J Dent Res Dent Clin Dent Prospects. 2017;11(2):90-95.
doi: 10.15171/joddd.2017.017
PMID: 28748049
PMCID: PMC5519999
  Abstract View: 538
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Basic Research

Effect of different nickel-titanium rotary files on dentinal crack formation during retreatment procedure

Mehmet Çitak 1, Taha Özyürek 2 *

1 Department of Endodontics, Faculty of Dentistry, Ordu University, Ordu, Turkey
2 Department of Endodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey

Article

Background. The aim of this study was to compare the dentinal defects caused by Reciproc, TF Adaptive and ProTaper Next NiTi rotary file systems during the retreatment procedure. Methods. A total of 150 mandibular incisors with straight and single root canals were included in the present study. All the root canals were prepared up to an apical diameter 0.40 mm using stainless steel files. Thirty teeth were randomly stored as the negative control group. A total of 120 specimens were obturated with gutta-percha and AH Plus sealer using vertical compaction technique. Thirty specimens with root canal filling were randomly separated for the only-filled group. Then the teeth were randomly divided into 3 groups; Reciproc, TF Adaptive and ProTaper Next. The retreatment procedure was performed with these NiTi files. Then 150 specimens were cut perpendicular to tooth axis at 3-, 6-, and 9-mm distances from the apex, and examined to determine the presence of any cracks at ×25 under a stereomicroscope. Chi-squared test was used at 5% significance level. Results. All the tested NiTi file systems were found to cause significantly more dentinal defects compared to unprepared and only-filled groups (P<0.05). No statistically significant differences were found between the groups in terms of dentinal defects (P>0.05). No correlation was found between the slice levels and the dentinal defect distribution (P>0.05). Conclusion. Within the limitations of present study, all the tested NiTi file systems were found to cause significantly more dentinal defects compared to unprepared and only-filled groups.
© 2017 Çitak and Özyürek This is an Open Access article published and distributed by Tabriz University of Medical Sciences under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Submitted: 01 Jul 2015
Accepted: 06 Nov 2016
First published online: 21 Jun 2017
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