Root Canal Preparation

Question 1

What are 4 principles of canal preparation?

Answer 1

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

Question 2

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

Answer 2

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

Question 3

What are the 3 principles of straightline access?

Answer 3

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

Question 4

What are the 3 principles of Patency and working length?

Answer 4

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

Question 5

Step-back progressive refers to which principle?

Answer 5

Glide path

Question 6

What are the two principles of mid-root preparation?

Answer 6

1-Crown-down

2-Balance force technique

Question 7

What are the two principles of Apical preparation?

Answer 7

1-Step back progressive with hand files

2-with Rotary instruments

Question 8

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

Answer 8

1-Rake angle
2-Sharpness
3-Force applied

Question 9

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

Answer 9

Positive rake angle

Question 10

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

Answer 10

Neutral Rake Angle

Question 11

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

Answer 11

Negative rake angle

Question 12

Which files have neutral of slightly negative rake angles?

Answer 12

K-files

Question 13

Which files have positive rake angles?

Answer 13

Hedstrom files

Question 14

Rotating the instrument clockwise as flutes engage is called?

Answer 14

Reaming

Reamer/rotary

Question 15

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

Answer 15

Filing

K-files/hedstrom

Question 16

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

Answer 16

Circumferential filing (all but reamers)

Question 17

Placing, cutting with pressure and removing is called?

Answer 17

Balance force (K-files and reamers)

Question 18

Gently and repeatedly rotating instruments apically is called?

Answer 18

Watch winding/twiddling (All are used for this)

Question 19

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

Answer 19

Major apical diameter

*minor apical diameter is at the apical constriction

Question 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?

Answer 20

Glide path

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