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01-09-2018 | Original Article

Cyclic fatigue using severely curved canals and torsional resistance of thermally treated reciprocating instruments

Authors: Emmanuel João Nogueira Leal Silva, Victor Talarico Leal Vieira, Fernanda Hecksher, Marja Ribeiro Silva dos Santos Oliveira, Henrique dos Santos Antunes, Edson Jorge Lima Moreira

Published in: Clinical Oral Investigations | Issue 7/2018

Abstract

Objectives

To evaluate the cyclic fatigue using severely curved canals and torsional resistance of ProDesign R (Easy Equipamentos Odontológicos, Belo Horizonte, MG, Brazil), Reciproc Blue (VDW, Munich, Germany), and WaveOne Gold (Dentsply Maillefer, Ballaigues, Switzerland) reciprocating instruments

Materials and methods

Twenty instruments of the ProDesign R (25/0.06) system, 20 instruments of the Reciproc Blue (25/0.08v) system, and 20 instrument of the WaveOne Gold (25/0.07v) system were used. Cyclic fatigue resistance was tested measuring the time to fracture and the number of cycles to fracture in an artificial stainless steel severely curved canal with 80° angle and a 3-mm radius of curvature (n = 10). Torque and angle of rotation at failure of new instruments (n = 10) were measured according to ISO 3630-1. The fracture surfaces of all fragments were examined with a scanning electron microscope. Results were statistically analyzed using one-way ANOVA and Tukey’s test at a significance level of p < 0.05.

Results

ProDesign R instruments showed a significantly longer cyclic fatigue life than the other tested instruments (p < 0.05). Reciproc Blue showed longer cyclic life than WaveOne Gold (p < 0.05). Reciproc Blue showed the higher torsional strength, followed by WaveOne Gold and ProDesign R instruments (p < 0.05). Moreover, Reciproc Blue showed significantly higher angular rotation to fracture than ProDesign R (p < 0.05). WaveOne Gold showed intermediary results regarding angular rotation to fracture with no differences when compared to Reciproc Blue or ProDesign R instruments (p < 0.05).

Conclusions

ProDesign R presented the highest cyclic fatigue resistance in severely curved canals when compared with Reciproc Blue and WaveOne Gold. However, Reciproc Blue showed the higher torsional strength overall and higher angular rotation to fracture when compared to ProDesign R.

Clinical relevance

Despite the numerous advantages of reciprocating instruments, these instruments still have some risk of fracture during its use, especially in severely curved canals. The present study evaluated the cyclic fatigue and torsional resistance of thermally treated reciprocating instruments.

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Title: Cyclic fatigue using severely curved canals and torsional resistance of thermally treated reciprocating instruments
Authors: Emmanuel João Nogueira Leal Silva
Victor Talarico Leal Vieira
Fernanda Hecksher
Marja Ribeiro Silva dos Santos Oliveira
Henrique dos Santos Antunes
Edson Jorge Lima Moreira
Publication date: 01-09-2018
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 7/2018
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-018-2362-9

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Springer Medicine

Cyclic fatigue using severely curved canals and torsional resistance of thermally treated reciprocating instruments

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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