Instrumentation

Question 1

cleaning & shaping aka?

Answer 1

chemomechanical debridement

Question 2

cleaning is what?

Answer 2

removing all canal contents, esp tissue and infective organsms

Question 3

goals of shaping?

Answer 3

enlarge and shape canal to recieve filling material that will seal it well.

Question 4

Radiographic length definition?

Answer 4

full length from reference point to apex

Question 5

Working distance = ?

Answer 5

Length of tooth from reference point to 1mm from apex

Question 6

What is a reference point?

Answer 6

stable reproducible location from which to measure

Question 7

Why subtract 1mm?

Answer 7

to preserve apical constriction (dentin cementum jct)

Question 8

How to determine final WD?

Answer 8

measure distance between guide file and radiographic apex (should be 1mm)

Question 9

Start with what size guide file?

Answer 9

10 then increase until snug

Question 10

What is a glide path?

Answer 10

smooth unobstructed natural path through canal

Question 11

What is recapitulation?

Answer 11

sequential reusing instruments that have been confirmed to reach WD

Question 12

What is patency?

Answer 12

natural unblocked state of tube in body, ability to manipulate file to maintain this

Question 13

2 Things done to create coronal flare?

Answer 13

1. Gates glidden burs 2-4 in brushing motion

2. Crown down with rotary NiTi files

Question 14

NiTi files sequence?

Answer 14

Brown, Green, Blue Red

Question 15

Apical gauging is what?

Answer 15

Increase glide-path hand file until dentin shavings on 1-2 mm end