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Endodontics II > Lecture 2: Cleaning & Shaping > Flashcards

Lecture 2: Cleaning & Shaping Flashcards

1
Q

Determine what type of canal is seen below:

A

Type I

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2
Q

Determine what type of canal is seen below:

A

Type II

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3
Q

Determine what type of canal is seen below:

A

Type III

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4
Q

Determine what type of canal is seen below:

A

Type IV

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5
Q

What are the five principles to shaping?

A
  1. a CONSTANTLY TAPERING FUNNEL from crown to WL
  2. CURVES OF CANAL RESPECTED without transportation
  3. Retention of the APICAL CONSTRICTION
  4. ENLARGEMENT OF THE CANAL SYSTEM to create clean white fillings
  5. ADEQUATE DEEP SPACE for proper obturation
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6
Q

List the nine steps following proper access:

A
  1. scouting (#10 hand file)
  2. patency (#10 hand file)
  3. working length (#15 hand file) TIGHT file
  4. glide path (#15 hand file) LOOSE file

—ONLY HAND FILES TO THIS POINT—-

  1. shaping of coronal 1/3 of canal (wave one gold)
  2. shaping of middle 1/3 of canal (wave one gold)
  3. perfecting straight-line-acess to mid-root (.25/.12)
  4. shaping of apical 1/3 of canal (wave one gold)
  5. final shaping objective (vortex blue)
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7
Q

When using hand files after the shaping of the apical 1/3 of canal, this process is called:

A

SSB (serial step back)

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8
Q

What file is used for scouting?

A

10

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9
Q

What file is used to find patency?

A

10

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10
Q

What motion is used during scouting?

A

watch winding

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11
Q

The gentle, right & left rocking motion, which causes the instrument to cut while a light and inward pressure (straight arrow) keeps the file engaged and progressing towards the apex:

A

watch winding

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12
Q

The canal is _____ when a #10 file goes slightly beyond the apex and 0.5mm into the PDL

A

Patency

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13
Q

When watch-winding, how many degrees each way?

A

30 degrees

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14
Q

The canal is _____ when a #10 file goes slightly beyond the canal exit (0.5mm) = long = into the PDL

A

Patent

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15
Q

The ______ will help us located the canal exit clinically

A

apex locator

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16
Q

Patency is maintained by:

A

recapitulation

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17
Q

Patency is maintained by recapitulation which is:

A

irrigated and resisting patency after wave one with the #10 file

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18
Q

When trying to obtain patency, if there is TIGHT resistance to apical advancement, you probably have:

A

small canal

19
Q

When trying to obtain patency, if there is LOOSE resistance to apical advancement, you probably have:

A

canal curvature

20
Q

All shaping is done at:

A

WL

21
Q

What is the reference point for anteriors?

A

incisal edge

22
Q

What is the reference point for posteriors?

A

Cusp for which canal is named

23
Q

On the apex locator what denotes patency?

A

single red line

24
Q

How do you tell if two canals converge or are simply two canals in close proximity?

A

The 2 file technique

25
Q

What is being described below?

  1. establish working length of “each canal” separately
  2. attempt to place 2 files to WL in each canal at the same time
  3. If both go to working length this means you have two canals
  4. If one goes to WL and the other is short, reverse the placement sequence and if one is still short this means you have a converging class II canals
A

2 file technique (to determine if there are two canals in close proximity or if canals converge)

26
Q

To determine if there are two canals in close proximity or if canals converge:

If both files go to working length:

A

2 canals

27
Q

To determine if there are two canals in close proximity or if canals converge:

Only one canal goes to WL:

A

canals converge to single apical exit

28
Q

You should create a smooth glide path only after:

A

WL is confirms with #15 hand file

29
Q

List the purposes of creating a smooth glide path: (3)

A
  1. smooth curves and make sure no canal obstructions
  2. create space for rotary instruments
  3. to relive stress on tip of rotary file (minimize fracture risk)
30
Q

The glide path is created using:

A

Hand files (pre-curved to match or slightly exceed the curvature of the canal); watch-winding entry & pull strokes

31
Q

What motion do we use when using waveone gold to shape the canals?

A

Light “pecking” motion

32
Q

When do we perfect the straight-line access to mid-root?

A

following second 1/3 shaping with wave one

33
Q

What do we use to perfect straight-line access to mid-root?

A

.25/.12 Vortex orfice opener

34
Q

What files are used for the final shaping and smoothing of the canal?

A

Vortex blue files

35
Q

Radiographs will generally show ____ & ____ curves

A

mesial & distal

36
Q

____ & ____ curves will usually NOT be seen on the radiograph

A

facial & lingual

37
Q

A bulls eye indicates:

A

root tip severely turns to facial or lingual

38
Q

What can happen when we place a straight hand file in a curved canal?

A

Ledges & blockages

39
Q

A ledge can be the first step to _____ or ____

A

blockage or transportation (outside wall)

40
Q

____ of apex occurs within the root. This may also be called:

A

tranportation; zip

41
Q

If a zip occurs through the apex to the exterior of the root, we have an:

A

apical strip perforation

42
Q

Occurs when files used are either too large or too aggressively used for a small and thin walled canal:

A

strip perforation

43
Q

Strip perforations commonly occur on the distal or mesial root of ____ and MF of _____ & _____

A

lower molars; upper molars; 2-canal premolars

44
Q
A

Endodontics II (10 decks)

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