Cyclic Fatigue Resistance of Mtwo Rotary Instruments with Two Different Instrumentation Techniques

Overview

Journal Iran Endod J

Date 2018 Apr 26

PMID 29692846

Citations 7

Authors

Silvio Emanuel Acioly Conrado de Menezes

Shirley Machado Batista

Diego Felipe Brandao de Magalhaes

de Albuquerque Diana Santana

Gabriela Queiroz de Melo Monteiro

Affiliations

Soon will be listed here.

Abstract

Introduction: The objective of this study was to evaluate whether cervical preparation with Mtwo files in a crown-down technique influences instrumentation time and the cyclic fatigue resistance of these instruments.

Methods And Materials: Two instrumentation techniques were evaluated (manufacturer and crown-down). Each group consisted of 10 kits containing four Mtwo instruments (10/0.04, 15/0.05, 20/0.06, and 25/0.06), which were used to prepare three standard simulated curved resin canals. The mean instrumentation time and the corresponding number of cycles for each instrumentation (NCI) were recorded. The instruments were rotated at a constant speed of 300 rpm in a stainless-steel canal (diameter of 1.5 mm) at a 90 angle of curvature and 5-mm radius. The center of the curvature was 5 mm from the tip of the instrument. The cyclic fatigue resistance of the files was determined by counting the number of cycles to failure (NCF). Data were analyzed by the Mann-Whitney test.

Results: The mean instrumentation time and NCI of files 10/0.04 and 15/0.05 were significantly lower (<0.05) when the crown-down technique was used compared to the manufacturer's method for the same tip size/taper file. There was no significant difference in the mean NCF between the two techniques.

Conclusion: The crown-down technique did not interfere with resistance to cyclic fatigue. However, the shorter instrumentation time of files 10/0.04 and 15/0.05 could reduce the fracture risk in the case of reuse of these instruments.

Citing Articles

The Intra-Manufacture Diameter Variability of Rotary Files and Their Corresponding Gutta-Percha Cones Using Laser Scan Micrometer.

Mirmohammadi H, Sitarz M, Shemesh H Iran Endod J. 2023; 13(4):453-456.

PMID: 36883035 PMC: 9985685. DOI: 10.22037/iej.v13i4.18937.

Anatomic Two-dimensional and Three-dimensional Models for Cyclic Fatigue Testing of Endodontic Instruments.

Piasecki L, Makowka S, Gambarini G Iran Endod J. 2023; 15(2):100-105.

PMID: 36704437 PMC: 9709840. DOI: 10.22037/iej.v15i2.27342.

Influence of Rotation Speed of Mtwo Files on Root Canal Instrumentation Time with Different Canal Curvatures.

Carlesi T, Plotino G, Colangeli M, Pappalardo A, Malagnino V Iran Endod J. 2023; 16(1):38-42.

PMID: 36704413 PMC: 9709877. DOI: 10.22037/iej.v16i1.24773.

Cyclic and Torsional Fatigue Resistance of Seven Rotary Systems.

Furlan R, Alcalde M, Duarte M, Bramante C, Piasecki L, Vivan R Iran Endod J. 2023; 16(2):78-84.

PMID: 36704225 PMC: 9709893. DOI: 10.22037/iej.v16i2.23760.

Influence of Heat Treatment of Nickel-Titanium Instruments on Cyclic Fatigue Resistance in Simulated Curved Canals.

Campos G, Fontana C, Vieira V, Elias C, Martin A, Bueno C Eur J Dent. 2022; 17(2):472-477.

PMID: 36195211 PMC: 10329553. DOI: 10.1055/s-0042-1747952.

References

Plotino G, Grande N, Sorci E, Malagnino V, Somma F . A comparison of cyclic fatigue between used and new Mtwo Ni-Ti rotary instruments. Int Endod J. 2006; 39(9):716-23. DOI: 10.1111/j.1365-2591.2006.01142.x. View

Emanuel Acioly Conrado de Menezes S, Batista S, Lira J, de Melo Monteiro G . Cyclic Fatigue Resistance of WaveOne Gold, ProDesign R and ProDesign Logic Files in Curved Canals In Vitro. Iran Endod J. 2017; 12(4):468-473. PMC: 5722121. DOI: 10.22037/iej.v12i4.17494. View

Gambarini G, Grande N, Plotino G, Somma F, Garala M, De Luca M . Fatigue resistance of engine-driven rotary nickel-titanium instruments produced by new manufacturing methods. J Endod. 2008; 34(8):1003-5. DOI: 10.1016/j.joen.2008.05.007. View

Uroz-Torres D, Gonzalez-Rodriguez M, Ferrer-Luque C . Effectiveness of a manual glide path on the preparation of curved root canals by using Mtwo rotary instruments. J Endod. 2009; 35(5):699-702. DOI: 10.1016/j.joen.2009.02.001. View

Plotino G, Costanzo A, Grande N, Petrovic R, Testarelli L, Gambarini G . Experimental evaluation on the influence of autoclave sterilization on the cyclic fatigue of new nickel-titanium rotary instruments. J Endod. 2012; 38(2):222-5. DOI: 10.1016/j.joen.2011.10.017. View

Lopes H, Ferreira A, Elias C, Moreira E, Oliveira J, Siqueira Jr J . Influence of rotational speed on the cyclic fatigue of rotary nickel-titanium endodontic instruments. J Endod. 2009; 35(7):1013-6. DOI: 10.1016/j.joen.2009.04.003. View

Pedulla E, Lo Savio F, Boninelli S, Plotino G, Grande N, Rapisarda E . Influence of cyclic torsional preloading on cyclic fatigue resistance of nickel - titanium instruments. Int Endod J. 2014; 48(11):1043-50. DOI: 10.1111/iej.12400. View

Gambarini G, Plotino G, Grande N, Al-Sudani D, De Luca M, Testarelli L . Mechanical properties of nickel-titanium rotary instruments produced with a new manufacturing technique. Int Endod J. 2011; 44(4):337-41. DOI: 10.1111/j.1365-2591.2010.01835.x. View

Schafer E, Erler M, Dammaschke T . Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth. Int Endod J. 2006; 39(3):203-12. DOI: 10.1111/j.1365-2591.2006.01075.x. View

10.

Barbosa F, Gomes J, Araujo M . Influence of previous angular deformation on flexural fatigue resistance of K3 nickel-titanium rotary instruments. J Endod. 2007; 33(12):1477-80. DOI: 10.1016/j.joen.2007.08.014. View

11.

Arens F, Hoen M, Steiman H, Dietz Jr G . Evaluation of single-use rotary nickel-titanium instruments. J Endod. 2003; 29(10):664-6. DOI: 10.1097/00004770-200310000-00013. View

12.

Kramkowski T, Bahcall J . An in vitro comparison of torsional stress and cyclic fatigue resistance of ProFile GT and ProFile GT Series X rotary nickel-titanium files. J Endod. 2009; 35(3):404-7. DOI: 10.1016/j.joen.2008.12.003. View

13.

Bui T, Mitchell J, Baumgartner J . Effect of electropolishing ProFile nickel-titanium rotary instruments on cyclic fatigue resistance, torsional resistance, and cutting efficiency. J Endod. 2008; 34(2):190-3. DOI: 10.1016/j.joen.2007.10.007. View

14.

Lopes H, Elias C, Vieira M, Siqueira Jr J, Mangelli M, Lopes W . Fatigue Life of Reciproc and Mtwo instruments subjected to static and dynamic tests. J Endod. 2013; 39(5):693-6. DOI: 10.1016/j.joen.2012.11.048. View

15.

Dagna A, Poggio C, Beltrami R, Colombo M, Chiesa M, Bianchi S . Cyclic fatigue resistance of OneShape, Reciproc, and WaveOne: An in vitro comparative study. J Conserv Dent. 2014; 17(3):250-4. PMC: 4056397. DOI: 10.4103/0972-0707.131788. View

16.

Inan U, Gonulol N . Deformation and fracture of Mtwo rotary nickel-titanium instruments after clinical use. J Endod. 2009; 35(10):1396-9. DOI: 10.1016/j.joen.2009.06.014. View

17.

Pedulla E, Plotino G, Grande N, Scibilia M, Pappalardo A, Malagnino V . Influence of rotational speed on the cyclic fatigue of Mtwo instruments. Int Endod J. 2013; 47(6):514-9. DOI: 10.1111/iej.12178. View

18.

He R, Ni J . Design improvement and failure reduction of endodontic files through finite element analysis: application to V-Taper file designs. J Endod. 2010; 36(9):1552-7. DOI: 10.1016/j.joen.2010.06.002. View

19.

Plotino G, Grande N, Cordaro M, Testarelli L, Gambarini G . A review of cyclic fatigue testing of nickel-titanium rotary instruments. J Endod. 2009; 35(11):1469-76. DOI: 10.1016/j.joen.2009.06.015. View

20.

Pruett J, Clement D, Carnes Jr D . Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod. 1997; 23(2):77-85. DOI: 10.1016/S0099-2399(97)80250-6. View