Midterm Study Guide Flashcards
What is the external finish line?
External junction of the framework to plastic denture base
When biting down the I bar moves in what direction?
Mesial and down
Tissue undercut can prevent selection of (supra, infra, minor connector)
Infrabulge
Which of the following major connectors is not used in maxillary arch?
Lingual Bar
What is the most commonly used major connector for class III RPDs?
Palatal Strap
Width of straps used in AP major connector?
6-8 mm
Depth of marginal ridge in rest seat?
1-1.5 mm
Undercut for a cast chromium clasp?
0.01”
Proximal plate adjusted before rest seat. S curved survey line for retentive not reciprocal
BOTH true
Fabrication of RPD framework is done on what?
Master Cast
Which function of major connectors disperses lateral forces?
Cross arch stabilization
What RPD component transfers forces down the long axis?
Rest
Order of tooth modifications?
Guide planes, survey line adjustment, rest seat
Co-Cr used at UMKC. Co-Cr used more than Ni because of allergies.
BOTH true
Proximal 2/3 of reciprocal clasp in ______, terminal 1/3 of reciprocal clasp in _____
Middle, Middle
Why do we not want excessive tilt to the cast when surveying?
We want cast to be perpendicular to occlusal plane
Kennedy classification with no modifications
Class IV
Terminal 1/3 of retentive clasps is where on the abutment tooth?
Gingival 1/3
What does NOT apply to guiding planes?
NEVER use an occlusal rest on a mesially tilted mandibular molars for rest seats
What is the pod?
Part of the I bar in that contacts the 0.01” undercut
What do you remove on an alternative/altered cast?
Distal extensions
What is drawn in red on a cast?
Undercuts
Where can you NOT put an I bar clasp
DF undercut (you CAN on MF and mid-F undercuts)
As the length of the guiding plane increases, frictional retention is increased. When length is increased, resistance to rotation is increased.
BOTH true
You have #19,22,23,24,25 missing. What classification is it?
Class III Mod 1
What classification is a bilateral distal extension?
Class I
Borders for lingual bar 3-4 from the free gingival margin. This distance best measured on cast
True, False (measured in mouth)
Axis of rotations determined from?
Line drawn through primary rests
There is no axis of rotation in a Kennedy Class II RPD because there is no functional movement across the median suture in the maxilla.
False,
Tooth that supports prosthesis is called?
Abutment
Least rigid major connector
Horseshoe (“U-shaped”)
Which statement about principle of encirclement is FALSE
RPI doesn’t satisfy it (It DOES have encirclement)
“long” guiding planes length (tooth-supported RPD)
3-4 mm
“short” guiding planes length (tooth-tissue supported RPD)
1.5-2 mm
Which is not required for clasp assembly?
NONE (all are required: stability, retention, reciprocation)
Best clasp choice for stress relief in tooth-tissue supported RPDs
RPI
What tooth do we use a composite cingulum rest and why?
mandibular canine
A patient presents with all maxillary teeth. Which does not contribute to Kennedy classification?
Presence of tori
Which is not acceptable dental terminology?
flipper
In Applegate, the most _____ edentulous area ______ determines classification.
Posterior, always
Tilting the cast changes the HOC. You use the tip of carbon marker to mark the HOC.
True, false
RPI clasp is what type of lever
Class II
When is lingual plate major connector NOT indicated?
Anterior crowding
What connects major connector to other pieces of the framework?
minor connector
looking from the occlusal, it is ideal to preserve the round structure of the tooth. The rest should be 1/2 distance between cusp tips.
true, true
What component of the framework is rigid and lies above the survey line?
reciprocal clasp
You would use the altered cast technique on Class I and III RPD designs
False (only for class I and II)
Which of the following is true concerning guiding planes?
-As wide as ½ the distance between cusp tips
-1/3 the bucco-lingual width of the tooth
-Can be extended further than ½ the mesial-distal width in some cases
All of the above**
Which of the following RPD components do NOT provide retention?
Rests
Which of the following RPD components contribute to support?
All of the above (rest, major connector, denture base)
Which term is defined as “Resistance to horizontal, lateral, or torsional forces”
Stability
Which of the following statements are true
RPD’s true reciprocation can only be achieved if the reciprocating element touches the tooth at the same time or before the retentive clasp
Which of the most detrimental lever class
Class I
Which of the following is true?
ALL OF THE BELOW
a. The completed RPD must be passive
b. Should not exert forces on the teeth or soft tissue
c. The tip of each retentive clasp should lie passively in a measured undercut
d. A and B are correct
Given an image of the mandible. What is this Kennedy’s Classification
Class 2 mod 2
A surveyed crown are indicated when
ALL THE BELOW
a. The survey line is in the gingival 1/3
b. No undercuts exists on abutment teeth
c. With the help of enameloplasty, one cannot have the changes necessary for
the abutment teeth without cutting into dentin
Maximum tilt when surveying
10 degrees
Tooth contouring (i.e. survey lines) should be done_______ the survey crown is made
Before
What component of the RPD joins the minor connector and their attached assemblies together to form a solid unit
Major Connector
The primary reason for beading of the maxillary cast is
Prevents ingress of air
Primary purpose of direct retainer
Retention
example of infrabulge
I bar
The most common clasp used for a Tooth-supported RPD is
Circumferential
Which clasp is located in the middle 1/3 of the tooth and does not taper
Reciprocal
