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BDS4 CDS Restorative, Pros & Endo > Endo/Rest: Restoration of Endodontically Treated Tooth > Flashcards

Endo/Rest: Restoration of Endodontically Treated Tooth Flashcards

1
Q

What is the biggest cause of RCT failure ?

A

Coronal micro leakage caused by poor coronal seal.

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2
Q

Your patient has an root treated anterior tooth with intact marginal ridges - what are the treatment options for restoring this tooth ?

A

Composite restoration or veneer.

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3
Q

Your patient has an root treated anterior tooth with intact marginal ridges but is discoloured - what are the treatment options for restoring this tooth ?

A

Bleaching or veneer or crown.

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4
Q

Your patient has a root treated anterior tooth with loss of the marginal ridge - what are the treatment options for restoring this tooth ?

A

Core build up with crown or post-crown.

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5
Q

What are the functions of a post-core ?

A

Gains intra-radicular support for a definitive restoration.
Core provides retention for crown.

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6
Q

What are the guidelines for placing a post with regard to tooth type/selection ?

A

Incisors and canines - unnecessary if sufficient coronal dentine.
Contraindicated in mandibular incisors.
Avoid in dilacerated canals.

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7
Q

Guidelines for post placement - how much root filling should be left after post placement ?

A

4-5mm.

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8
Q

RESTORATION OF ENDODONTICALLY TREATED TOOTH

Guidelines for post placement - how wide should your post be ?

A

No more than 1/3 root width at narrowest point and 1mm of circumferential coronal dentine remaining.

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9
Q

Guidelines for post placement - what is the post length/crown ratio ?

A

1:1

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10
Q

Guidelines for post placement - what is the minimum ferrule required for post-placement ?

A

1.5mm

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11
Q

Define ferrule.

A

Dentine collar - encirclement of 1-2mm of vertical axial tooth structure within the walls of a crown.

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12
Q

What is the importance of a ferrule ?

A

Prevents tooth/root fracture.

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13
Q

What are the characteristics of the ideal post ? And why ?

A

Parallel sided - avoids wedging and more retentive.
Non-threaded - incorporates less stress.
Cement retained - acts as buffer between masticatory forces and post-tooth.

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14
Q

MANUFACTURE - what are the benefits of a pre-fabricated post ?

A

1 visit required for post prep and placement.

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15
Q

MANUFACTURE - what are the benefits of a custom post ?

A

Unified post and core - made of one piece of same material.

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16
Q

MANUFACTURE - what is the disadvantages of a custom post ?

A

2 appointments required.
Temporisation between visits.
Risk of contamination.

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17
Q

MATERIAL - what metals are used in fabrication of post ?

A

Cast gold, stainless steel, brass, titanium.

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18
Q

MATERIAL - what are the disadvantages of using metal post ?

A

Poor aesthetics, risk of root fracture, corrosion, sensitivity.

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19
Q

MATERIAL - what is the benefits of using metal post ?

A

Radiopaque.

20
Q

RESTORATION OF ENDODONTICALLY TREATED TOOTH

MATERIAL - what two ceramics can be used in fabrication of post ?

A

Zirconia or alumina.

21
Q

MATERIAL - what are the benefits of using ceramic post ?

A

High flexural strength, fracture toughness, favourable aesthetics.

22
Q

MATERIAL - what are the disadvantages of using ceramic posts ?

A

Difficult retrievability and root fracture common.

23
Q

MATERIAL - what are the benefits of fibre post ?

A

Flexible, dentine properties, aesthetic, retrievable, bonds to dentine via DBA, radiolucent.

24
Q

MATERIAL - what is the disadvantage of fibre posts ?

A

Need substantial tooth tissue remaining.

25
Q

Tapered vs. parallel posts ?

A

Tapered are less retentive vs. parallel.
Parallel posts are less conservative.

26
Q

What three materials can be used for core build up ?

A

Composite, amalgam, GI.

27
Q

What is the benefits of using composite for core build up ?

A

Good aesthetics, bonds to tooth structure, command set.

28
Q

What is the disadvantages of using composite for core build up ?

A

Moisture control.

29
Q

RESTORATION OF ENDODONTICALLY TREATED TOOTH

What type of post requires composite core build up i.e. indications for using composite as core material ?

A

Fibre post.

30
Q

What is the problems which using amalgam as core build up material ?

A

Poor aesthetics, cannot be prepared straight away, requires 24 hours to set, less retentive.

31
Q

What is the problems with using GIC are core build up material ?

A

Absorbs water and core expands in size - risk of crown not fitting.

32
Q

What is a Nayyar core ?

A

Amalgam packed into coronal part of root canals and tooth built-up. Provides retention for amalgam.

33
Q

What is the gold standard restoration of posterior endodontically treated tooth ?

A

Onlay cusps coverage restoration coverage for all cusps - reduces risk of cusps fracture.

Other options - porcelain, gold, MCC crown, amalgam, restoration.

34
Q

What are the two key core design features ?

A

6 degree taper and 2mm clearance for MCC.

35
Q

There is sufficient coronal structure present - how is rotation prevented ?

A

Vertical coronal wall.

36
Q

RESTORATION OF ENDODONTICALLY TREATED TOOTH

There is absence of coronal dentine - how is rotation prevented ?

A

Vertical groove in canal acts as anti-rotational element.

37
Q

What are the risks related to posts ?

A

Perforation, core fracture, root fracture, post fracture, repeated debonding.

38
Q

What are the treatment options for a post perforation ?

A

Internal or external repair (periradicular surgery might be indicated).
Extraction.

39
Q

What is the prognosis for a root treated tooth ?

A

7-10 years.

40
Q

How can root fractures be diagnosed ?

A

Periodontal exam looking for extended pockets.
Bite tests using frac finders.
Transillumination.
Test cavities.
Selective anaesthesia.
Radiographs.

41
Q

Why should an endodontically treated tooth have a cusp coverage restoration ?

A

For good coronal seal and prevention of fracture.

42
Q

What luting agent is used to cement fibre post ?

A

RelyX - self adhesive universal resin cement.

43
Q

What luting agent is used to cement custom metal post ?

A

Aquacem.

44
Q

What are the two brand names of composites used for core build ups ?

A

SDR and Paracore.

45
Q
A

BDS4 CDS Restorative, Pros & Endo (13 decks)

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