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Endodontics > Obturation > Flashcards

Obturation Flashcards

1
Q

Steps to endo:

A

diagnose, pretreat, access, clean and shape, obturate, restore

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2
Q

Define obturation:

A

fill and seal cleaned and shaped canal w sealer and core material

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3
Q

Obturation tech we use at SDM:

A

Warm Vertical condensation

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4
Q

Other methods of obturation:

A

Lateral, Warm Lateral, continuos Wave, Carrier-based, single cone

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5
Q

Do sealer and/or gutta purcha klll bac?

A

no

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6
Q

TF? Obturation greatly affects the success rate of endo tx:

A

F. getting all bac out is most imp

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7
Q

Which tech(s) fill(s) the canal the bast?

A

warm

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8
Q

He invented warm vertical condensation:

A

Herbert

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9
Q

Tech’s we use and lab and clinic:

A

lab: traditional Shilder, clinic: continuous wave of condensation (Buchanan)

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10
Q

How to cut gutta percha:

A

to size of MAF (Master Cone)

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11
Q

Sealer we use:

A

Kerr EWT, which is a ZOE

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12
Q

EWT sf:

A

extended working time, ZOE

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13
Q

Fxn of sealer:

A

interface bw gutta-percha and canal walls, fills voids, seals canals,

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14
Q

TF/ Type of sealer doesn’t change success rate.

A

T

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15
Q

TF? Ensure that no sealer extrudes past the apex, this coul lead to serious issues.

A

F. resorbs over time, doens’t matter if we get a little out of the apex

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16
Q

Fxn of heat carriers:

A

to heat gutta-percha

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17
Q

Sizes of pluggers:

A

8-11

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18
Q

Fxn of plugers:

A

condense gutta-percha

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19
Q

Obturation technique:

A

cone fit, cone fit rg, prefit plugger, mix sealer & seat cone w sealer, add accessory cones IF necessary, downpack, downpack rg (working obturation), backfill

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20
Q

Cone fit should hav tug-back here:

A

apical 3rd of canal

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21
Q

What does tugback indicate?

A

a relative degree of adaptation, at least in2 dimensions, not necessarily 3, though

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22
Q

Getting tugback indicates that you may potentially have achieved this form.

A

resistance form

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23
Q

Use this to trim gutta-percha to MAF:

A

gutta-percha gauge

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24
Q

What might it mena if the gp cone will not fit properly?

A

MAF was not determined properly

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25
Q

His recommendation for gp to use:

A

Hygienic ADA Size Fine-Medium

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26
Q

TF? Gp resorbs over time.

A

F

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27
Q

What is false tugback?

A

Gp binding coronally due to not having straight line access to root

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28
Q

What to do if you are having problems fitting multiple cones:

A

reassess canal prep, most likely not tapered properly and/or incorrect MAF

29
Q

How close to the WL must hte cone be on rg?

A

w/in 1mm of WL

30
Q

What may happen if you are binding on canal wall?

A

you may crack tooth

31
Q

Which pluggers are expected to o about 1/2 the WL?

A

the larger pluggers: 10,11

32
Q

The smaller plugges are expected to go w/in how many mm of the WL?

A

5-7mmm size 8,9 pluggers

33
Q

How to choose the correct plugger:

A

Shouldn’t bind walls

34
Q

These should be prefit in canal:

A

one small plugger, 1 large plugger, 1 heat carrier (to 5-7mm of WL)

35
Q

Which is the limiting instrument?

A

heat carrier, you won’t be ablet o downpack if this doesnt reach 5-7mm

36
Q

Sealer we use:

A

ZOE

37
Q

What are the powder and liquid portions of ZOE?

A

powder: zinc oxide and silver
liquid: eugenol

38
Q

Mix sealer on:

A

glass slab

39
Q

Powder to liquid ratio for sealer:

A

1:1

40
Q

How to know if sealer is proper consistency:

A

should string up 1 inch

41
Q

Why do you need to measure paper points before placing in canal?

A

otherwise they may go past foramen

42
Q

What to do before placing gp with sealer:

A

dry canal w paper points

43
Q

TF? Paper point are used to place sealer.

A

F

44
Q

GP cut to MAF:

A

cone

45
Q

How to apply sealer to canal walls:

A

use cone as brush, 2 coats, seat firmly to WL

46
Q

.What is a “bulk of gp?”

A

addition of accessory cones IF there is a lot of space bw the cone and canal walls

47
Q

To create space for accessory cones:

A

endo explorer used as a spreader

48
Q

How to insert accessory cone:

A

twisting motion, won’t got o WL

49
Q

2 phases of obturation;

A

Downpack, Backfil

50
Q

Downpack;

A

compaction of incremental segments of heat-softened gp, to create apical plug

51
Q

Purpose of downpacking:

A

create an apical plug, 3d seal in apical 3rd

52
Q

Instrument to sear off gp at orifice:

A

glick #2 (endo spoon excavator)

53
Q

What should happen w the placement of heat plugger in canal?

A

Gp should stick to heat carrier and be removed from canal

54
Q

Plugger to use for condensing gp after searing gp:

A

larger plugger

55
Q

How far to sink heat carrier into canal:

A

2mm, remove, condense again

56
Q

Heat carrier is to plugger as:

A

remove is to recondense

57
Q

To determine if downpack was successful:

A

Rg from at least 2 angles

58
Q

When to switch from larger plugger to smaller:

A

once you reach 1/2 WL

59
Q

When to take downpack rg:

A

small plugger reaches 5-7mm from WL and walls are clean of gp

60
Q

What to assess of downpack rg:

A

if you reached 5-7mm and if apical 3rd is well filled

61
Q

Defne backfill:

A

injecting and/or compaction of gp into canal after creating an apical seal

62
Q

Backfill tech:

A

Cut gp into 2-3mm segments, warm gp in canal, grab a segment of precut gp w heat carrier, heat in flame, place in canal, condense with small plugger

63
Q

Plugger size to use for Backfilling:

A

small, then large

64
Q

When to switch from small to large plugger in backilling:

A

once you reach 1/2 WL

65
Q

How to clean gp out of coronal area:

A

small cotton pellet

66
Q

Why do we stop backfilling when we do?

A

prevent gp color from effecting tooth esthetic, create an ideal seal of canal

67
Q

Backfill to here for anteriors:

A

Facial CEJ (or just below)

68
Q

Backfill to here for posteriors:

A

pulpal floor, which is always at CEJ

69
Q

Take RG’s in these 2 views to assess backfilling and downpacking:

A

clinical and proximal

Endodontics (22 decks)

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