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International Journal of Dentistry
Volume 2012, Article ID 265695, 4 pages
Research Article

Taper Preparation Variability Compared to Current Taper Standards Using Computed Tomography

1Department of Endodontics, Faculty of Dentistry, Saint-Joseph University, P.O. Box 166255, Beirut, Lebanon
2Department of Prosthodontics, Faculty of Dentistry, Saint-Joseph University, P.O. Box 166255, Beirut, Lebanon

Received 26 November 2011; Accepted 24 December 2011

Academic Editor: Igor Tsesis

Copyright © 2012 Richard Gergi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. The purpose of this study was to compare the taper variation in root canal preparations among Twisted Files and PathFiles-ProTaper .08 tapered rotary files to current standards. Methods. 60 root canals with severe angle of curvature (between 25 and 35) and short radius (  mm) were selected. The canals were divided randomly into two groups of 30 each. After preparation with Twisted Files and PathFiles-ProTaper to size 25 taper .08, the diameter was measured using computed tomography (CT) at 1, 3, and 16 mm. Canal taper preparation was calculated at the apical third and at the middle-cervical third. Results. Of the 2 file systems, both fell within the ±.05 taper variability. All preparations demonstrated variability when compared to the nominal taper .08. In the apical third, mean taper was significantly different between TF and PathFiles-ProTaper ( value < 0.0001; independent -test). Mean Taper was significantly higher with PathFile-ProTaper. In the middle-cervical third, mean Taper was significantly higher with TF ( value = 0.015; independent -test). Conclusion. Taper preparations of the investigated size 25 taper .08 were favorable but different from the nominal taper.