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Endo 2 > Cleaning and Shaping 2: Curved Canals > Flashcards

Cleaning and Shaping 2: Curved Canals Flashcards

1
Q

Are most canals straight or curved?

A

Curved

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2
Q

Can wave one canal file be autoclaved?

A

No

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3
Q

Should you curve SS file before putting it in canal?

A

Yes

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4
Q

The new shaping routine with greatly improved modern files
and electric torque control motors should virtually eliminate
_____ and ______

A

ledging and canal transportation.

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5
Q

Beyond ___ degrees of curvature, it is very difficult; refer

A

30 degrees

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6
Q

Radiographs will generally

show ___ and _____ curves.

A

mesial and distal

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7
Q

____ and _____ curves will

NOT generally be seen:

A

Facial and lingual

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8
Q

_______ configuration may reveal

apex curving severely to Facial or L.

A

“Bulls eye”

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9
Q

________ etc. is one of the MAIN
REASONS that we selected the current
technique in which hand files used are
generally no larger than #15

A

Transportation,

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10
Q

____ is the smaller part of the
funnel created by the apical failure to
follow the curved canal

A

Elbow

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11
Q 
s our shaping proceeded to the 
larger sizes of SS hand files above 
#15 (previously necessary to cleaning 
and shaping): a geometric progression
- Increase in \_\_\_\_
- Decrease in \_\_\_\_\_\_
A

Stiffness*

Flexibility*

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12
Q 
The above characteristics of SS hand 
files as sizes increase work to 
dramatically straighten out the 
canal curvature resulting in:
\_\_\_\_ and \_\_\_\_\_\_
A

Ledges & Blockages*

Canal Transportation*

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13
Q

Transportation of apex occurs within

the root. The result is called a ____

A

Zip

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14
Q

As SS hand files increase in diameter beyond the flexible #08-15 files,
they increase greatly in stiffness & decrease greatly in flexibility
______ adaptation to the natural curve of the canal.

A

resisting

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15
Q

If there is a severe curve in the canal –
especially if the curve occurs in the apical
1/3 and a _________ was not
perfected and the operator tries to PUSH
or Force the Wave One Gold file to WL

A

very smooth glide path

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16
Q

_____ can still OCCUR
• By allowing the Vortex Blue finishing files
to rotate at or slightly short of WL for
more than 1 moment*

A

Transportation

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17
Q

KEEP THE VORTEX BLUE FILE _____
using a smooth in-out motion in the canal
while flexing it on the out stroke to smooth
and further flare the walls.

A

MOVING

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18
Q

When we place a straight SS hand file in a curved canal:
• Physics dictates it must track the OUTSIDE (convex) wall of the canal at some point. What does this do?
• Tends to gouge and attack the outsidewall of the canal creating the a _____ ,which can be the first step to ____ or ______

A

Ledge; Blockage or Transportation

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19
Q

When we place a straight SS hand file in a curved canal:
• Physics dictates it must track the ______ wall of the canal at some point. What does this do?
• Tends to gouge and attack the outside wall of the canal creating the a Ledge,which can be the first step to Blockageor Transportation

A

OUTSIDE (convex)

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20
Q

If we keep Pushing & Grinding on the file, we can eventually force it through the root to create a _______

A

Perforation

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21
Q 
The Curved File is to be oriented
correctly to \_\_\_\_\_ or \_\_\_\_\_ 
the curvature of the canal , introduced 
in a gentle watch-winding motion and 
then flexed in a rasping pull motion 
with circumferential filing after the 
path is negotiated.
A

coincide or slightly exceed

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22
Q 
\_\_\_\_\_ and \_\_\_\_\_\_
• Are  the biggest issues and are the 
reasons we changed to modern Ni-Ti 
files, expensive motors and a new 
technique.
A

Ledging & Transportation

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23
Q 
\_\_\_\_\_ files are STRAIGHT – BUT:
– Extremely Flexible* but will transport  if 
inattentive & pushed*
– Super-Elastic* and Expensive*
• Not pathfinders
• Will only follow a smooth glide path*
A

Ni-Ti

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24
Q

TO AVOID BLOCKAGE:______

A

IRRIGATE

25
Q

TO AVOID LEDGING: ________

A

CURVE & INSERT FILES

CORRECTLY AND IRRIGATE

26
Q

TO AVOID FILE SEPARATION: ____________

A

SINGLE USE FILES

INSPECT & DON’T SKIP SIZES OR FORCE

27
Q

Bend every file in a gentle curve _____ entering canal.

A

before

28
Q

f you successfully negotiate a difficult curve (tight resistance), spend lots of time flexing & working with the _____ file before moving to the next larger size*** “100 strokes”

A

small

29
Q 
if a LEDGE is created 
or if we encounter LOOSE 
RESISTANCE to apical 
advancement (= A CURVE), we 
modify the curvature to include 
the very terminal flute of the 
SMALL FILE to about a \_\_ degree 
curve to bypass the curve toward 
the inner wall or to scout for the 
direction of the CURVE
A

45

30
Q

Most Common Causes of _______:

  • Failure to RECAPITULATE***
  • Failure to Gain and Maintain Patency
  • Failure to recognize LOSS OF LENGTH ledge/blockage/curve
  • Dentin mud is harder than dentin
A

Blockage:

31
Q

Occurs when files used are either too large or too
aggressively used for a small or thin walled canal.
• Commonly the distal of the mesial root of lower molars,
MF of upper molars , 2 canal max. PM .

A

Strip Perf

32
Q

What 3 locations do strip perf most commonly occur?

A

distal of the mesial root of lower molars,

MF of upper molars , 2 canal max. PM .

33
Q

MB1 and MB2 (Maxillary Molars) (__% two

canals)

A

95%

34
Q

DF and DL of Mandibular Molars (Join ___ %

Type II)

A

60%

35
Q

MF and ML of Mandibular Molars (Join ___%

Type II)

A

40%

36
Q

Maxillary 1st Premolars (___% have two roots)

A

85%

37
Q

If we 1st create a smooth glide path in the
MB canal. The .25-.12 rotary file
can be inserted ____ mm into the canal and
while rotating at 500 rpm be carefully
uprighted to remove the dentin triangle and
align the access to a more advantageous
path to the canal – thereby making it much
easier to shape the apical curvature.

A

3-4mm

38
Q

If we 1st create a smooth glide path in the
MB canal. The .25-.12 rotary file
can be inserted 3-4mm into the canal and
while rotating at 500 rpm be carefully
______ to remove the dentin triangle and
align the access to a more advantageous
path to the canal – thereby making it much
easier to shape the apical curvature.

A

uprighted

39
Q

What file is used to refine straight line access in an incident of high cervical break by uprighting?

A

Vortex .25/.12

40
Q

What is the main reason files break/separate?

A

Pushing too hard

41
Q

The larger the instrument or the tighter the curve, the greater the stretching on the outer diameter of the curved instrument and the greater the compression on the inner diameter of the curve = ________

A

Torsional Stress

42
Q

Additionally, greater acceleration of the curve results in increased stress from stretching and compressing resulting in increased _________

A

Cyclic Fatigue.

43
Q 
Attempting to 
take a rotary 
file through a 
\_\_\_\_\_\_\_\_\_ is 
an almost 
certain 
prelude to 
instrument 
separation
A

convergence

of canals

44
Q 
T/F: If you feel as if you need to PUSH the 
rotary file to get it to advance, go 
back and smooth or carefully enlarge 
the glide path with a small properly 
curved hand file.
A

True

45
Q

Anytime obturation is
not yet accomplished,
this is an indication for
__________

A

intracanal medication.

46
Q

What needs to be placed over layer of CaOH every time it is used in a canal?

A

Cotton

47
Q

____ is currently the singular most popular intra-canal medication to use for disinfection of canal btwn visits

A

CaOH

48
Q

CaOH is placed about _______ in relation to WL; and where does it stop?

A

2 mm short of WL; Fill the canal not chamber

49
Q

____ is a great temp for anterior teeth with light occlusion

  • Not good for 2 surface restorations
  • CAN’T BE USED ON VITAL TEETH
  • COmes from the tube or jar ready to place in tooth without mixing; seals better than IRM but deteriorates rapidly
A

Cavit

50
Q

______: temp material 1-4 week seal duration = stronger

- Can be used when 2 or more surfaces are missing

A

IRM

51
Q

_____ is reccommended to seal obturated canal against leakage following successful RCT completion while awaiting perm restoration

A

Vitrebond

52
Q

How do you close the RCT if post is used later?

A

NO vitrebond

Place temp restoration over cotton pellet

53
Q

If treatment plan calls for crown, how do you close up tooth after RCT?

A

No Cotton over obturation

Place Temp on it

54
Q

In the anteriors , how do you restore a tooth with. minimal structure loss?

A

Vitrebond and composite

55
Q

In the anteriors , how do you restore a tooth with.significant structure loss?

A

Crown or Post and Crown

56
Q

In the posterior , how do you restore a tooth with. minimal structure loss?

A

Crown

57
Q

In the posterior , how do you restore a tooth with significant structure loss?

A

Crown and post

58
Q

Do posts strengthen or weaken tooth?

A

Weaken; provide retention

Endo 2 (12 decks)

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