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5th yr- Finals- CSA revision > The failure of directly-placed restorations > Flashcards

The failure of directly-placed restorations Flashcards

1
Q

Why do we restore teeth

A
  1. To stop the progression of caries and prevent its recurrence
  2. Restore occlusion and function
  3. Restore aesthetics
  4. Maintain physiological integrity of the teeth with the adjacent hard and soft tissues
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2
Q

What is the median survival rate for amalgam?

A

15-22.5 years

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3
Q

What is the annual failure rate for amalgam?

A

3%

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4
Q

Why might amalgam fail

A
  1. Incorrect case selection
  2. Cavity preparation has inadequate retention
  3. Poor matrix preparation
  4. Contamination
  5. Failure to condense
  6. Improper finishing and polishing procedures
  7. Micro leakage ditching and creep
  8. Tarnish and corrosion
  9. Faulty contacts
  10. not manipulating amalgam properly
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5
Q

What is failure rate of composite resin materials after 10 years?

A

50% failure

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6
Q

What is the medical survival of composite?

A

8 years

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7
Q

Why might composite fail

A
  1. Incorrect case selection
  2. Difficulty to obtain long term adhesion between the composite resin and the dentine
  3. Contamination of the material (moisture control)
  4. Polymerisation shrinkage causing caries, sensitivity, marginal deficiency
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8
Q

What is the median survival of glass ionomer

A

30-42 months in permeant teeth

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9
Q

Why might glass ionomers fail

A
  1. Case selection
  2. Poor handling of the material at the time of placement
  3. Excessive occlusal loads
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10
Q

Name the broad factors that affect the success and failure of restorations

A
  1. patient factors
  2. Operative factors
  3. Material factors
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11
Q

What patient factors can lead to restorative failure

A
  1. Caries risk
  2. Heavy occlusal forces
  3. Tooth to be restored
  4. Cavity size and location
  5. Plural health
  6. Periodontal health
  7. Allergies
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12
Q

What operate factors can lead to restorative failure

A
  1. Incorrect choice of restorative dental materials for the situation
  2. Incorrect cavity design
  3. If you dont handle the material in the most effective way
  4. The use of exemplary clinical techniques in placement and finishing
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13
Q

How can cavity design decease the effectiveness of a restoration?

A
  1. No retention factors
  2. If you don’t remove unsupported enamel
  3. Weakened cusps
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14
Q

How can a restoration failure affect the patient and dentist

A
  1. Require time
  2. Requires money
  3. Uses materials
  4. Affects remaining tooth structure
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15
Q

What material factors can lead to restorative failure

A
  1. Compressive strength
  2. Adhesion property
  3. Resistance to fatigue
  4. Solubility
  5. Ditching and creeping
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16
Q

What are ditching and creeping a result of

A

A result of the slow deformation of amalgam placed under constant load

17
Q

When can ditching and creeping mostly be seen

A

When using amalgam with the gamma 2 phase products

18
Q

What is ditching and creeping

A

Breakage of a thin edge creating an irregular v shaped crevice

19
Q

When does creep occur

A

When the corrosive products leak and fill the space between the tooth and the restoration

20
Q

Which filling material would you recommend to a patient with a high caries risk

A

Amalgam

21
Q

Give some disease that can cause restorations

A
  1. Caries
  2. Tooth wear
  3. Periodontal disease
  4. Pulpal problems
  5. Trauma
22
Q

What technical failures can arise which may cause the restoration to fail

A
  1. Fractured restorations
  2. Marginal breakdown
  3. Tooth fracture
  4. Defective contours
  5. Failure of retention
23
Q

How do you detect restoration failure

A
  1. Patient symptoms
  2. Visual and tactile inspection
  3. Transilliumintion
  4. Radiographic examination
  5. Occlusal examination
24
Q

What complains might a patient come in if their restoration fails

A
  1. Pain
  2. Aesthetic concerns
  3. Discolouration
  4. Fracture
25
Q

What is the treatment for oral lichenoid to amalgam?

A

Replace the amalgam restoration with an amalgam and check if the allergy has vanished

26
Q

How do we confirm if a patient has had a lichenoid reaction to amalgam

A

Replace the amalgam restoration with an amalgam and check if the reaction has varnished

27
Q

How can we visually check if a patent has a failed reaction?

A

1, Caries
2. marginal breakdown
3 .lost restoration
4. fractured restoration
5. excessive discoloration
6. open contacts and overhangs

28
Q

What is the main reason a restoration os any Material is replaced

A

Secondary caries

29
Q

What is primary caries

A

Caries formed at a new site of the tooth

30
Q

What is secondary caries

A

Caries found at the margin or under a restoration

31
Q

What is another name for secondary caries

A

Recurrent caries

32
Q

In which material is a risk of secondary caries higher and by how much

A

3.5 Times greater for composite than amalgam

33
Q

What can cause a change in colour of a restoration?

A

Due to:
1. Loss of marginal integrity
2. Micro leakage of composite resin restoration
3. Marginal staining
4. Loss of surface lustre and polish

5th yr- Finals- CSA revision (19 decks)

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