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Endodontics II > Lecture 2: > Flashcards

Lecture 2: 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 5 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 9 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-access 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 with wave one gold, 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 should be used during scouting?

A

Watch winding

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11
Q

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

A

Watch winding

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12
Q

When watch-winding, how many degrees each way?

A

30 degrees

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13
Q

The canal is ____ when a #10 file goes slightly beyond the canal exit (0.5mm)= Long- into the periodontal ligament

A

patent

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14
Q

The ____ will help us locate the canal exit clinically

A

apex locator

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15
Q

Patency is maintained by:

A

recapitulation

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16
Q

Patency is maintained by recapitulation- which is:

A

irrigating and revisiting potency after wave one with #10 file

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17
Q

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

A

small canal

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18
Q

When trying obtain patency, if there is LOOSE resistance to apical advancement, you have encountered a ____ .

A

canal curvatures

19
Q

All shaping is done at:

A

WL

20
Q

What is the reference point for anteriors?

A

incisal edge

21
Q

What is the reference point for posteriors?

A

cusp for which canal is named

22
Q

On the apex locator, what denotes patency?

A

single red line

23
Q

How do you tell if canals converge or are simply 2 canals in close proximity?

A

The 2 file technique

24
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 2 canals
  4. If one goes to WL and the other is short, reverse the placement sequence, and if one is still still short this means you have a converging class II canals
A

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

25
Q

To determine if there are 2 canals in close proximity or if canals converge:

If both files go to working length:

A

2 canals

26
Q

To determine if there are 2 canals in close proximity or if canals converge:

Only one file goes to WL:

A

canals converge

27
Q

You should create a smooth glide path only after:

A

WL is confirmed with #15 handfile

28
Q

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

A
  1. smooth curves & make sure no canal obstructions
  2. create space for rotary instruments
  3. to relieve stress on tip of rotary file (minimize fracture risk)
29
Q

The glide path is created using:

A

hand files (pre-curved to match or slightly exceed the curvature of the canal); watch-winding motion

30
Q

What motion do we use when using Wave One Gold to shape the canals?

A

light “pecking” motion

31
Q

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

A

following 2nd 1/3 of shaping (with wave one)

32
Q

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

A

.25/.12 orfice opener

33
Q

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

A

Vortex blue files

34
Q

Radiographs will generally show ___ & ___ curves

A

mesial & distal

35
Q

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

A

facial & lingual

36
Q

A bullseye indicates:

A

root tip severely turns to facial or lingual

37
Q

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

A

ledges and blockages

38
Q

A ledge can be the first step to ___ or ___

A

blockage or transportation (outside wall)

39
Q

_____ of apex occurs within the root. This may also be called ___.

A

Transportation; zip

40
Q

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

A

apical strip perforation

41
Q

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

A

Strip-perforation

42
Q

Strip perforations communal occurs on the distal or mesial root of _____, and MF of ____ & ____

A

lower molars; upper molars & 2 canal PMs

43
Q
A

Endodontics II (9 decks)

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