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BDS3 Prosthodontics > BDS2 RPDS revision > Flashcards

BDS2 RPDS revision Flashcards

1
Q

What is a saddle area?

A

an edentulous aeea
- the area of missing teeth to be restored with a partial denture

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2
Q

what is a saddle?

A

part of the denture that carries the replacement prosthetic teeth to fill the edentulous area

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3
Q

types of saddle area

A

bounded saddle
free-end sadd

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4
Q

Kennedy Class I - define

A

bilateral free-end saddles

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5
Q

Kennedy class II - define

A

unilateral free-end saddle

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6
Q

Kennedy Class III - define

A

bounded saddle

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7
Q

Kennedy Class IV - define

A

Anterior bounded saddle
crossing the midline

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8
Q

Give the Kennedy classification for an anterior saddle that does not cross the midline?

A

Kennedy Class III

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9
Q

In dentures with multiple saddles, which saddle is used to classify the arch?

A

the most posterior saddle

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10
Q

Define the term ‘support’ in relation to partial dentures

A

the resistance of a denture to occlussally directed load

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11
Q

How to improve support for a denture?

A

utilise remaining natural teeth
spread load over large surface area (soft tissue)

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12
Q

Craddock class 1 - define

A

tooth borne

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13
Q

Craddock Class II - define

A

mucosal borne

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14
Q

Craddock class III define

A

a combination of hard and soft tissue coverage

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15
Q

tooth supported dentures - features

A

transmits load via periodontal membrane
allows supported denture base to feel like the natural dentition
is more comfortable for patient
protects soft tissues from trauma

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16
Q

mucosal supported dentures - features

A

must cover as large an area as possible
allows denture base to move slightly
- possible damage to adjacent gingival margins

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17
Q

Function of rests in RPDs

A

components which provide support for denture from vertical opposing forces

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18
Q

What material is usually used for rests

A

cast metal

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19
Q

Types of rests used in RPDS

A

cingulum, occlusal or incisal

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20
Q

Why are large rests more suitable than smaller rests?

A

they can direct force down the long axis of the tooth

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21
Q

benefits of occlusal rests

A

prevent movement of the RPD towards the mucosa
assist the distribution of occlusal load
prevent over eruption of unopposed teeth
can provide indirect retention

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22
Q

features of incisal rets

A

used mostly on lower anterior teeth
poor aesthetic appearance
may interferer with incisal occlusion

23
Q

Cingulum rests - features

A

preparation required if prominent cingulum not available
most commonly used on canines
aesthetically superior to incisal rests
less likely to breakage than incisal rets
applies stress at a lower level

24
Q

The default position to place a rest for a bounded saddle is…

A

immediately adjacent to the saddle

25
Q

The default position to place a rest for a free end saddle is…

A

NOT immediately adjacent to the saddle

26
Q

Rest position for tooth supported bases

A

Should be placed on the tooth surface nearest to the base

27
Q

Rest position for Craddock Class iii bases

A

should be placed on the tooth surface which is not next to the base
- opposite side of tooth from saddle area

28
Q

possible consequences of rest seats

A

destruction of tooth surface
exposure of dentine
loss of occlusal stop when denture is not worn

29
Q

Define ‘retention’ in reference to RPD design

A

the resistance of a denture to vertical dislodging forces

30
Q

How can retention be achieved in an RPD?

A

mechanical
- clasps
muscular
- shape of the denture
physical
- mucosal coverage

31
Q

indirect retention - define

A

resistance to rotational displacement of the denture

32
Q

What is a denture clasp?

A

a metal arm that, when in position, contacts the tooth preventing removal of the denture base

33
Q

where are denture clasps placed?

A

below the undercut of a tooth

34
Q

where are undercuts found?

A

below the most bulbous part of a tooth

35
Q

how are undercuts identified?

A

from surveying the cast

36
Q

Give the name for a gingival approaching clasp

A

I-bar clasp

37
Q

What is a gingivally approaching clasp?

A

a clasp that approaches the identified undercut via the gingival margin

38
Q

what is an occlsually approaching clasp?

A

a clasp that approaches the identified undercut from above the maximum bulbosity of the tooth

39
Q

types of occlusally approaching clasp

A

self reciprocating class
single arm clasp with separate reciprocating arm

40
Q

depth of undercut required to place a clasp in a CoCr framework

A

0.25mm

41
Q

Give examples of indirect retainers

A

major connectors
minor connectors
rests
saddles
denture base

42
Q

What is a connector?

A

the rigid part of a denture base that unites other components

43
Q

ideal features of a minor connector

A

rigidity
covers as little gingival tissue as possible
crosses the gingival margin at right angles
- to maintain gingival health

44
Q

Minor connectors - function

A

joins components such as rests to the major connector
provides indirect retention by resisting movement about the axis of rotation

45
Q

major connectors - ideal features

A

be ridges
avoid covering gingival margin s
be comfortable with as few edges as possible

46
Q

types of maxillary major connectors

A

palatal plate
posterior bar
anterior plate
mid palatal plate
horseshoe bar
horseshoe plate

47
Q

common connector choice for Craddock class 1 cases

A

bars

48
Q

connector choice for Craddock class 2 cases

A

plates

49
Q

types of mandibular connectors

A

lingual bar
dental bar
lingual plate
sub-lingual bar
lingual bar with dental bar

50
Q

RPI system use cases

A

distal extension RPDs
- Kennedy class 1 and class 2

51
Q

Which components make up an RPI system

A

mesial rest
proixmal guide plate
gingival approaching I-bar clasp

52
Q

Function of the RPI system

A

used in free end saddle designs to prevent stress on the last abutment tooth

53
Q
A

BDS3 Prosthodontics (5 decks)

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