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Endo 2 > Cleaning and Shaping > Flashcards

Cleaning and Shaping Flashcards

1
Q

What are the 9 step prep for shaping canal?

A
  1. Scouting (#10 hand file)
  2. Patency (#10 hand file)
  3. Working Length (#15 hand file) TIGHT file for Radiograph
  4. Glide Path (#15 hand file) LOOSE file ONLY HAND FILES to this point
  5. Shaping of coronal 1/3 of canal (Wave One Gold)
  6. Shaping of middle 1/3 of canal (Wave One Gold)
  7. Perfecting Straight-Line-Access to mid-root (.25/.12 carefully)
  8. Shaping of apical 1/3 of canal (Wave One Gold)
  9. Final Shaping Objective (Apical Gauging) + Vortex Blue or
    Serial Step Back (SSB) using HAND FILES if MAF >#50
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2
Q

Should you use bur, file, or endo explorer to locate all canals?

A

Endo explorer

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3
Q

What motion should be used to scout file (#10)?`

A

Watch winding motion

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4
Q

______ = where the canal exits the tooth

A

Patency

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5
Q

What file is used to check patency?

A

10 file

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6
Q

On an apex locator, what line denotes that you have gotten to patency?

A

Single Red line

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7
Q

If it is ____RESISTANCE to apical advancement, you probably have a
small canal which must be enlarged carefully to reach patency.

A

TIGHT resistance

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8
Q

If it is ______ RESISTANCE to apical advancement, you have
encountered a canal curvature and you must bend the terminal flute of
your file and search for the path to negotiate the curve.

A

LOOSE resistance

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9
Q

____ = 1 mm short of canal exit

A

WL

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10
Q

On anterior teeth, what is the reference point?

A

Incisal edge

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11
Q

On posterior teeth, what is the reference point for WL?

A

• Posteriors: Cusp for which canal is named,
flatten cusp when possible

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12
Q

What file is used to create a smooth glide path?

A

15

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13
Q

• Purposes:
– To smooth curves & make sure there are no canal obstructions.
– To create space for rotary instruments to be used safely without
excessive torque requirements.
– To relieve stress on tip of rotary file to minimize fracture.

A

Glide path

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14
Q

• The ____ is created using hand files (pre-curved to
match or slightly exceed the curvature of the canal) using
watch-wind entry followed by pull strokes directed in a
circumferential manner to enlarge the canal to a size #15 at
the WL. (#15 File should end up SLOPPY LOOSE)

A

Glide Path

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15
Q

What motion should be used with wave one?

A

Pecking motion

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16
Q

What motion should be used on vertex blue files?

A

smooth in smooth out (Cutting mostly on outstroke)

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17
Q

What wave one file is mostly used in most cases?

A

Primary Wave one gold

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18
Q
  1. If a 10 K-file was very resistant to movement, use

Wave One Gold ____ file.

A

Small

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19
Q
  1. If a 10 K-file moves to length easily, is loose or very

loose, use Wave One Gold _____ file. (85%)

A

Primary

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20
Q

How should the files be shaped after glide path is created?

A

In thirds with wave one files

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21
Q

The operator action is a light “pecking” motion. It
is important to note that one must be vigilant as the Wave One action
tends to push debris ahead of the file so stop action at ____ and _____ of
the operation approaching the apex to clean the file and to irrigate
thoroughly at these stages of shaping.

A

1/3 and 2/3 (root length)

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22
Q

What is used to perfect straight line access?

A

.25/.12 vortex orifice

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23
Q

For perfecting straight line access on root, how deep into root should the .25/.12 file be taken?

A

Depth of mid root only

24
Q

• If you are still patent, set the ________ file
at the confirmed WL (Working Length) and reset
the Pro-Mark motor to _____ action and
guide it to advance to the WL.

A

Wave One Gold; reciprocal

25
Q

T/F: • If you have a considerable apical curvature, you
may encounter resistance to advancement at
this point. STOP! Recheck your WL & Pro-Mark
settings. Confirm patency & smooth glide path
with #15 hand file & then irrigate and continue to
WL with Wave One.

A

True

26
Q

What files are used for final shaping?

A

Vortex blue files

27
Q

What size vortex blue file should be used for a small root?

A

30-35

28
Q

What size vortex blue file should be used for a medium root?

A

40-45

29
Q

What size vortex blue file should be used for a large root?

A

45-50

30
Q

Teeth with moderate to severe curvature
require _____ MAF to avoid
transportation of canal.

A

smaller

31
Q

Younger teeth will have larger canals &

require _____ MAF to clean

A

larger

32
Q

The following roots are considered ______ sized:
Mand. Incisors, 2 canal Premolars, M. canals of Mand. molars, B. canals of
Max. Molars

A

Small =

33
Q

The following roots are considered ______ sized:

= Palatal canals of Max. Molars, Single Distal canals of Mand. Molars

A

Medium

34
Q

The following roots are considered ______ sized:

= Max. Anteriors, M/M Cuspids, Single canal M/M Premolars

A

Large

35
Q

◼ We will be using _______ Files for the final
shaping and smoothing of the canal. Sizes
.25/.06 through .50/06 available.

A

Vortex Blue

36
Q

Each Vortex Blue file should be KEPT MOVING
and go completely to WL on each of 10 strokes.
They should be flexed while rotating & being
drawn out to increase the flare of the canal in an
appropriate direction - _______ from furca or ______
the greater dimension of the canal.

A

away from; toward

37
Q

Each Vortex Blue file should be _______
and go completely to WL on each of 10 strokes.
They should be flexed while rotating & being
drawn out to increase the flare of the canal in an
appropriate direction - away from furca or toward
the greater dimension of the canal.

A

KEPT MOVING

38
Q

Shaping is

complete when clean dentinal filings are on _______ 1/3 of vortex blue file

A

Apical 1/3

39
Q

These files will automatically give you a ____ taper of the
Apical Control Zone when carefully taken to the apex in
the proper size. (All lab Vortex Blue files are this TAPER)

A

.06 taper

40
Q

When a Vortex Blue is taken to WL, it should be for no
longer than ____ (period of time) at WL or short of WL or it will begin to
transport the canal. Rotating the file short of the WL will
ALWAYS create a ledge.

A

1 sec

41
Q

When a Vortex Blue is taken to WL, it should be for no
longer than 1 sec. at WL or short of WL or it will begin to
transport the canal. Rotating the file short of the WL will
ALWAYS create a ______

A

Ledge

42
Q

• Primary Etiologies of ____ and ______ disease:
– Caries or other Injuries
– Infected dentin & soft tissue (pulp)
– Micro-organisms and their toxins invade
– Substrate in canal system fuels micro-organisms
– Result is peri-radicular lesion

A

Pulpal & P/A

43
Q

Primary Objectives of ___:
– Remove all caries
– Remove infected dentin & pulp
– Remove micro-organisms & toxins
– Remove substrate from the canal system
– Create a shape encouraging proper obturation
– Seal the root canal system and all portals

A

RCT

44
Q

What are the 5 shaping principles that should be attained by any method of shaping the canal?

A
  1. A constantly tapering funnel from crown to WL
  2. Curves of canal respected w/o “transportation”
  3. Retention of the “apical constriction”
  4. Enlargement of the canal system to create
    clean white filings (adequate cleaning)
  5. Adequate “deep space” for proper obturation
45
Q

SHould all caries be removed or can some be left in endo treatment?

A

All caries must be removed

46
Q

SHAPING: FILES ______

  • REMOVAL OF ALL CARIES AND INFECTED DENTIN
  • ALLOW CONVENIENCE FORM FOR EFFECTIVE IRRIGATION
  • CREATE RESISTANCE FORM TO FACILITATE EFFECTIVE OBTURATION
  • CONSERVE TOOTH & ROOT STRUCTURE TO MINIMIZE VRF
A

SHAPE

47
Q

IRRIGATION: ______

  • KILLS BUGS* - LUBRICATES
  • DILUTES & NEUTRALIZES TOXINS
  • DISSOLVES & REMOVES SUBSTRATE
  • FLUSHES OUT DEBRIS
  • EDTA REMOVES “SMEAR LAYER”
A

CLEANS

48
Q

• ____ consists of a file positioned 1mm. short of the
canal exit & measured at a REPRODUCIBLE
REFERENCE POINT on the crown of the tooth.

A

WL

49
Q

Reproducible _______ are basic to consistent length control*

A

Reference Points

50
Q

Strongly suggest the Reference Points coincide with the ____ for which the
canal is named*

A

cusp (flattened ideally)

51
Q

Is the standard of care less or more for a general dentist than for an endodontist?

A

The same

52
Q 
• A process to create an 
apical resistance form when 
rotary instruments are not 
available due to very large 
canal diameter.
A

Serial step-back

53
Q

Should a canal require enlargement larger than a size

____, it will be necessary to employ SSB.

A

.50

54
Q

What does ACZ stand for in SSB?

A

Apical control zone

55
Q

In a serial step back procedure, will the canal be smooth or stepped to gain ACZ and taper?

A

Stepped; not smooth

56
Q

In a SSB method where a 50 file is the initial apical gauge file, what file is used at ACZ?

A

60

57
Q

For SSB, how often (how. many mm) should the next file size increase coronal to ACZ?

A

Every 1 mm increase file size

Endo 2 (12 decks)

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