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Lifespan of One Nickel-Titanium Rotary File with Reciprocating Motion in Curved Root Canals

Cited 92 time in Web of Science Cited 107 time in Scopus
Authors
You, Sung-Yeop; Bae, Kwang-Shik; Baek, Seung-Ho; Kum, Kee-Yeon; Lee, WooCheol; Shon, Won-Jun
Issue Date
2010-12
Publisher
ELSEVIER SCIENCE INC
Citation
JOURNAL OF ENDODONTICS; Vol.36. No.12, pp.1991-1994
Keywords
Curved root canalreciprocating motionnickel-titanium filefile fracturelifespan
Abstract
Introduction: The purpose of this study was to examine the lifespan of one nickel-titanium (NiTi) rotary file when used in reciprocating motion and to compare the time required for its preparation of a curved root canal using both reciprocating and continuous motion. Methods: One hundred twenty curved canals from 60 extracted maxillary and mandibular molars were selected for measuring the mean number of uses. Each canal was prepared with reciprocating motion until the Pro Taper F2 single file (Dentsply Maillefer, Ballaigues, Switzerland) reached the working length. One file was used until it was fractured. Another 60 canals were divided into two groups. 30 canals in the continuous rotation motion (CM) group were prepared using continuous rotation following the sequence of Pro Taper files, whereas the canals in the reciprocating motion (RM) group (n = 30) were prepared with reciprocating motion with the sole use of the Pro Taper F2. The total root canal preparation time was measured until the F2 file finally reached the working length in both groups. Results: A total of 11 files were used in the preparation of 120 curved root canals. The average lifespan of one F2 file was 10.60 +/- 4.35 canals with the longest lifespan of 21 canals. The total time for canal preparation was 46.42 +/- 18.12 seconds and 21.15 +/- 6.70 seconds in the CM and RM groups, respectively. There was a statistically significant difference between the groups (p < 0.01). Conclusion: Within the limitation of this study, one F2 file can be safely used to the working length of curved canals at least six times under reciprocating motion. Reciprocating preparation with only one F2 file was much faster than root canal instrumentation with continuous rotation. (J Endod 2010;36:1991-1994)
ISSN
0099-2399
Language
English
URI
http://hdl.handle.net/10371/80425
DOI
https://doi.org/10.1016/j.joen.2010.08.040
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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