Effect of finishing instrumentation using NiTi hand files on volume, surface area and uninstrumented surfaces in C-shaped root canal systems

P. Amoroso-Silva, M. P. Alcalde, M. A. Hungaro Duarte, G. De-Deus, R. Ordinola-Zapata, L. G. Freire, B. C. Cavenago, I. G. De Moraes

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Aim: To assess the effect of 90°-oscillatory instrumentation with hand files on several morphological parameters (volume, surface area and uninstrumented surface) in C-shaped root canals after instrumentation using a single-file reciprocation system (Reciproc; VDW, Munich, Germany) and a Self-Adjusting File System (SAF; ReDent Nova, Ra'anana, Israel). Methodology: Twenty mandibular second molars with C-shaped canals and C1 canal configurations were divided into two groups (n = 10) and instrumented with Reciproc and SAF instruments. A size 30 NiTi hand K-file attached to a 90°-oscillatory motion handpiece was used as final instrumentation in both groups. The specimens were scanned using micro-computed tomography after all procedures. Volume, surface area increase and uninstrumented root canal surface were analysed using CTAn software (Bruker-microCT, Kontich, Belgium). Also, the uninstrumented root canal surface was calculated for each canal third. All values were compared between groups using the Mann–Whitney test and within groups using the Wilcoxon's signed-rank test. Results: Instrumentation with Reciproc significantly increased canal volume compared with instrumentation with SAF. Additionally, the canal volumes were significantly increased after 90°-oscillatory instrumentation (between and within group comparison; (P < 0.05)). Regarding the increase in surface area after all instrumentation protocols, statistical analysis only revealed significant differences in the within groups comparison (P < 0.05). Reciproc and SAF instrumentation yielded an uninstrumented root canal surface of 28% and 34%, respectively, which was not significantly different (P > 0.05). Final oscillatory instrumentation significantly reduced the uninstrumented root canal surface from 28% to 9% (Reciproc) and from 34% to 15% (SAF; P < 0.05). The apical and middle thirds exhibited larger uninstrumented root canal surfaces after the first instrumentation that was significantly reduced after oscillatory instrumentation (P < 0.05). Conclusions: The Reciproc and SAF system were associated with similar morphological parameters after instrumentation of mandibular second molars with C-shaped canals except for a higher canal volume increase in the Reciproc group compared to the SAF. Furthermore, the final use of 90°-oscillatory instrumentation using NiTi hand files significantly decreased the uninstrumented canal walls that remained after Reciproc and SAF instrumentation.

Original languageEnglish (US)
Pages (from-to)604-611
Number of pages8
JournalInternational Endodontic Journal
Volume50
Issue number6
DOIs
StatePublished - Jun 2017
Externally publishedYes

Bibliographical note

Funding Information:
The authors deny any conflict of interests related to this study. This work is supported by the Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo (FAPESP) grant (2014/03009-1).

Publisher Copyright:
© 2016 International Endodontic Journal. Published by John Wiley & Sons Ltd

Keywords

  • C-shaped root canal
  • Reciproc
  • Self-Adjusting File
  • micro-CT
  • nickel–titanium
  • root canal preparation

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