Endo-Access, Cleaning, Shaping, Obturating Flashcards Preview

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Flashcards in Endo-Access, Cleaning, Shaping, Obturating Deck (71)
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1

What is the material for removing the smear layer?

EDTA

2

What is possibly the most demanding part of a root canal?

Access!

3

Access: the walls should ______ toward the occlusal and try to achieve ______ line access

diverge...straight

4

What burs can we use to look for oraficies?

Mueller burs!

5

Back to anatomy I guess...What % of mand anteriors have 2 canals?

41%!!!

6

MB2 is ALWAYS ______ and _____ compared to MB1!!!

Palatal and MESIAL

7

More anatomy-what % of Maxillary molars have 4 canals?

90-95%

8

What shape should your mand 1st PM have? What are my chances of finding a second canal?? (i experienced this first hand)

ovoid...35%

9

When accessing, make sure to remove ALL sources of _______

bacteria

10

The pulp chamber of a tooth is always located in the _______ of the tooth at the level of the ______

CENTER...CEJ

11

The ORIFICES of the canals are ALWAYS located at the junction of the _____ chamber floor and the _______ chamber walls!

DARK floor....LIGHT walls

12

The orifices of canals are usually located at the ______ of the "dark" floor angle.

vertex

13

The orifices of the canals are SYMMETRICAL with respect to a line drawn in a _____-______ direction at the level of the _____

Mesio-Distal direction at the CEJ

14

The orifices of canals are _______ with respect to each other

SYMMETRICAL

15

There is 1.0 x 10^__ to 1.0x10^__ bacterial cells in the infected root canal, ______ instrumentation reduces the number 100-1000 fold

10 to the 2nd to 10 to the 8th

16

Purpose for IRRIGATION! Wetting the canal walls and flushing of ______ from the canal

debris

17

Purpose for IRRIGATION! Destruction of ________

microorganisms

18

Purpose for IRRIGATION! Dissolution of ______ matter

organic

19

Purpose for IRRIGATION! Removal of the ______ layer and softening of ______

SMEAR....dentin

20

Purpose for IRRIGATION! to clean mechanically ________ areas

inaccessible

21

ANTIMICROBIAL effects of Irrigants-________ introduced as an Endo tx by Coolidge in 1919.

Sodium Hyp-O-Chlor-ITE

22

ANTIMICROBIAL effects of Irrigants-NaOCl shows SUPERIOR ________ action

antibacterial

23

ANTIMICROBIAL effects of Irrigants-NO difference seen in efficacy between ___ and ___ %

0.5 and 5%

24

ANTIMICROBIAL effects of Irrigants- Copious irrigation with NaOCL in conjunction with mechanical instrumentation eliminated bacteria in ___% of cases in controlled studies

50%

25

What size needle do we use to irrigate with?

27g

26

YOU need to be VERY CAUTIOUS not to force irritants out the _____ of the root!

APEX

27

What are the two "appropriate" irrigants?

NaOCl & EDTA

28

Whats the typical [ ] of NaOCl used in dentistry?

5.25% or 2.6%

29

What are the two functions of NaOCl?

1.Anti-bacterial 2.Dissolves tissue

30

What are the two functions of EDTA? What is it used in conjunction with?

1. Chelating agent 2.REMOVES SMEAR LAYER....used in conjunction with NaOCl