Cyclic fatigue resistance of WaveOne Gold instrument with different amplitudes of axial movement: a dynamic study

Submitted: 3 April 2021
Accepted: 22 June 2021
Published: 3 December 2021
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Aim: Single-file reciprocating instruments were launched, aiming to diminish the risk of instrument separation. It operates in an in-and-out dynamic with an amplitude of approximately 3-4 mm. This study evaluated the impact of different amplitudes of axial movement in the dynamic cyclic fatigue resistance of the WaveOne Gold reciprocating file.

Materials and Methods: Forty-five WaveOne Gold 25.07 were divided into three different groups (n=15) according to the amplitude of axial movement of choice. In the G-2.5 group, the instruments were used in an in-and-out amplitude of 2.5 mm; in the G-5 group, the instruments were used in an in-and-out amplitude of 5.0 mm, and in the G-7.5 group, the instruments were used in an in-and-out amplitude of 7.5 mm. All instruments were tested in a simulated canal notched in metallic block, with 9.04 mm in its cervical portion, 13.3 mm in its apical portion, and curvature of 2.5 mm and 69°. The axial movement was applied with a back-and-forth speed of 2.5 mm/s during the dynamic cyclic fatigue test until the fracture was noticed. All of the tests were performed at a controlled temperature of 36 ± 1 °C and under oil lubrication. Then, the time to fracture (TTF/s), the number of cycles to fracture (NCF), and the length of the separated fragments were registered. The level of significance was set at 5%.

Results: The TTF/s was 11.40 ± 9.83, 15.00 ± 7.46 and 22.33 ± 8.76 for G-2.5, G-5, and G-7.5, respectively. The NCF was 57.00 ± 49.13, 75.00 ± 37.32, and 111.67 ± 43.82 for G-2.5, G-5, and G-7.5, respectively. For both TTF/s and NCF, G-7.5 was higher than G-2.5, and G-5.0 was similar to both groups (P< .05). The lengths of the fragments were 10.27 ± 1.07, 10.37 ± 0.66, and 10.58 ± 0.77 for G-2.5, G-5, and G-7.5, respectively. There was no difference among the groups in regards to the length of the fragments (P>.05). The SEM images showed characteristics related to cyclic fatigue.

Conclusions: It can be concluded that in-and-out movements affect the dynamic cyclic fatigue resistance of the WaveOne Gold reciprocating instrument. Appropriate pecking motions in the root canals are recommended to prevent the breakage of NiTi reciprocating instruments.

Walia HM, Brantley WA, Gerstein H. An initial investigation of the bending and torsional properties of Nitinol root canal files. J Endod 1988;14:346-51.

Peters OA. Current challenges and concepts in the preparation of root canal systems: a review. J Endod 2004;30:559-67.

Yared G. Canal preparation using only one Ni-Ti rotary instrument: preliminary observations. Int Endod J 2008;41:339-44.

Roane JB, Sabala CL, Duncanson MG, Jr. The "balanced force" concept for instrumentation of curved canals. J Endod 1985;11:203-11.

Gavini G, Caldeira CL, Akisue E, Candeiro GT, Kawakami DA. Resistance to flexural fatigue of Reciproc R25 files under continuous rotation and reciprocating movement. J Endod 2012;38:684-7.

Shen Y, Coil JM, Mo AJ, Wang Z, Hieawy A, Yang Y, et al. WaveOne Rotary Instruments after Clinical Use. J Endod 2016;42:186-9.

Plotino G, Grande NM, Porciani PF. Deformation and fracture incidence of Reciproc instruments: a clinical evaluation. Int Endod J 2015;48:199-205.

Madarati AA, Hunter MJ, Dummer PM. Management of intracanal separated instruments. J Endod 2013;39:569-81.

Ozyurek T. Cyclic Fatigue Resistance of Reciproc, WaveOne, and WaveOne Gold Nickel-Titanium Instruments. J Endod 2016;42:1536-9.

Li UM, Lee BS, Shih CT, Lan WH, Lin CP. Cyclic fatigue of endodontic nickel titanium rotary instruments: static and dynamic tests. J Endod 2002;28:448-51.

de Hemptinne F, Slaus G, Vandendael M, Jacquet W, De Moor RJ, Bottenberg P. In Vivo Intracanal Temperature Evolution during Endodontic Treatment after the Injection of Room Temperature or Preheated Sodium Hypochlorite. J Endod 2015;41:1112-5.

Hulsmann M, Donnermeyer D, Schafer E. A critical appraisal of studies on cyclic fatigue resistance of engine-driven endodontic instruments. Int Endod J 2019;52:1427-45.

Kim HC, Kwak SW, Cheung GS, Ko DH, Chung SM, Lee W. Cyclic fatigue and torsional resistance of two new nickel-titanium instruments used in reciprocation motion: Reciproc versus WaveOne. J Endod 2012;38:541-4.

Franco V, Fabiani C, Taschieri S, Malentacca A, Bortolin M, Del Fabbro M. Investigation on the shaping ability of nickel-titanium files when used with a reciprocating motion. J Endod 2011;37:1398-401.

Schneider SW. A comparison of canal preparations in straight and curved root canals. Oral Surg Oral Med Oral Pathol 1971;32:271-5.

Terauchi Y, O'Leary L, Kikuchi I, Asanagi M, Yoshioka T, Kobayashi C, et al. Evaluation of the efficiency of a new file removal system in comparison with two conventional systems. J Endod 2007;33:585-8.

Constante IG, Davidowicz H, Barletta FB, Moura AA. Location and angulation of curvatures of mesiobucal canals of mandibular molars debrided by three endodontic techniques. Braz Oral Res 2007;21:22-8.

Sobotkiewicz T, Huang X, Haapasalo M, Mobuchon C, Hieawy A, Hu J, et al. Effect of canal curvature location on the cyclic fatigue resistance of reciprocating files. Clin Oral Investig 2020.

Jamleh A, Alghaihab A, Alfadley A, Alfawaz H, Alqedairi A, Alfouzan K. Cyclic Fatigue and Torsional Failure of EdgeTaper Platinum Endodontic Files at Simulated Body Temperature. J Endod 2019;45:611-4.

Ha JH, Kwak SW, Sigurdsson A, Chang SW, Kim SK, Kim HC. Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth. J Endod 2017;43:1688-91.

De-Deus G, Moreira EJ, Lopes HP, Elias CN. Extended cyclic fatigue life of F2 ProTaper instruments used in reciprocating movement. Int Endod J 2010;43:1063-8.

Alcalde MP, Duarte MAH, Bramante CM, de Vasconselos BC, Tanomaru-Filho M, Guerreiro-Tanomaru JM, et al. Cyclic fatigue and torsional strength of three different thermally treated reciprocating nickel-titanium instruments. Clin Oral Investig 2018;22:1865-71.

Kaval ME, Capar ID, Ertas H. Evaluation of the Cyclic Fatigue and Torsional Resistance of Novel Nickel-Titanium Rotary Files with Various Alloy Properties. J Endod 2016;42:1840-3.

Alves, V., Carvalho, R., Silva, R., Soares, A. de J., & Frozoni, M. (2021). Cyclic fatigue resistance of WaveOne Gold instrument with different amplitudes of axial movement: a dynamic study. Giornale Italiano Di Endodonzia, 36(1).


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