Endodontic Irrigation: Cleansing of the Root Canal System
THE NEXT DDS
After viewing this video, the viewer should:
how to properly use an antibacterial irrigant to clean a canal
the characteristics of good antibacterial, antimicrobial irrigants
Instrumentation alone will not sufficiently clean all the internal
surfaces of the root canal; antibacterial irrigants are needed to eradicate the
remaining micro-organisms. Irrigants should be antimicrobial, have a low
surface tension, not be mutagenic, carcinogenic or cytotoxic, possess
tissue-dissolving properties, aid the removal of smear layer, have a long shelf
life, and preferably be inexpensive
Sodium hypochlorite has been used as an irrigant in endodontics for many
years. It is inexpensive, readily available, highly antimicrobial, and has
tissue dissolving properties. While sodium hypochlorite is commonly available
as a 5.2% solution, it is highly effective, and widely used, as an
antibacterial agent when diluted to a 2.5% solution. By diluting the solution
the potential irritating effect on periapical tissues is reduced.
Irrigants can be introduced into the root canal with the use of a
syringe. It is critical that the syringe tip not be engaged in the canal. The
clinician must be aware of the potential piston effect of an irrigating
solution when it is delivered close to the periapical foramen. It is suggested
that the solution be deposited at the mouth of the canal and then work down the
canal system with instruments.
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