Mouth preparation for removable partial denture & Class I Kennedy classification l Removable prosthodontics MCQs
MCQ on Mouth preparation for RPD & Class I kennedy classifications for removable partial prosthodontics
For the preparation of the rest seat the marginal ridge of a molar tooth is reduced by 2mm to achieve the correct depth of the rest seat. The marginal ridge is then rounded in order to:
A.
Reduce the chances of fracture f the metal rest
B.
Decrease food impaction
c.
for the better distribution of the vertical load
d.
better clasp retention
The 1" step in the alteration of the abutment teeth contour in the natural toot preparation for the RPD is
A.
Preparation of the occlusal rest seat
B.
Disking of the proximal surfaces, parallel to the path of insertion
C.
Cutting a retentive undercut on the facial surface if needed
D.
Decreasing the height of contour to the gingival one third on the abutment
tooth
A tooth which has not been in function and is now being used as an abutment may become symptomatic. This most likely results from:
A.
Overstress
B.
Pulpal reaction
C.
Localized osteoclastic activity
D.
Reaction within periodontal ligament
The most effective means of limiting applied loads to abutment teeth in a distal extension partial denture is by:
A.
Using a stress breaker
B.
Using acrylic replacement teeth
C.
Splinting abutments to adjacent teeth
D.
Maintaining a stable base - tissue relationship
Modification space in Kennedy classification represents?
A.
Bilateral edentulous areas located posterior to the remaining natural teeth
B.
Unilateral edentulous area located posterior to the remaining natural teeth
C.
Edentulous areas other than those determining the classification
D.
Bilateral edentulous area located anterior to the remaining natural teeth
The guiding plane serve which of the following function:
.
a. Facilitate insertion and removal of prosthesis
b.
Minimizes the wedging stress on the abutment
c.
Stabilizes the prosthesis horizontally
d.
All of the above
Which is not true for guiding plane:
a.
Guiding plane reduce undercuts between the proximal tooth surface and the minor
connector
b.
A properly prepared guiding plane increases the height of contour of proximal
surface of tooth
c.
Guiding plane aids in stabilizing the individual teeth
d.
None of the above
The ideal occlusogingival height for preparing guiding planes on the proximal or lingual surfaces of the abutment tooth should be:
a.
0.5 to 1 mm
b.
1 to 1.5 mm
c.
2 to 4 mm
d.
5 to 7 mm
The process of preparing a small indentation in the enamel of tooth surface into which a retentive clasp can be placed is known as:
a.
Pickling
b.
Dimpling
c.
Enameloplasty
d.
None of the above
Which of the following is a function of rest seat:
a.
To direct the forces of mastication vertically down
b.
To maintain the clasp in a surveyed position
c.
Prevention of gingival displacement of the denture
d.
All of the above
In the construction of partial denture the surveyor is not used to:
a.
Contour the wax as part of the fabrication of the working cast
b.
Locate the guide planes
c.
Determine the location of indirect retainers
d.
Identify any undesirable undercuts
What is true about partial dentures:
a. They cause immediate changes in the oral plaque behavior
b.
Night wearing of dentures reduces plaque accumulation
c.
Relieving the gingival area reduces the gingival enlargement.
d.
All of the above
The function of ledge or shoulder on an abutment crown is:
a.
Retention
b.
Reciprocation and stabilization
c.
For providing guiding plane
d.
All of the above
Indirect retainers in cast RPD are best situated?
A.
As close to the fulcrum line
B.
In line with the fulcrum line
C.
In line with the direct retainers
D.
In line perpendicular with the fulcrum line
Elderly patients whose health contraindicates the lengthy and at times physically tiring appointments needed to construct fixed replacements for missing teeth, should be treated with?
A.
Treatment Partial Denture
B.
Transitional Partial Denture
C.
Interim Partial Denture
D.
Spoon Partial Denture
The first step in surveying the cast for removable partial denture is:
A.
Establishment of guiding plane.
B.
Establishment of undercuts for retention.
C.
Establishment of tooth contour for aesthetics.
D.
Establishment of interferences for major connector
The aim of providing rests is:
A.
To maintain the components in one position
B.
To make the partial denture tooth-borne
C.
To provide a point of fulcrum
D.
To distribute occlusal loads to the abutment teeth
The rest seat on the canine should be:
A.
Rounded
B.
Triangular
C.
V-shaped
D.
Flat
In the V-shaped rest:
A.
The apex of V to be pointed apically
B.
The apex of V to be pointed incisally
C.
The floor of the seat should be towards the cingulum
D.
The floor of the seat should be towards the axial wall
The heel raising movement of the partial denture is prevented by:
A.
Occlusal rest
B.
Indirect retainer
C.
Minor connector
D.
Direct retainer
The height of contour is:
A.
The distance from the cervical margin to the highest point on the tooth
B.
The distance from the cervical margin to the max. bulge of the tooth
C.
The line marked on the tooth with the help of surveyor that divides the tooth
into supra bulge and infra bulge areas
D.
The height of contour is the same at all angulations of the model to the
horizontal
Guiding planes prepared on enamel surfaces should be:
A.
Rounded
B.
Flat
C.
Should not be prepared
D.
Either
The functions of a guiding plane are:
A.
To provide for path of placement and removal of prosthesis
B.
To eliminate strain on abutment teeth during placement and removal
C.
To eliminate food traps between abutment teeth and denture bases
D.
All of the above
The best lingual rest will be on:
A.
The cingulum
B.
Lingual pit
C.
Near the cervical region
D.
Prepared rest seat on a cast restoration
The reciprocal arm should contact the tooth:
A.
When the retentive arm is activated
B.
After the retentive has crossed the height of contour
C.
Much before the retentive arm is activated
D.
After the denture has settled down completely
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