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Basic RPD > 4 Components of RPD > Flashcards

4 Components of RPD Flashcards

1
Q

Components of an RPD (6)

A
  1. Major connector
  2. Denture base
  3. Direct retainers
  4. Indirect retainers
  5. Guide planes
  6. Minor connector
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2
Q

The six components of an RPD provide what six features?

A
  1. Support
  2. Stability
  3. Retention
  4. Resistance
  5. Reciprocation
  6. Passivity
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3
Q

Major Connector - Features (3)

A
  1. Connect parts of prosthesis from one side of dental arch to the other
  2. All other parts are directly/indirectly attached
  3. Provides “cross-arch stability” and resists displacement from functional stresses
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4
Q

Major Connectors - Single Palatal Bar - Bar is less than __ mm in width (half oval __ gauge thickness)

A

8 mm

Half oval 6 gauge thickness

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5
Q

Major Connectors - Palatal strap - Strap is __ mm or greater in width and can be thinner (__ gauge)

A

8 mm

24 gauge

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6
Q

Major Connectors - AP strap

- AP strap is minimum __ to __ wide and Lateral strap are __ to __ wide

A

AP strap: 8-10 mm

Lateral strap: 7-9 mm

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7
Q

Major Connectors - at least __ mm away from free gingival margins

A

6 mm away

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8
Q

Major Connectors - Palatal plate

  • Recommended in Class __ RPD’s when canine or premolar is the most M/D? abutment
  • Maximizes support and __
A
  1. Class I RPD’s

2. Support and rigidity

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9
Q

What major connector should be used as a last support?

  • Why?
  • What situations warrant its use?
A
  1. Horseshoe / U shaped
  2. Lacks rigidity and support
  3. Great when inoperable torus or Kennedy Class III/IV
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10
Q

Mand. Major Connectors: Lingual bar

  • What shape is the bar and how tall?
  • How far away from free gingival margin?
A
  1. 1/2 pear shaped and 4 mm tall

2. 3-4 mm away from free gingival margin

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11
Q

Sublingual bar

  • What shape is the bar?
  • Used when you have too much or too little distance to floor of mouth? How much?
A
  1. 1/2 pear shape

2. Too little (less than 7-8 mm, because you need 4 mm from FGM)

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12
Q

Lingual plate

  • Used when you have too much or too little distance to FOM?
  • What shape is the bar?
  • You must have what design feature at the end of the plates?
A
  1. Too little (less than 7-8 mm)
  2. 1/2 pear shape
  3. Rest seats at terminal ends of plate
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13
Q 
Cingulum bar (located on cingula of anterior teeth)
 - Indicated when? (3)
A
  1. Indicated if too much blockout for lingual bar or if open embrasures of plate visible from anterior
  2. Also indicated to avoid large inoperable lingual tori
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14
Q

What mandibular major connector is used as a last resort?

A

Labial bar

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15
Q

Requirements of a clasp assembly (6)

A
  1. Support
  2. Stability
  3. Retention
  4. Resistance
  5. Reciprocation
  6. Passivity
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16
Q

Rest Seat Purpose (3)

  • Provides __
  • Maintains __ in their planned positions
  • Maintains occlusal relationships by preventing __
A
  1. Provide support
  2. Maintains components in their planned positions
  3. Maintains establish occlusal relations by preventing settling of the denture?
17
Q

Rest seats

  • Outline is what shape?
  • Width?
  • Depth?
  • Angle formed by occlusal rest and vertical minor connector should be greater/less than 90 degrees to direct forces where?
A
  1. Rounded triangle
  2. 2.5 mm width
  3. 1.5 mm depth
  4. Less than 90 degrees to direct along long axis
18
Q

Embrasure rests

- M-D dimension should be __ mm or big enough to hold two __ gauge wires

A

a. 2.54 mm

b. two 18 gauge wires

19
Q

Cingulum rests

  • Incisors or Canines preferred?
  • Keep far away or close to gingiva?
  • Max or Mand canines have thin enamel?
A
  1. Canines preferred
  2. Keep close to gingiva
  3. Mand canines have thin enamel
20
Q

Cingulum rests

  • M-D dimension
  • F-L dimension with __ depth
A

a. M-D: 2.5 to 3 mm

b. F-L: 2 mm with 1.5 mm depth

21
Q

Circumferential clasp - Adv (3) and Disadvantage (4)

A
  1. Retentive, stable, simple
  2. Covers more tooth than bar type, more metal display, adds bulky contour to tooth, and in 1/2 round profile, adjustments are difficult
22
Q

Ring clasp

  • Infra or supra bulge
  • Adv (1) and Disadvantages (3)
A
  1. Supra
  2. Flexibility due to greater length, must incorporate bracing strut to reduce flexibility, covers too much tooth structure
23
Q

Embrasure clasp

  • Infra or supra bulge?
  • Advantage (1)
  • Disadvantages (4)
  • Depth of prep
A
  1. Supra
  2. Allows cross-arch clasping when no mod. space
  3. High failure rate, significant tooth reduction, opposing teeth frequently interfere, and requires rests on both teeth
  4. 2.54 mm to fit two 18 gauge wires
24
Q

What clasps are great when the only available undercut lies close to the proximal plate?
- Disadvantages (4)

A

Reverse action clasp

  1. Covers a lot of tooth structure
  2. Food trap
  3. Generally widens occlusal table
  4. Unesthetic
25
Q

Bar clasp - Adv/disadv (2)

A

Adv: Less tooth coverage and more esthetic
Disadv: Tissue undercuts may require a lot of blockout causing food trap
- Length of clasp arm may be too flexible

26
Q

Utilization of an RPI changes the Class I lever to a Class __?

A

Class 2 lever

27
Q

RPI Designs - Kratovil

- Guide plane

A

Long guide plane, engaging as much tooth structure as possible

28
Q

RPI designs - Krol

- Guide plane

A

Guide plane contacts plate 1 mm of the gingival portion (approximately the junction of the occlusal and middle thirds of the crown)

29
Q

RPI designs - Demer

- Guide plane

A

Minimal guide plate prep and contacts 1 mm at height of contour (as occlusal as possible)

30
Q

RPA clasp (Eliason)

  • M/D rest?
  • What kind of clasp?
  • Used for Kennedy class?
  • Proximal 2/3rd of clasp arm MUST do what?
A
  1. M rest
  2. Aker’s clasp
  3. Kennedy Class I/II
  4. 2/3rd of arm must be on height of contour
31
Q

Twin flex clasp

  • CC or WW?
  • Used in distal extension and/or tooth borne?
  • Kennedy class?
  • Disadvantage?
A
  1. WW in 0.010””
  2. Tooth borne
  3. Class IV, sometimes III
  4. Difficult to adjust
32
Q

Features of ideal denture base material (9)

A
  1. Tissue adaptation accuracy
  2. Dense, non-irritating surface
  3. Thermal conductivity
  4. Low specific gravity
  5. Sufficient strength
  6. Easily kept clean
  7. Esthetic acceptability
  8. Future reline potential
  9. Low initial cost
33
Q

Acrylic denture base (ANSI/ADA Spec #12)

  • Adv (2)
  • Disadv (4)
A
  1. Able to reline and flanges can be contoured better

2. No thermal conductivity, less wear/abrasion resistance, requires bulk for strength, porosity

34
Q

Metal denture base (ANSI/ADA Spec #14)

  • Adv (4)
  • Disadv (
A
  1. Accurate, naturally cleaner, better thermal conductivity, less weight/bulk, acrylic retentive features
  2. Poor esthetics, cannot reline

Basic RPD (12 decks)

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