Endo - Irrigation

Question 1

Stages of mechanical prep?

Answer 1

Preparation of the tooth (always isolate with dam)
Access cavity preparation 
Create straight-line access 
Initial negotiations 
Coronal flaring 
Working length determined 
Apical preparation

Question 2

Main bacteria involved in endodontic disease?

Answer 2

E.faecalis

Question 3

What properties make NaOCl a good irrigant?

Answer 3

Very good at dislodging the biofilm and then killing the bacteria.
Dissolves pulp remanents and collagen
Disrupts the smear layer
Only irrigant that destroys any remaining vital and necrotic pulp tissue

Question 4

What varying concentration of NaOCl is used?

Answer 4

0.5-6%

3% in GDH

Question 5

Why is a side head needle used as opposed to a top head needle?

Answer 5

To protect damage to the apex

Question 6

What effect does NaOCl have on dentine?

Answer 6

As it dissolves organic tissue and dentine is mostly organic. Dentine is made weaker and worn down when exposed to NaOCl.

Question 7

To remove the smear layer what is used in tandem with NaOCl?

Answer 7

17% EDTA

Question 8

What does the smear layer prevent?

Answer 8

The smear layer is created after tooth prep and lodges in the dentine tubules. Preventing the sealant from penetrating during obturation

Question 9

What is the irrigation protocol?

Answer 9

3% NaOCl is used throughout prep (30ml)
Then once finished, 17% EDTA is used to remove the smear layer. This is left in the canal for 1min.
A final rinse with 3% NaOCl
Then dry with paper points before obturation of GP begins