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Monday, February 09, 2009

88 Prosthodontics MCQs

Monday, February 09, 2009
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Symmetrical widening of the periodontal ligament space around one or more teeth is an important early manifestation of

a. a “too-well-fitting” RPD

b. poor force control by the major connector

c. chondrosarcoma

d. occlusal traumatism

e. osteosarcoma

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87 Prosthodontics MCQs

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Keratitis of the eyes, scaly dermatitis of the nasolabial area, cheilitis and glossitis are clinical features of


A. Vitamin C deficiencies

B. excessive intake of Vitamin A

C. hormone imbalance

D. diabetes mellitus

E. Vitamin B deficiencies


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86 Prosthodontics MCQs

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Ulcerated soft tissues that resist therapy and are associated with a mandibular RPD are of particular concern if located


A. in the buccal vestibule

B. on the crest of the ridge

C. in the retromylohyoid area

D. in the anterior portion of the floor of the mouth

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Saturday, February 07, 2009

85 Prosthodontics MCQs

Saturday, February 07, 2009
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The first step in relining a distal-extension removable partial denture is to

  1. correct the occlusion
  2. verify the fit of the framework
  3. border mold the denture base
  4. eliminate undercuts in the denture base
  5. re-establish the plane of occlusion by using modeling compound in the tissue surface of the denture base.
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84 Prosthodontics MCQs

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From radiographic evidence, a dentist can best predict the reaction of alveolar bone to the additional stress load of a removable partial denture by the


  1. trabecular pattern of the alveolar bone
  2. amount of alveolar bone support remaining
  3. amount of alveolar bone loss already sustained
  4. reaction of bone to previously induced stresses
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83 Prosthodontics MCQs

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A master cast is placed in the cast holder and aligned at the zero degree tilt. A 0.02 “ undercut is found on the mesiolingual of the mandibular right second molar. Tilting the cast to the anterior will


  1. increase the undercut
  2. decrease the undercut
  3. not effect the undercut
  4. none of the above. The cast should not be tilted since all RPD’s are designed at the zero degree tilt.
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82 Prosthodontics MCQs

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According to Coolidge and Orban the average width of the periodontal membrane is

  1. .25 in.
  2. .24 in. + .1 in.
  3. .25 mm + .1 mm
  4. .25 mm
  5. none of the above
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81 Prosthodontics MCQs

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The dentist who first proposed the mesial rest, guiding plate, I-bar design in order to control functional forces was


  1. DeVan
  2. Poffenbarger
  3. Orban
  4. Kratochvil
  5. Krol
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Friday, February 06, 2009

80 Prosthodontics MCQs

Friday, February 06, 2009
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Dislodging movement of a RPD is resisted by


  1. stabilizing clasps
  2. mechanical retainers
  3. reciprocating clasps
  4. denture base retainers
  5. denture base mesh
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79 Prosthodontics MCQs

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If I bars are not placed on the height of contour of the abutment (in a frontal plane), their functional motion must be plotted in relation to the


A. guiding plane location

B. terminal rest location

C. denture base location

D. artificial tooth location

E. Ante’s law

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78 Prosthodontics MCQs

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The denture design whose advantages are (1) less contour distortion of abutments, (2) less contact of metal to teeth, (3) cleaner design, (4) more efficient mechanical retention and (5) improved esthetics is the:


  1. precision attachment design
  2. stressbreaker design
  3. Aker’s design
  4. I-bar, distal rest, guiding plate design
  5. RPI design
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77 Prosthodontics MCQs

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Ordinarily, retentive clasps are not located on the opposite side of the rotational axis from the denture base. If a retainer is used, it must have increase ______________ or engage an undercut that is minimal.

  1. taper
  2. flexibility
  3. nickel content
  4. roundness in cross section
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76 Prosthodontics MCQs

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Even though multiple rests have been used in a Class I RPD, when the path of dislodgement is not controlled all rests disengage except for those located the

  1. farthest from the denture bases
  2. nearest the denture bases
  3. none disengage
  4. all disengage
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Thursday, February 05, 2009

75 Prosthodontics MCQs

Thursday, February 05, 2009
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The main axis of rotation downward for a Class I RPD will pass through the

A. rigid connectors

B. terminal rests on either side of the dental arch

C. guidelines

D. tips of the retainers


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74 Prosthodontics MCQs

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If the path of dislodgement is controlled, an I-bar is most often located in .01” undercut on the


  1. cemento-enamel junction
  2. greatest mesio-distal curvature of the buccal or lingual surface
  3. mesio-buccal line angle
  4. disto-buccal line angle
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73 Prosthodontics MCQs

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In an extension RPD (class I, II, IV) metal of the framework must not be placed above the survey line anywhere on a tooth between the denture base and the


  1. farthest rest
  2. opposing teeth
  3. nearest rest
  4. stabilizing clasp
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72 Prosthodontics MCQs

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During construction, the framework whose metal covers exostoses or inclined slopes of alveolar bone located between the edentulous segment and its nearest rest must be

  1. deplated
  2. stripped
  3. polished
  4. relieved
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71 Prosthodontics MCQs

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Stress breakers are indicated for use when the clinical exam reveals that the


  1. residual ridge is atrophic and the teeth are strong
  2. denture will be tooth borne
  3. residual ridge is strong and the teeth are weak
  4. residual ridge is weak and so are the teeth
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70 Prosthodontics MCQs

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Flexible major connectors produce


  1. necrosis of the mucosa
  2. localized stress on isolated support areas
  3. noxious vapors
  4. allergic reactions
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Sunday, February 01, 2009

69 Prosthodontics MCQs

Sunday, February 01, 2009
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The concept of distributing functional stresses among all of the remaining oral anatomy is called


A. functional basin
B. broad stress distribution
C. Steffel’s theory of design
D. Kratochvil’s concept of design


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68 Prosthodontics MCQs

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Selection of abutments for RPDs depends upon information about many factors. Which one of the following is the least important criterion for abutment selection?

A.arch location
B.crown to root ratio
C. root form and number of roots
D.inclination
E. mobility, alveolar support, estimation of added stress


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