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Prosthetics > Prosthetics MCQ > Flashcards

Prosthetics MCQ Flashcards

1
Q

What is the spacer foil in the plastic shell coping method(adapta) used for?

A
  • Spacer for cement

- Easier workability

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2
Q

What’s the thickness of the base foil in the plastic shell coping method (Adapta)?

A

0.6 mm

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3
Q

The vestibular wall on the metal-acrylic crowns shouldn’t be less than:

A

0.3 mm

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4
Q

Which stages of the ceramic sintering is done with vacuum?

A
  • Placement of the opaque layer
  • Placement of the enamel layer
  • First correction of the ceramic
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5
Q

Which part of the prepared full veneer crown tooth is the widest ?

A

The cervix

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6
Q

Name 4 pontic design profiles

A
  • Hygienic
  • Ridge lap
  • Modified ridge lap
  • Ovate
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7
Q

Where on the wax pattern is the sprue usually attached?

A

On a lingual cusp

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8
Q

Which gingivo-occlusal third of the connection between the retainer and the pontic
should be wax free?

A

gingival third

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9
Q

Name at least three different kinds of ceramic layers (for a metal ceramic restorations)

A

Dentine, enamel, opaque

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10
Q

At what depth could the marginal edge enter in the gingival groove?

A

0.3 – 0.5 mm

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11
Q

What kind of retentions can be used when preparing metal restoration with acrylic veneering material?

A
  • Small pearls

- Wax retention

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12
Q

Name at least 3 systems for preparing working casts with removable dies

A
  • Straight dowel pin
  • Curved dowel pin
  • Pindex system
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13
Q

The emergence profile is the perpendicular distance between the tip of a cusp and its base plane

A

false

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14
Q

The external surface of the cemented restoration should create as nearly a perfect uninterrupted transition from restorative material to tooth as
possible

A

true

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15
Q

Hardest of all abrasives

A

DIamond

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16
Q

incorporated into pastes for use on brushes or cloth wheels

A

Tripoli, Rouge

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17
Q

Name at least three finish line configurations for full veneer crown preparation

A
  • Feathered edge/knife edge
  • Chamfer
  • Shoulder
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18
Q

What is the base foil in the plastic shell coping method (Adapta) used for?

A

It’s used as a base for the was pattern

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19
Q

What’s the thickness of the spacer foil in the plastic shell coping method (Adapta)?

A

0.1 mm

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20
Q

The cervical wax in the Adapta method is placed

A

between the edge of the base foil and the preparation margin

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21
Q

How should a prepared tooth look like?

A

The axial walls should converge occlusally 2-6 degrees

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22
Q

Name the parts of a fixed bridge prosthesis

A

Abutment, retainer, pontic and connector

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23
Q

Which stage of the ceramic sintering procedure is done without vacuum?

A

Placement of the glaze

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24
Q

The channel through which metal is cast into a mould is called

A

Sprue

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25
Q

To provide adequate bulk of alloy during solidification, the sprue itself should be no longer than:

A

6.0 mm

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26
Q

Where on the wax pattern is the sprue usually attached?

A

On a lingual cusp

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27
Q

Name at least 3 systems for preparing working casts with removable dies

A

Dowl pin technique, di lock tray, pindex

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28
Q

Polishing metals and ceramics done with

A

Rubber wheels, pastes, brushes

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29
Q

Finishing and polishing starts with

A

An abrasive that is coarse enough to remove gross irregularities

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30
Q

Which part of the prepared full veneer crown tooth is the widest ?

A

The cervix

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31
Q

At what depth could the marginal edge enter the gingival groove

A

0.3 – 0.5 mm

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32
Q

According to the Kennedy classification system for edentulism class I represents:

A

Bilateral posterior edentulous area

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33
Q

Major connector and direct retainer are parts of the removable partial denture

A

True

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34
Q

The lingual bar is a mandibular major connector

A

True

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35
Q

Lingual bar shape

A

Pear shape

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36
Q

Lingual bar superior border distance from free gingival margin

A

3mm

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37
Q

The complete and modified palatal plate have wide application, but mostly to

A

Class I and Class II

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38
Q

Name the parts of a direct retainer

A
  • Retentive arm
  • Reciprocal arm
  • shoulder
  • body
  • Rest
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39
Q

occlusal rests transfer stresses to the abutment tooth

A

True

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40
Q

The impression surface of a complete denture is

A

The intaglio surface

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41
Q

The custom tray is fabricated using

A

The diagnostic cast

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42
Q

Correct sequence of lab steps in fabrication of acrylic complete denture

A

diagnostic casts, master casts, base plates and occlusal rims, mounting on an articulator,
arrangement of the artificial teeth, wax-up, flasking, curing, finishing

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43
Q

The correct position of maxillary central incisor according to Gysi is

A

saggital plane 0º, frontal plane 5-8º, the incisal edge touches the occlusal plane

44
Q

Components of a complete denture

A

Denture base, flanges, denture borders and artificial teeth

45
Q

What is/are the function/s of the denture base

A

Support and retention

46
Q

Artificial teeth can be made of

A

acrylics, porcelain and resin

47
Q

The external surface of the lingual/ buccal/ labial flanges of the denture refers to

A

The cameo surface

48
Q

Describe the curve of spee

A

An imaginary anteroposterior curve beginning from the tip of the canines, following the buccal cusp tips of posterior teeth and continuing to the anterior border of the ramus

49
Q

The arrangement of maxillary molars forms both the curve of spee and the curve of Wilson

A

True

50
Q

According to Gysi which of the maxillary teeth are above the glass plate

A

lateral incisions and second molar

51
Q

Arrange in correct order the cusps of the maxillary first molar starting with the cusp
which is closest to the glass plate

A

mesiolingual cusp, mesiobuccal cusp, distolingual cusp, distobuccal cusp

52
Q

What is the most common problem when packing a two-part mould in the conventional
manner

A

increase in vertical dimensions

53
Q

When using conventional cuvette technique acrylic is processed by

A

injecting

54
Q

Dewaxing procedure is done

A

to remove the wax in the wax pattern so that a mould space is made for acrylic to fill in

55
Q

to remove the wax in the wax pattern so that a mould space is made for acrylic to fill in

A
  • Establish vertical dimension
  • Determine centric relation position
  • No cast to cast contact at the posterior end of the rim
56
Q

Finishing and polishing the dentures include

A

trimming, sand papering, pumice wash

57
Q

In special trays the border of the tray must be shorter than the posterior palatal seal area ( an area between the
soft and hard palate

A

False

58
Q

.What’s the function of the retentive arm (clasp)

A

provides resistance to vertical displacement of the rpd

59
Q

What is the level of the wax in the final wax up of the dentures in the area of the
premolars

A

till the height of contour

60
Q

Name at least 4 components of the removable partial denture

A

-Major connector
-Minor connector
-Rest
-Direct retainer
-Indirect retainer
-Attachment
-Denture
base
-Tooth replacement

61
Q

The custom tray is fabricated using

A

the diagnostic cast

62
Q

the anatomic curve established by the occlusal alignment of the teeth in the median plane

A

The compensating curve of Spee

63
Q

The arrangement of maxillary molars forms both the curve of spee and the curve of Wilson

A

True

64
Q

Working with Pindex system, the pins are placed

A

after the plaster sets

65
Q

Working with Adapta, system, no pins are used

A

True

66
Q

Write down the main components of any FPD

A

Retainer, Pontic, Connectors, Abutment

67
Q

Write down the main components of any direct retainer

A

Retentive arm, reciprocal arm, shoulder, body, rest

68
Q

If the patient needs prosthetic treatment with both fixed and removable prosthesis, the fixed restoration (full coverage crowns, bridges) will be fabricated first

A

True

69
Q

What is the correct sequence of ceramic layers when a metal-ceramic crown is

A

Opaque, dentine, enamel, translucent

70
Q

The noble metals are used in CAPTEK coping are

A

Gold, platinum, palladium

71
Q

The CAPTEK coping is fabricated by

A

firing in a porcelain furnace on a refractory die

72
Q

What kind of restoration could be manufactured using CAD/CAM technology

A

All of them

73
Q

During sintering zirconium dioxide undergoes the following changes

A

Volume is decreased, strength is increased

74
Q

Which technology is suitable for dental ceramics

A

layering technique, pressing technique, CAD/ CAM

75
Q

Lithium disilicate ceramics for press techniques could be used for manufacturing

A

Veneers, partial and complete crowns

76
Q

Which type of dental gypsum is suitable for working models (crowns, bridges)

A

. type 4 dental stone

77
Q

Retention and stability of removable partial dentures are achieved by

A

Clasps

78
Q

When proximal surfaces of adjacent teeth diverge from an area of contact, an
embrasure is formed

A

lingually, facially, occlusally and cervically

79
Q

Polyethers belong to the group of

A

elastomers

80
Q

Stock trays are

A

are used for taking a preliminary impression

81
Q

The main body and the catalyst for additive silicons are mixed in

A

non-equal volumetric and weight proportions

82
Q

Which impression material is electroconductive

A

C-silicons

83
Q

When a model with preserved gingival contour is made for an implant case, the first
thing that is poured into the impression is

A

gingival mask

84
Q

Properly planned dowel core restoration, requires that

A

the length of the dowel should be equal or longer than the length o f the future crown

85
Q

In master-cast duplication method the wax pattern is

A

not removed from the model for casting

86
Q

Which of the following methods for fabrication metal free crowns is based on melting
the crystalline structures of the ceramics

A

pressed ceramics

87
Q

Bilateral posterior edentulous area according to Kennedy’s classification are

A

class 1

88
Q

Precision attachments are made of

A

both patrix and matrix= precious alloy

89
Q

Which attachment is not a stock attachment

A

Telescopic crown

90
Q

When a model with preserved soft gingival contour is made, for implant cast, the soft
material

A

is poured directly in the impression before pouring the plaster

91
Q

The function of the reciprocal arm of a direct retainer is

A

to stabilize the tooth

92
Q

A Major connector

A

connects the components of RPD

93
Q

Clasp retainers

A

can be done both ways, by casting and bending

94
Q

Dentoalveolar clasps

A

are made of the same material as the denture base

95
Q

the first stage of planning of direct retainer, a surveyor is used for determining the

A

depth of the undercuts

96
Q

Which of the following equators, can be manipulated and altered

A

prosthetic equator

97
Q

The master cast duplication method requires

A

duplication of the plaster model and replacement with investment material

98
Q

Write the four components of dowel core:

A

Core, Dowel, Crown, Ferrule, Tooth

99
Q

What pontic is commonly used for aesthetics requirement

A

Ovate pontic

100
Q

Polyether is what type of impression material?

A
  • Replicating material, hydrophilic elastomeric impression material
  • Polyethers have good elastic properties and are particularly suited for implant prosthodontics.
101
Q

What cannot be milled?

A 
-Telescopic crown are mille-d !
Stock attachments (cannot be milled because they are prefabricated
102
Q

Horizontal distance between cutting edges of the upper and lower teeth

A

overjet

103
Q

Vertical distance between the cutting edges of the upper and lower teeth

A

overbite

104
Q

The mechanism of connection of the metal cap and the porcelain is realized by:

A

Mechanical bonding, CTE, Van der Waals forces, chemical bonding

105
Q

Indirect Retainers are also called

A

Kipmayders

106
Q

The arrow-shaped angle obtained by using a graphical registration of the movements of
the lower jaw corresponds to

A

Gothic angle

107
Q 
By which class of the Kennedy classification is a unilateral limited defect in the
dentition
A

III class

Prosthetics (37 decks)

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