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CC BY 4.0 · Eur J Dent 2024; 18(01): 104-108
DOI: 10.1055/s-0040-1721315
Original Article

Flexural Strength of an Indirect Composite Modified with Single-Wall Carbon Nanotubes

Pedro Rogério Camargos Pennisi
1   School of Dentistry, Federal University of Uberlândia, Uberlândia/MG, Brazil
,
Pedro Urquiza Jayme Silva
1   School of Dentistry, Federal University of Uberlândia, Uberlândia/MG, Brazil
,
Fábio Scorsolini Valverde
2   School of Dentistry, University Center - UNIFAE, São João da Boa Vista/Sao Paolo, Brazil
,
Ticiane Campos Clemente
2   School of Dentistry, University Center - UNIFAE, São João da Boa Vista/Sao Paolo, Brazil
,
Vitória Cerri
2   School of Dentistry, University Center - UNIFAE, São João da Boa Vista/Sao Paolo, Brazil
,
Maria Eduarda Biaco
2   School of Dentistry, University Center - UNIFAE, São João da Boa Vista/Sao Paolo, Brazil
,
Rebeca Garcia Rosa Ferreira
3   School of Physiotherapy, University Center - UNIFAE, São João da Boa Vista, Brazil
,
Luiz Renato Paranhos
1   School of Dentistry, Federal University of Uberlândia, Uberlândia/MG, Brazil
,
Eduardo Buozi Moffa
4   College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
› Author Affiliations Funding This study received its funding from the Coordination of Superior Level Staff Improvement, (finance code 001) and the National Council for Scientific and Technological Development.
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Abstract

Objectives The low resistance to fracture has limited the use of indirect composite resins for dental restorations, particularly in regions that are exposed to strong occlusal forces. To overcome this issue, different types of reinforcement for composites have been proposed, one of which is carbon nanotubes (CNTs). The aim of this study was to evaluate the flexural resistance of one commercial indirect composite resin (Sinfony, 3M/ESPE) after incorporation of single-wall carbon nanotubes (SWCNTs; Sigma–Aldrich, Inc., St. Louis, Missouri, United States) with or without the silanization form.

Materials and Methods Specimens of composite resin were fabricated in a Teflon mold. The composite resin was prepared according to the manufacturer’s instructions (n = 10 for each group), with SWCNTs in three concentrations.

Statistical Analysis The SWCNTs and SWCNT/SiO2-ATES specimens were evaluated by transmission electron microscopy, and a flexural test was conducted according to the ISO 4049/2009. Flexural strength data in MPa were submitted to one-way ANOVA following Tukey (p < 0.05).

Results The SWCNTs did not improve the flexural strength of indirect composite resin when compared with the control, independent of the concentration added (p > 0.05). However, when SWCNTs and SWCNTs/SiO2-ATES were compared, the SWCNTs/SiO2-ATES showed higher values than the three concentrations of SWCNTs (p < 0.05).

Conclusion The silanization process improves the SWCNTs strength proprieties, but the modification of chemical bonding between SWCNT and SWCNT/SiO2-ATES modified resins, in different concentrations, did not improve the composite resin flexural strength.

Keywords

carbon nanotubes - composite resins - flexural strength


Publication History

Article published online:
31 May 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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