TQ Flashcards
What is the external finish line?
external junction of the framework to the plastic denture base
When biting down, the I-bar moves in what direction?
mesial & down
Tissue undercut can prevent selection of:
a) suprabulge
b) infrabulge
c) minor connector
infrabulge
Which of the following major connectors is NOT used in a 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 inches
T/F: The proximal plate is adjusted before the rest seat. S-curved survey line is for retentive, not reciprocal
Both statements true
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
T/F: Co-Cr is used at UMKC. Co-Cr is more commonly used to nickel sensitivity.
Both statements 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?
want cast to be perpenidicular to the occlusal plane
Kennedy classification with NO modifications:
Class IV
Terminal 1/3 of retentive clasps is where on abutment tooth?
gingival 1/3
What does NOT apply to guiding planes?
Never use an occlusal rest on mesially tilted mandibular molars for rest seats
fabrication of the RPD framework is performed on:
master cast
what is the pod?
part of the I-bar that contacts the 0.01” undercut
What do you remove on alternative/altered cast?
distal extensions
What is drawn in red on the cast?
Undercuts
Where can you NOT put an I-bar clasp?
DF undercut
T/F: 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 a #19, #22, #23, #24, and #25 missing, what classification?
Kennedy class III mod 1
What is the classification for a B/L distal extension?
Class I
T/F: Borders for lingual bar 3-4 from the free gingival margin. The distance best measured on the cast.
True; False- distance should be measured in the mouth
Axis of rotations are determined by:
positions of primary rests
T/F: 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- There is functional movement and axis of rotation
The tooth that supports prosthesis is called:
abutment
Least rigid major connector:
horseshoe (U-shaped)
Which statement about the principle of encirclement is false?
RPI doesn’t satisfy it
“long” guiding planes length (tooth-supported RPD)
3-4 mm
“short” guiding planes length (tooth-tissue supported RPD)
1.5 mm
Which of the following is NOT required for clasp assembly?
- stability
- reciprocation
- retention
None of them- all of them are required
The best clasp choice for stress receive in tooth-tissue supported RPDs?
RPI
What tooth do we use a composite cingulum rest and why?
mandibular canine due to thiner enamel
A patient present with all maxillary teeth. Which does not contribute to Kennedy classification?
presence of tori
Which of the following is not acceptable terminology?
flipper
In applegate, the most ___ edentulous area ____ determines the calssificaiton
posterior; always
T/F: Tilting the cast changes the HOC. You use the tip of the carbon marker to mark the HOC.
True; false- should use the side of the carbon marker
RPI clasp is what type of lever?
Class II
When is a lingual plate major connector NOT indicated?
anterior crowding
What connects the major connector to other pieces of the framework?
minor connector
T/F: Looking from the occlusal, it is ideal to preserve the round structure of the tooth. The rest should be 1/2 the distance between cusp tips.
Both true
What component of the framework is RIGID and lies above the survey line?
reciprocal clasp
T/F: You would use the altered cast technique on class I and III RPD designs:
False- should be class I and II
Which of the following is true concerning guiding planes?
A- as wide as 1/2 the distance between cusp tips
B- 1/3 the buck-lingual width of the tooth
C- can be extended further than 1/2 the medial-distal width in some cases
D- All of the above
D- all of the above
You should use altered cast technique on class I and III:
false
What is the RIGID component preventing gingival movement DOWN:
Rest (not rest seat)
Which is entirely above the height of contour:
reciprocal arm
The reciprocal arm is ____ middle 1/3 and ____ gingival 1/3
above; above
What Kennedy class does NOT have modifications?
Class IV
Which would not be included in classification/modification?
Torus
You make the final metal RPD component on:
master cast
You want the path of insertion to be:
perpendicular to the occlusal plane
A class II RPD does not have rotation forces across midline suture:
false
A lingual plate can’t be used when there is:
anterior crowding
The retentive height of contour should have S-shape:
true
If you have tissue undercuts, what clasp type should be used?
circumferential
The width of the anterior-posterior palatal strap:
6-8 mm
What teeth and why do you add composite on for a cingulum rest?
Mandibular canine because not enough enamel
Reduction needed over the marginal ridge of a rest seat:
1.0-1.5 mm
What undercut is needed for circumferential clasp?
0.01 inches
What joins the denture base with another thing?
minor connector
What type of lever is an RPI?
Class II
List the order of surveying a cast:
- guiding planes
- re-survey
- rest seats
What word do we not called a partial removable denture?
flipper
In class III RPDs, what type of major connector is used?
palatal strap
What is not a major connector in the maxillary?
lingual bar
What is the disadvantage of a horseshoe (u-shaped) major connector?
Not rigid
In the adjusted cast design, which of the following is removed from the original master cast?
Distal edentulous areas
In an RPI design, the I bar moves ___ when a patient bites down on the distal extension part:
down and mesial
The “pod” referes to:
I-bar engaging 0.01” undercut
All of the following are true about rests except:
NEVER put a rest on a mesially inclined molar
(what is true- 1/3 buccal-lingual length; 1/2 width from cusp tip to cusp tip; In some cases, it is okay to extend more than 1/2 the length mesial-distally)
RPI acts as a ____ lever
class II
T/F :When looking from occlusion, it is ideal to preserve the round structure of the tooth, and the guide plane should be 1/2 the width from cusp tip to cusp tip?
Both true
In a tooth-tissue supported RPD, what is the length of the guide plane?
1.5-2.0 mm
In a tooth supported RPD, what is the length of the guide plane?
3-4 mm
Which is marked in red during diagnostic cast design?
Retentive undercut
bracing elements on one side of the arch, providing stability on the other side:
Cross-arch stabilization (counter leverage)
The connecting link between the major connector or base of the RPD and other units of the prosthesis such as direct & indirect retainers and rests:
minor connector
Do rests provide retention?
NO- they transfer forces down the long axis of the abutment tooth
What is the main retention of the prosthesis?
direct retainers
Prevents vertical displacement of the distal extension denture base:
Indirect retainers
Indirect retainers are ALWAYS necessary in:
Ken Class I and II
Indirect retainers should be located:
perpendicular to the fulcrum line, as far away as possible
Prevents the movement of the RPD towards the tissues:
indirect retainers
The proximal plate of the RPD is considered:
A minor connector
