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

RPD Design: saddle & support Flashcards

(58 cards)

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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

Study These Flashcards
A

it is compressive

25
what should first be considered in terms of support for dentures
tooth support
26
what are the best teeth for support
those with the largest root area depending on the health of the PDL attachment
27
how much can a healthy tooth potentially carry
its own load plus one and a half similar
28
how much more is periodontal membrane for support than the mucosal coverage of a lost tooth
4 times
29
how is tooth support provided
by metal alloy rests on the surface of adjacent abutment teeth
30
how do the rests transfer the load
down the long axis of the tooth
31
what are rests
the components which provide support for the denture from vertical forces
32
how are rests described
by the part of the tooth they contact - cingulum, incisal, occlusal
33
what are rests made out of
cast or wrought metal
34
what are the rests best used as a part of
cast metal denture framework
35
what do rests do
they oppose movement of the base towards the tissues
36
why is incorporating rests into acrylic resin a problem
due to low base strength | placing a metal component potentially weakens the acrylic surrounding it
37
what should occlusal rests be like
large rests are recommended as this can direct force down the long axis of the tooth
38
what are incisal rests
``` 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
what are cingulum rests
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
describe metal framework base
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
describe PMMA
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
what do tooth support rests do
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
what are additional uses of rests
reciprocation | indirect retention
44
what is the purpose of a rest
support denture against vertical load
45
why are rests often placed on the occlusal surface of a tooth
will direct occlusal forces of a tooth down the long axis fo the abutment teeth
46
what is the default position to place a rest for a bounded saddle
immediately adjacent to the saddle additional rests may be incorporated position may have to be changed depending on the opposing dentition
47
where is the rest placed on a free end saddle
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
where should the rest be positioned/placed in tooth supported bases
the support should be on the tooth surface nearest to the base
49
where should the rest be placed for tooth and mucosa supported base
the support should be on the tooth surface which is not next to the base
50
where should you avoid placing an occlusal rest
in an occlusal centric stop | the denture will be uncomfortable and interfere with the occlusion
51
what are the possible consequences of rest seats
loss of occlusal stop when denture is not worn destruction of tooth surface exposure of dentine
52
what is mucosal support dependent on
as large an area possible of mucosa being covered
53
what should be taken account when making up dentures with mucosal support
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
what is the Every partial denture design
mucosa borne denture which restores the dental arch; with contact points between the denture and abutment teeth
55
what is put in every partial design to ensure most distal tooth does not drift posteriorly
a wire stop is conor-orated
56
what is not covered by the Eveery denture design
gingival margins
57
what is an issue with tooth and mucosal support
different in compressibility between periodontium (vertical displacement of tooth attachment within its socket) and the mucoperiosteum
58
what does a uniform foundation allow in a denture
spreads load evenly and rest or sink depending on compressibility

BDS2 CLINICAL Prosthodontics (13 decks)

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