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CC BY 4.0 · Eur J Dent 2022; 16(03): 580-584
DOI: 10.1055/s-0041-1735934
Original Article

Influence of Sodium Hypochlorite and Chlorhexidine on the Dynamic Cyclic Fatigue Resistance of XP Endo Shaper Instruments

Alexandra Aparecida Tanomaru
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Ana Grasiela Limoeiro
2   Department of Endodontics, Ilhéus School of Dentistry, Ilhéus, Bahia, Brazil
,
Adriana de Jesus Soares
3   Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas- UNICAMP, Piracicaba, São Paulo, Brazil
,
Elson Lopes Medeiros Junior
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Gabriel Rocha Campos
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Sílvia Kaoru Hamasaki
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Wayne Martins Nascimento
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Luiz Meton Horta
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Paula Avelar da Silva Ribeiro Goulart
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Viviane Rangel do Couto
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Patrícia Bastos Alves
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Verônica Magalhães
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Danilo De Luca Campos
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
,
Marcos Frozoni
1   Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
› Author Affiliations Funding None.
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Abstract

Objective This study evaluated the dynamic cyclic fatigue resistance of the XP-Endo Shaper (XPS), associated with chlorhexidine digluconate (CHX) or sodium hypochlorite (NaOCl) in two different formulations: gel (G) or liquid (L).

Materials and Methods Sixty XPS were used in an artificial stainless-steel canal, and the files were fully immersed in the irrigating solution throughout the experiment until the fracture. The files were divided into six groups (n = 10) based on the irrigation solution used: NaOCl(L), NaOCl(G), CHX(L), CHX(G), natrosol gel (NAT) (control), and lubricating oil (LO) (control). The artificial canal was manufactured 1.5 mm wide, 20 mm long, and, 3.5 mm deep with a straight cervical segment measuring 14.29 mm; an apical segment of 4.71 mm with 3 mm radius; and 90 degrees of curvature apical 1 mm long straight segment. Resistance to cyclic fatigue was determined by recording the number of cycles to fracture (NCF).

Results The CHX(G), CHX(L), and OIL (LO) groups showed no significant difference between them and presented longer time to fracture (p > 0.05). NaOCl(L) shows the lowest NCF without significant differences between NaOCl(G) and NAT. The NCF of the NaOCl(G) was statistically similar to the CHX(L) and statistically lower than the CHX(G) and OIL groups. NAT did not present a statistical difference of the NaOCl(L), NaOCl(G), and presented a significantly lower NCF than the CHX(G) (p < 0.01).

Conclusion The use of CHX(G) resulted in increased cyclic fatigue resistance of the XPS instruments compared to NaOCl or LO.

Keywords

chlorhexidine digluconate - irrigation solutions - sodium hypochlorite - XP-Endo Shaper


Publication History

Article published online:
22 December 2021

© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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