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5th ICP - Endo > Restoration RFT II > Flashcards

Restoration RFT II Flashcards

1
Q

Principles of crown retention?

A

Retain as much dentine as possible
Restore dentine mass w/ suitable material
Intra-radicular post if needed

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2
Q

When should intra-radicular post be considered?

A

When retention compromised

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3
Q

What can be used as core materials?

A

Amalgam
Composite
GIC

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4
Q

Issue w/ amalgam as core material?

A

No longer used as must be bonded due to unpredictable retention w/ tooth

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5
Q

Adv of composite as core material?

A

Adhesive

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6
Q

Purpose of intra-radicular post?

A

Retain and support core and coronal restoration

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7
Q

What are different types of posts?

A

Prefabricated or cast

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8
Q

Can use active thread system for posts?

A

No - introduce stress lead root splitting

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9
Q

What type of fit is ideal for post?

A

Passive - post is retained by adhesive lute

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10
Q

What consider about depth of post?

A

Deep post distribute stress better and are more retentive

BUT

disturb apical seal and destroy tooth substance

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11
Q

What ideal design of length of post?

A

Should be 3-4mm short apex
2/3 total root length
Greater 1/2 crown height

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12
Q

Adv and disadv narrow posts?

A

Narrow post are weak and easily rotated

but conserve tooth structure

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13
Q

What design feature should be used when prepping for post?

A

Dentine ferrule

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14
Q

What is a dentine ferrule?

A

Retentive feature of >1.5mm vertical sound tooth structure between crown margin and dentine-core interface wraps 360 around tooth

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15
Q

How create dentine ferrule?

A

Extend crown prep apical to post-dentine interface to create ferrule

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16
Q

How to prevent post rotating?

A

Most cases irregular shape access cavity will prevent rotation

17
Q

What shaped canals are ideal for prefabricated posts?

A

Circular root canals

Divergent roots

18
Q

When are cast posts indicated?

A

Non-circular canals

19
Q

What types of material are used for posts?

A

Resin-reinforced carbon-fibre
Ceramics
Composite
Metal alloys

20
Q

What can materials of post me

A

Rigid

Elastic

21
Q

What is the parapost system?

A

Integrated system of parallel posts

Matching instruments and posts

22
Q

Why can post-filled teeth fail?

A 
Bending of post
Rotation of post
Dislodgement of post 
Fracture of post
Fracture of root

5th ICP - Endo (7 decks)

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