Brainscape's Knowledge GenomeTM

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


See full index

Revision big doc > Partial dentures > Flashcards

Partial dentures Flashcards

1
Q

What are 6 causes of tooth loss?

A
  1. Caries
  2. Periodontal disease
  3. Trauma
  4. Planned orthodontic extractions
  5. Unerupted or impacted teeth
  6. Congenital conditions (hypodontia)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are 4 consequences of tooth loss? (broad categories)

A
  1. Anatomical: reduced lip support and bone loss, tooth movement, occlusal instability and TMJ disorders.
  2. Aesthetics

3: Function: Mastication dependant on dental status and number of occluding units

  1. Psychological: depression, anxiety, social deprivation and loss of confidence as well as profound changes in diet and food choice.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the options to replace missing teeth?

A
  • Do nothing
  • Bridges: RRB and conventional
  • Dentures
  • Implants
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are advantages of removable dentures?

A
  • RPDs are the simplest, cheapest and by far the most common method of replacing missing teeth
  • Variation depends on public and professional attitude to partial denture use and health care systems
  • Non-invasive
  • Reversible
  • Adapted and modified if further tooth loss
  • Restore long spans, last for an extended period
  • Alveolar bone loss and soft tissue loss also restored
  • Less extensive than implants or bridges
  • Atraumatic and conservative
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are disadvantages of removable dentures?

A

Psychological

Removable

Less acceptable

Damaging effects, such as inflammation of gingival tissues and mucous membrane.

Poor oral hygiene

Altered taste and temperature sensation

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

What are design principles for RPDs?

A
  • Hygienic - minimal gingival coverage of gingival tissues.
    -> Try and deep at least 3mm away from gingival margins.
    -> Create space for natural cleaning and Oh measures
  • Full extensions on mucosal supported saddles
  • Simple design
  • Avoid unnecessary gingival coverage
  • use tooth support where possible
  • Wide extension of mucosal supported saddles
  • Use rigid connectors, rests and bracing components.
  • Bilateral even occlusal contacts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What can be incorporated in to indirect restorations that can aid in denture design?

A

Rest seats

Undercuts

Guide planes

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

In what order do you design a denture?

A
  1. Saddles (teeth to be replaced)
  2. Support
  3. Retention
  4. Reciprocation
  5. Indirect retention
  6. Major and minor connectors
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Do you replace the 7s?

A

Not necessarily
Yes if have opposing 7?
No if not

Only mandible, lower 7 extension, the tongue can overly and help hold down the denture.

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

What is support?

A

Resistance to vertical forces of occlusion.
- Factors of the bearing surface that resist of absorb occlusal loads during function.

a. Resistance of movement towards the mucosa
b. Reduces trauma to tissues
c. Improves distribution of loading
d. Reduces movement of denture on loading.

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

What can act as
a. tooth support (3)
b. mucosal support (3)

A

a. cingulum rest, occlusal rest, incisal rest

b. maximum extension possible to distribute load, to include the hamular notch, tuberosities and retromolar pad.

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

What is retention?

A

Resistance to vertical displacement of the denture away from denture bearing surface during function.

It is resistance away from the tissues, achieved by mechanical means such as clasps and precision attachments. Also involved with the path of insertion, this insertion helps to form retention.

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

What is stability?

A

Resistance to lateral displacement of the denture during function

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

What is Kennedy Class I?

A

Bilateral free end saddle

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

What is Kennedy class II?

A

Unilateral free end saddle

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

What is Kennedy class III?

A

Bounded saddle

17
Q

What is Kennedy class IV?

A

Anterior bounded saddle that crosses the midline

18
Q

What are features of a Kennedy Class I denture?

A
  • Tooth and mucosa borne denture.
  • Needs optimal coverage of tissues in saddle area
  • Tooth support is possible, to prevent ‘gum stripping’
  • Indirect retention to minimise rotation.
19
Q

What are features of a Kennedy Class II dentures?

A

Features and problems same as Class I and Class III

Can be difficult with maximum denture base extension of free end saddle

Correct direct retention

20
Q

What are features of Kennedy Class III?

A

Tooth supported and mucosal support only on long spans or if issue with perio support

Needs direct retention

21
Q

What are advantages of mucosa borne dentures?

A

Cheap
Can easily be added to and modified
Preparation for complete dentures
If periodontal disease is present
In young children

22
Q

What are advantages of tooth borne dentures?

A
  • Forces are directed through the periodontal ligament.
  • If designed correctly, no damage to denture foundation
  • Well tolerated
23
Q

What can excessive loading forces on a denture do?

A

Can cause bone resorption and mobility of teeth

24
Q

When planning support for a denture, what do you look at?

A

Root area of abutment teeth, using clasps and rests

Saddle extension

Force expected on saddles

25
Q

What do dental surveyors do?

A

Determine the path of insertion of a partial denture.

  • Use to minimise undercuts and black triangles.
  • Identifies undercut and non-undercut areas via production of survey line.
  • Path of insertion needs to be different to path of displacement
  • Rigid denture parts must be designed to lie outside the undercut area
  • Terminal 1/3rd of retentive clasp is flexible (engages in undercut to aid retention)
  • Dentures move away from supporting tissues during function = need retention.
26
Q

What factors influence the path of insertion?

A
  • Retention
  • Guide surface
  • Aesthetics
  • Dead space interferences
27
Q

What is the role of guide surfaces?

A

Series of parallel surfaces, parallel to each other and the path of insertion.

It ensures that dentures can be inserted and withdrawn along the selected path of insertion.

Frictional contact may assist overall retention (cut guide planes)

Reduces dead space, tight fit of denture in-between the guide surfaces.

28
Q

What path of insertion should avoid: (3)

A
  1. interferences
  2. compromised appearance
  3. poor distribution of retentive undercuts
29
Q
A

Revision big doc (8 decks)

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