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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Oral Health 1/2015

Influence of cervical preflaring on apical transportation in curved root canals instrumented by reciprocating file systems

BMC Oral Health > Ausgabe 1/2015
Neisiana Barbieri, Denise Piotto Leonardi, Marina Samara Baechtold, Gisele Maria Correr, Marilisa Carneiro Leão Gabardo, João César Zielak, Flares Baratto-Filho
Wichtige Hinweise

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

NB performed the root canal preparation and the data analysis. DPL designed the article, supervised the experiment and helped to draft the article. MSB performed the literature research. GMC performed the data analysis. MCLG performed the selection of the teeth and the literature research. JCZ helped to draft the article. FBF designed the article and revised the final version of the text. All authors read and approved the final manuscript.



The aim of this study was to evaluate the influence of cervical preflaring on apical transportation in curved root canals prepared using the Reciproc and WaveOne reciprocating file systems.


Sixty curved canals were instrumented using Reciproc R25 and WaveOne Primary files, with and without preflaring (n = 15). A double-digital technique was used to digitally superimpose the file before instrumentation (#15 K-file) on the final apical reciprocating file (#25/08). The angle between the tip of the initial and final file was measured and recorded. Groups were compared using the Kruskal–Wallis test, and significance was set at p < 0.05.


The mean and standard deviation for apical transportation was 0.93 ± 2.48 for the Reciproc Group, 0.84 ± 1.94 for the Preflaring + Reciproc Group, 0.40 ± 1.14 for the WaveOne Group, and 0.83 ± 2.20 for the Preflaring + WaveOne Group. No statistically significant differences were found among the groups (p = 0.9509).


Under the conditions of this study, cervical preflaring did not influence apical transportation in curved root canals instrumented using Reciproc R25 and the WaveOne Primary files. Based on the in vitro measurements of apical transportation, the reciprocating files may be used without preflaring in curved root canals.
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