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BOARDs > Prosthodontics: RPD > Flashcards

Prosthodontics: RPD Flashcards

1
Q

Kennedy Class I

A

Bilateral Distal Extension

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2
Q

Kennedy Class II

A

Unilateral Distal Extension

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3
Q

Kennedy Class III

A

Unilateral Bounded Edentulous Space (BES)

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4
Q

Kennedy Class IV

A

Bilateral BES (Crosses Midline)

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5
Q

Applegate’s Rules

A
  1. Classify after All extractions
  2. Do not consider Missing 3rd molars
  3. Consider Abutment 3rd molars
  4. Do Not Consider Missing 2nd Molars
  5. Most posterior edentulous area determines classification
  6. Other edentulous areas=modifications
  7. extent of modification doesn’ t matter, only number
  8. Class IV can NOT have any modifications
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6
Q

Major Connector

A

central component of metal framework
* connects all components

Provides rigidity

Not placed on movable tissue (Only on palate or lingual aspect of alveolar ridge)

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7
Q

Maxillary Major Connectors: Types

A

Should cross midline at 90 degrees

Types:
* complete palatal plate
* Horseshoe
* Palatal Strap

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8
Q

Complete Palatal Plate

A

Most Rigid Maxillary Major Connector

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9
Q

When is a complete palatal plate for maxillay major connector indicated?

A
  • all posterior teeth are missing bilaterally (Class 1)
  • shallow palatal vault
  • periodontally compromised teeth
  • small mouth
  • flat or flabby alveolar ridges
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10
Q

Horse Shoe major connector

A

Least Rigid Maxillary Major Connector

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11
Q

When is a horse shoe major connector indicated to use?

A

Large palatal torus

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12
Q

Palatal Strap

A

Maxillary Major Connector
* metal strap that goes from L to R

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13
Q

Beading

A

Only for Maxillary Major Connectors

0.5 mm round groove in the cast at the borders of the major connector
* Adds Strength
* maintains tissue contact=prevent food impaction

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14
Q

What are the different types of mandibular major connectors?

A

Lingual Bar
Lingual Plate
Labial Bar (Aka Swinglock)

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15
Q

Lingual Bar

A

Mandibular Major Connector
* Lingual vestibule depth >/= 7mm
* simplest
* most common

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16
Q

Lingual Plate

A

Mandibular Major Connector

Indications
* Lingual vestibule depth < 7 mm
* anticipate more tooth loss
* Lingual Tori
* Bilateral Missing Posterior Teeth(Class 1)

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17
Q

Labial Bar

A

mandibular Major connector
* aka Swinglock

Indicated when:
* missing canine
* unfavorable soft tissue contour
* questionable perio prognosis

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18
Q

Minor Connectors

A

connect major connectors to rests, indirect retainers, and clasps

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19
Q

Rest

A

Rigid extension of RPD framework
* contacts occlusal, lingual, or incisal surface of abutment tooth

Provides Support
* directs forces down long axis

20
Q

Rest Seat

A

Prepped into occlusal, lingual or incisal surface of abutment tooth
* receive and support rest

21
Q

Occlusal Rest

A

Spoon Shaped
* rounded, semicircular outline form

1/3 MD width
1/2 intercuspal width (B/L)
1.5 mm depth

Floor inclines apically toward center
* < 90 degrees w/vertical minor connector

22
Q

Cingulum Rest

A

Inverted V or U Shape

2.5-3 mm MD Length
2 mm B/L Width (ledge)
1.5 mm Deep

23
Q

What are the benefits of a cingulum rest?

A

Distribute occlusal load (good)
esthetics
strength–due to how close they are to major connector (Dont need minor connector)

24
Q

When are cingulum rests contraindicated?

A

Mandibular Incisors

25
Q

Incisal Rests

A

Rounded notch at incisal angle
* used as indirect retainer
* less favorable leverage than lingual rest
* not esthetic

2.5 mm MD Length
1.5 mm Depth

26
Q

Proximal Plate

A

Metal plate that contacts proximal surface of abutment tooth

27
Q

Guide Planes

A

path of insertion and removal

1/3 Buccolingual width
extends 2-3 mm down from marginal ridge

28
Q

Indirect Retainer

A

Indirect retainer
* perpendicular and anterior to fulcrum line (Axis of rotation)
* fulcrum line=line through most distal rests
* anti-rotation of distal extension area

29
Q

What does a Direct Retainer consist of?

A

Aka Clasp Assembly
Consists of:
Rest: Support

Minor Connector: Stability

Clasp Arms
* Retentive Clasp Arm: Retention
* Reciprocal Clasp Arm: Stability

30
Q

Direct Retainer: Extracoronal Retainer vs Intracoronal Retainer

A

Extracoronal Retainer:
* more common
* conventional clasp design
* encircles tooth at least 180 degrees

Intracoronal Retainer:
* precision attachment
* key and keyway pattern
* most esthetic bc no clasps

31
Q

Retentive Clasp

A

Originates from minor connector & rest

Contacts tooth below HOC/Survey Line
* Retention

32
Q

Reciprocal Clasp

A

Aka Stabilizing Clasp
* Stability

Contacts tooth Above HOC/Survey Line
* not torqued by retentive clasp

33
Q

Suprabulge vs Infrabulge Clasps

A

Suprabulge: Originate above survey line/HOC

Infrabulge: Orginate below survey line

34
Q

What are some examples of suprabulge clasps?

A
  • circumferential (Akers)
  • Ring
  • Combination
  • Embrasure
35
Q

What are some examples of infrabulge clasps?

A
  • I Bar
  • T Bar
  • Bar Type
  • Y Type
36
Q

Circumferential Clasp

A

Aka Akers Clasp
* Most commonly used
* rest seats adjacent to edentulous space

37
Q

Ring Clasp

A

Suprabulge

undercut=adjacent to BES
* molars and MF undercut

38
Q

Embrassure Clasp

A

Suprabulge

Rests on both teeth
* so clasps don’t wedge teeth apart

39
Q

T-Bar

A

Infrabulge
* T-Bar
* Modified T-Bar (R Bar)

40
Q

I-Bar

A

Infrabulge

  • needs enough vestibular depth
  • No Soft Tissue undercut
41
Q

RPI

A

Type of Direct Retainer
* Rest, Proximal Plate, I bar
* M Rest

42
Q

RPA

A

Aka RPC
Type of Direct Retainer
* Rest, Proximal Plate, Akers/Circumferential

43
Q

Clasp Selection: General Rules
* BES vs Distal Extensions

A

BES:
* use Akers clasps
* rest seats adjacent to edentulous space

Distal Extensions: (order of preference)
1. RPI
2. RPA
3. Wrought Wire

44
Q

Wrought Wire Indications

A

Periodontally Compromised tooth
Endo-Treated tooth

More Flexible
seperately positioned and sauntered onto framework
Less torque on teeth

45
Q

Cobalt Chromium

A

Framework material

2.3% shrinkage
* causes irregularities & porosity

Cold-working (aka plastic deformation or work hardening)
* manipulate metal at ambient temp
* Main reason why clasps break

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