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Endodontics BDS3 > Restoration of the Endodontically Restored Tooth > Flashcards

Restoration of the Endodontically Restored Tooth Flashcards

1
Q

what do you assess for on the endodontically restored tooth

A

coronal seal
amount of remaining tooth structure
is tooth restorable
swelling
sinus
TTP
buccal sulcus - tender?
mobility
increased pocketing

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2
Q

what do you look for on a radiograph

A

root filling
unfilled/missed root canals
shape of canal
patency
bone support
crown to root ratio
pathology

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3
Q

what are the problems faced after RCT

A

amount of remaining tooth structure
restoration type
lack or no ferrule
wide post holes
endo complications - fractured instruments

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4
Q

are teeth brittle after endodontic treatment

A

no

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5
Q

are root treated teeth more prone to fracture

A

no

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6
Q

is dentine hardness affected after RCT

A

no

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7
Q

does dehydration affect the hardness of a RCT tooth

A

no

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8
Q

what is coronal microleakage

A

ingress of microorganisms into root canal system

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9
Q

what can coronal microleakage cause

A

failure of RCT

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10
Q

how do you create a good coronal seal

A

trim GP to the ACJ and place RMGI over pulp floor and root canal openings

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11
Q

what restorations could you give for an anterior tooth with intact marginal ridges

A

composite
veneer

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12
Q

what restoration could you give for anterior teeth with intact marginal ridges and discoloured crown

A

bleaching or veneer
crown

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13
Q

what restoration could you give for anterior tooth with marginal ridges destroyed

A

core build up for crown
post crown

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14
Q

what is required for a direct post

A

ferrule

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15
Q

what does a post/core do

A

gain intraradicular support for definitive restoration
provide retention for crown
retains the core

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16
Q

what are the components of a post and core

A

post placed in root canal
core is supragingival and is what the prosthesis is cemented to

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17
Q

when do you avoid placing a post/core

A

if sufficient coronal dentine present
mandibular incisors (thin roots)
curved canals (avoid perforations)

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18
Q

how long should the root filling length be

A

4-5mm apically

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19
Q

how wide should the post be

A

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

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20
Q

what should the minimum post length to crown ratio be

A

1:1

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21
Q

how much ferrule do you need for a post/core

A

1.5mm height and width

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22
Q

what is a ferrule

A

dentine collar - encirclement of 1-2mm of vertical axial tooth structure within walls of a crown

23
Q

what does a ferrule prevent

A

tooth fracture

24
Q

when is root fracture significantly increased

A

if a crown margin is not placed onto solid tooth

25
Q

how can you achieve a ferrule if one is not already present

A

orthodontic extrusion or crown lengthening

26
Q

how deep should a post go

A

at least halfway down the root to ensure good alveolar bone support

27
Q

what is the ideal post

A

parallel sided
non-threaded
cement retained

28
Q

what does a parallel sided post avoid

A

wedging

29
Q

what does a non-threaded post allow

A

less stress to remaining tooth

30
Q

what categories are post crowns classified into

A

manufacture
material
shape

31
Q

what are the different types of manufactured post crowns

A

pre-formed or custom made

32
Q

what are the materials available for post crowns

A

metal - cast gold/stainless steel/titanium
ceramics - alumina/zirconia
fibre - glass/quartz/carbon

33
Q

what are the shapes that a post crown can have

A

parallel sided or tapered

34
Q

what are the advantages of prefabricated posts

A

only 1 visit required
no impressions or lab needed
chairside core build up
immediate preparation of core
large selection of designs and materials

35
Q

how are custom posts made

A

cast from patients mouth

36
Q

how many visits are needed for custom posts

A

2

37
Q

what material are cast posts made in

A

type 4 heat hardened gold

38
Q

what are the properties of metal posts

A

poor aesthetics, root fracture, corrosion, nickel sensitivity, radiopaque

39
Q

what are the properties of ceramic posts

A

high flexural strength and fracture toughness. favourable aesthetics, difficult retrievability and root fracture common

40
Q

what are the properties of fibre posts

A

flexible, similar to dentine, aesthetic, retrievable, bone to dentine with DBAs
radiolucent

41
Q

what is a core build up

A

internal part of tooth built up with restorative material to replace lost tooth tissue

42
Q

what does the core of a core build up provide

A

retention and resistance for definitive restorations

43
Q

what materials are used for core build ups

A

composite
amalgam
glass ionomer

44
Q

what is a nayyar core

A

RCT removed from canals
amalgam packed into canals and tooth built up

45
Q

what considerations do you need to think of when deciding what restoration to choose

A

how long post is
is there a ferrule
how wide
3-5mm remaining GP
is canal straight
how much space for core

46
Q

how much taper is needed for a core

A

6 degree

47
Q

how much GP is left in apical third of canal

A

3-5mm

48
Q

how do you remove GP

A

dental dam
gates gliddens size 3
working length and rubber stop

49
Q

how much space is left in occlusion for a crown

A

2mm

50
Q

what do you do when trying in a post

A

irrigate with chlorhexidine
dry paper points
ensure fits around prep
enough occlusal clearance?

51
Q

what are the problems with posts

A

perforation
core fracture
root fracture or crack
post fracture

52
Q

how do you manage a post perforation

A

repair internally or externally
extract

53
Q

what is used to remove a post

A

ultrasonics
masseran kit
eggler
moskito forceps

54
Q

what are the reasons for post failure

A

restorative reasons
periodontal problems
endodontic reasons

Endodontics BDS3 (1 decks)

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