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Dental Materials & Operative Techniques > Cavity Liners > Flashcards

Cavity Liners Flashcards

1
Q

What are the disadvantages of restorations?

A
  1. May not make intimate contact with tooth surface (esp dentine)
  2. Exothermic reactions
  3. Chemicals released
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2
Q

What is the purpose for a cavity liner?

A
  1. Prevents microleakage
  2. Acts as protective barrier (chemical, thermal, bacterial)
  3. Therapeutic (calms inflammation)
  4. Palliative (calms symptoms until definitive tx)
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3
Q

What cavity liners/ bases are there?

A
  • Setting CaOH = liner
  • Zinc oxide based cements = base
  • GI/ RMGIC = base or liner
  • Palliative cements = base (seldom used)
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4
Q

What type of reaction is sCaOH?

A

Acid-base chelation

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5
Q

What is the mode of action of sCaOH?

A
  • Bactericidal (pH12 kills acidic bac)

- Irritation –> releases Ca from pulp –> stimulates odontoblasts –> tertiary dentine formation

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6
Q

What are the advantages of sCaOH?

A
  • Quick setting time
  • Radiopaque
  • Easy to use
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7
Q

What are the disadvantages of sCaOH?

A
  • Low compressive strength
  • Soluble –> unstable
  • Does not bond to dentine
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8
Q

What types of zinc oxide based cements are there?

A
  1. Zinc phosphate
  2. Zinc polycarboxylate
  3. ZOE
  4. RMZOE
  5. EBA/ZOE
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9
Q

What are the clinical indications for ZOE?

A
  • Lining/ base in deep cavities (Am only, discolours comp)
  • Root canal sealer
  • Periodontal dressing
  • Temporary restorations (RM or EBA ZOE)
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10
Q

What type of reaction is ZOE?

A

Acid-base chelation

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11
Q

What are the advantages of ZOE?

A
  • Good working time
  • Good setting time
  • Low thermal conductivity
  • Radiopaque
  • Soluble –> released eugenol reduces pulp pain
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12
Q

What are the disadvantages of ZOE?

A
  • Weak
  • High solubility
  • Inhibits set of resin-based materials (softens and discolours)
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13
Q

What is the advantage of using EBA ZOE?

A
  • Stronger than ZOE or RMZOE

- Less soluble

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14
Q

What is the advantages of GIC?

A
  • Bonds and seals dentine
  • F release
  • Easy to use
  • Low thermal conductivity
  • Strong
  • Radiopaque
  • Low solubility
  • Can bond to restorative materials
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15
Q

What are the disadvantages of RMGIC?

A

Requires curing, any unreacted HEMA may damage pulp

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16
Q

What lining material is recommended for cavities in dentine?

A

RMGIC (Vitrebond)

17
Q

When is it recommended to use sCaOH?

A

Cavities close to pulp

Direct/ indirect pulp cap

Dental Materials & Operative Techniques (13 decks)

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