Abstract
Introduction
Complete endodontic system disinfection requires the removal of vital and necrotic
pulp tissue, microorganisms, and toxins. The purpose of this study was to compare
the effects of 2 ultrasonic irrigation techniques on the penetration of sodium hypochlorite
into the main canal and simulated lateral canals of extracted teeth.
Methods
Two simulated lateral canals each were created 2, 4, and 6 mm from the working length
in 60 single-rooted teeth (6 canals/tooth, n = 360). To resemble the clinical situation,
a closed system was created in each tooth. The teeth were randomly assigned to 3 experimental
irrigation groups: group 1 (n = 20), positive pressure irrigation (PPI); group 2 (n
= 20), passive ultrasonic irrigation (PUI); and group 3 (n = 20), continuous ultrasonic
irrigation (CUI). Samples were evaluated by direct observation of still images recorded
under a dental operating microscope. To examine irrigating solution penetration, 20%
Chinese ink (Sanford Rotring GmbH, Hamburg, Germany) was added to a 5% sodium hypochlorite
solution and delivered into the root canals.
Results
The results showed a significantly higher (P < .05) penetration of irrigant into the lateral canals in the CUI group. PUI and
CUI did not differ significantly in solution penetration into the apical thirds of
the main canals. The PPI group showed a significantly lower penetration of sodium
hypochlorite into the main and lateral canals compared with the CUI and PUI groups.
Conclusions
CUI as a final rinse significantly increased the penetration of irrigating solution
into simulated lateral canals.
Key Words
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Article info
Publication history
Published online: January 30, 2012
Identification
Copyright
© 2012 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
