Endodontics module 5 > Instrumentation > Flashcards

Instrumentation Flashcards

(46 cards)

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1
Q

aim of disinfection

A

removal of organic pulp debris, microorganisms and toxins

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2
Q

aim of shaping

A

controlled removal of dentine to produce a tapering shape that can be disinfected and sealed throughout its length with a root canal filling

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3
Q

biological objectives of endodontic treatment

A
  • confine instrumentation to the root canal
  • prevent extrusion of necrotic debris
  • remove all tissue debris and substrate for bacterial growth
  • create sufficient space for irrigation and intracanal medication
  • complete cleaning and shape in one visit if possible
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4
Q

design objective of endodontic tx

A

create a continously tapering funnel shape

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5
Q

what is the aseptic technique

A
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6
Q

what is this

A

endoblock - measure the length of files

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7
Q

what is this

A

endopot - all dirty files are placed on here

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8
Q

two types of files

A

stainless steel
nickel titanium

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9
Q

drawbacks of stainless steel hand files

A

mishaps (ledges)
debris extrusion
time consuming
less predictable shaped in curved canals

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10
Q

if curved canals are instrumented as if they are straight, what will occur

A

ledging and the apical few mms will remain uninstrumented and infected

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11
Q

hand file technique for hand files and describe is

A

balanced force technique

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12
Q

advantages of rotary niti technique

A
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13
Q

what is canal transportation

A

removal of canal wall on the outer curve in the apical region

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14
Q

what is this

A

endodontic motor

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15
Q

what does torque describe

A

forces that act in a rotational manner

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16
Q

what rpm and torque for rotary NiTi files

A

300 rpm
torque of 4

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17
Q

types of instrument fracture

A
  1. sheer fracture/torsional fracture
  2. flexural fracture/ cyclical fatigue
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18
Q

what is sheer/ torsional fracture

A

occurs when tip of instrument binds to canal wall and the handpiece keeps rotating

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19
Q

what is flexural/cyclical fatigue

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A

caused by common rotation in curved canals

20
Q

would you attempt removal of a fractured instrument in the apical third of the root

21
Q

what type of taper does Protaper universal have

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A

variable taper

the taper changes along its length

22
Q

name the shaping files

23
Q

Name the finishing files

24
Q

Describe the endo sequence of tx

25
what instrument can you use to locate the canal orifice
DG16 (endodontic probe)
26
what file can you use past lubricants (glyde) with
only use with ss files not rotary files
27
where should your preparation end
the junction of pulpal and periapical tissue this is usually the narrowest part of the canal - apical constriction
28
what is this
electronic apex locator
29
what size file do you use with the electronic apex locator
size 10 file
30
what is apical potency
the ability to pass a small flexofile through the apical constriction without widening it
31
why is glide path so important
gives information about canal morphology creates a smooth reproducible path
32
two components of glide path
micro - established with hand instruments macro - enhanced with rotary instrument (pro glider)
33
what does SX do
flare coronal 2-3mm
34
important guidelines for safe use of rotary instrumentation
irrigation before engaging files light pressure do not stop/ start in the canal irrigate, recapitualte and irrigate between each rotary file
35
what file is this
S2
36
what is apical gauging in
determining the precise diameter and taper of the apical constriction to select the master gutta percha
37
how to know when to finish preparation
gauge with size 20 flexofile and inspect F1 file for debris if size 20 file is snug at length and debris on apcial portion of file then preparation is complete
38
what is the instrumentation technique for challenging anatomy
Crown down sequence start preparing from the coronal portion and work way down
39
tool for assessing difficulties of root canals
BES case assessment tool
40
what is the final irrigation
41
what is used as an inter-appointment disinfectant
calcium hydroxide
42
what does odontopaste contain
43
when to use odontopaste
44
method for emergency pulpotomy
45
contra-indications for using ledermix/ odontopaste
46
when is iodine used
used after cleaning and shaping as a final soak for 10 minutes then washed away with final irrigation protocol used in cases not able to destroy E. faecalis e.g., retreatment cases
Endodontics module 5
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