Accessibility Tools

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. Duarte, G. de Deus, R. Ordinola-Zapata, L.G. Freire, B.C. Cavenago, I.G. de Morales

International Endodontic Journal. 2017; 50(6):604-611.


AIM: To assess the effect of 90º-oscillatory instrumentation with hand files on the following 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 90º-oscillatory motion handpiece was used as a 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. Aditionally the canal volumes were significantly increased after 90º-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 90º-oscillatory instrumentation using NiTi hand files significantly decreased the uninstrumented canal walls that remained after Reciproc and SAF instrumentation. This article is protected by copyright. All rights reserved.


The full text of the article: Researchgate

Amoroso Silva shaping IEJ 


View abstract on PubMed. PMID: 27194509
Sign up to get the latest news
Subscribe To Our Newsletter
Invalid Input

ReDent Nova GmbH & Co. Kg.

Am Borsigturm 70
13507 Berlin, Germany