Effect of three nickel-titanium rotary file techniques on infected root dentin reduction

This study compared the bacterial reduction of in vitro infected root canals after instrumentation by 3 nickel-titanium (NiTi) rotary files with different taper and diameter versus manual stainless steel files. Sixty-four single-rooted human teeth were infected with a suspension of Streptococcus san...

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Published in:Oral surgery, oral medicine, oral pathology, oral radiology and endodontics oral medicine, oral pathology, oral radiology and endodontics, 2006-08, Vol.102 (2), p.254-258
Main Authors: Chuste-Guillot, Marie-Pierre, Badet, Cécile, Peli, Jean-François, Perez, Fabienne
Format: Article
Language:English
Subjects:
Analysis of Variance
Biological and medical sciences
Dental Alloys
Dental Instruments
Dental Pulp Cavity - microbiology
Dentin - microbiology
Dentistry
Equipment Design
Humans
Medical sciences
Nickel
Otorhinolaryngology. Stomatology
Root Canal Irrigants
Root Canal Preparation - instrumentation
Sodium Hypochlorite
Stainless Steel
Streptococcal Infections
Streptococcus sanguis
Titanium
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Summary:This study compared the bacterial reduction of in vitro infected root canals after instrumentation by 3 nickel-titanium (NiTi) rotary files with different taper and diameter versus manual stainless steel files. Sixty-four single-rooted human teeth were infected with a suspension of Streptococcus sanguis measured by optical density. Teeth were divided randomly into 4 groups of 16 and prepared with Flexofiles, GT rotary files, HERO 642, and ProFile. Bacterial samplings were performed before (S1), during (S2-S3), and after (S4) instrumentation. All techniques significantly reduced the number of bacterial cells in the root canals ( P < .05). There was no significant difference between NiTi and manual instrumentation at S2, S3, or S4. Concerning bacterial reduction, the results suggest that a manual stainless steel file preparation is as efficient as a NiTi rotary instrumentation. Regardless of the root canal preparation technique, its taper, and diameter, the root dentin remained infected and was not bacteria-free at the end of the experiment.
ISSN:1079-2104
1528-395X
DOI:10.1016/j.tripleo.2005.09.013