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D2 Fall - RPD > 8/27: Direct Retainers Pt.1 > Flashcards

8/27: Direct Retainers Pt.1 Flashcards

1
Q
  1. This is mechanical from retaining elements on abutment teeth
A

a. Primary retention

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2
Q
  1. This is intimate contact of minor connector with guide planes and contact of denture base and maxillary major connector with underlying tissues
A

a. Secondary retention

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3
Q
  1. This is a RPD component used to retain and prevent dislodgement
A

a. Direct retainer

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4
Q
  1. What are the types of direct retainers?
A

a. Intracoronal
b. Extracoronal

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5
Q
  1. What is the most esthetic direct retainer?
A

a. Intracoronal

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6
Q
  1. This type of direct retainer uses a clasp attachment
A

a. Extracoronal

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7
Q
  1. This has a internal precision attachment
A

a. Intracoronal retainer

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8
Q
  1. What type of direct retainer is more commonly used?
A

a. Extracoronal

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9
Q
  1. What are the types of clasps?
A

a. Suprabulge
b. Infrabulge

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10
Q
  1. This is a retentive arm approach undercut from above the survey line
A

a. Suprabulge

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11
Q
  1. What are the types of suprabulge clasps?
A

a. Circumferential
b. Akers
c. Circlet

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12
Q
  1. This is a retentive clasp arm approach undercut from below the survey line
A

a. Infrabulge

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13
Q
  1. What are the types of infrabulge clasps?
A

a. Bar clasp

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14
Q
  1. Tissue undercut can help prevent selection of what?
A

a. Infrabulge clasp

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15
Q
  1. A properly constructed suprabulge or infrabulge must incorporate what components?
A

a. Rest
b. Retentive clasp
c. Reciprocal element
d. One or more minor connectors

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16
Q
  1. The rest lies on what surfaces?
A

a. Occlusal or lingual or incisal surface or cingulum

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17
Q
  1. The reciprocal components are located where?
A

a. Above surveyor line

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18
Q
  1. The retentive clasp arm is located where and in what portion?
A

a. Proximal 2⁄3, above HOC
b. Rigid

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19
Q
  1. The retentive terminal is located where and in what portion?
A

a. Distal 1⁄3, below HOC
b. Flexible

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20
Q
  1. The retentive terminal is located where and in what portion?
A

a. Distal 1⁄3, below HOC
b. Flexible

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21
Q
  1. Does the retentive clasp or terminal provide direct retention?
A

a. Retentive terminal

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22
Q
  1. This joins the body of the clasp to the framework or the major connector
A

a. Minor connector/proximal plate

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23
Q
  1. Is the minor connector rigid or flexible?
A

a. Rigid

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24
Q
  1. This is the only minor connector that can be flexible
A

a. Approach arm

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25
Q
  1. This resists vertical movement towards the tissue
A

a. Support

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26
Q
  1. What is an example of support?
A

a. Rests

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27
Q
  1. This resists horizontal displacement
A

a. Stability

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28
Q
  1. This is all in the area above the survey line and is function of all rigid components
A

a. Stability

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29
Q
  1. Where is stability located in relation to the survey line?
A

Above

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30
Q
  1. The clasp assembly must encircle how much of the tooth?
A

a. 180 degrees

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31
Q
  1. Encirclement of the clasp assembly must have/be
A

a. May be continuous or broken
b. Minimum of 3 points used
c. Prevents tooth from moving away from the clasp

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32
Q
  1. How many points need to be used in the clasp assembly?
A

a. Minimum of 3

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33
Q
  1. What are the 6 requirements of the clasp assembly?
A

a. Support
b. Stability
c. Encirclement of more than 180 degrees
d. Reciprocation
e. Passivity
f. Retention

34
Q
  1. Should the components of the retainer exert force when seated? And what is this called?
A

a. No, passivity

35
Q
  1. Retentive clasps should become active ONLY when ____
A

a. Disclosing forces are applied to them

36
Q
  1. The ability of the retentive clasps is based on what?
A

a. Resistance of the material to deform

37
Q
  1. Retentive clasps flexibility factors rely on what 5 things?
A

a. Length
b. Diameter
c. Taper
d. Cross-sectional form
e. material

38
Q
  1. In the retentive clasps, how is length related to flexibility?
A

a. Flexibility = length^3
b. Double length = 8x flex

39
Q
  1. If you increase retentive clasp length, you have to
A

a. Curve clasp more

40
Q
  1. In the retentive clasp, how is diameter related to flexibility?
A

a. Flexibility = 1/diameter^3
b. Double diameter = 8x less flex

41
Q
  1. In the retentive clasp arms, how does tapering work? (dimensions)
A

a. 2 dimensions (thickness and width)
b. Decreases 2 fold down (2 → 1mm)

42
Q
  1. What are the 2 cross-sectional shapes?
A

a. Half round
b. round

43
Q
  1. Is the round clasp or the half-round clasp more flexible?
A

a. Round clasp

44
Q
  1. Round clasp flexes in what planes?
A

a. All spatial planes

45
Q
  1. Half-round flexes in what planes?
A

a. 1 plane

46
Q
  1. This cross-sectional shape is almost always in circumferential clasps
A

a. Half-round

47
Q
  1. This cross-sectional shape is in wire clasps
A

a. Round

48
Q
  1. What is the order of most to least flexible materials?
A

a. Wrought > cast gold > cast chromium

49
Q
  1. With increasing clasp flexibility, we must use what to obtain equal retention?
A

a. Deeper undercuts

50
Q
  1. Is the proximal seat adjusted before the rest seat?
A

Yes

51
Q
  1. What undercut for cast chrome?
A

a. 0.01

52
Q
  1. What undercut for cast gold?
A

a. 0.015

53
Q
  1. What undercut is for wrought wire?
A

a. 0.02

54
Q
  1. What metal is used in the framework?
A

Alloy

55
Q
  1. What metal is used in the clasps?
A

a. Wrought wire

56
Q
  1. This is a type of suprabulge clasp
A

a. Circumferential clasp

57
Q
  1. This is a type of infrabulge clasp
A

Bar clasp

58
Q
  1. This pulls towards occlusal to resist displacement
A

a. Circumferential clasp

59
Q
  1. This pushes towards the occlusal to resist displacement
A

a. Bar clasp

60
Q
  1. Which clasp is easier to seat and remove?
A

a. Bar = easier
b. Circumferential = remove

61
Q
  1. This is when on part of the framework opposes the action of the retainer in function
A

a. Reciprocation

62
Q
  1. What is the most logical clasp for tooth supported RPD (Kennedy class III)?
A

Circumferential

63
Q
  1. What circumferential shape is used for the retentive clasp?
A

a. 1⁄2 round

64
Q
  1. What circumferential shape is used for the reciprocal clasp?
A

a. 1⁄2 round

65
Q
  1. The reciprocal clasp is located where?
A

a. Middle 1⁄3

66
Q
  1. Does the reciprocal clasp have a taper?
A

No

67
Q
  1. What are the types of circumferential clasps?
A

a. Circlet
b. Embrasure clasp
c. Ring clasp
d. Combination clasp

68
Q
  1. This is the circumferential clasp of choice for class III
A

a. Circlet

69
Q
  1. This is when 2 circlet clasps are joined
A

a. Embrasure clasp

70
Q
  1. This clasp is used when you have a dentate area
A

a. Embrasure clasp

71
Q
  1. When is an embrasure clasp used?
A

a. Class III no mod
b. Class II no mod
c. Class IV

72
Q
  1. When indication is needed for Ring clasp?
A

a. ML tipped molar

73
Q
  1. The ring clasp engages what undercut?
A

a. ML

74
Q
  1. Should you avoid the ring clasp when possible? Why?
A

a. Yes bc if its incorrect you get no reciprocation

75
Q
  1. What indication is needed for the Reverse circlet clasp?
A

a. Retentive undercut adjacent to edentulous space
i. Class III
ii. Tooth-tissue supported (class 1 or 2 extension)
iii. 1⁄2 T bar clasp preferred

76
Q
  1. This is when a wrought round wire retentive clasp and cast 1⁄2 round reciprocal clasp is used
A

a. Combination clasp

77
Q
  1. What is a contraindication for a tissue undercut?
A

a. T bar (infrabulge)

78
Q
  1. What are indications for combination clasp?
A

a. Distal extension RPD (class 1 or 2)

79
Q
  1. What undercut is an indication for combination clasp?
A

a. MF

80
Q
  1. What are the indications for a RPC clasp assembly (RPA)?
A

a. Class I and 2
b. MF undercut

81
Q
  1. What is part of the class assembly?
A

a. Rest
b. Circumferential retentive clasp
c. Reciprocation

D2 Fall - RPD (10 decks)

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