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Removable Partial Prosthodontics > Direct Retainers (Part I) > Flashcards

Direct Retainers (Part I) Flashcards

1
Q

RPD retention resists::

A

Dislodging forces

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2
Q

Mechanical retention from retaining elements on abutment teeth:

A

Primary retention

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3
Q

Retention due to the intimate contact of minor connector with guid planes:

A

Secondary retention

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4
Q

Retention due to the intimate contact of denture base & maxillary major connector with underlying tissues:

A

Secondary retention

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5
Q

RPD component used to retain and prevent dislodgment:

A

Direct retainer

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6
Q

What are the two types of direct retainers?

A
  1. Intracoronal
  2. Extracoronal
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7
Q

Type of direct retainer characterized by internal precision attachment (key/keyway):

A

Intracoronal

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8
Q

What type of direct retainer is considered the most esthetic?

A

Intracoronal

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9
Q

What are the disadvantages to an intracoronal direct retainer?

A

Requires crown, complex fabrication & high maintenance

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10
Q

What type of direct retainer is more commonly used?

A

Extracoronal

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11
Q

Type of direct retainer characterized by a clasp assembly:

A

Extracoronal

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12
Q

What are two types of clasps?

A
  1. Suprabulge
  2. Infrabulge
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13
Q

Type of clasp in which the retentive arm approaches undercut from above the survey line:

A

Suprabulge

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14
Q

Suprabulge clasps may also be referred to as:

A

Circumferential, Akers, circlet

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15
Q

Type od clasp in which the retentive arm approaches undercut from below survey line:

A

Infrabulge

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16
Q

An infrabulge clasp may also be referred to as:

A

Bar clasps

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17
Q

What type of direct retainer is seen in the following image?

A

Intracoronal

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18
Q

What type of direct retainer is seen in the following image?

A

Extracoronal

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19
Q

What type of clasp is seen in the following image?

A

Suprabulge

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20
Q

What type of clasp is seen in the following images?

A

Infrabulge

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21
Q

Label the following components of the supra-gingival clasp assembly:

(Top to bottom)

A

Rest
Reciprocal clasp
Retentive clasp
Proximal plate

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22
Q

Label the types of clasps seen in the following image:

A

A) Suprabulge clasp
B) Infrabulge clasp

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23
Q

A properly constructed suprabulge or infrabulge clasp assembly must incorporate the following components: (4)

A
  1. a rest
  2. a retentive clasp
  3. a reciprocal element
  4. one or more minor connectors
24
Q

Label the following parts of the clasp assembly:

A

A) Retentive clasp arm
B) Rest
C) Minor connector
D) Reciprocal arm

25
Q

Label the following components:

A

A) Direct retainer
B) Rest
C) Reciprocal arm
D) Direct retainer
E) Reciprocal plate

26
Q

Component of the clasp assembly that lies on occlusal, lingual or incisal surface and functions to precent tissueward movement of clasp:

A

Rest

27
Q

What is the function the rest component of a clasp assembly?

A

Prevent tissueward movement of clasp

28
Q

Label each type of rest seen in the following image:

(Left to right)

A

Occlusal rest, Cingulum chevron rest, lingual ball rest, incisal rest

29
Q

Where might the rest component of a clasp assembly lies on?

A
  1. Occlusal surface
  2. Lingual surface
  3. Incisal surface
30
Q

Rigid component of a clasp assembly that is above the heigh of contour:

A

Reciprocal components

31
Q

Reciprocal components of the clasp assembly include:

A
  1. Reciprocal clasp
  2. Lingual plate
  3. Proximal plate
  4. Guide plate
    (minor connectors)
32
Q

What clasp assembly component is seen in the following image?

A

Reciprocal components

33
Q

Clasp assembly component characterized by the rigid portion, above the height of contour; proximal 2/3:

A

Retentive clasp arm

34
Q

Clasp assembly component characterized by the flexible portion, below the height of contour; distal 1/3; provides direct retention:

A

Retentive terminal

35
Q

What is the function of the retentive terminal?

A

Provides direct retention

36
Q

Clasp assembly component that is described as rigid, and functions to join the body of clasp to the framework:

A

Minor connector

37
Q

The arrow in the following image is pointing to the:

A

Minor connector

38
Q

Clasp assembly component that is a component of a bar clasp that connects the clasp to the framework and is described as the flexible minor connector:

A

Approach arm

39
Q

What clasp assembly component is seen in the following image?

A

Approach arm

40
Q

List the six clasp assembly components:

A
  1. Rests
  2. Reciprocal components
  3. Retentive clasp arm
  4. Retentive terminal
  5. Minor connector
  6. Approach arm
41
Q

What are the six requirements of a clasp assembly?

A
  1. Support
  2. Stability
  3. Encirclement of more than 180 degrees
  4. Reciprocation
  5. Passivity
  6. Retention
42
Q

What do we mean when we say “support” is a requirement of a clasp assembly?

What component provides this?

A

Resists vertical movement toward tissue; rests

43
Q

What do we mean when we say “stability” is a requirement of a clasp assembly?

What component provides this?

A

Resists horizontal displacement; all areas above the survey line & all rigid components of direct retainer

44
Q

What do we mean when we say “Encirclement of more than 180 degrees” is a requirement of a clasp assembly?

Describe?

A

Prevents tooth from moving away from the clasp; may be continuous or broken; minimum of 3 points used

45
Q

What requirement of clasp assembly is represented in the following image?

A

Encirclement of more than 180 degrees

46
Q

What requirement of clasp assembly is NOT met in the following image?

A

Encirclement of more than 180 degrees

47
Q

When discussing the “reciprocation” requirement of clasp assembly, the reciprocal component must contact tooth at:

A

Same time or sooner than retentive clasp

48
Q

When discussing the “reciprocation” requirement of clasp assembly, the reciprocal component must remain in contact while:

A

Retentive tip passes over height of contour

49
Q

When discussing the “reciprocation” requirement of clasp assembly, the reciprocal component must resist:

A

Retentive tip lateral forces

50
Q

When discussing the “reciprocation” requirement of clasp assembly, this requires ______ to pathogenicity of insertion

A

Parallel surface

51
Q

In the following image, the red arrow is pointing at:

A

Reciprocal clasp

52
Q

What do we mean when we say “Passivity” is a requirement of a clasp assembly?

A

Components of direct retainer exert no force when fully seated

53
Q

What do we mean when we say “Retention” is a requirement of a clasp assembly?

A

Resists displacement of RPD away from supporting tissues

54
Q

What area of the clasp assembly serves to satisfy the “retention” requirement of the clasp assembly?

A

Area below the survey line; ideally in the gingival 1/3

55
Q

Where does the clasp arm tip need to be in order to satisfy the “retention” requirement of clasp assembly?

A

Terminal 1/3 below survery line

56
Q
A

Removable Partial Prosthodontics (12 decks)

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