Restorative Endodontic Interface

Question 1

what are the types of posts for crowns

Answer 1

direct posts
cast posts and cores

Question 2

what is the indication for a direct post

Answer 2

need a lot of dentine left

Question 3

what are the indications for cast post and cores

Answer 3

no ferrule - not sufficient dentine left

Question 4

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

Answer 4

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

Question 5

what is included in the assessment of RCT

Answer 5

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

Question 6

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

Answer 6

redo it

Question 7

what are the favourable aspects for post design

Answer 7

parallel sided - avoids weding non-threading
cement retained

Question 8

why should posts be parallel

Answer 8

avoids weding

Question 9

why should posts be non-threaded

Answer 9

avoids incorporating stress

Question 10

why should posts be cement retained

Answer 10

buffer between masticatory forces post and tooth

Question 11

what should you asses when designing the restoration

Answer 11

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

Question 12

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

Answer 12

3-5mm

Question 13

what is a ferrule preparation

Answer 13

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

Question 14

what is a ferrule effect

Answer 14

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

Question 15

what does ferrule effect give

Answer 15

resistance to masticatory force and microleakage

Question 16

what is important to consider when designing a core

Answer 16

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

Question 17

what are options for provisional restorations for post crowns

Answer 17

provisional post core crown temp bond
immediate denture
dressing
essex retainer

Question 18

what is a potential pitfall of provisional post core crown

Answer 18

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

Question 19

what can you use to soften gutta percha

Answer 19

super endo alpha or eucaliptus oil

Question 20

what size gates gliddens should be used

Answer 20

minimum size 3

Question 21

how much GP should be left for apical plug

Answer 21

3-5mm

Question 22

what is a para post XP

Answer 22

endo post system for indirect casting technique
different drills

Question 23

what is the narrowest post base tip

Answer 23

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

Question 24

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

Answer 24

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

Question 25

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

Answer 25

0.9mm

Question 26

what would you use for a provisional post

Answer 26

provisional post pro-temp and putty matrix

Question 27

what is a burnout post

Answer 27

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

Question 28

what is the impression post

Answer 28

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

Question 29

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

Answer 29

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

Question 30

what do the para post drills do

Answer 30

widen diameter of the post space

Question 31

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

Answer 31

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

Question 32

where should you trim the provisional para post to

Answer 32

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

Question 33

how do you take a definitive impression for a post

Answer 33

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

Question 34

what is an anti-rotation notch/ groove used for

Answer 34

prevent rotational displacement

Question 35

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

Answer 35

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

Question 36

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

Answer 36

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

Question 37

why should you not fill the post space completely with cement

Answer 37

prevent it seating

Question 38

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

Answer 38

no excess cement around the margins and no bleeding

Question 39

what is a post crown considered

Answer 39

last resort

Question 40

what are some methods of post removal

Answer 40

ultrasonic tips trephan eggler device moskito forceps sliding hammer anthrogyr

Question 41

what is an anthogyr

Answer 41

you tie wires round pontics and it gets it out

Question 42

what is a fractured post removal

Answer 42

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

Question 43

what are problems associated with post crown removal

Answer 43

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

Question 44

what is the fibre post system currently used

Answer 44

DT light post

Question 45

what are some core materials for posterior teeth

Answer 45

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

Question 46

what are paracore or biodentine used for

Answer 46

materials used for core retention in posterior teeth

Question 47

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

Answer 47

24 hours

Question 48

why do we try avoid posts in posterior teeth

Answer 48

narrower roots disadvantages outweigh advantages root canals usually curved

Question 49

what is a nayar core

Answer 49

an amalgam based core - rarely used

Question 50

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

Answer 50

cut a cuspal protection restoration on the tooth

Question 51

why do we put cuspal protection restoration on posterior teeth

Answer 51

prevent catastrophic failure maintain coronal seal prevents microbial ingress