Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

4 - misc > posts > Flashcards

posts Flashcards

1
Q

What are the tx objectives when restoring an endodontically treated tooth?

A

Retain tooth as functional unit in arch
Maintain coronal seal
Protect and preserve the remaining tooth structure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What should be considered when planning a final restoration?

A

Amount of supra-gingival remaining tooth structure
Position of tooth in the arch
Opposing dentition
Length, width and curvatures of root

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the consequences of endo treating a tooth?

A

Proprioception reduced by 30%
Not more likely to fracture
Not more brittle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the aim of a post?

A

To retain a core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When is a post required?

A

If loss of 3 walls or no walls remaining

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is ferrule and how large should it be for a post?

A

The remaining circumference of dentine extending coronal of the preparation
2-3mm ideally but no less than 1.5mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Why is a ferrule important?

A

Resists stresses which otherwise cause root fracture:
- functional lever forces
- lateral forces during post insertion
- wedging effect of tapered posts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the optimal post dimensions?

A

As long as possible while still leaving 3-5mm of GP apically
No more than 1/3 the root diameter
Placed in the straightest part of the canal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the different fabrication post types?

A

Prefabricated
Custom made - direct or indirect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the different post materials?

A

Metallic - SS, Ti and cast metal
Non metallic - glass fibre, ceramic fibre

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the different post shapes?

A

Parallel
Tapered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the different post surface?

A

Serrated
Smooth
Threaded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the advantages of cast metal posts?

A

Used in flared canals
Follows canal shape as custom made
Conserves tooth tissue which reduces risk of perforation compared to parallel fibre posts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the disadvantages of cast metal posts?

A

Direct/indirect techniques:
- impression required
- lab and extra clinical stages
- more room for error

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the advantages of fibre posts?

A

Tooth coloured - enhanced aesthetics
Compatible with current adhesive systems
Low elastic modulus - similar to dentine - posts absorb and dissipate stress rather than transfer to tooth
Can be placed immediately

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the disadvantages of fibre posts?

A

Difficult to remove upon retreatment
Less conservative of tooth tissue than cast metal posts

17
Q

When should fibre posts be avoided?

A

If there is less than 2-3mm of supragingival tooth structure present
If there is parafunction
If there is a deep overbite

18
Q

What is the method of failure of cast metal posts?

A

Will fracture the root

19
Q

What is the method of failure of fibre posts?

A

Will deboned at post-cement interface leading to recurrent caries

20
Q

What are the advantages of tapered posts?

A

Follows root form ensuring maximal retaining root dentine apically
Stress concentration coronally

21
Q

What are the disadvantages of tapered posts?

A

Wedging effect
Retained by cement

22
Q

What are the advantages of parallel posts?

A

Uniform stress distributing along length
Increased pull-out strength

23
Q

What are the disadvantages of parallel posts?

A

More tooth structure removed
Stress concentration apically

24
Q

What is the advantage and disadvantage of self-threading posts?

A

Increased retention from self-threading into the dentine
This sets up fracture lines

25
Q

What is the optimal post design?

A

Non-threaded
Parallel sided - avoid wedging forces
Cement retained - cement distributes masticatory forces evenly

26
Q

What are the types of post cements?

A

Adhesive resin cement
GIC
RMGIC

27
Q

What is the function of a post and core?

A

Provides support and retention of the restoration

4 - misc (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions