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dds2-prostho > Module 4 - RPD > Flashcards

Module 4 - RPD Flashcards

1
Q

properties of RPD

A
  • support
  • stability
  • retention
  • reciprocation
  • indirect retention
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2
Q

what do you add if you might lose a poor tooth and get a fulcrum line

A

indirect retainer

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3
Q

when do you need indirect retention

A
  • kennedy class 1 and 2
  • sometimes class 4
  • kennedy class 3 ONLY IF you will lose the last tooth
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4
Q

denture base extends to __

A
  • max: tuberosity

- mand: retromolar area. buccal flange to the vestibule. lingual flange to the depth permitted by mm

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5
Q

where does the external line start

A

2 mm lingual to the lingual surface of denture teeth

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6
Q

3 functions of tissue stops

A
  1. SUPPORT for distal extension base during metal framework try-in
  2. SPACE for packing acrylic under metal during processing
  3. facilitates RELINING in the future (if needed)
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7
Q

3 functions of rest seats

A
  1. prevent impingement of soft tissues
  2. maintain occlusal relationship (prevent denture from settling)
  3. directs occlusal load to abutment teeth (along their long axis)
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8
Q

dimensions for rest seat

A

1/2 BL distance

1/3-1/4 MD distance

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9
Q

how much restorative space do you need (from opposing tooth)

A

1.5 mm

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10
Q

dimensions of cingulum rest

A

MD: 2.5-3mm
BL: 1mm at margins, 1.5 at center
height: 1.5mm
*2mm away from gingiva

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11
Q

height of guide plane

A

2-3mm

  • 2mm away from gingiva
  • go past line angles
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12
Q

3 functions of guide planes

A
  1. guide to placement/removal of RPD
  2. reciprocation
  3. auxillary retention (provides friction, when you can’t use a clasp)
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13
Q

6 requirements of major connectors

A
  1. properly located
  2. avoids bony and soft tissue prominence
  3. not impinging on marginal gingiva
  4. rigid (to transmit stresses)
  5. not covering tissue
  6. not trapping food or providing retention
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14
Q

what happens if your major connector is not rigid enough

A

fracture, bc it cannot transfer stresses to the other arch during mastication

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15
Q

does the major connector contribute to retention

A

no

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16
Q

what components provide support

A
  • rests

- major connector (in the maxilla)

17
Q

where are support, stability, and retention found on a tooth

A
  • support (occlusal third)
  • stability (middle third)
  • retention (below HOC)
18
Q

what components provide stability

A

ALL COMPONENTS

  • mainly minor connector
  • lingual rest seats
  • bracing arm of clasp
  • teeth on other side of the arch
  • major connector
  • denture base
19
Q

what components provide retention

A
  • retentive arm of the clasp
  • minor connectors
  • denture base
20
Q

if you only replace teeth on one side of the arch, you will have less ___

A

stability

21
Q

acrylic dentures lack __ so they have less __

A

lack rest seats and bracing arm; so less support

22
Q

distance between gingival margin and major connector

A

6 mm

23
Q

where does the fulcrum line go

A

from most distal rest seats

24
Q

what happens if you have K class 1/2, class 1 lever, and resorption

A

pressing down causes denture to go down and clasp comes up => extraction or fracture of tooth

25
Q

when do you have class 1 levers

A

kennedy class 1/2, sometimes 4

26
Q

patient with kennedy class 2 has tooth pain. what do you check for?

A

resorption => could be class 1 lever causing tooth pain => do a reline

27
Q

effort arm direction

A 
class 1 lever - down
class 2 lever - up
28
Q

function of indirect retainer

A

prevent displacement of dentures with distal extension away from tissues

29
Q

class 2 lever is the solution to__

A

kennedy class 1/2 with class 1 lever (otherwise you have dislodgement of tooth, esp w resorption)

30
Q

indirect retainer is the solution to__

A

kennedy class 1/2 with class 2 lever, if you eat sticky food the denture rotates about the fulcrum (effort arm is upward)

31
Q

what do K class 1/2 require

A
  • class 2 lever (RPI, RPA, or CC)

- indirect retainer

32
Q

how does indirect retainer prevent rotation along fulcrum line

A

changes the location of fulcrum by increasing length of RESISTANCE ARM

dds2-prostho (1 decks)

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