Materials

Question 1

Purpose of an irritant

Answer 1

Bacteriocidal
Dissolve organic and informatics debris
Smear layer removal
Aid passage of instruments
Flush out debris

Question 2

Properties of an irritant

Answer 2

Anti microbial
Low surface tension liquid
Lubircate
Remove smear
Biocompatible
Dissolve orangic matter
Low cost / avaliable
Be active in presence of blood and tissue fluid

Question 3

Sodium hypochlorite pH how to increase effectiveness

Answer 3

11
Temp
Exposure time -40 mins
Copious 10-20ml per canal

Question 4

Properties of chlorhexidine

Answer 4

Very bactericidal
Biocompatible
Good substantivity
Doesn’t dissolve orangic or inorganic tissue or remove smear
Ph reduces in presence of orangic matter
Good for retx
Broad spec antimicrobial
Don’t mix with naocl- orange

Question 5

Why shouldn’t you mix irritants ?

Answer 5

Can reduce effectiveness
PCA - orange - chx and sodium hypochlorite

EDTA deactivates naocl by reducing avaliable chloride

EDTA and chx cloudy white precipitate

Question 6

How should hypochlorite be delivered

Answer 6

Side venting locking syringe (1mm ahead) less likely to extrude and space around
Passive
Continuous movement

Question 7

What’s in gp

Answer 7

It’s mostly zinc oxide, with gutta-percha providing structure, and barium sulfate making it visible on radiographs.