Restorative Dentistry & Endodontics

Research Article

Influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium instruments: a systematic review: Emmanuel João Nogueira Leal Silva, Mayara Zanon, Fernanda Hecksher, Felipe Gonçalves Belladonna, Rafaela Andrade de Vasconcelos, Tatiana Kelly da Silva Fidalgo; Restor Dent Endod 2020;45(2):e25. Published online March 31, 2020; DOI: https://doi.org/10.5395/rde.2020.45.e25

Objectives

This systematic review evaluated the influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium (NiTi) instruments.

Materials and Methods

A systematic search without restrictions was conducted in the following electronic databases: PubMed, Scopus, Web of Science, ScienceDirect, Cochrane, and Open Grey. The hand search was also performed in the main endodontic journals. The eligible studies were submitted to the methodological assessment and data extraction.

Results

From 203 abstracts, a total of 10 articles matched the eligible criteria. After reading the full articles, 2 were excluded because of the absence of the heat-treated instruments in the experimental design and 3 due to the lack of a control group using heat-treated instruments without autoclave sterilization. From the 5 included studies, 1 presented a low risk of bias, 3 presented moderate and 1 high risk. It was observed heterogeneous findings in the included studies, with autoclave sterilization cycles increasing, decreasing or not affecting the cyclic fatigue life of heat-treated NiTi instruments. However, the retrieved studies evaluating the cyclic fatigue resistance of endodontic instruments presented different protocols and assessing outcomes, this variability makes the findings less comparable within and also between groups and preclude the establishment of an unbiased scientific evidence base.

Conclusions

Considering the little scientific evidence and considerable risk of bias, it is still possible to conclude that autoclave sterilization procedures appear to influence the cyclic fatigue resistance of heat-treated NiTi instruments.

Citations

Citations to this article as recorded by

Effect of simulated clinical use and sterilization on the cyclic fatigue resistance of nickel titanium files
Mohammad Alajemi, Ammar AbuMostafa
PeerJ.2024; 12: e17418. CrossRef
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Dina Abdellatif, Alfredo Iandolo, Michela Scorziello, Giuseppe Sangiovanni, Massimo Pisano
Bioengineering.2024; 11(5): 499. CrossRef
Cyclic Fatigue Resistance of Rotary versus Reciprocating Endodontic Files: A Systematic Review and Meta-Analysis
Ana De Pedro-Muñoz, Cristina Rico-Romano, Patricia Sánchez-Llobet, José María Montiel-Company, Jesús Mena-Álvarez
Journal of Clinical Medicine.2024; 13(3): 882. CrossRef
Influence of sodium hypochlorite on cyclic fatigue resistance of nickel–titanium instruments: A systematic review and meta-analysis of in vitro studies
Alexandre Henrique dos Reis-Prado, Lucas Guimarães Abreu, Lara Cancella de Arantes, Kiani dos Santos de Paula, Sabrina de Castro Oliveira, Juliana Goto, Ana Cecília Diniz Viana, Francine Benetti
Clinical Oral Investigations.2023; 27(11): 6291. CrossRef
Cyclic fatigue resistance of EdgeTaper Platinum, Protaper Gold, and TruNatomy Prime rotary files before and after autoclave sterilization
Rahaf A. Almohareb, Reem M. Barakat, Fahda N. Algahtani, Manal F. Alkadi
PeerJ.2023; 11: e14656. CrossRef
Effect of calcium hydroxide on fracture resistance and microhardness of dentin in human teeth
Simar Sethi, Alpa Gupta, Ansy Hanna Kurian, Dax Abraham, Parul Chauhan, Kritika Aneja, Sucheta Jala, Arundeep Singh
Endodontology.2022; 34(4): 223. CrossRef
Effect of body temperature on the cyclic fatigue resistance of the nickel”titanium endodontic instruments: A systematic review and meta-analysis of in vitro studies
Selventhra Savitha, Sidhartha Sharma, Vijay Kumar, Amrita Chawla, Perumal Vanamail, Ajay Logani
Journal of Conservative Dentistry.2022; 25(4): 338. CrossRef
Fracture Resistance of Heat-Treated Nickel-Titanium Rotary Files After Usage and Autoclave Sterilization: An In Vitro Study
Rashid El Abed, Aisha Alshehhi, Yoo Jung Kang, Dana Al Raeesi, Amar H. Khamis, Mohamed Jamal, Hyeon-Cheol Kim
Journal of Endodontics.2022; 48(11): 1428. CrossRef
Effect of Autoclaving Cycles on the Cyclic Fatigue Resistance of Race and Race Evo Nickel-Titanium Endodontic Rotary Files: An In Vitro Study
Rahaf A. Almohareb, Reem Barakat, Aroob Albakri, Manal Altamimi
Metals.2021; 11(12): 1947. CrossRef
Effect of number of uses and sterilization on the instrumented area and resistance of reciprocating instruments
Victor de Ornelas Peraça, Samantha Rodrigues Xavier, Fabio de Almeida Gomes, Luciane Geanini Pena dos Santos, Erick Miranda Souza, Fernanda Geraldo Pappen
Restorative Dentistry & Endodontics.2021;[Epub] CrossRef
Influence of sterilization procedures on the physical and mechanical properties of rotating endodontic instruments: a systematic review and network meta-analysis
Mario Dioguardi, Claudia Arena, Diego Sovereto, Riccardo Aiuto, Luigi Laino, Gaetano Illuzzi, Enrica Laneve, Bruna Raddato, Vito Carlo Alberto Caponio, Antonio Dioguardi, Khrystyna Zhurakivska, Giuseppe Troiano, Lorenzo Lo Muzio
Frontiers in Bioscience-Landmark.2021;[Epub] CrossRef

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Original Article

Effect of cross-sectional area of 6 nickel-titanium rotary instruments on the fatigue fracture under cyclic flexural stress: A fractographic analysis: Soo-Youn Hwang, So-Ram Oh, Yoon Lee, Sang-Min Lim, Kee-Yeon Kum; J Korean Acad Conserv Dent 2009;34(5):424-429. Published online September 30, 2009; DOI: https://doi.org/10.5395/JKACD.2009.34.5.424

Abstract PDF PubReader ePub: This study aimed to assess the influence of different cross-sectional area on the cyclic fatigue fracture of Ni-Ti rotary files using a fatigue tester incorporating cyclical axial movement. Six brands of Ni-Ti rotary files (ISO 30 size with .04 taper) of 10 each were tested: Alpha system (KOMET), HeroShaper (MicroMega), K3 (SybronEndo), Mtwo (VDW), NRT (Mani), and ProFile (Dentsply). A fatigue-tester (Denbotix) was designed to allow cyclic tension and compressive stress on the tip of the instrument. Each file was mounted on a torque controlled motor (Aseptico) using a 1:20 reduction contra-angle and was rotated at 300 rpm with a continuous, 6 mm axial oscillating motion inside an artificial steel canal. The canal had a 60° angle and a 5 mm radius of curvature. Instrument fracture was visually detected and the time until fracture was recorded by a digital stop watch. The data were analyzed statistically. Fractographic analysis of all fractured surfaces was performed to determine the fracture modes using a scanning electron microscope. Cross-sectional area at 3 mm from the tip of 3 unused Ni-Ti instruments for each group was calculated using Image-Pro Plus (Imagej 1.34n, NIH). Results showed that NRT and ProFile had significantly longer time to fracture compared to the other groups (p < .05). The cross-sectional area was not significantly associated with fatigue resistance. Fractographycally, all fractured surfaces demonstrated a combination of ductile and brittle fracture. In conclusion, there was no significant relationship between fatigue resistance and the cross-sectional area of Ni-Ti instruments under experimental conditions.

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