Mouth preparation & Class I #WikiDentia

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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:

1 point

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

Clear selection

The 1" step in the alteration of the abutmentteeth contour in the natural tooth preparationfor the RPD is

1 point

A. Preparation of the oclusal 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

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A tooth which has not been in function and is now being used as an abutment may become symptomatic. This most likely results from:

1 point

A. Overstress

B. Pulpal reaction

C. Localized osteoclastic activity

D. Reaction within periodontal ligament

Clear selection

The most effective means of limiting applied loads to abutment teeth in a distal extension partial denture is by:

1 point

A. Using a stress breaker

B. Using acrylic replacement teeth

C. Splinting abutments to adjacent teeth

D. Maintaining a stable base - tissue relationship

Clear selection

Modification space in Kennedy classification represents?

1 point

A. Bilateral edentulous arcas 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

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The guiding plane serve which of the following function:

1 point

. 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

Clear selection

Which is not true for guiding plane:

1 point

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

Clear selection

The ideal occlusogingival height for preparing guiding planes on the proximal or lingual surfaces of the abutment tooth should be:

1 point

a. 0.5 to 1 mm

b. 1 to 1.5 mm

c. 2 to 4 mm

d. 5 to 7 mm

Clear selection

The process of preparing a small indentation in the enamel of tooth surface into which a retentive clasp can be placed is known as:

1 point

a. Pickling

b. Dimpling

c. Enameloplasty

d. None of the above

Clear selection

Which of the following is a function of rest seat:

1 point

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

Clear selection

. In the construction of partial denture the surveyor is not used to:

1 point

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

Clear selection

What is true about partial dentures:

1 point

a. They cause an immediate changes in the oral plaque behaviour

b. Night wearing of dentures reduces plaque accumulation

c. Relieving the gingival area reduces the gingival enlargement.

d. All of the above

Clear selection

The function of ledge or shoulder on an abutment crown is:

1 point

a. Retention

b. Reciprocation and stabilization

c. For providing guidng plane

d. All of the above

Clear selection

Indirect retainers in cast RPD are best situated?

1 point

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

Clear selection

Elderely patients whose health contraindicates the lengthy and at times physically tiring appointments needed to construct fixed replacements for missing teeth, should be treated with?

1 point

A. Treatment Partial Denture

B. Transitional Partial Denture

C. Interim Partial Denture

D. Spoon Partial Denture

Clear selection

The first step in surveying the cast for removable partial denture is:

1 point

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

Clear selection

The aim of providing rests is:

1 point

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

Clear selection

The rest seat on the canine should be:

1 point

A. Rounded

B. Triangular

C. V-shaped

D. Flat

Clear selection

In the V-shaped rest:

1 point

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

Clear selection

The heel raising movement of the partial denture is prevented by:

1 point

A. Occlusal rest

B. Indirect retainer

C. Minor connector

D. Direct retainer

Clear selection

The height of contour is:

1 point

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

Clear selection

Guiding planes prepared on enamel surfaces should be:

1 point

A. Rounded

B. Flat

C. Should not be prepared

D. Either

Clear selection

The functions of a guiding plane are:

1 point

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

Clear selection

The best lingual rest will be on:

1 point

A. The cingulum

B. Lingual pit

C. Near the cervical region

D. Prepared rest seat on a cast restoration

Clear selection

The reciprocal arm should contact the tooth:

1 point

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

Clear selection

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