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BDS2 CLINICAL Prosthodontics > RPD Design: saddle & support > Flashcards

RPD Design: saddle & support Flashcards

1
Q

what is a saddle area

A

edentulous area - where the replacement teeth will sit

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2
Q

what is a denture base

A

is it the connecter

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3
Q

what is the flange

A

it is the replacement tissue

it extends from the alveolar ridge into the vestibular sulcus

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4
Q

what is the system of design with dentures

A

will a prosthesis be made?
what type of prosthesis?
what teeth will be replaced and why?
how will occlusal loading be resisted by the denture?
how will denture be retained
how will the denture resist horizontal movement
how will the components be joined

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5
Q

what are the basic system of design steps

A 
saddles
support
retention
bracing and reciprocation
connector
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6
Q

what is kennedy classification

A

an anatomical classification that describes the number and distribution of the saddle area

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7
Q

what teeth are ignored in kennedy classification

A

third molars

unless they play a direct part in denture design

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8
Q

what saddle defines classification

A

most posterior

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9
Q

what is class I KC

A

bilateral free end

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10
Q

what is class II KC

A

unilateral free end

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11
Q

what is class III KC

A

unilateral bounded

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12
Q

what is class IV KC

A

anterior bounded (crossing midline)

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13
Q

what is each additional saddle area referred to as

A

a modification

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14
Q

what is meant by support

A

a term used to describe the resistance of a denture to occlusal directed load

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15
Q

what are the options for resisting movement towards the tissue

A

utility of hard tissue

spread the load over a large surface area

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16
Q

what is tooth support

A

prevents/resists movement, directs load through PDL of adjacent teeth

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17
Q

what is mucosal support

A

needs a large surface area so that the load is distributed over a wide area

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18
Q

what is craddocks classification

A

simple classification based on support for a removable partial denture
only gives the type of support and does not tell anything about distribution or number of the teeth

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19
Q

what is class I CC

A

tooth support

they provide a HARD tissue resistance to occlusal loading

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20
Q

what is class iI CC

A

mucosa

a large coverage provides resistance to occlusal loading

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21
Q

what is class III CC

A

tooth & mucosa

a combination of hard tissue and large coverage when there is a reduced number of teeth and a large edentulous saddles

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22
Q

describe tooth support

A

transmits load via the periodontal membrane
allows the supported denture base to feel like the natural dentition
is more comfortable for the patient
protects the soft tissues from trauma
is likely to stay in close contact with its supporting structures over a period of time

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23
Q

describe mucosal support

A

must cover as large an area as possible - reduction of the occlusal table
allows the denture base to move slightly which could result in potential damage to adjacent gingival margins

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24
Q

why does the denture move with mucosal support

A

it is compressive

25
Q

what should first be considered in terms of support for dentures

A

tooth support

26
Q

what are the best teeth for support

A

those with the largest root area depending on the health of the PDL attachment

27
Q

how much can a healthy tooth potentially carry

A

its own load plus one and a half similar

28
Q

how much more is periodontal membrane for support than the mucosal coverage of a lost tooth

A

4 times

29
Q

how is tooth support provided

A

by metal alloy rests on the surface of adjacent abutment teeth

30
Q

how do the rests transfer the load

A

down the long axis of the tooth

31
Q

what are rests

A

the components which provide support for the denture from vertical forces

32
Q

how are rests described

A

by the part of the tooth they contact - cingulum, incisal, occlusal

33
Q

what are rests made out of

A

cast or wrought metal

34
Q

what are the rests best used as a part of

A

cast metal denture framework

35
Q

what do rests do

A

they oppose movement of the base towards the tissues

36
Q

why is incorporating rests into acrylic resin a problem

A

due to low base strength

placing a metal component potentially weakens the acrylic surrounding it

37
Q

what should occlusal rests be like

A

large rests are recommended as this can direct force down the long axis of the tooth

38
Q

what are incisal rests

A 
extended from denture base framework 
used mostly on lower anterior teeth
poor aesthetic appearance 
may interfere with incisal occlusion 
not recommended on wear facets
39
Q

what are cingulum rests

A

extended from the denture base framework
unless prominent cingulum is available a preparation is required to provide a vertical stop
used most on maxillary and mandibular canines and can be used on maxillary incisors and laterals
aesthetically superior to incisal rests
apply stress at lower levels - less rotational forces
less likely to breakage

40
Q

describe metal framework base

A

CoCr
rigid and strong
all rests are integral to the base connected to the major connect directly or by minor connectors
the base is produced by casting using a lost wax technique

41
Q

describe PMMA

A

flexible (not rigid) and poor strength
rests are incorporates mechanically into the base
any load is resisted by the rests through the denture base placing an internal stress on the base material
rests for support within an acrylic base are the exception rather than the rule although it can be used when opposing forces are light e.g complete denture

42
Q

what do tooth support rests do

A

prevent movement of an RPD towards the mucosa
assist in distribution occlusal load
direct retentive elements to work in a planned manner
prevent over-eruption of unopposed teeth
provide bracing on anterior teeth
determine the axis of rotation for free-end saddle RPDs

43
Q

what are additional uses of rests

A

reciprocation

indirect retention

44
Q

what is the purpose of a rest

A

support denture against vertical load

45
Q

why are rests often placed on the occlusal surface of a tooth

A

will direct occlusal forces of a tooth down the long axis fo the abutment teeth

46
Q

what is the default position to place a rest for a bounded saddle

A

immediately adjacent to the saddle
additional rests may be incorporated
position may have to be changed depending on the opposing dentition

47
Q

where is the rest placed on a free end saddle

A

not immediately adjacent to the saddle
we do not want to compromise the abutment by having axial torus on it
we try to mitigate this by having the rest on the medial surface of the abutment tooth

48
Q

where should the rest be positioned/placed in tooth supported bases

A

the support should be on the tooth surface nearest to the base

49
Q

where should the rest be placed for tooth and mucosa supported base

A

the support should be on the tooth surface which is not next to the base

50
Q

where should you avoid placing an occlusal rest

A

in an occlusal centric stop

the denture will be uncomfortable and interfere with the occlusion

51
Q

what are the possible consequences of rest seats

A

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

52
Q

what is mucosal support dependent on

A

as large an area possible of mucosa being covered

53
Q

what should be taken account when making up dentures with mucosal support

A

since soft tissue is compressible it is inadvisable to place the base within 3mm of the gingival margins are, this will place pressure at the gingival margin

54
Q

what is the Every partial denture design

A

mucosa borne denture which restores the dental arch; with contact points between the denture and abutment teeth

55
Q

what is put in every partial design to ensure most distal tooth does not drift posteriorly

A

a wire stop is conor-orated

56
Q

what is not covered by the Eveery denture design

A

gingival margins

57
Q

what is an issue with tooth and mucosal support

A

different in compressibility between periodontium (vertical displacement of tooth attachment within its socket) and the mucoperiosteum

58
Q

what does a uniform foundation allow in a denture

A

spreads load evenly and rest or sink depending on compressibility

BDS2 CLINICAL Prosthodontics (13 decks)

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