Abstract
Introduction
Hard-tissue debris is accumulated during rotary instrumentation. This study investigated
to what extent a calcium-complexing agent that has good short-term compatibility with
sodium hypochlorite (NaOCl) could reduce debris accumulation when applied in an all-in-one
irrigant during root canal instrumentation.
Methods
Sixty extracted mandibular molars with isthmuses in the mesial root canal system were
selected based on prescans using a micro–computed tomography system. Thirty teeth
each were randomly assigned to be instrumented with a rotary system and irrigated
with either 2.5% NaOCl or 2.5% NaOCl containing 9% (wt/vol) etidronic acid (HEBP).
Using a side-vented irrigating tip, 2 mL of irrigant was applied by 1 blinded investigator
to the mesial canals after each instrument. Five milliliters of irrigant was applied
per canal as the final rinse. Mesial root canal systems were scanned at high resolution
before and after treatment, and accumulated hard-tissue debris was calculated as vol%
of the original canal anatomy. Values between groups were compared using the Student's
t test (α < .05).
Results
Irrigation with 2.5% NaOCl resulted in 5.5 ± 3.6 vol% accumulated hard-tissue debris
compared with 3.8 ± 1.8 vol% when HEBP was contained in the irrigant (P < .05).
Conclusions
A hypochlorite-compatible chelator can reduce but not completely prevent hard-tissue
debris accumulation during rotary root canal instrumentation.
Key Words
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Article info
Publication history
Published online: January 24, 2012
Identification
Copyright
© 2012 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
