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 and 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 RPD’s?
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
The proximal plate adjusted before rest seat. S-curved survey line, is for retentive, NOT reciprocal:
T/F
Both statements are true
Fabrication of RPD framework is performed on:
Master cast
Which function of major connector disperses lateral forces?
Cross-arch stabilization
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
(True/False)
Co-Cr is used at UMKC. Co-Cr is more commonly used die to nickel sensitivity/
Both statements true
Proximal 2/3 of reciprocal clasps 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 perpendicular to occlusal plane
Kennedy classification with no modifications:
Class IV
Terminal 1/3 of the retentive clasp 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 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 cast?
DF undercut
(True/False):
As the length of the guiding plane increases, frictional retention is increased. When length is increased, resistance to rotation is increased.
Both statements true
You have a #19, #22, #23, #24, and #35 missing, what classification?
Kennedy class III mod 1
What is the classification for B/L distal extension?
Class I
The 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:
Position of primary rests
True/False): 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
Tooth that supports prosthesis is called:
Abutment
Least rigid major connector:
Horsehoe (U-shaped)
Which statement about the principle of encirclement is false?
RPI does satisfy it
“long” guiding planes length (tooth-supported RPD):
3-4 mm
“short” guiding planes length (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 relief in tooth-tissue supported RPDs:
RPI
What tooth do we use a composite cingulum rest & why?
Mandibular canine; due to thinner enamel
A patient presents with all maxillary teeth. Which doe not contribute to Kennedy classification?
Presence of Tori
Which of the following g is not acceptable terminology?
Flipper
In applegate, the most _____ edentulous area ______ determines classification
posterior; always
(True/False):
Tilting the cast changes the HOC. You use the tip of a carbon marker to mark the HOC.
True; false- you 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
(True/False):
Looking from the occlusal, it is idea to preserve the round structure of the tooth. The rest should be 1/2 distance between tips.
True; True
What component of the framework is rigid and lies above the survey line?
Reciprocal clasp
(True/False):
You should 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 mesial-distal width in some cases
d) all of the above
d) All of the above
(True/False):
You should use an altered cast technique on Class I and III:
False
what is the rigid component preventing gingival movement down?
Rest (NOT the rest seat)
Which is entirely above the height of contour tour?
Reciprocal arm
The reciprocal arm is ____ middle 1/3 an ____ gingival 1/3
above; above
What Kennedy class does not have modifications?
Class IV
Which would not be included in a 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
(True/False):
A class II RPD does not have rotational forces across midline structure
False
A lingual plate cannot be used when:
anterior crowding
(True/False): the retentive heigh of contour should have an S-shape
True
If you have tissue undercuts, what type of clasp should be used?
Circumferential clasp
What is the width of the anterior-posterior strap
6-8 mm
What teeth & why would you add composite for a cingulum rest?
Mandibular canine; bc not enough enamel
What is the needed reduction over the marginal ridge of a rest seat?
1-1.5 mm
What undercut is needed for a circumferential clasp?
.01 inches
What joins the denture base to other components of the RPD?
Minor connector
What type of lever is an RPI?
Class II
List the order of surveying a cast:
- guide planes
- re-survery
- rest seats
What word do we not call a partial removable denture?
Flipper
In class III RPDs what type of major connector is used?
Palatal strap
What is not a type of major connector used on the maxillary arch?
Lingual bar
what is the disadvantage to a horseshoe (U-shaped) major connector?
NOT rigid
In the adjusted cast design, which of ht following is removed from the original master cast?
Distal edentulous areas
In the RPI, the I-bar moves ____ when the patient bite down on the distal extension part
down & mesial
The “pod” refers 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 BL length, 1/2 width cusp tip to cusp tip, its okay to extend more than 1/2 the length MD)
RPI acts a s _______ lever
Class II
(True/False): When looking from the occlusion, it is ideal to preserve the round structure of the tooth, and the guide plane should be 1/2 width from cusp tip to cusp tip
True; True
In a tooth-tissue-supported RPD, what is the length of the guide plane?
1.5-2 mm
In a tooth-supported RPD, what is the length of a 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 & 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:
Kennedy 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:
Minor connector
