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. 2024 Feb;18(1):104-108.
doi: 10.1055/s-0040-1721315. Epub 2021 May 31.

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

Pedro Rogério Camargos Pennisi  1 , Pedro Urquiza Jayme Silva  1 , Fábio Scorsolini Valverde  2 , Ticiane Campos Clemente  2 , Vitória Cerri  2 , Maria Eduarda Biaco  2 , Rebeca Garcia Rosa Ferreira  3 , Luiz Renato Paranhos  1 , Eduardo Buozi Moffa  4
Affiliations

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

Pedro Rogério Camargos Pennisi et al. Eur J Dent. 2024 Feb.

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.

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Conflict of interest statement

None declared.

Figures

Fig. 1
Fig. 1
Allocation process flow chart.
Fig. 2
Fig. 2
Transmission electron microscopyimage of original single-wall carbon nanotubes. Arrows show the presence of impurities, mainly amorphous carbon and metal nanoparticles.
Fig. 3
Fig. 3
Transmission electron microscopy image of SWCNTs after silanization (SWCNTs/SiO 2 -ATES). The nanotubes appear scattered and the arrows show the growth of nano-particles of silicon oxides adhered to their surfaces. SWCNT, single-wall carbon nanotubes.
See this image and copyright information in PMC

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