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Does the type of endodontic access influence in the cyclic fatigue resistance of reciprocating instruments?

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Abstract

Introduction

The aim of the present study was to compare the cyclic fatigue resistance of Reciproc R25 (R25) and Reciproc Blue R25 (R25B) instruments, after simulated clinical use in traditional (TradAC) and ultraconservative (UltraAC) endodontic access cavities.

Methods

Forty mandibular molars were randomly assigned into the following groups, according to the type of access and instrument to be used: TradAC and R25, TradAC and R25B, UltraAC and R25, and UltraAC and R25B. Teeth were accessed accordingly, and the root canals were prepared using “RECIPROC ALL” kinematics. The cyclic fatigue resistance of the forty used instruments was obtained measuring the time to fracture in an artificial stainless-steel canal. Ten brand new R25 and R25B were used as control groups. The fracture surfaces and the side cutting edges of the instruments were examined with a scanning electron microscope. Data were statistically analyzed using one-way ANOVA and post hoc Tukey tests with a significance level of P < 0.05.

Results

R25B instruments showed significantly higher cyclic fatigue resistance than R25, regardless of the access cavity type (P < 0.05). No differences were observed in the cyclic fatigue resistance between instruments without simulated clinical use and used in TradAC (P > 0.05). R25 and R25B used in UltraAC showed significantly lower cyclic fatigue resistance compared with the instruments used in TradAC and without simulated clinical use (P < 0.05).

Conclusions

R25B files showed improved cyclic fatigue resistance than R25. The use of R25B and R25 files in mandibular molars with UltraACs decreased their cyclic fatigue resistance, compared with TradAC.

Clinical relevance

The use of Reciproc and Reciproc Blue files in mandibular molars with ultra-conservative endodontic access cavities reduced their cyclic fatigue resistance. Clinicians should be aware about the reduced cyclic fatigue resistance of these files when used in mandibular molars with UltraAC, due to the synergistic effect of access angulation and severe curvature induced in the endodontic files.

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Funding

This study was partially founded by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ).

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Authors and Affiliations

  1. Endodontics Department, Grande Rio University (UNIGRANRIO), Rua Herotides de Oliveira, 61/902, Icaraí, Niterói, Rio de Janeiro, 24220-000, Brazil

    Emmanuel João Nogueira Leal Silva, Rafael Santos Attademo, Marcia Cristina Dutra da Silva, Henrique dos Santos Antunes & Victor Talarico Leal Vieira

  2. Endodontics Department, Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil

    Karem Paula Pinto

Authors
  1. Emmanuel João Nogueira Leal Silva
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  2. Rafael Santos Attademo
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  3. Marcia Cristina Dutra da Silva
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  4. Karem Paula Pinto
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  5. Henrique dos Santos Antunes
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  6. Victor Talarico Leal Vieira
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Contributions

Emmanuel João Nogueira Leal Silva contributed to idea, to hypothesis, and to final approval of the version to be published. Rafael Santos Attademo and Marcia Cristina Dutra da Silva contributed to the experimental design. Karem Paula Pinto, Henrique dos Santos Antunes, and Victor Talarico Leal Vieira contributed to the experimental design, to analysis, and interpretation of data. All authors read and approved the final manuscript.

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Correspondence to Emmanuel João Nogueira Leal Silva.

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Silva, E.J.N.L., Attademo, R.S., da Silva, M.C.D. et al. Does the type of endodontic access influence in the cyclic fatigue resistance of reciprocating instruments?. Clin Oral Invest 25, 3691–3698 (2021). https://doi.org/10.1007/s00784-020-03694-7

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