Abstract
The purpose of this prospective, randomized, single-blind study was to compare the
in vivo antibacterial efficacy of a hand/rotary technique versus a hand/rotary/ultrasound
technique in mesial root canals of necrotic mandibular molars. The hand/rotary group
consisted of 16 mesial roots prepared with a hand/rotary technique. The hand/rotary/ultrasound
group consisted of 15 mesial roots prepared similarly, followed by 1 minute of ultrasonic
irrigation per canal with an ultrasonic needle in a MiniEndo unit and 15 mL/canal
of 6.0% sodium hypochlorite. Canals were sampled before and after instrumentation
and after 1 minute of ultrasonic irrigation. Samples were incubated anaerobically
on reduced blood agar for 7 days at 37°C, and colony-forming units (CFUs) were counted.
The addition of 1 minute of ultrasonic irrigation resulted in significant (p = .0006)
reduction in CFU count and positive cultures (p = .0047). Logistic regression analysis
indicated the addition of ultrasonic irrigation was 7 times more likely to yield a
negative culture.
Key Words
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Article info
Publication history
Published online: July 19, 2007
Identification
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© 2007 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
