Which of the following is used in retreatment of RCT:
Endo irrigant for retreatment cases:
2% chlorhexidine is used as an irrigating solution in retreatment cases of failed RCT. Because, in retreatment cases, major organism to be targeted is E.faecalis. At low concentration (0.2%) of chlorhexidine, its antimicrobial efficacy is less. But at higher concentrations i.e., 2% chlorhexidine causes precipitation of cytoplasmic contents resulting in cell death which is best towards E.faecalis. Apart from this 2% chlorhexidine has a substantivity effect. Studies have shown that against E. faecalis sodium hypochlorite is less effective whereas calcium hydroxide is ineffective.