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http://dx.doi.org/10.5395/rde.2020.45.e25

Influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium instruments: a systematic review  

Silva, Emmanuel Joao Nogueira Leal (Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO))
Zanon, Mayara (Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO))
Hecksher, Fernanda (Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO))
Belladonna, Felipe Goncalves (Department of Endodontics, School of Dentistry, Fluminense Federal University (UFF))
de Vasconcelos, Rafaela Andrade (Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO))
da Silva Fidalgo, Tatiana Kelly (Department of Preventive and Community Dentistry, School of Dentistry, State University of Rio de Janeiro (UERJ))
Publication Information
Restorative Dentistry and Endodontics / v.45, no.2, 2020 , pp. 25.1-25.12 More about this Journal
Abstract
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.
Keywords
Autoclave sterilization; Cyclic fatigue resistance; NiTi instruments; Systematic review;
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