Modification of Cavity Form for Different Materials Flashcards

1
Q

What is the state of collagen in caries infected dentine?

Is it reversible?

A
  • Denaturing of collagen

- Irreversible

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2
Q

What is the state of collagen in caries affected dentine?

Is it reversible?

A
  • No denaturing of collagen

- Reversible

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3
Q

When removing caries what do you need to do to when dealing with enamel? (3)

A
  • Gain access to caries
  • Remove unsupported prisms
  • Remove demineralised margins
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4
Q

When removing caries what do you need to do to when dealing with dentine? (3)

A
  • Identify caries infected dentine (CID)
  • Identify peripheral extent to EDJ
  • Excavate CID peripherally then towards pulp and in depth
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5
Q

In removing caries when may you need to carry out further carious dentine removal? (5)

what could preclude a seal? (2)

A
  • Poor quality peripheral enamel precluding seal
  • Inadequate moisture control at margin precluding seal
  • Symptoms of Pulpitis
  • High caries risk
  • Further structural support needed
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6
Q

What are some reasons for why we restore teeth?

A
  • To remove diseased tissue
  • To restore integrity of tooth structure
  • To restore function of tooth
  • To restore appearance of tooth
  • To prevent recurrence of caries (microleakage)
  • To provide durability and longevity
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7
Q

What are some factors that determine cavity design? (3)

A
  • Structure and properties of dental tissues
  • Extent and nature of dental disease
  • Properties of proposed Restorative Material
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8
Q

How do you macroscopically modify a cavity?

A

Using your bur (hand piece)

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9
Q

How do you microscopically modify a cavity?

A

Chemically with tissue conditioning

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10
Q

Explain the concept of retention in cavity placement

A

The property of a cavity that resists displacement of a restoration in the direction of its insertion

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11
Q

Explain the concept of resistance in cavity placement

A

The property of a cavity that prevents displacement of a restoration in apical or oblique directions (other directions)

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12
Q

What is the Cavo-surface angle?

A

Angle between the cavity that’s been cut in the tooth and the surface of the tooth

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13
Q

What macroscopic modification of the cavity is carried out for all restorations?

A

Rounding of internal line angles

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14
Q

Why do internal line angles of a cavity need to be rounded?

A

Reduces internal stresses and risk of crack propagation within restoration

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15
Q

What additional 4 macroscopic modifications may you need to carry out for amalgam cavities?

Why would you need to do this?

A
  • Cavity undercuts, grooves, slots, flat surfaces
  • Undercut give retention
  • Grooves/slots prevent displacement
  • Flat surface improves resistance
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16
Q

What is the ideal Cavo-surface angle for amalgams?

A

90 degrees

17
Q

What may occur if the Cavo-surface angle of a amalgam is greater than 90 degrees?

A

Amalgam near tooth surface may be too thin and crack

18
Q

What may occur if the Cavo-surface angle of a amalgam is less than 90 degrees?

A

Enamel surrounding cavity may be unsupported and weak and enamel may fracture

19
Q

What are some modification techniques that provide auxiliary retention? (5)

A
  • Slots
  • Grooves
  • Coves
  • Locks
  • Dentine pins
20
Q

What microscopic cavity modification do you need to perform for composites?

A

Enamel acid etch

21
Q

What microscopic cavity modification do you need to perform for GIC?

A

Dentine conditioner

22
Q

How does the enamel acid etch modification for composites benefit the tooth?

A
  • Removes smear layer

- Selectively demineralises prisms giving it micro-mechanical retention

23
Q

Why would you need to carry out an enamel margin bevel for composites? (3)

A
  • Removes unsupported enamel
  • Increases surface area
  • Aesthetics
24
Q

Explain GIC adhesion (3)

A
  • On mixing free polyalkenoic acid penetrates enamel/dentine
  • This displaces Ca2+ and PO4-
  • These combine with cement matrix to form ion-enriched layer between tooth and cement that is rich in F-