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Endotontics > Obturation > Flashcards

Obturation Flashcards

1
Q

why obturate?

A

seal portals of entry apically, laterally, and coronally

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2
Q

when do we obturate?

A
  1. root canal system is adequately cleaned and shaped and s of such size and shape to accomodate the filling material and/or technique of choice
  2. RCS is DRY
  3. there is NO FOUL ODOR
  4. tooth is NOT SYMPTOMATIC
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3
Q

where do you fill/obturate to?

A

The cemento - dentinal junction

radio graphic apex

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4
Q

what do you fill?

A

as much of the root canal system as possible

  • the main root canal
  • lateral/accessory canals
  • fins and isthmuses
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5
Q

what material are we using to fill?

A

gutta-percha and sealer

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6
Q

what opacity should root filling material be?

A

radio-OPAQUE

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7
Q

what are the components of gutta-percha?

A

20 % gutta percha
65% zinc oxide
10% metallic salts
5% waxes

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8
Q

what are the two size of GP we are using?

A
  1. fine medium

2. medium

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9
Q

Gutta percha disadvantages

A
  1. lack of rigidity
  2. lack of length control
  3. lacks adhesive quality
  4. shrinkage
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10
Q

what happens to gutts percha as it cools? what phase?

A

it shrinks

shrinkage occurs when go from alpha phase to beta phase

alpha phase is 42-44 celcius

beta phase is 37 degrees celcius

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11
Q

describe sealers

A

they aid in establishing a good seal

they serve as a filler for canal irregularities and minor discrepancies between root canal wall and core filling material

they also seal lateral and the accessory canals and assist in microbial control

they can act as lubricants for the GP

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12
Q

acceptable types of sealers?

A
  1. ZOE based
    - zinc eugonel
    * *one we use
    - powder is zonc oxide and liquid is the eugenol
  2. CaOH based
  3. Resin based
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13
Q

why cant you just use sealer?

A

it will dissolve in body fluids over time (months)

the GP and sealer together cause an intimate associated b/w the mixture and the canal walls to create the seal

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14
Q

ideal properties of root canal sealers

A
  1. tacky when mixed to provide good adhesion berween it and RCS when set
  2. Hermetic (air tight seal)
  3. RADIO-OPAQUE
  4. very fine powder so can mix easily with liquid
  5. doesn’t shrink when setting
  6. want it to be
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15
Q

liquid component of sealer

A

Eugonel

  • 4-allyl- 2 methoxypheno
  • balsam resin and water
  • eugenol
  • oil of clove
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16
Q

how do we at BU obturate

A

Warm vertical compaction

- the multiple wave compaction SCHILDER TECHNIQUE

17
Q

Acceptable methods of obturation

A
  1. Lateral compaction
  2. carrier based compaction
  3. hydraulic compaction
  4. warm vertical compaction
18
Q

Acceptable methods of obturation

A
  1. Lateral compaction
  2. carrier based compaction
  3. hydraulic compaction
  4. warm vertical compaction
19
Q

describe lateral compaction

A

adding multiple GP cones and compacting them together

they are ‘cold-welded’ together but there are still gaps between many points which must be filled with sealer

20
Q

describe carrier based compaction

A

put in a heated carrier which appears to make it easier but actually technique sensitive and hard to retrieve and difficult to prepare a post space with

21
Q

describe hydraulic compaction / condensation with bioceramic sealer

A

sealer that is biocompatible

  • non toxic
  • doesnt cause irritation if extrusion occurs
  • forming bond with dentin because forms hydroxyapatite during setting **
  • hydrophilic

but it is expensive and very hard to retreat or creae a post space with

it is also not a 3D fill in large canals

22
Q

two techniques in warm vertical compaction?

A
  1. multiple wave compaction
    - Schilder Technique
  2. Continuous “SINGLE” wave compaction
    - buchannan Technique
23
Q

why do we compact?

A

to compensate for shrinkage of gutta percha

24
Q

how do we avoid loosing seal when doing warm vertical compaction?

A

since GP shrinks upon cooling from 42 degrees, any seal gained by heating threatens to be lost via shrinkage unless the ,material is COMPACTED to compensate for this shrinkage

25
Q

general description of warm vertical compaction

A

involves the application of heat and pressure to compact GP

involve two steps :

  1. down - pack
  2. back fill
26
Q

9 pluggers range from what sizes?

A 
8
8 1/2 
9
9 1/2 
all the way to 12
27
Q

tip diameters of pluggers that correspond to the associated plugger

A 
8 = .4 mm
8 1/2 =.5mm
9 = .6 mm
9 1/2 = .7 mm
10 = .8mm 
10 1/2 = .9mm 
11 = 1.1 mm
11 1/2= 1.3 mm 
12 = 1.5 mm
28
Q

two things you need to apply before doing cone fit?

A
  1. EDTA in canal - this solution must remain in canal for a minimum of 1-2minutes in order to remove the smear layer
  2. place cone in NaOCL for 60 seconds to disinfect the cone before fitting
29
Q

how do you selec master cone?

A

select cone that is the same taper as the last instrument used at working length

  • need to feel A TUG BACK at the area of the apex

if it does not go to working length it is too large

30
Q

how much of gutta percha do you coat with sealer?

A

the apical 3mm

31
Q

when heat hits GP how much farther from where it touches will it also heat?

A

about 3mm or so beyond

32
Q

first pluggers shuold be what size ?

A

big because you’re at the coronal aspect

33
Q

what is a hotshot used for?

A

a GP gun for the back fill

has 20, 23, or 25 gauge needles

34
Q

what did one study determine the maximum temperature bone could withstand before death of osseous cells?

A

occurred at 47 degrees celcius

IF YOU CAUSE A TEN DEGREE OF CHANGE YOU COULD BURN IT – cause damage to the PDL cells

  • But touch n heat usually only changes it about 2-3 degrees

so studies have shown 3-4 seconds at 200 degrees farenheit are safe for most teeth

35
Q

what is the critical increase in the PDL before IRREVERSIBLE damage is sustained

A

10 degrees Farenhieit

36
Q

before sealing the access cavity (after obturation) what do you need to make sure?

A

it is asymptomatic, no discoloration, no pain, no clinical signs of failure like sinus tracts,

Endotontics (21 decks)

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