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BDS3 Endodontics > Restorative Endodontic Interface > Flashcards

Restorative Endodontic Interface Flashcards

1
Q

what are the types of posts for crowns

A

direct posts
cast posts and cores

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2
Q

what is the indication for a direct post

A

need a lot of dentine left

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3
Q

what are the indications for cast post and cores

A

no ferrule - not sufficient dentine left

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4
Q

what should you always ask yourself if you are treating an anterior tooth

A

could you build up a core
does the tooth need a post now

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5
Q

what is included in the assessment of RCT

A

if you’re going to put a post in the tooth it requires a good quality RCT
was it dont using dam and hypochlorite
has it been leaking
how long ago was it done

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6
Q

what should you do if the original RCT was done without dam and hypochlorite

A

redo it

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7
Q

what are the favourable aspects for post design

A

parallel sided - avoids weding non-threading
cement retained

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8
Q

why should posts be parallel

A

avoids weding

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9
Q

why should posts be non-threaded

A

avoids incorporating stress

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10
Q

why should posts be cement retained

A

buffer between masticatory forces post and tooth

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11
Q

what should you asses when designing the restoration

A

how long will it be
have you got a ferrule
how wide
is canal straight
how much space for the core

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12
Q

how much GP should be left at the apex after the post

A

3-5mm

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13
Q

what is a ferrule preparation

A

can place crown margins on solid tooth tissues rather than restorative material
and have 1-2mm sound dentine extending supragingival 360 degrees around where you are going to place the post

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14
Q

what is a ferrule effect

A

when you put a crown on the post that has 1-2mm of dentine all around it and have bracing where the drown meets the ferrule prep

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15
Q

what does ferrule effect give

A

resistance to masticatory force and microleakage

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16
Q

what is important to consider when designing a core

A

taper and length
6 degree taper
2mm of clearance incisal for MCC

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17
Q

what are options for provisional restorations for post crowns

A

provisional post core crown temp bond
immediate denture
dressing
essex retainer

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18
Q

what is a potential pitfall of provisional post core crown

A

if patient is chewing can dislodge the temp and lead to microleakage

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19
Q

what can you use to soften gutta percha

A

super endo alpha or eucaliptus oil

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20
Q

what size gates gliddens should be used

A

minimum size 3

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21
Q

how much GP should be left for apical plug

A

3-5mm

22
Q

what is a para post XP

A

endo post system for indirect casting technique
different drills

23
Q

what is the narrowest post base tip

A

0.9mm in diameter -same as diameter of gates glidden 3

24
Q

why do you need to use gates glidden 3 before using post system

A

because the tip diameter is the same as the narrowest post system bur tip

25
Q

what is the diameter of the tip of a gates glidden 3

A

0.9mm

26
Q

what would you use for a provisional post

A

provisional post
pro-temp and putty matrix

27
Q

what is a burnout post

A

used for a tehcnique where you wax up post core in patients mouth and send to labe

28
Q

what is the impression post

A

post placed into tooth whilst you take definitive restoration for indirect cast post

29
Q

what should you do if you put the gates glidden in and you feel resistance

A

take it out and change angulation so you do not damage inside of the canal

30
Q

what do the para post drills do

A

widen diameter of the post space

31
Q

what do you need to do if the provisional para post is too long

A

get wire cutters to cut at the apical end - leave the pin bit in tact so it helps retain the para core

32
Q

where should you trim the provisional para post to

A

2-3mm of the incisal edge of the adjacent tooth

33
Q

how do you take a definitive impression for a post

A

use a putty wash - make sure the post is completely covered and then use impression material over the top

34
Q

what is an anti-rotation notch/ groove used for

A

prevent rotational displacement

35
Q

what is included in the lab prescription for a cast post and core

A

construct cast post and care
para post colour
core 6 degree taper
please leave 2mm space in occlusion for crown

36
Q

what should you check when the post and core comes back from lab

A

check no residual temp bond
irrigate chlorhexidine 0.2%
dry paper points
ensure fits around prep
ensure enough occlusal clearance

37
Q

why should you not fill the post space completely with cement

A

prevent it seating

38
Q

what do you need to ensure after seating a provisional post core when taking an impression

A

no excess cement around the margins and no bleeding

39
Q

what is a post crown considered

A

last resort

40
Q

what are some methods of post removal

A

ultrasonic tips
trephan
eggler device
moskito forceps
sliding hammer
anthrogyr

41
Q

what is an anthogyr

A

you tie wires round pontics and it gets it out

42
Q

what is a fractured post removal

A

when it is below the dentine collar - consider referral to specialist

43
Q

what are problems associated with post crown removal

A

cant remove it
root fracture
render tooth unrestorable
post space too wide
break the post

44
Q

what is the fibre post system currently used

A

DT light post

45
Q

what are some core materials for posterior teeth

A

composite - best
amalgam - out of fashion
glass ionomer - not really used as it absorbs water and core expands in size

46
Q

what are paracore or biodentine used for

A

materials used for core retention in posterior teeth

47
Q

how long do you need to wait after placing an amalgam core

A

24 hours

48
Q

why do we try avoid posts in posterior teeth

A

narrower roots
disadvantages outweigh advantages
root canals usually curved

49
Q

what is a nayar core

A

an amalgam based core - rarely used

50
Q

what should you consider if treating a tooth that has a RCT

A

cut a cuspal protection restoration on the tooth

51
Q

why do we put cuspal protection restoration on posterior teeth

A

prevent catastrophic failure
maintain coronal seal
prevents microbial ingress

BDS3 Endodontics (2 decks)

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