Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BDS2 CLINICAL Prosthodontics > RPD DESIGN - SUPPORT > Flashcards

RPD DESIGN - SUPPORT Flashcards

1
Q

What is support defined as

A

RESISTANCE of a denture to OCCLUSALLY DIRECTED load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

During function, what are the forces transmitted through

A

the denture saddle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the forces transmitted during function resisted by

A

bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Describe a tooth borne denture

A

The denture is supported by the adjacent teeth by components such as occlusal rests, the force is transmitted to bone via teeth and periodontal ligaments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does a tooth borne denture work

A

It provides a HARD tissue resistance to occlusal loading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Describe a mucosa borne denture

A

The denture rests on the MUCOPERIOSTEUM then the force is transmitted through that tissue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is required for mucosal support

A

a LARGE SURFACE AREA is required to distribute the load over a wide area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do mucosa borne dentures work

A

the large coverage provides resistance to the occlusal loading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is a mucosa and tooth borne denture

A

Where there is a combination of HARD and LARGE coverage when there are reduced number of teeth and large edentulous areas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is craddock class 1

A

tooth borne denture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is craddock class 2

A

mucosa borne denture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a craddock class 3 denture

A

tooth and mucosa borne

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the advantages of a tooth support denture

A

Allows the supported denture base to feel like natural dentition
Is more comfortable to the patient
Protects the soft tissue from trauma
Is likely to stay in close contact with its supporting structures over a period of time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the disadvantage of a mucosal supported denture

A

allows the denture base to move slightly

possible damage to adjacent gingival margins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Where is a mucosa borne denture most likely to be successful

A

A mucosa borne denture is more likely to be successful in the maxillary jaw as palatal coverage ensures more effective support - a mucosa borne denture in the mandibular jaw often causes tissue damage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does planning support depend on

A

root area of abutment teeth
extent of saddles
expected force on saddle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What do you think about when looking at root area of abutment teeth

A

Area of root available to accept vertical forces governed by type of tooth and periodontal health

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the tooth with the least root

A

mandibular incisors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the issue with periodontal disease in planning support

A

If PDL has been partly destroyed by periodontal disease (periodontal disease often first attacks the widest part of the root and so its greatest area) the full support potential of the tooth cannot be used

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What fibres is vertical force generally transmitted by and what can impact the function of these fibres

A

oblique

will not function effectively if the teeth are tilted mesially (issue w/ mandibular molars)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

How does extent of saddle effect support

A

Smaller the saddle, lower the forces

22
Q

What do you look at when looking at expected force

A

Is the opposing dentition natural or artificial

Functional force created by an opposing denture is less than that of natural teeth

23
Q

What are rests made out of

A

cast or wrought metal

24
Q

Why can incorporating rest into acrylic resin be problematic

A

due to low base strength

placing a metal component potentially weakens the acrylic surrounding it

25
Q

What size of rest do we want

A

We want LARGE RESTS as these can direct the force down the LONG AXIS of the tooth

26
Q

What are the different type of rests

A

occlusal
cingulum
incisal

27
Q

What are occlusal rests used on

A

Premolars and molars

28
Q

What are cingulum rests used on

A

maxillary canines
mandibular canines (requires tooth prep)
maxillary central and lateral incisors

29
Q

What are the advantages of cingulum rests

A

Aesthetically superior to incisal rests

Apply stress at lower level due to less rotational forces

30
Q

What are incisal rests used for

A

mandibular canines

incisors

31
Q

What are the disadvantages of incisal rests

A

○ Not preferred due to aesthetics
○ May interfere with incisal occlusion
○ Not recommended on wear facets

32
Q

What are the functions of rests

A

assist in distribution of occlusal load
distribution of horizontal force
maintaining components in correct position
protecting the denture/abutment tooth junction
providing indirect retention
reciprocation
preventing overeruption
determine the axis of rotation for free end saddle RPD
direct retentive elements to work in a planned matter
providing bracing for anterior teeth

33
Q

How do rests distribute horizontal force

A

○ Some rests will transfer some of the horizontal functional force - this is known as the BRACING function

34
Q

How do rests maintain components of the denture in the correct position

A

The rests prevents the other components of the denture sinking into the soft tissues

35
Q

How do rests protect the denture/abutment tooth junction

A

○ Can provide a ‘roof’ to the space between the saddle and abutment tooth
○ Prevents food being forcibly pushed down by the denture into the GM

36
Q

How do rests provide reciprocation

A

○ Rest placed in a box shaped preparation in a molar or premolar tooth can provide effective reciprocation for a retentive clasp

37
Q

How do rests prevent over eruption

A

○ Tooth is best maintained in position by contact with an opposing natural or artificial tooth
○ In the absence of an opposing tooth, a well retained occlusal rest is able to prevent overeruption

38
Q

Describe rests as part of a metal framework base

A

All rests are integral to the base connected to the major connector directly or by minor connectors

39
Q

How are rests incorporated into PMMA

A

Rests are incorporated mechanically into (within) the base

40
Q

What is the issue with rests incorporated into PMMA

A

Any load resisted by rests through the denture base place an internal stress on the base material

41
Q

When is it ok to use rests in PMMA denture

A

They can be used when opposing forces are light e.g complete denture

42
Q

Where is the default position for a rest

A

for a bounded saddle is IMMEDIATELY adjacent to the saddle

the default position may have to be changed depending on the opposing dentition

43
Q

What is the default position for a free end saddle rest

A

NOT immediately adjacent to the saddle - it is placed on the MESIAL side of the abutment tooth

44
Q

Where should you avoid putting rests

A

Avoid placing a rest in an occlusal centric stop - will interfere with occlusion

45
Q

What is the possible consequences for preparing rest seats

A

Loss of occlusal stop when denture is not worn
Destruction of tooth surface
Exposure of dentine

46
Q

Where should mucosal support bases be placed in regards to the gingival margin

A

3mm

will place pressure at the GM otherwise

47
Q

What is a every partial denture design

A

for mucosal support
restores the dental arch; with contact points between the denture and abutment teet
connector borders kept 3mm away from GM

48
Q

In an every design denture what is used to prevent distal drift

A

a wire stop is placed posteriorly

49
Q

What is the issues with an every design denture

A

Some designs such as these can produce narrow and therefore weak denture base areas
Metal inserted into acrylic causes an inherent weakness in the denture base

50
Q

What is an issue with tooth and mucosal support denture

A

difference in compressibility between periodontium and mucoperiostium (0.1mm vs 2mm)
can cause denture to rock

BDS2 CLINICAL Prosthodontics (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions