title: Bacteriological comparison of ultrasonic and hand instrumentation of root canals in dogs.
abstract: This study compared the effectiveness of hand and ultrasonic instrumentation for removing a standardized inoculum of pigmented Serratia marcescens from the root canal system of premolars in dogs. Forty-four premolars from nine beagle dogs were divided into two experimental groups of 20 and 24 teeth, respectively. The experimental teeth were inoculated with approximately 10 colony-forming units of S. marcescens. After the bacterial were allowed to colonize for 1 wk, the experimental teeth were instrumented with either hand instruments or the Cavi-Endo device. The teeth were extracted, crushed, and assayed for recoverable colony-forming units of S. marcescens. Statistical comparisons of the ratio of inoculated to recovered colony-forming untis were made. The results indicated that the difference between the positive controls and the experimental groups was significant. There was no significant difference between the two instrumentation groups.
authors.forename: M S
authors.initials: MS
authors.lastname: DeNunzio
authors.forename: M L
authors.initials: ML
authors.lastname: Hicks
authors.forename: G B
authors.initials: GB
authors.lastname: Pelleu
authors.forename: A
authors.initials: A
authors.lastname: Kingman
authors.forename: J J
authors.initials: JJ
authors.lastname: Sauber
mesh_terms: D000818:Animals; D003786:Dental Pulp Cavity / Q000382:microbiology*; D004285:Dogs; D012390:Root Canal Therapy / Q000295:instrumentation / Q000379:methods*; D014464:Ultrasonic Therapy / Q000295:instrumentation*