½ distance between cusp tips
true true
You use altered cast technique on class I and III
• FALSE
