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3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli

1
Endodontic Clinical Section, Department of Biomedical and Neuromotor Sciences, School of Dentistry, University of Bologna-Alma Mater Studiorum, 40125 Bologna, Italy
2
Postgraduate Program in Dentistry, University of Taubaté (UNITAU), Taubaté, São Paulo 12020-270, Brazil
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Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University—UNESP, São Paulo 12245-000, Brazil
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Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, 80125 Naples, Italy
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Center for Advanced Biomaterials for [email protected], Istituto Italiano di Tecnologia, 80125 Naples, Italy
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School of Dentistry, University of Naples Federico II, 80131 Naples, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Luca Testarelli
Appl. Sci. 2021, 11(6), 2547; https://doi.org/10.3390/app11062547
Received: 10 February 2021 / Revised: 5 March 2021 / Accepted: 8 March 2021 / Published: 12 March 2021
(This article belongs to the Special Issue Innovative Techniques in Endodontics)
The aim of the present investigation was to calculate the stress distribution generated in the root dentine canal during mechanical rotation of five different NiTi endodontic instruments by means of a finite element analysis (FEA). Two conventional alloy NiTi instruments F360 25/04 and F6 Skytaper 25/06, in comparison to three heat treated alloys NiTI Hyflex CM 25/04, Protaper Next 25/06 and One Curve 25/06 were considered and analyzed. The instruments’ flexibility (reaction force) and geometrical features (cross section, conicity) were previously investigated. For each instrument, dentine root canals with two different elastic moduli(18 and 42 GPa) were simulated with defined apical ratios. Ten different CAD instrument models were created and their mechanical behaviors were analyzed by a 3D-FEA. Static structural analyses were performed with a non-failure condition, since a linear elastic behavior was assumed for all components. All the instruments generated a stress area concentration in correspondence to the root canal curvature at approx. 7 mm from the apex. The maximum values were found when instruments were analyzed in the highest elastic modulus dentine canal. Strain and von Mises stress patterns showed a higher concentration in the first part of curved radius of all the instruments. Conventional Ni-Ti endodontic instruments demonstrated higher stress magnitudes, regardless of the conicity of 4% and 6%, and they showed the highest von Mises stress values in sound, as well as in mineralized dentine canals. Heat-treated endodontic instruments with higher flexibility values showed a reduced stress concentration map. Hyflex CM 25/04 displayed the lowest von Mises stress values of, respectively, 35.73 and 44.30 GPa for sound and mineralized dentine. The mechanical behavior of all rotary endodontic instruments was influenced by the different elastic moduli and by the dentine canal rigidity. View Full-Text
Keywords: computer-aided design; finite element analysis; nickel–titanium alloys; endodontic treatment computer-aided design; finite element analysis; nickel–titanium alloys; endodontic treatment
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MDPI and ACS Style

Prati, C.; Tribst, J.P.M.; Dal Piva, A.M.d.O.; Borges, A.L.S.; Ventre, M.; Zamparini, F.; Ausiello, P. 3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli. Appl. Sci. 2021, 11, 2547. https://doi.org/10.3390/app11062547

AMA Style

Prati C, Tribst JPM, Dal Piva AMdO, Borges ALS, Ventre M, Zamparini F, Ausiello P. 3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli. Applied Sciences. 2021; 11(6):2547. https://doi.org/10.3390/app11062547

Chicago/Turabian Style

Prati, Carlo, João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Alexandre Luiz Souto Borges, Maurizio Ventre, Fausto Zamparini, and Pietro Ausiello. 2021. "3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli" Applied Sciences 11, no. 6: 2547. https://doi.org/10.3390/app11062547

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