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Operative Techniques > Principles of Cavity Preparation > Flashcards

Principles of Cavity Preparation Flashcards

1
Q

What determines cavity design? (3)

A
  1. Structure + properties of the dental tissues
  2. The diseases (dental caries, per disease, tooth surface loss)
  3. Properties of restorative materials
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2
Q

What steps does the final restorative design rely on? (4)

A
  1. The position of the caries
  2. The extent of the caries
  3. The shape of the prepared cavity
  4. The final restorative material
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3
Q

What areas can caries be found? ( 4)

A
  1. Pits and fissures
  2. Approximal:
    - Posterior
    - Anterior
  3. Smooth surface
  4. Root
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4
Q

When should a clinician intervene with a lesion? (2)

A
  1. When the lesion is cavitated

2. When the patient can’t access the lesion for prevention

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5
Q

When should a clinician CONSIDER a restoration? (3)

A
  1. The lesion is into dentine radiographically
  2. The lesion is causing a pulpitis
  3. The lesion is unaesthetic
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6
Q

What is the exception for when healthy tooth tissue CAN be removed? (3)

A
  1. The material used for the restoration requires it
  2. The margins of the cavity are in contact with another tooth surface
  3. The margins of the cavity cross an occlusal contact
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7
Q

State the principles of cavity prep (6)

A
  1. Identify + remove carious enamel
  2. Remove enamel to identify extent of lesion at ADJ + smooth the enamel margins
  3. Remove peripheral caries in dentine from ADJ first, then circumferentially deeper
  4. Only THEN remove deep caries over the pulp
  5. Outline form modification
    - Enamel finishing
    - Occlusion
    - Requirements of the restorative material
  6. Internal design modification
    - Internal line + point angles
    - Requirements of the restorative material
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8
Q

Checklist for when checking the final cavity design (5)

A
  1. Where an existing restoration has been removed, ensure that no traces of restorative material remain
  2. Smooth enamel line and point angles
  3. Create appropriate Cavo-surface margin angle
  4. Remove dentinal sharp line or point angles
  5. Check for stress concentrators
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9
Q

What should the final seal of the restoration contain? (5)

A
  1. Smooth margins
  2. Appropriate CSMA
  3. No unsupported tooth tissue
  4. No stress concentrators
  5. Internal anatomy that allows adaption of the material
  6. Smooth line and point angles
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10
Q

How is dentinal caries detected?

A

Detected as a brown stain
OR
Softened tissue when using a sharp probe

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11
Q

Compare sound dentine and residual carious dentine

A

Sound dentine shouldn’t yield under probing

Any sticking of the probe indicates residual caries that should be removed

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12
Q

How is caries on the pulpal floor removed?

A

Using a large bound bur or large hand held excavator

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13
Q

Advantages of composite (6)

A
  1. Aesthetics
  2. Conservation of tooth tissue
  3. Support for remaining tooth tissue
  4. Adhesion/bonding
  5. Low thermal conductivity
  6. Elimination of galvanism
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14
Q

Define the term galvanism

A

Electric currents between metal in dental restorations and electrolytes in saliva/dental pulp/ other restorations

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15
Q

Disadvantages of amalgam (4)

A
  1. Aesthetics
  2. Does not bond to enamel or dentine
  3. Does not support the tooth
  4. Need to remove healthy tissue to get retention + resistance
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16
Q

What holds amalgam into the cavity?

A

Retention + resistance form

17
Q

What prevents amalgam from fracturing?

A

Adequate bulk - at least 2mm deep

18
Q

What is retention, in terms of amalgam cavity design?

A
  • Features of the cavity which prevent the restoration being dislodged in any occlusal direction
  • Achieved by anatomical cavity design features
    e. g. undercuts, dovetails, key, isthmus

NOT REQUIRED FOR ADHESIVE RESTORATIONS

19
Q

Why are CSA adjusted?

A

To increase bonding area and ensure no unsupported enamel

REQUIRED FOR ADHESIVE RESTORATIONS

20
Q

How should the internal dimensions of a amalgam cavity differ from a composite cavity?

A

Internal dimensions of the cavity should be greater than the access into it

21
Q

What is the usual CSA angle for amalgam?

A

Between 90-120 degrees

22
Q

Why should caries NOT be left at the dentine-enamel junction?

A

It will result in unsupported enamel and early breakdown of the restorative margin IF micro leakage occurs

23
Q

Why should the configuration factor be low?

A

Reduced polymerisation contraction stresses

Configuration stress leads to enamel failure

24
Q

How should a cavity be cleaned up after cavity prep?

A

Remove loose enamel + dentine chipping and organic/inorganic dentine debris smeared into the walls of the cavity

BY

Washing the cavity with air + water
Rinse with water and leave surface moist

25
Q

What can smooth surface caries be a result of? (5)

A
  1. Caries
  2. Erosion
  3. Abrasion
  4. Abfraction
  5. Hypoplasia
26
Q

The type of tubules in primary dentine

A

Open tubules

Operative Techniques (6 decks)

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