Endodontic Irrigation

Question 1

How does mechanical shaping aid irrigation?

Answer 1

• creation of space
  
  • allows delivery of irritant to apical third
    
    • location of majority of lateral/accesory

Question 2

What is the irrigant of choice?

Answer 2

3% sodium hypochlorite

Question 3

What equipment should be used to deliver 3% NaOCl?

Answer 3

• Leur lock syringe
• 27 gauge endo needle

Question 4

How should 3% be administered to a canal?

Answer 4

• passively flushed through the root canal
  
  • light finger pressure
    
    • forefinger rather than thumb
• not forced into canal
  
  • tip of irrigating needle withdrawal from apex
• rubber stopper on syringe
• constant aspiration
  
  • as close to access cavity as possible
  • no pooling of irrigants around tooth

Question 5

At what rate should 3% NaOCl be administered?

Answer 5

1 minute per 3ml syringe

Question 6

What should the penultimate irrigant be?

Answer 6

17% EDTA

Question 7

What is the function of EDTA?

Answer 7

removal of the smear layer

Question 8

How long should the final soak of a canal be and what irrigant should be used?

Answer 8

10 minute soak with 3% sodium hypochlorite