CDT Partial Dentures Test Questions and Answers Rated A+
Which component of a Removable Partial Denture provides retention? - Answers Clasps
Which is the purpose of a surveyor? - Answers Identifies height of contour
Which is a major connector? - Answers Open or closed horseshoe
Which is a minor connector? - Answers Connection between major connector and clasp.
Where a properly constructed lingual bar is not possible due to its encroachment on the 4mm distance
from the gingival tissues, a _______ is an excellent alternative. - Answers Kennedy Bar
A clasp should provide - Answers Retention and Reciprocation
Which is a key factor in a successful RPD pattern construction? - Answers Use pliable preformed parts
that readily conform to surfaces of the refractory cast.
A general guideline for placing a rest is? - Answers Rests are almost always placed on teeth adjacent to
edentulous spaces because that is where support requirements are greatest.
Before processing a denture base - Answers Wax seal the denture base to the cast.
Tooth-borne - Answers c
Bilateral anterior extension - Answers d
Unilateral distal extension - Answers b
Bilateral distal extension - Answers a
Requires tooth and tissue support - Answers a, b, d
Requires tooth support only - Answers c
How is the Kennedy classification determined? - Answers By the most posterior edentulous area.
What is a modification to the Kennedy classification? - Answers A modification is any edentulous area
anterior to the most posterior edentulous area.
How does a Class IV arch differ from a Class III arch? - Answers The anterior edentulous area must cross
the midline to be classified as a Class IV
What is a fulcrum line? - Answers It is an imaginary line around which a removable partial denture could
rotate.
How is rotation around the fulcrum line neutralized? - Answers By using rests, direct retention, and
supporting tissues
, Describe the type of support needed for Class I, II, III, IV cases. - Answers Kennedy Class I, II, and IV RPD's
require tooth and tissue support for stabilization, while Class III requires only tooth support.
Why should a cast circumferential clasp never engage the mesiobuccal undercut on a Class I case? -
Answers Because with this design, the clasp will act as a lever and actually lift the abutment tooth out of
the socket.
During RPD design, when is double clasping an acceptable design practice? - Answers Only when there is
insufficient bone support for the abutment tooth.
Why are clasps on the edentulous side of a Class II case placed as far anteriorly and posteriorly as
possible? - Answers To ensure stability of the RPD.
What is the purpose of the major connector in a RPD? - Answers The major connector acts as a skeleton
connecting one side of the partial to the other.
What structural quality allows a major connector to distribute and equalize stress? - Answers With its
rigidity and resistance to torque.
How could a defective major connector affect a patient's oral health? - Answers At best, the connector is
uncomfortable; at worst, the connector destroys teeth and the periodontium.
Why should the major connector cover as little of the patient's tissue as possible? - Answers It allows
tissue stimulation, and flavor, temperature, and salivation are not inhibited.
How can a major connector be designed to be less annoying to a patient? - Answers By avoiding convex
surfaces. Existing depressions and embrasures are used for the component.
What are two anatomical features that interfere with the major connector ability to distribute stress? -
Answers Thick or flaccid soft tissue and bony prominences.
Why should the major connector cross the median raphe at a 90 degree angle? - Answers It provides
cross-arch strength and is less distracting to the patient's tongue.
How does a patient's oral structure increase a major connector's rigidity? - Answers The major
connector adapts to the tissue on several planes, increasing rigidity.
How does the rest framework component distribute functional stress to the oral structures to
adequately support the RPD? - Answers Along the long axis of the abutment tooth.
What is the purpose of retention? - Answers To prevent the dislodgment of the RPD.
What is the desired state of the direct retainer when the RPD is seated? - Answers It should be passive
(at rest) until activated by a dislodging force.
What is the purpose of the denture base? - Answers It supports artificial teeth, improves the patient's
appearance by replacing the missing tissue, distributes occlusal stress, and stimulates supporting tissue.
Which component of a Removable Partial Denture provides retention? - Answers Clasps
Which is the purpose of a surveyor? - Answers Identifies height of contour
Which is a major connector? - Answers Open or closed horseshoe
Which is a minor connector? - Answers Connection between major connector and clasp.
Where a properly constructed lingual bar is not possible due to its encroachment on the 4mm distance
from the gingival tissues, a _______ is an excellent alternative. - Answers Kennedy Bar
A clasp should provide - Answers Retention and Reciprocation
Which is a key factor in a successful RPD pattern construction? - Answers Use pliable preformed parts
that readily conform to surfaces of the refractory cast.
A general guideline for placing a rest is? - Answers Rests are almost always placed on teeth adjacent to
edentulous spaces because that is where support requirements are greatest.
Before processing a denture base - Answers Wax seal the denture base to the cast.
Tooth-borne - Answers c
Bilateral anterior extension - Answers d
Unilateral distal extension - Answers b
Bilateral distal extension - Answers a
Requires tooth and tissue support - Answers a, b, d
Requires tooth support only - Answers c
How is the Kennedy classification determined? - Answers By the most posterior edentulous area.
What is a modification to the Kennedy classification? - Answers A modification is any edentulous area
anterior to the most posterior edentulous area.
How does a Class IV arch differ from a Class III arch? - Answers The anterior edentulous area must cross
the midline to be classified as a Class IV
What is a fulcrum line? - Answers It is an imaginary line around which a removable partial denture could
rotate.
How is rotation around the fulcrum line neutralized? - Answers By using rests, direct retention, and
supporting tissues
, Describe the type of support needed for Class I, II, III, IV cases. - Answers Kennedy Class I, II, and IV RPD's
require tooth and tissue support for stabilization, while Class III requires only tooth support.
Why should a cast circumferential clasp never engage the mesiobuccal undercut on a Class I case? -
Answers Because with this design, the clasp will act as a lever and actually lift the abutment tooth out of
the socket.
During RPD design, when is double clasping an acceptable design practice? - Answers Only when there is
insufficient bone support for the abutment tooth.
Why are clasps on the edentulous side of a Class II case placed as far anteriorly and posteriorly as
possible? - Answers To ensure stability of the RPD.
What is the purpose of the major connector in a RPD? - Answers The major connector acts as a skeleton
connecting one side of the partial to the other.
What structural quality allows a major connector to distribute and equalize stress? - Answers With its
rigidity and resistance to torque.
How could a defective major connector affect a patient's oral health? - Answers At best, the connector is
uncomfortable; at worst, the connector destroys teeth and the periodontium.
Why should the major connector cover as little of the patient's tissue as possible? - Answers It allows
tissue stimulation, and flavor, temperature, and salivation are not inhibited.
How can a major connector be designed to be less annoying to a patient? - Answers By avoiding convex
surfaces. Existing depressions and embrasures are used for the component.
What are two anatomical features that interfere with the major connector ability to distribute stress? -
Answers Thick or flaccid soft tissue and bony prominences.
Why should the major connector cross the median raphe at a 90 degree angle? - Answers It provides
cross-arch strength and is less distracting to the patient's tongue.
How does a patient's oral structure increase a major connector's rigidity? - Answers The major
connector adapts to the tissue on several planes, increasing rigidity.
How does the rest framework component distribute functional stress to the oral structures to
adequately support the RPD? - Answers Along the long axis of the abutment tooth.
What is the purpose of retention? - Answers To prevent the dislodgment of the RPD.
What is the desired state of the direct retainer when the RPD is seated? - Answers It should be passive
(at rest) until activated by a dislodging force.
What is the purpose of the denture base? - Answers It supports artificial teeth, improves the patient's
appearance by replacing the missing tissue, distributes occlusal stress, and stimulates supporting tissue.
