Complete Overdenture Flashcards Preview

IODC - Dentures > Complete Overdenture > Flashcards

Flashcards in Complete Overdenture Deck (21)
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1
Q

What is the definition of a complete over denture?

A

An over denture is one which gains its support partly or wholly from the roots of retained, decoronated or crown modified teeth

2
Q

What are the 5 advantages of retaining roots?

A
  1. RR preserves the associated alveolar bone
  2. root face gives extra support
  3. extra retention via attachment
  4. Psychological benefit
  5. Retained proprioception from PDL and tactile discrimination
3
Q

How is preserving alveolar bone advantageous?

A

Enhance stability

Prevent resorption

4
Q

How does retaining root face help with support?

A

Tissue support greater occlusal loads and protect soft tissue against mechanical trauma
Denture sit on non compressible tissue

5
Q

How can attachments provide extra support?

A

CEKA and magnetic attachment provide +ve retention

Will need maintenance / repair

6
Q

How can retained roots provide psychological benefit?

A

Knowing have remaining teeth

Lost teeth associated social inequality

7
Q

How can retaining roots be good for systemic health?

A

Pt on bisphosphonates

Balance between risk and disease

8
Q

What are the 5 disadvantages of retaining roots?

A
  1. Expensive
  2. Failure can occur
  3. Balance issues
  4. Time intensive
  5. Maintenance
9
Q

Why is retaining roots expensive?

A

Carrying out RCT

May need denture reinforcement

10
Q

Why can failure occur in retained roots?

A

Caries

At placement - roots hidden - cariogenic process can be accelerated

11
Q

Why can balance be an issue with retained roots?

A

If single/ poorly matched roots on either side = problem with balance

12
Q

Why can retained roots make process take longer?

A

Need prep work (RCT), aftercare (caries prophylaxis) and more prolonged tx

13
Q

Why is maintenance an issue w/ retained roots?

A

More risk of disease

14
Q

4 cases where over dentures specially indicated?

A
  1. Thought alveolar bone resorption will be significant
  2. Repeated alterations to dentures might be undesirable and extraction contraindicated
  3. Increase in face height is needed in case of tooth wear/ hypodontia
  4. Thought adaptation might be poor/ extra retention is desirable
15
Q

When may alveolar bone resorption be significant?

A

Unopposed mandibular anterior teeth - predispose maxillary atrophy

16
Q

What factors must you consider when selecting teeth?

A

Simply root canal shape - endo
Adequate tooth size (e.g canine)
Sufficient support
Bone - no buccal undercut

17
Q

What would the ideal tooth arrangement be?

A

Bilateral tripod of support
Opposed if possible
Not in close contact - proximity

18
Q

What are the 3 types of over denture?

A
  1. Immediate (type I or type II)
  2. Transitional - by addition to partial
  3. Permanent
19
Q

Difference between immediate type I and type II?

A

Type I - XLA needed

Type II - non-extraction (preserve teeth - may need to be RCT/ decoronated)

20
Q

Why are transitional dentures useful?

A

Assess tolerance, caries rate and outcome

21
Q

What are associated problems with permanent over dentures?

A
  1. Endo- over dentures of RF filled teeth more successful
  2. Functional contact
  3. Abutment form
  4. Additional retention
  5. Aftercare