120 MCQs in Prosthodontics

For a distal extension removable partial denture, the jaw relations should be recorded ____________ the secondary impression is made and __________ the framework in place.

1. before; with
2. before; without
3. after; with
4. after; without
5. as; with

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119 MCQs in Prosthodontics

Who developed the most widely accepted classification system for partially edentulous arches?

1. Skinner
2. Applegate
3. Kennedy
4. Barlyn
5. Toth

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118 MCQs in Prosthodontics

If your laboratory technician is conscientious, dependable, and knowledgeable in all the details of good partial denture design and construction, you should make the prescription for the partial denture by

1. submitting a rough sketch of the design and relying on the technician’s ability and training to produce an acceptable denture
2. drawing all the details of the design on the master cast and submitting it with the expectations that it will be followed explicitly
3. labelling a colored pencil drawing on a chart, outlining it on the master, and providing the technician with written instructions
4. consulting with the technician throughout the designing phase to allow the technician to share in the responsibility for the design
5. simply send the final impression to the lab with a note to “Just Do It”

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117 MCQs in Prosthodontics

The primary requirement of a major connector is that it be

1. flat
2. polished
3. flexible
4. a design from the book
5. rigid

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116 MCQs in Prosthodontics

If the lingual alveolar bone in the premolar region of the mandible has anything but a steep vertical slope, any rigid metal covering the area during downward function must be

1. relieved during construction
2. thickened during the wax-up
3. relieved at delivery
4. relieved after delivery
5. slightly in contact

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115 MCQs in Prosthodontics

The textbook authors and your lecturers recommend that, after mouth preparations, an impression be made in irreversible hydrocolloid and a cast poured in quick-setting stone. The purpose of this is to

1. determine the proper size of stock tray for reversible hydrocolloid
2. maximum resident benefit
3. make a cast available to the laboratory for final waxing and casting
4. evaluate the contours of the occlusal rests for adequate reduction
5. verify that proper contours have been provided on the potential abutment teeth

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114 MCQs in Prosthodontics

The part of a removable partial denture that assists the direct retainers in preventing displacement of distal extension bases by functioning as part of the resistance arm of a lever anterior to the fulcrum line is termed a (an)

1. reciprocal clasp arm
2. indirect retainer
3. inadvertent retainer
4. guiding plane
5. rester

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113 MCQs in Prosthodontics

Which of the following are elements of the clasp assembly?

1. Major connector

2. Retentive clasp arm

3. Minor connector

4. Stabilizing clasp arm

5. Rest

1. 1, 2
2. 1, 3, 5
3. 2, 4, 5
4. 2, 3, 4, 5
5. 1, 2, 3, 4, 5

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112 MCQs in Prosthodontics

Two or more parallel axial surfaces of abutment teeth shaped to direct the prosthesis during placement and removal are called

1. reciprocal clasp arms
2. indirect retainers
3. guiding planes
4. undercuts
5. retentive clasp guidance

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111 MCQs in Prosthodontics

All of the following features describe the proximal plate/guiding plate area needed for proper functioning of the RPI clasp assembly, except

1. a guiding plane is prepared on the distal surface of the abutment tooth in the occlusal one-third
2. the guiding plane is approximately 2 3 mm in height occlusogingivally
3. an undercut should exist below the guiding plane to permit movement of the proximal plate
4. the proximal plate contacts approximately 1 mm of the occlusal portion of the guiding plane
5. the proximal plate contacts approximately 1 mm of the gingival portion of the guiding plane

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110 MCQs in Prosthodontics

All of the following are sites of arbitrary blockout of the mandibular RPD master except

1. all gingival crevices
2. gross tissue undercuts situated below areas involved in design of denture framework
3. labial and buccal tooth and tissue undercuts not involved in denture design
4. tissue undercuts to be crossed by origin of bar clasps
5. all of the above are sites of arbitrary blockout

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109 MCQs in Prosthodontics

According to the Kennedy Classification of partially edentulous arches, a single, but bilateral edentulous area crossing the midline, and located anterior to the remaining teeth would be a

1. Class I
2. Class II
3. Class III
4. Class IV
5. Class V

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108 MCQs in Prosthodontics

All of the following statements are considerations when relining a bilateral distal extension RPD opposing a maxillary complete denture, except

1. loss of posterior occlusal contact between the complete denture and removable partial denture may necessitate reestablishment of the original occlusal relationship
2. it is not unusual for a patient to complain of looseness of the maxillary complete denture and request relining of that denture when actually it is the removable partial denture that needs relining
3. evidence of rotation of the distal extension removable partial denture about the fulcrum line must be the deciding factor as to whether relining needs to be done
4. a closed-mouth impression procedure is indicated when relining the bilateral distal extension RPD
5. an open-mouth impression procedure is indicated when relining the bilateral distal extension RPD

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107 MCQs in Prosthodontics

All of the following are principal objections to the use of a U-shaped maxillary removable partial denture major connector, except

1. its lack of rigidity, compared to other designs, may induce torque or direct lateral force to abutment teeth
2. the design fails to provide good support characteristics and may permit impingement of tissues underlying its palatal borders when subjected to occlusal loading
3. bulk to enhance rigidity results in increased thickness in areas most frequented by the tongue
4. movement is particularly noticeable and is traumatic to the residual ridge in distal extension removable partial dentures when posterior tooth support is nonexistent
5. the lack of interfacial surface tension between the metal and tissues reduces the amount of retention of the prosthesis

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106 MCQs in Prosthodontics

All of the following statements concerning major connectors are correct, except

1. at least 8 mm of vertical space between the active floor of the mouth and gingival margins of the teeth is required for a mandibular lingual bar major connector
2. in the maxillary arch, the border of the major connector should be at least 6 mm from the gingival crevice of the teeth
3. in the mandibular arch, the border of the lingual bar major connector should not be closer than 2 - 3 mm to the gingival margins
4. the border of the maxillary major connector should be scalloped to mimic the gingival crevices of the teeth
5. the border of the mandibular major connector should run parallel to the gingival margin of the teeth

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105 MCQs in Prosthodontics

All of the following are correct statements concerning an occlusal rest, except

1. the rest prep should extend one-half the buccolingual width of the tooth from cusp tip to cusp tip
2. the rest prep should extend on-third to one-half the mesiodistal width of the tooth
3. the rest seat is prepared such that the deepest portion is at the marginal ridge
4. the rest measures between 1.0 to 1.5 mm thick where it crosses the marginal ridge
5. the occlusal rest seat is prepared so that the enclosed angle formed by the floor of the rest seat and a line dropped down the proximal surface of the tooth must be less than 90 degrees

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104 MCQs in Prosthodontics

All of the following describe a reciprocal clasp arm, except

1. it is placed above the height of contour
2. it is a rigid clasp arm
3. it must contact the tooth after the retentive clasp arm passes over the height of contour
4. it must contact the tooth before the retentive arm passes over the height of contour
5. ideal placement should be at the junction of the gingival and middle third of the abutment tooth crown

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103 MCQs in Prosthodontics

Which of the following is not a function of an indirect retainer?

1. a part of the RPD that assists the direct retainers in preventing displacement of distal extension denture bases by functioning through lever action on the opposite side of the fulcrum line
2. it tends to reduce anteroposterior tilting leverages on the principle abutments
3. contact of the minor connector with vertical tooth surfaces aids in stabilization against horizontal movement of the denture. Such tooth surfaces, when made parallel to the path of placement, may also act as auxiliary guiding planes.
4. anterior teeth supporting indirect retainers are splinted against lingual movement
5. aids in retention of the RPD by increasing the strength of the direct retainers by redistributing the forces to all areas of the mouth.

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102 MCQs in Prosthodontics

Which of the following are true about gypsum bonded casting investments?

1. should be allowed to set a minimum of 45 minutes

2. should be heated no longer than 30 minutes at 900 degrees F

3. the mold temperature should not exceed 1200 degrees F

4. used for alloys with melting temperatures exceeding 1800 degrees F

5. ideal mold temperature for hygroscopic technique is 875 degrees F

1. 1, 2, 3, 5
2. 1, 3, 5
3. 2, 3, 4
4. all of the above
5. none of the above are correct statements

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101 MCQs in Prosthodontics

The tripping action of Stone refers to

1. the water / powder proportion of the mix
2. the removal of a suprabulge clasp
3. the framework is more retentive on a cast than in the mouth
4. the removal of an infrabulge clasp
5. none of the above

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