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Clinical Oral Investigations

Erschienen in:

30.09.2015 | Original Article

Cyclic fatigue resistance of D-RaCe, ProTaper, and Mtwo nickel–titanium retreatment instruments after immersion in sodium hypochlorite

verfasst von: Hüseyin Sinan Topçuoğlu, Kanşad Pala, Ahmet Aktı, Salih Düzgün, Gamze Topçuoğlu

Erschienen in: Clinical Oral Investigations | Ausgabe 6/2016

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Abstract

Objectives

The aim of this study was to investigate the effect of immersion in sodium hypochlorite (NaOCl) on cyclic fatigue resistance of three different rotary nickel–titanium (NiTi) retreatment files.

Material and methods

A total of 90 new ProTaper, D-RaCe, and Mtwo retreatment files were tested. Thirty files of the same brand were randomly assigned to two groups (n = 15). Group 1 was no immersion (control group) and 16 mm of group 2 instruments were immersed in 5 % NaOCl at 37 °C for 5 min. All instruments were then tested for cyclic fatigue. Resistance to cyclic fatigue was determined by counting the numbers of cycles to failure in a 60° curve with a 5-mm radius, recording the time in seconds to fracture. Data were analyzed by two-way analysis of variance.

Results

Resistance to cyclic fatigue decreased significantly for D-RaCe retreatment files after immersion in NaOCl. ProTaper and Mtwo retreatment files were not affected from immersion to NaOCl. D-RaCe retreatment instruments showed better cyclic fatigue resistance than ProTaper and Mtwo retreatment instruments, and the difference was statistically significant (p < 0.05). There was no significant difference between ProTaper and Mtwo retreatment instrument groups (p > 0.05).

Conclusions

D-RaCe retreatment instruments had the highest cyclic fatigue resistance among retreatment files tested in this study, but immersion to NaOCl decreased the cyclic fatigue resistance of D-RaCe retreatment instrument.

Clinical relevance

It should be considered that cyclic fatigue resistance of D-RaCe can decrease in contact with NaOCl during the removal of canal filling material.

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Titel: Cyclic fatigue resistance of D-RaCe, ProTaper, and Mtwo nickel–titanium retreatment instruments after immersion in sodium hypochlorite
verfasst von: Hüseyin Sinan Topçuoğlu
Kanşad Pala
Ahmet Aktı
Salih Düzgün
Gamze Topçuoğlu
Publikationsdatum: 30.09.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Oral Investigations / Ausgabe 6/2016
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-015-1611-4

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Cyclic fatigue resistance of D-RaCe, ProTaper, and Mtwo nickel–titanium retreatment instruments after immersion in sodium hypochlorite

Abstract

Objectives

Material and methods

Results

Conclusions

Clinical relevance

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Abstract

Objectives

Material and methods

Results

Conclusions

Clinical relevance

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