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P2 > RESTS AND REST SEATS, Direct And Indirect > Flashcards

RESTS AND REST SEATS, Direct And Indirect Flashcards

1
Q

_____ support must be provided for a removable partial denture.

A

Vertical

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2
Q

Any components of a partial denture on the tooth surface that provides vertical support is called a?

A

REST

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3
Q

T/F

Rests Should always be located on a properly prepared tooth surface.

A

T

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4
Q

The prepared surface of an abutment to receive the rest is called a?

A

“REST SEAT”.

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5
Q

In short rests serves as (4)

A

to support the position of a partial denture

to resist movement towards the tissue

to transmit vertical forces to the abutment teeth

to direct those forces along the axis of the teeth.

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6
Q

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

the outline form of an occlusal rest is ______ shape with apex towards the center of the occlusal surface.

A

ROUNDED TRIANGULAR

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7
Q

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

It should be as long as it is wide, the base of the triangular shape (at the marginal ridge) should be at least _____ mm for both molar and premolars

A

2.5

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8
Q

T/F

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

Rest seats of smaller dimensions do not provide an adequate bulk for rest.

A

T

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9
Q

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

The marginal ridge of the abutment tooth at the site of the rest seat must be _____ to the abutment tooth at the site of the rest seat must be lowered to permit a sufficient bulk of metal for strength ad rigidity.

o Reduction of the marginal ridge of approximately ____ mm is usually necessary.

A

lowered

1.5

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10
Q

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

The floor of the occlusal rest seat should be ___ to the marginal ridge

A

apical

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11
Q

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

The occlusal surface should also be ____ shaped or ____.

A

spoon

concave

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12
Q

KENNEDY CLASS III, Modification 1, maxillary arch with rest seats prepared on the lingual surface of the canine and lateral incisor and on the occlusal surfaces of the premolar and molar.

The angle formed by the occlusal rest and vertical minor connector from which it originates should be _____

A degree _____ fails to transmit occlusal forces along the supporting vertical axis of the abutment tooth.

A

less than 90

more than 90 °

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13
Q

The floor of the occlusal rest should be inclined _____ from the lowered marginal ridge. Any angle less than 90 degree is acceptable as long as the preparation of the proximal surface and lowering and rounding of the marginal ridge precede completion of the rest seat itself

A

apically

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14
Q

T/F

A lingual rest is preferable than incisal rest because it is placed close to the horizontal axis of rotation of the abutment and therefore has less tendency to tip the tooth.

A

T

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15
Q

T/F

Lingual rests are more esthetically acceptable than incisal rests

A

T

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16
Q

T/F

In LINGUAL REST ON CANINES AND INCISOR TEETH

If an anterior tooth is lingually slope rather than perpendicular line the lingual rest if sometimes placed at the cingulum or just incisally to the cingulum.

A

T

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17
Q

T/ F

In LINGUAL REST ON CANINES AND INCISOR TEETH
Is Usually confined to maxillary canines that have gradual lingual incline and a prominent cingulum

A

T

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18
Q

In LINGUAL REST ON CANINES AND INCISOR TEETH

A _____-like shape which provides a positive rest seat located favorably in relation to the long axis of the tooth is formed.

A

saddle

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19
Q

The lingual rest may be placed on the surface of a [6]

A
  1. Cast veneer crown.
  2. A three-quarter crown.
  3. Inlay
  4. Laminate veneer
  5. Composite restoration
  6. Etched metal restoration
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20
Q

it is least desirable placement of rest seats previously mentioned, it may be used successfully for selected patients when the abutment is sound and when a cast restoration is not otherwise indicated.

A

INCISAL REST & REST SEATS

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21
Q

Used predominantly as auxiliary rest or as an indirect retainer.

A

INCISAL REST & REST SEATS

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22
Q

It is applicable to mandibular canine; only applicable to mandibular teeth.

A

INCISAL REST & REST SEATS

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23
Q

It is applicable to mandibular canine; only applicable to mandibular teeth.

A

INCISAL REST & REST SEATS

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24
Q

Esthetically it is preferable to the three-quarter crown.

A

mandibular canine (INCISAL REST & REST SEATS)

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25
Q

T/F

Incisal rest is more likely to lead to some orthodontic movement of the tooth because of unfavorable leverage factor than is a lingual rest.

A

T

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26
Q

An incisal rest is prepared in the form of a ___ ____ at the incisal edge of an incisor.

A

rounded notch

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27
Q

In INCISAL REST & REST SEATS

The notch should be ___ both labially and lingually

A

beveled

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28
Q

An incisal rest should be approximately ____ mm wide & ____ mm deep.

A

2.5 mm wide

1.5 mm deep

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29
Q

T/F

The incisal rest should be under contoured slightly to allow labial and incisal finishing to the adjoining enamel.

A

FALSE

The incisal rest should be OVER contoured slightly to allow labial and incisal finishing to the adjoining enamel.

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30
Q

What are DIRECT RETAINERS?
(2)

A

INTRACORONAL RETAINER

EXTRACORONAL RETAINER

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31
Q

is that quality of a removable partial denture which resists the forces of gravity, the adhesiveness of foods, and the forces associated with opening the jaws.

A

Retention

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32
Q

that component of a removable partial denture used to retain and prevent dislodgement, consists of a clasp assembly or precision attachment.

A

Direct Retainer

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33
Q

retention obtained in a removable partial denture by the use of clasps or attachments that resist removal from the abutment teeth

A

Direct Retention

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34
Q

retention obtained in a removable partial denture by the use of clasps or attachments that resist removal from the abutment teeth

A

Direct Retention

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35
Q

may be cast or may be attached totally within the restored natural contours of an abutment tooth.

A. INTRACORONAL RETAINER
B. EXTRACORONAL RETAINER

A

A

36
Q

typically composed of a prefabricated machined key
and keyway with opposing vertical parallel walls.

A. INTRACORONAL RETAINER
B. EXTRACORONAL RETAINER

A

A

37
Q

usually regarded as an internal, precision
attachment.

A. INTRACORONAL RETAINER
B. EXTRACORONAL RETAINER

A

A

38
Q

also known as clasp-type

A. INTRACORONAL RETAINER
B. EXTRACORONAL RETAINER

A

B

39
Q

most commonly used retainer for RPD

A. INTRACORONAL RETAINER
B. EXTRACORONAL RETAINER

A

B

40
Q

mechanical resistance to displacement through
components placed on or attached to the external surfaces of an abutment tooth.

A

EXTRACORONAL RETAINER

41
Q

DIRECT RETAINERS ARE COMPOSED OF:

A
  1. Minor Connectors
  2. Rest
  3. Retentive Arm
  4. Non-Retentive Arm/Reciprocating Arm
  5. Occlusal Rest
42
Q

from which clasp components originate

A

Minor Connectors

43
Q

designed to direct stress along the long axis of the tooth.

A

Rest

44
Q

should engage a tooth undercut. For most clasps, the retentive region is only at its terminus.

A

Retentive Arm

45
Q

should be present on the opposite side of the tooth for stabilization and reciprocation against horizontal movement of the prosthesis (rigidity of clasp arm is essential to it’s purpose

A

Non-Retentive Arm/Reciprocating Arm

46
Q

Function of rest and its location

A

support

occlusal, lingual, incisal

47
Q

MINOR CONNECTOR
- Function
- Location;

A

stabilization

proximal surfaces extending from a prepared marginal ridge to the junction of the middle and gingival third of abutment crown.

48
Q

CLASP ARMS
- Function;
- Location;

A

-Stabilization (reciprocation) & Retention

-middle third of crown, gingival third of crown in measured undercut.

49
Q

REQUIREMENTS OF DIRECT RETAINERS

A

Support

Reciprocity

Bracing and Stability

Retention

Encircle more than 180 degrees.

Passivity

50
Q

T/f

Rests prevent clasp from being displaced
in gingival direction.

A

T

51
Q

Bracing arms, minor connectors

A

Reciprocity

52
Q
  • resists horizontal movement
  • Rest, minor connectors , bracing arms
A

Bracing and Stability

53
Q

T/F

passive at rest, activated only during dislodgement

A

T

54
Q

this design is most frequently used on the side of
the arch where there is no edentulous space

A

Embrasure Clasp

55
Q

● occlusal rests must be used to support the
embrasure portions of the clasp
● should be used with double occlusal rests.

A

Embrasure Clasp

56
Q

Indication
- tilted abutments
- most posterior abutments
- usually mesially/ lingually tilted mandibular
molars.

A

Ring Clasp

57
Q

it is used when a proximal undercut cannot
be approached by undercut means

A

Ring Clasp

58
Q

should always be used with a supporting strut on the non-retentive side, with or without an auxiliary occlusal rest on the
opposite marginal ridge.

A

Ring Clasp

59
Q

Design
- clasp approaches undercut from edentulous area and engages undercut opposite to edentulous space.

A

Circumferential/Akers clasp

60
Q

correct form of this clasp has only one retentive clasp arm, opposed by a non-retentive reciprocal arm on the opposite side.

A

Circumferential/Akers clasp

61
Q

Indication
- Tooth supported partial denture

A

Circumferential/Akers clasp

62
Q

Contraindication
- They cannot be used for distal extension cases as they engage the mesiobuccal undercut.

A

Circumferential/Akers clasp

63
Q

Hairpin Clasp

A

Reverse Action Clasp

64
Q

A simple circlet clasp in which the retentive arm
loops back to engage an undercut apical to the
point of origin.

A

Reverse Action Clasp

65
Q

used when a distofacial undercut is present
adjacent to the edentulous space

A

Reverse Action Clasp

66
Q

Consists of:
- retentive arm arising from one side of the tooth

A

Half and half clasp

67
Q
  • a reciprocal arm arising from the other direction on the opposite side of the tooth.
  • two minor connectors
A

Half and half clasp

68
Q

Indications
- Usually, it is used with isolated premolars and molars bounded and free end partial dentures

A

Half and half clasp

69
Q

A circumferential clasp which extends to neighboring teeth in order to provide increased splinting and stabilizing and to engage a more favorable undercut.

A

Extended Arm Clasp

70
Q

Indication
- used when the undercut on the tooth near the edentulous area is poor, while that on the adjacent tooth is suitable.

A

Extended Arm Clasp

71
Q

Advantages
- The clasp has splinting action
- Distributes lateral load over the two teeth.

A

Extended Arm Clasp

72
Q

Best Esthetics

A

Infrabulge Arm Clasps

73
Q

I-bar most common
- minimal contact w/ tooth surface so no
food accumulation
- minimal show of metal
- same function as other clasps

A

Infrabulge Arm Clasps

74
Q

Engages 0.01 inch undercut

Provides unilateral bracing

A

Infrabulge Arm Clasps

75
Q

“Y”, “T”, modified “T” and “U” less useful.

A

Infrabulge Arm Clasps

76
Q

● modification of the ring clasp with the same advantages and apparently no disadvantages
● difficult to justify it’s use.

A

Back-action Clasp

77
Q

simply two opposing circumferential clasps joined at the terminal end of the two reciprocal arms.

A

Multiple Clasp

78
Q

used when additional retention and stabilization are needed, usually on tooth-supported partial dentures.

A

Multiple Clasp

79
Q

may be used for multiple clasping in instances in which the partial denture replaces an entire half ot the dental arch.

A

Multiple Clasp

80
Q

R- REST (always mesial)
P - ________ (distal)
I - ____(buccal)

A

PROXIMAL PLATE

I-BAR

81
Q

During function, proximal plate and I-bar clasp move in ______ direction - disengaging tooth

A

mesiogingival

82
Q

When tissue undercuts begin from 3 mm away from the gingival margin, an ____ clasp is used no matter how deep the facial surface tissue under cut.

A

RPI

83
Q

R - REST (always_____)
P - PROXIMAL PLATE (distal)
A - _________ARM ( always wrought wire)

A

mesial

AKER’S RETENTIVE

84
Q

this distributes more functional load to edentulous ridge.

A

R- REST (always mesial)
P - PROXIMAL PLATE (distal)
I - I-BAR (buccal)

85
Q

Indications:
- in distal extension cases, as it provides a stress releasing action.
- when tissue undercuts are not severe
- when esthetic is important

A

R- REST (always mesial)
P - PROXIMAL PLATE (distal)
I - I-BAR (buccal)

86
Q

in distal extension RPDs present with
shallow vestibule or severe tissue undercut.

A

R - REST (always mesial)
P - PROXIMAL PLATE (distal)
A - AKER’S RETENTIVE ARM ( always wrought wire)

87
Q

when tissue undercuts begin less than 3 mm from the gingival margin and are more than 1 mm in depth, an ____ may be used.

A

RPA

P2 (6 decks)

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