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BDS2 OSCE > RPD > Flashcards

RPD Flashcards

1
Q

support

A

resistance to occlusally directed load

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2
Q

Kennedy class I

A

bilateral free end saddles

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3
Q

Kennedy class II

A

unilateral free end saddle

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4
Q

Kennedy class III

A

bounded saddle

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5
Q

Kennedy class IV

A

anterior bounded saddle crossing the midline

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6
Q

craddock class 1

A

tooth borne - teeth provide hard tissue resistance to occlusal loading

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6
Q

craddock class 1

A

tooth borne - teeth provide hard tissue resistance to occlusal loading

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7
Q

craddock class 2

A

mucosa borne - large soft tissue coverage provides resistance to occlusal loading

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8
Q

craddock class 3

A

tooth and mucosa borne - reduced teeth and large edentulous spaces

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9
Q

why is tooth support better

A 
transmits load through PD membrane 
protects soft tissue 
comfortable 
more natural 
likely to stay in close contact with supporting structures
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10
Q

disadvantages of mucosa borne

A

may damage gingival margins

more likely to displace

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11
Q

types of rest

A

occlusal, cingulum, incisal

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12
Q

retention

A

resistance to vertical displacement of denture - given by clasps

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13
Q

best teeth for support

A

those with large roots i.e. molars then canines

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14
Q

clasp thickness

A

CoCr 0.25mm, Au 0.5mm, Stainless Steel 0.75mm

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15
Q

2/3s of clasp

A

should be above survey line

16
Q

terminal 1/3 of clasp

A

should be below survey line engaging the undercut

17
Q

guide planes

A

bounded saddles
2 or more parallel axial surfaces on abutment teeth
can occur naturally
more often need to be prepared
large the guide surface the more efficient it is
limit tilt and improve stability

18
Q

frictional retention

A

guide planes

19
Q

indirect retention

A

resistance to rotational displacement of denture

20
Q

examples of indirect retainers

A

major connectors, minor connectors, rests, saddle, denture base

21
Q

RPI system

A

mesial rest
proximal plate (adjacent to saddle) guide surface of 2-3mm
I-bar clasp (gingivally approaching) at greatest prominence of tooth contour

22
Q

open vs closed major connectors

A

open - greater clearance but reduced retention

closed - more contact, greater retention, guide planes but increased irritation

23
Q

plates

A
  • can be thin in x section and maintain rigidity
  • only recommended in mandibular arch when there is no space for a bar as they will cover gingival margin
  • when less tooth support plates with confer mucosal support
  • 0.5mm thickness
24
Q

bars

A
  • less coverage of gingival margins
  • must be thick to maintain rigidity
  • 2mm thickness
  • default connector in mandibular arch
25
Q

lingual bar

A

need 8mm space:
3mm distance from gingival margin
4mm height of bar (thickness)
1mm above floor of mouth

26
Q

minor connectors

A

join components such as rests to major connector and transfer functional stresses to and from the abutment teeth

27
Q

sub lingual bar

A

4mm thickness

28
Q

path of insertion

A

path followed by denture from first contact with teeth/tissue until it fully seats

29
Q

common path of displacement

A

90 degrees to the occlusal plane (horizontal)

30
Q

why do we survey

A

to determine the path of insertion

31
Q

why do we tripod

A

records common path of displacement as well as insertion and withdrawal so it casts can be relocated to here

32
Q

how to survey

A

position cast on surveyor table
orientate to common path of displacement
place ruler on cast
tripod
use analysing rod to eyeball cast for undercuts of abutments and associated soft tissues
use graphite rod to to mark upper and lower survey lines on teeth and soft tissues

33
Q

what surveyor do we use

A

ARCON - average value arcon

34
Q

survey lines

A

indicate the extent of the undercut - below the line must be used or blocked out

BDS2 OSCE (8 decks)

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