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Flashcards in Root Canal Preparation Deck (20)
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1

What are 4 principles of canal preparation?

1-Continuous tapering funnel from apex to the access cavity
2-Preparation should flow with the shape of original canal
3-Aprical foramen remains in its original position
4-Apical opening as small as practical

2

What are the 5 general principles of Root canal preparation at the School?

1-Straight-line access
2-Patency and working length
3-Glide path
4-Mid-root prep
5-Apical preparation

3

What are the 3 principles of straightline access?

1-Find the canal
2-Negotiate, explore, smooth
3-Pre-flare coronal canal

4

What are the 3 principles of Patency and working length?

1-Tactile feel
2-Electronic apex locator
3-x-ray/radiograph

5

Step-back progressive refers to which principle?

Glide path

6

What are the two principles of mid-root preparation?

1-Crown-down
2-Balance force technique

7

What are the two principles of Apical preparation?

1-Step back progressive with hand files
2-with Rotary instruments

8

What three things determine the size and shape of the dentin chips produced by files?

1-Rake angle
2-Sharpness
3-Force applied

9

Which rake angle digs into the substrate making the biggest chip?

Positive rake angle

10

Which rake angle is perpendicular to the surface and scrapes along it?

Neutral Rake Angle

11

Which rake angle glides over the top of the substrate causing the smallest chips?

Negative rake angle

12

Which files have neutral of slightly negative rake angles?

K-files

13

Which files have positive rake angles?

Hedstrom files

14

Rotating the instrument clockwise as flutes engage is called?

Reaming

(Reamer/rotary)

15

Binding the flutes and scraping out along the dentinal walls is called?

Filing

(K-files/hedstrom)

16

Moving the file from wall to wall while scraping is called?

Circumferential filing (all but reamers)

17

Placing, cutting with pressure and removing is called?

Balance force (K-files and reamers)

18

Gently and repeatedly rotating instruments apically is called?

Watch winding/twiddling (All are used for this)

19

The flaring out of the cana after it passes through the apical constriction at the end of the root is called?

Major apical diameter

*minor apical diameter is at the apical constriction

20

Having an unobstructed path from orifice to terminus that defines the natural canal with smooth walls and removes all or most of the pulp tissue is the goal of what?

Glide path

*reduces errors such as ledging, lose of potency etc.