Journal of IMAB - Annual Proceeding (Scientific Papers)
Publisher: Peytchinski, Gospodin Iliev
ISSN: 1312 773X (Online)
Issue: 2014, vol. 20, issue 1
Subject Collection: Oral and Dental Medicine
Pages: 494-499
DOI: 10.5272/jimab.2014201.494
Published online: 16 June 2014

J of IMAB 2014 Jan-Jun;20(1):494-499
Emilia Karova Corresponding Autor, Snezhanka Topalova-Pirinska.
Department of Conservative Dentistry, Faculty of Dental Medicine, Medical University - Sofia, Bulgaria.

Purpose: Manufacturers have introduced instruments made with new alloys and with reciprocating motion trying to improve the fracture resistance of rotary NiTi files. The aim of this study was to compare instrument life of WaveOne and One Shape single-file techniques used for the instrumentation of artificial curved canals after a glide path creation.
Material/methods: Canal preparation was performed on 100 Endo-Training Block simulators divided in two equal groups, depending on the file used. Average lifespan and cumulative survival at the time of WaveOne files (Dentsply Maillefer) with reciprocating rotation and One Shape files (Micro Mega) with continuous rotation, after a glide path creation, were tested. All shaping instruments worked till fracture occurred. During mechanical instrumentation each file was coated with Glyde™ (Dentsply Maillefer) to act as a lubricant, and copious irrigation with 5.25% NaOCl was carried out.
Results: Twelve shaping files were used in canals’ preparation, after their initial enlargement, and ten of them broke: 2 WaveOne files and 8 One Shape files. The average lifespan of one WaveOne file was 17.50±2.12 canals and of one One Shape file–4.63±1.30 canals. The difference was statistically significant (p<0.001). The WaveOne instruments presented a significantly longer survival than the One Shape files (р<0.05).
Conclusions: Within the limits of this study, the WaveOne files showed significantly higher resistance to fracture compared with the One Shape files. Instrumentation with files with reciprocal motion increases significantly instruments life and makes them safer during shaping of  root canals.

Key words: Continuous rotation, Fracture, Nickel-titanium instruments, One Shape, Reciprocating motion, WaveOne,

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Please cite this article as:
Karova E, Topalova-Pirinska S. Instrument life of two rotary NiTi single-file techniques with reciprocating and continuous rotation used in curved canals after a glide path creation. J of IMAB. 2014 Jan-Jun;20(1):494-499. doi: 10.5272/jimab.2014201.494.

Correspondence to: Dr. Emilia Karova, Department of Conservative Dentistry, Faculty of Dental Medicine, Medical University - Sofia; 1, St. George Sofiiski Str., 1431 Sofia, Bulgaria; E-mail:

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Received: 06 April 2014
Published online: 16 June 2014

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