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Endodontics 2020 > Canal preparation > Flashcards

Canal preparation Flashcards

1
Q

What are the general principles in canal preparation?

A
  • Removing canal contents
  • Eliminating infection
  • Creating shape
  • Save the teeth
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2
Q

What are the cleaning and shaping objectives?

A
  • Remove infected hard and soft tissue
  • Give disinfecting solutions access to the apical canal space
  • Create space for the delivery of medicaments and subsequent obturation
  • Retain the integrity of radicular structures
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3
Q

Do Endo-Z burs cut on the end?

A

-No they are useful for the final canal preparation

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4
Q

What bur do you use for the outline form in endo?

A

-#330

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5
Q

How do you enter the dentin when doing a root canal?

A

-Long axis to the tooth/root

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6
Q

How do you refine access in the pulp chamber?

A

-Longer cutting bur/diamond that is safe ended

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7
Q

What is the first step to do when doing canal location?

A

-Create line-angle opening for each canal

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8
Q

What do you use to access each main canal?

A

-#15 hand file

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9
Q

How do you distinguish between a hedstrom 15 and a 15 k file?

A

-The hedstrom will have a round black circle on it and the k file will be square (These indicate the cross section of the shank)

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10
Q

How do you estimate the working length?

A

-Radiograph

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11
Q

Gently access the canal within 1-2 mm of what?

A

-Estimated Working Length

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12
Q

How do you gently access the canal?

A

-Watch winding-twiddling with a #10 or #15 to establish canal patency

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13
Q

T/F Access canal with a hand instrument

A

True

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14
Q

What is the last step of access preparation?

A

-Pre-flare

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15
Q

What do you use to do the pre-flare?

A
  • Hedstrom files #15 and #20 with and endo handle
  • Rotary orifice opener
  • Establish straight line access thru coronal 1/3
  • Irrigation
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16
Q

Why do you agitate the irrigation solution?

A

-To dissolve pulp tissue

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17
Q

What do you sometimes have to remove to get straight line access?

A

-Dentinal triangles

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18
Q

How is the coronal canal preparation with gates glidden drills do?

A

-Run a #4 first, then #3, and then #2 (This allows you to get better taper than going #2, #3 ,and then #4

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19
Q

How do you enlarge the mid root size?

A

70 which is a #2 Gates Glidden drill

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20
Q

What do you use a rotary NiTi orifice opener (BR0) for?

A

-Coronal canal preparation

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21
Q

How do you know where to terminate?

A
  • Knowledge of apical anatomy
  • Tactile sensation
  • Radiographic interpretation
  • Apex locators
  • Apical bleeding
  • Pts response
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22
Q

Where do you want to fill the root canal to?

A

-The minor apical diameter

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23
Q

If you hit the major apical diameter have you gone to far?

A

-Yes

24
Q

How far away does the canal apex end from the radiographic apex?

A

.25 to 1 mm away from the radiographic apex

25
Q

What is a glide path?

A

-Smooth radicular tunnel from the canal orifice to the physiologic terminus

26
Q

What is the starting point of radicular preparations?

A

-Glide path

27
Q

What does a glide path ultimately follow and replicate?

A

-The original canal path to preserve the position of natures portal of exit locations

28
Q

When the glide path file = #20 what does that mean?

A

-The #20 K file can go all the way up to the apical constriction and a 10 or 15 would go through

29
Q

What makes space for irrigating solutions?

A

-Cleaning and shaping the canal

30
Q

What do you use for the coronal 1/3 enlargement?

A

-Gates Glidden

31
Q

What do you use for mid-root enlargement?

A

-hand files

32
Q

What does crown down mean?

A

-if you had a #2 gates glidden then the next file you use is a #60

33
Q

What is the MAF?

A

-Master Apical file that is the last file that goes to apical constriction

34
Q

What do you use to maintain patency after each file?

A

10

35
Q

What do you use for the Apical 1/3 shaping?

A

-Hand files rotary files

36
Q

What files can you use in a reaming motion?

A
  • Reamer

- Rotary

37
Q

What is reaming?

A

-Rotating clockwise as flutes engage dentin

38
Q

What is filing?

A

-Bind flutes and scrape out along dentinal walls

39
Q

What can you use for filing?

A
  • K-Files

- Hedstrom files

40
Q

What is circumferential filing?

A

-Move file from wall to wall while scraping

41
Q

What can you use for circumferential filing?

A

-Everything but reamers

42
Q

What is watch winding/twiddling?

A

-Gently and repeatedly rotating instruments apically

43
Q

What instruments can you use for watch winding/twiddling?

A

-All

44
Q

What is the balanced force?

A

-Place, cut with pressure and remove

45
Q

What instruments can you use for balanced force?

A
  • K files

- Reamers

46
Q

Where do you begin up down filing?

A

-Center of canal

47
Q

What does circumferential filing do?

A

-Open the orifice and smooth the canal

48
Q

What do you use to find and negotiate canals?

A

8

  • # 10
  • # 15
49
Q

What do you use for your pre-flare?

A

-#15 and 20 Hedstrom files in the coronal 1/3

50
Q

What do you use for your coronal preparation?

A

-Gates Glidden drills 4, 3, 2

51
Q

What do you use to determine your working length?

A

-#15 file

52
Q

What do you use to establish apical patency?

A

-#10 file

53
Q

What do you use to make your glide path preparation?

A

-#20 file

54
Q

What do you do for the mid-root preparation?

A

-Watch-wind and balanced force from 60 in a crown-down fashion

55
Q

What do you do for the apical preparation?

A

-Watch wind and balanced force from a #20 to MAF with Step back

56
Q

What files can help with our glide path?

A

-Path files 013, 016, and 019

Endodontics 2020 (20 decks)

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