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5th - APD > Interim Restorations > Flashcards

Interim Restorations Flashcards

1
Q

Aim endo?

A

Eliminate bacteria from the tooth - needs to be maintained to prevent further ingress

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2
Q

What is an interim restoration?

A

Restoration placed after pathology removed at commencement of endoodntic treatment

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3
Q

When interim restoration used?

A

Remain in place while endo being carried out and until definitive restoration placed

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4
Q

What is a temporary restoration?

A

Placed in cavity -likely to have been cut via interim restoration

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5
Q

8 steps successful Edno?

A 
Dx and remove cause disease
Aseptic technique
Correct instrumentation cnaals
Irrigate canals w/ antibacterial
Medicate canals
Restore tooth prevent ingress bacteria
Fill system once disinfected 
Restore to normal function
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6
Q

Most common pathway for bacterial ingress?

A

Caries, cracks, exposed dentine, degraded restoration margins

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7
Q

What type of restoration should never be accessed via for endo?

A

Failing/ poor quality/ temporary restoration

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8
Q

Why not access via temporary restoration?

A

Bits fall off = lose reference point

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9
Q

What should good interim restoration provide?

A 
Structural integrity 
Coronal seal
Allow ideal access cavity cut
No risk leakage 
Allows rubber dam to be placed 
Allows temporary restoration to be placed
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10
Q

What are appropriate materials for interim restoration?

A

Composite
RMGIC
Amalgam

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11
Q

When should metal bands be used?

A

Large restorations

Teeth w/ cracks

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12
Q

Adv of metal bands

A

Supports weakened structure

Prevent progression of cracks

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13
Q

How use metal bands?

A

Ensure correct size
Lute band - RMGIC/GIC
Good margin allow OHI

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14
Q

Why should crowns be removed prior endo?

A

Assess underlying structure
Identify pathology
Better orientation
Better coronal seal w/o

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15
Q

How remove crown?

A

Take putty index - can make temporary
Make groove and twist w/ instrument
If unsuccessful continue groove occlusal, then lingual

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16
Q

What to provide after endo when removed crown?

A

Provide provisional temporary
Consider using zinc phosphate > temp bond
Consider seal tubules w/ dentine bonding agent

17
Q

Requirements of temporary restoration?

A

Occupy access cavity - provide effective and durable coronal seal

18
Q

Desirable property of temporary restoration?

A

Ease removal
Difference tooth tissue and restoration
Inexpensive

19
Q

Examples of temporary materials can be used in access cavity?

A 
Zinc-oxide based - IRM
GIC
RMGIC 
Composite
Zinc oxide/ calcium sulphate - Cavit
20
Q

What depth should temp restoration be?

A

3mm - provide adequate seal

21
Q

Why should cotton wool not be used?

A

Wick saliva and bacteria through and under restoration

Use foam pellets

22
Q

Issue cavit/ coltisol?

A

Soft material used for double seal

Provide excellent seal but harder remove

23
Q

How restore tooth following completion endo?

A

Cut GP to ADJ
Place GIC access - leave 3mm coronally
Restore coronal w/ amalgam/composite

24
Q

Why do posterior teeth require protection when undertaking endo?

A

Reduced tooth structure/ loss marginal ridge = access cavity

Axial force - flex cusps / fracture cusps

25
Q

When is a tooth most vulnerable?

A

Access + loss both marginal ridge w/ buccal/palatal restoration

26
Q

How protect posterior tooth in interim?

A

Occlusal adjustment to reduce loading
Cusp reduction w/ overlay
Cement ortho bend
Interim crown - metal/composite

27
Q

How to protect posterior tooth following endo?

A

Cusp reduction and overlay
Onlay
Full crown

28
Q

How to provide occlusal adjustment?

A

Articulation paper - mark ICP contact
Different colour - mark lateral excursion
Adjust - remove lateral contacts and keep ICP contacts

29
Q

How to provide cusp reduction?

A

Reduce 2-3mm
Build w/ composite/amalgam
Restore ICP contact

30
Q

Adv onlay?

A

Strong, indirect option while conserving tissue compared full crown

31
Q

Adv full crown?

A

Provide full coverage and hence better seal - at expense tooth reduction

32
Q

Issue crown of endo teeth?

A

Thin dentine walls remain - due access and full coverage prep

33
Q

Difference of root treated teeth w/ and w/o indirect restoration?

A

Teeth w/o indirect 6x more likely to fail

5th - APD (8 decks)

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